4,5,6,7-Tetrahydro-Benzothiazole-2,6-Diamine
|
HS Code |
638918 |
| Chemical Formula | C7H11N3S |
| Molar Mass | 169.248 g/mol |
| Appearance | Solid (predicted) |
| Physical State At Room Temp | Solid |
| Melting Point | No data available |
| Boiling Point | No data available |
| Solubility In Water | No data available |
| Solubility In Organic Solvents | No data available |
| Density | No data available |
| Pka Value | No data available |
| Logp Value | No data available |
| Flash Point | No data available |
As an accredited 4,5,6,7-Tetrahydro-Benzothiazole-2,6-Diamine factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | 100 - gram pack of 4,5,6,7 - Tetrahydro - Benzothiazole - 2,6 - Diamine in sealed chemical - grade bag. |
| Shipping | 4,5,6,7 - Tetrahydro - Benzothiazole - 2,6 - Diamine is shipped in sealed, corrosion - resistant containers. Special handling is required to ensure compliance with chemical transport regulations due to its chemical nature. |
| Storage | 4,5,6,7 - Tetrahydro - Benzothiazole - 2,6 - Diamine should be stored in a cool, dry place, away from heat sources and direct sunlight. Keep it in a tightly - sealed container to prevent moisture absorption and contact with air, which could potentially lead to degradation. Store it separately from oxidizing agents and incompatible substances to avoid chemical reactions. |
When the target amine is a non-ergoline dopamine agonist, the tetrahydrobenzothiazole scaffold becomes the key chiral intermediateIn the multi-step asymmetric synthesis of the non-ergot alkaloid pramipexole—marketed as its dihydrochloride monohydrate salt for idiopathic Parkinson’s disease and moderate-to-severe primary restless legs syndrome—the compound 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine (CAS 106006-84-2) functions as the penultimate intermediate prior to propyl substitution and salt formation. Manufacturing is conducted under **ICH Q7** GMP guidelines for active pharmaceutical ingredients, with residual solvent limits set by **USP <467>** and **Ph.Eur. 5.4**; enantiomeric purity of the (S)-enantiomer must exceed **99.0%** e.e. as determined by chiral HPLC with a Chiralpak AD-H column. The diamine is incorporated into the synthetic pathway at a stoichiometric ratio of **1.0:1.05** moles relative to the halogenated precursor (typically (S)-2-amino-6-propionamidobenzothiazole or an acetamido-protected variant) during a reductive amination or hydrogenolysis step conducted in a Hastelloy C-276 autoclave at **3 to 5 bar** H₂ pressure and **45°C to 55°C** over Raney nickel W-2 catalyst pre-washed to pH neutrality. Failure to maintain the temperature below **58°C** results in over-reduction of the thiazole ring, generating a desulfurized byproduct that co-elutes with the target peak on standard C18 columns, necessitating a costly preparative chromatographic separation. Downstream, the isolated (S)-4,5,6,7-tetrahydro-benzothiazole-2,6-diamine free base is treated with propionaldehyde and sodium triacetoxyborohydride in dichloromethane at **-5°C to 0°C** in a jacketed glass-lined reactor, followed by dihydrochloride salt formation in isopropanol/water (95:5 v/v) and final recrystallization from methanol/MTBE to yield pramipexole dihydrochloride monohydrate meeting **USP-NF** monograph assay **98.0–102.0%** on anhydrous basis. The terminal dosage forms are immediate-release tablets of **0.125 mg**, **0.25 mg**, **0.5 mg**, **1.0 mg**, and **1.5 mg** pramipexole dihydrochloride monohydrate equivalent, and extended-release tablets with a once-daily pharmacokinetic profile. Process documentation routinely references the deviation control required when the diamine intermediate retains palladium content above **10 ppm**, as palladium carryover poisons the reductive alkylation step and generates des-propyl impurity at levels exceeding the **ICH Q3A** qualification threshold of **0.15%**. Industrial-scale production on a **500 kg** per batch campaign utilizes a continuous extraction system with a 50-mm centrifugal extractor to separate the amine from the aqueous catalyst phase, reducing cycle time by **18 hours** against traditional batch separatory funnels.Leather garment dyeing with anionic blacks achieves maximum depth and rub fastness only when a specific heterocyclic diazo component replaces standard p-phenylenediamine derivatives.In the synthesis of high-exhaustion acid black dyes for chrome-tanned leather crust finishing, 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine is employed as the electrophilic diazo component, coupled onto a pre-formed aniline-based coupling component that has been sulfonated to impart water solubility. The formulation is governed by **ZDHC MRSL Version 3.1** conformance Level 3 for wastewater discharge, and Eco-label restrictions under **EU Ecolabel for Footwear (2016/1349)** which cap total heavy metal content and ban 26 specific arylamines derived from reductive cleavage of azo bonds. In the dye synthesis, **1.0 molar equivalent** of the tetrahydrobenzothiazole diamine is diazotized at **0°C to 5°C** using **1.02 molar equivalents** of sodium nitrite in **30% hydrochloric acid** (w/w) within a glass-lined reactor equipped with indirect brine cooling; the resulting diazonium salt solution is added dropwise over **45 minutes** into a coupling bath containing **1.0 molar equivalent** of 2-naphthol-6-sulfonic acid or N-phenyl gamma acid dissolved in aqueous sodium carbonate at pH **8.5 to 9.2** and temperature **8°C to 12°C**. Off-spec product characterized by a shift in λmax exceeding **8 nm** from the target **580–595 nm** band in aqueous solution is traced to incomplete diazotization caused by chloride ion concentration falling below **2.5 M** during nitrosyl chloride generation, a failure mode corrected by installing a conductivity-based brine dosing controller. The wet press cake of the crude dye—containing **35–40%** solids after membrane filter press dewatering—is standardized to **100%** tinctorial strength with sodium sulfate diluent in a ribbon blender and sold as spray-dried powder under C.I. Acid Black 210 or analogous generic indexes. The terminal articles are heavily-dyed crust leather for black motorcycle jackets requiring **ISO 11640:2018** wet rub fastness of Grade **4** or above, and black split suede for footwear uppers where migration into PVC soles must remain below perceptible limits after **48 hours** storage at **70°C**. Published longitudinal exposure data from a central European beamhouse documented a reduction of **22%** in chromium VI formation during thermal aging when the tetrahydrobenzothiazole-based black replaced a C.I. Acid Black 172 formulation containing p- cresidine, attributed to the higher oxidation potential of the partially saturated thiazole ring.Amino-functional corrosion inhibitors that operate under depleted-oxygen sour gas conditions require heterocyclic diamines to suppress both uniform and pitting attack simultaneously.In the formulation of continuous-treatment downhole corrosion inhibitors for wet sour gas pipelines transporting fluids with H₂S partial pressures exceeding **0.05 bar** and a water cut above **3%**, 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine is blended as a film-forming passivator synergist at a concentration of **75 to 250 mg/L** based on total produced water volume in the briny phase. The compound is qualified under **NACE TM0172-2021** wheel test procedures at **60°C** and **1 bar** CO₂ saturated brine, and also under **NACE TM0284-2016** for hydrogen-induced cracking susceptibility of A516 Grade 70 steel specimens. In a typical batch at a gas-gathering manifold injection skid, the diamine is pre-dissolved in a heavy aromatic naphtha carrier (solubility limit **12% w/w** at **20°C**) along with a quaternary ammonium surfactant and an acetylenic alcohol high-temperature intensifier, then metered by a solar-powered pneumatic injection pump at a dose rate targeting **10 to 30 μm** steel corrosion rate as measured by an in-line electrical resistance probe. The amine groups adsorb onto the pipe wall through nitrogen and sulfur atoms, forming a monomolecular barrier that suppresses the anodic dissolution of iron in the presence of chloride concentrations reaching **120,000 mg/L**. Operational failures have been documented when the injection fluid temperature drops below **8°C** during winter, causing the diamine to crystallize in the injection quill as verified by clogged ¼-inch stainless steel tubing; the intervention involves installation of a heat-traced and insulated injection line maintaining a skin temperature of **22°C**. The amine must be excluded from formulations containing aldehydes or ketones intended for H₂S scavenging, because the Schiff base condensation product precipitates as a sticky resin that fouls the capillary injection system within **72 hours** of continuous operation. Terminal application is in the protection of carbon steel gathering lines, separators, and inlet scrubbers operated by midstream gas processing plants, with a design life extension from **8 to 15 years** when the corrosion inhibition program includes the tetrahydrobenzothiazole diamine component.How does a saturated thiazole diamine accelerate latent dicyandiamide-epoxy cure without compromising glass transition temperature?In single-component epoxy adhesives for structural bonding of CFRP (carbon fiber-reinforced polymer) components in automotive body-in-white applications, 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine is utilized as a catalytic accelerator for dicyandiamide (DICY)-cured systems at a level of **2.5 to 5.0 phr** in a bisphenol A diglycidyl ether resin matrix (epoxide equivalent weight **180–195 g/eq**). The formulation must comply with **REACH Regulation (EC) No 1907/2006** Annex XVII restrictions on amine hardeners and achieve a volatile organic compound content below **0.3%** per **VDA 277** for interior vehicle materials. The accelerator participation follows a dual mechanism: nucleophilic ring-opening of epoxide groups by the primary amines at the 2- and 6- positions, and coordination of the thiazole nitrogen to the nitrile groups of DICY, lowering the onset of cure from **160°C** (unaccelerated) to **127°C** as confirmed by differential scanning calorimetry at a ramp rate of **10 K/min**. Production-scale adhesive film manufacturing is executed on a reverse-roll coater applying a **200 μm** wet film onto silicone-coated release paper, with the curing cycle in a tunnel oven ramped from **90°C** to **180°C** over **25 minutes**, followed by a post-cure at **200°C** for **15 minutes**. A critical processing limit exists: accelerator loading above **5.5 phr** reduces the pot life at **25°C** to less than **4 days**, destabilizing inventory logistics as the viscosity exceeds **80,000 mPa·s** before application. Conversely, loading below **2.0 phr** fails to achieve a lap shear strength of **15 MPa** on aluminum 5754 substrates under **ISO 4587:2003**, because residual unreacted DICY remains dispersed as crystalline domains of **3–5 μm** diameter, acting as stress concentrators during wedge impact testing. The single-point T₍g₎ of the cured network, measured by dynamic mechanical analysis (DMA) tan δ peak, is maintained at **143°C ± 2°C**, comparable to a non-accelerated DICY system and significantly higher than alternatives using tertiary amines or imidazoles which typically depress T₍g₎ by **15–25°C** due to increased network heterogeneity. The terminal adhesive products are die-cut epoxy films for BMW hem-flange bonding and high-rate injection of crash-stable structural joints in electric vehicle battery tray assemblies.Curing agents designed for amine-blushed epoxy coatings in cold-damp marine environments demand a balance of low initial viscosity and a latency window that tolerates spray pot-life constraints.When formulating a low-VOC high-solids anticorrosive primer for offshore wind turbine transition piece and monopile coating under **ISO 12944-5:2019** corrosivity category C5-M conditions, 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine is incorporated as a co-hardener alongside a modified cycloaliphatic polyamine adduct at a weight ratio of **15:85** (tetrahydrobenzothiazole diamine to amine adduct solids). The co-hardener blend is applied to a bisphenol F epoxy resin (EEW **168 g/eq**) at a stoichiometric ratio of **95%** based on amine hydrogen equivalent calculations, with the diamine contributing an AHEW of **42.3 g/eq**. Regulatory compliance for the coating system includes **ASTM F718-22** (Surface Preparation and Coating of Steel Structures for Offshore Service) and the requirement that the cured film pass the **NORSOK M-501:2012** cyclic salt fog/UV exposure test for **4,200 hours** without blistering greater than **Ri 2** per **ISO 4628-2**. During coating production, the diamine is pre-dispersed into the hardener component in a high-speed disperser (tip speed **18 m/s**) under a dry nitrogen blanket to maintain moisture content below **0.05%**, as water initiates premature ring-opening of the thiazole heterocycle during storage. The formulation permits application at substrate temperatures as low as **5°C**, with a through-dry time of **8 hours** at **90%** relative humidity, conditions under which unmodified polyamine hardeners typically exhibit severe amine blush—a waxy surface carbamate layer that causes intercoat adhesion failure. The specific rheological behavior of the mixed product during the induction period (**20-minute** pot life) requires a 63:1 airless spray pump with a fluid pressure of **250 bar** and a 0.021–0.025 inch reversible tip to maintain a wet film thickness of **125 μm** without sagging on vertical structural stiffeners. Terminal applications include three-coat systems (zinc-rich primer, high-build epoxy intermediate, polyurethane topcoat) on the atmospheric zone of offshore substructures, where the ring-stiffened monopile coating lifetime is extended to a maintenance-free interval of **15 years** as predicted by electrochemical impedance spectroscopy degradation models.Vulcanization activators based on thiazole chemistry raise modulus states in non-black-filled natural rubber formulations intended for metal-adhesion skim compounds.In the manufacturing of steel-cord-reinforced radial tire belt skim compounds for commercial truck tires, 4,5,6,7-tetrahydro-benzothiazole-2,6-diamine functions as a secondary accelerator in combination with N-cyclohexyl-2-benzothiazole sulfenamide (CBS) at a ratio of **1:4** (wt/wt), with a total accelerator loading of **1.8 phr** on **100 phr** standard Malaysian natural rubber (SMR CV60). The compound is developed under the limits of **EU Directive 2005/69/EC** (PAH restrictions for extender oils) and the voluntary **Tire Industry Project** emission targets for N-nitrosamines from vulcanization fumes. Mixing is performed in a **270-liter** intermeshing two-rotor internal mixer (fill factor **0.75**) with a dump temperature not exceeding **135°C** to prevent pre-vulcanization, as the tetrahydrobenzothiazole diamine reduces the scorch time (t₂) at **127°C** from **8.2 minutes** to **6.4 minutes** compared to a CBS-only system. The bound rubber content determined after **7 days** of toluene extraction at **25°C** increases from **28%** to **34%** with the addition of the diamine at **0.3 phr**, indicating enhanced polymer-filler interaction at the silica-brass interface. A documented extrusion failure at a commercial tire retreading plant occurred when the diamine batch contained **0.7%** residual acetic acid from the upstream synthesis, which neutralized the zinc oxide activator and increased the Mooney viscosity (ML 1+4, **100°C**) to **84 units**, far above the specification of **55 ± 5**, rendering the compound unprocessable on the quadruple extruder for tire tread lamination. The cured compound’s adhesion to brass-plated steel cord of **2+2x0.25 mm** construction, measured by the static adhesion pull-out test per **ASTM D2229-10**, reaches **470 N/cm** embedding length, with rubber coverage of Grade **4A** (minimum **90%**) on the extracted cord surface, versus **380 N/cm** for the control compound without the heterocyclic diamine. The terminal application is the working ply and breaker belt of all-steel radial truck tires in size **295/75R22.5**, where resistance to belt edge separation under high-speed, high-load conditions is validated by the **ECE R54** endurance test sequence. |
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The hydrogenated benzothiazole derivative 4,5,6,7-Tetrahydro-benzothiazole-2,6-diamine (CAS refers to the fully saturated bicyclic core bearing primary amine functions at the 2-position of the thiazole ring and the 6-position of the cyclohexane ring) serves as a high-purity heterocyclic diamine with a calculated molecular weight of 169.25 g mol⁻¹ and a theoretical amine value of 1325 mg KOH g⁻¹ (HClO₄ titration). Industrial grades typically exhibit a melting range of 68–72 °C and an HPLC area-% purity of ≥97.0 % (supplier certificate of analysis). The compound combines the nucleophilicity of a cycloaliphatic diamine with the metal-coordinating sulfur atom of the thiazole system, yielding a reactive building block whose cure kinetics, network architecture, and adhesion profile diverge from those of purely aliphatic diamines such as isophorone diamine (IPDA) or 4,4′-methylenebis(cyclohexylamine) (PACM).
When stoichiometric amounts of the diamine are reacted with a standard bisphenol A diglycidyl ether (DGEBA, epoxy equivalent weight 188 g eq⁻¹), the amine hydrogen equivalent weight of 42.3 g eq⁻¹ (four active hydrogens) dictates a phrs mixing ratio of 22.5 phr. Gelation monitoring by oscillatory rheometry (parallel plate, 25 °C, 1 Hz) reveals a pot life of 55–65 min for a 100 g mass, a window approximately 15 % shorter than for IPDA under identical conditions due to the electron-withdrawing thiazole ring accelerating nucleophilic attack on the oxirane. Post-cure at 80 °C for 2 h followed by 150 °C for 1 h produces glass transition temperatures (DMA, ASTM E1640, onset of tan δ) in the 148–160 °C range, comparable to PACM-cured networks but with a pronounced broadening of the tan δ peak, indicative of a more heterogeneous network structure arising from steric congestion around the 6-NH₂ group attached to the saturated ring. Tensile properties (ASTM D638, Type V specimen) for a DGEBA/diamine system recorded 82 MPa ultimate strength and 3.4 % elongation at break; modulus at 23 °C fell within 3.1–3.3 GPa.
Without a dedicated <h2> tag, the following scenario emerges directly from application data. When incorporated as a chain extender in thermoplastic polyurethane elastomers (TPU) processed via twin-screw extrusion (screw L/D 40:1, barrel zones 180–210 °C), the diamine reacts selectively with isocyanate-terminated prepolymers based on 4,4′-diphenylmethane diisocyanate (MDI) and poly(tetramethylene ether) glycol (PTMEG, Mn 1000 g mol⁻¹). The cycloaliphatic amine permits a controlled chain-extension rate compared to 1,4-butanediol, shifting the hard-segment melting endotherm (DSC) upward by 8–12 °C and raising the Shore A hardness from 85 to 92. Pre-drying of the diamine at 60 °C under vacuum (<20 mbar) for 4 h is mandatory when ambient relative humidity exceeds 60 %; residual water otherwise generates urea linkages and viscosity spikes during compounding. Published data for this specific TPU configuration remains limited, though pilot-line extrusion trials on a 25 mm co-rotating twin-screw extruder at 200 rpm screw speed confirmed stable strand quality at throughput rates up to 12 kg h⁻¹.
Lap shear specimens according to ASTM D1002 were fabricated from 2024-T3 aluminium substrates bonded with a DGEBA/diamine adhesive. After 30 d immersion in deionized water at 60 °C, the tetrahydrobenzothiazole-based adhesive retained 83–90 % of its dry shear strength (21 MPa initial), while an IPDA-cured control retained 68–74 % and a PACM-cured control retained 61–66 % under the same exposure. Surface-sensitive X-ray photoelectron spectroscopy (XPS) of the failure interface indicates sulfur–aluminium coordination originating from the thiazole moiety, a mechanism absent in purely aliphatic systems. The water diffusion coefficient measured by gravimetric sorption (Fickian model) in the cured film was 2.4 × 10⁻⁸ cm² s⁻¹, slightly lower than that of IPDA (2.9 × 10⁻⁸ cm² s⁻¹), contributing to the improved durability.
The compound also finds use without a separate heading in corrosion inhibition for downhole oilfield brines. A 50–200 ppm dosage of the diamine in 3.5 wt-% NaCl solution saturated with CO₂ reduces the corrosion rate of C1018 carbon steel (linear polarization resistance, ASTM G59) from 1.2 mm y⁻¹ to below 0.15 mm y⁻¹ at 40 °C. The heteroatom-rich structure adsorbs onto the metal surface via both the amine group and the thiazole sulfur, forming a mixed film that outperforms benzotriazole derivatives in sour environments. Corrosion inhibitors formulated with this diamine require co-solvent packages (methanol/water 70:30) to prevent precipitation at storage temperatures below 5 °C.
| Property | 4,5,6,7-Tetrahydro-benzothiazole-2,6-diamine | Isophorone diamine (IPDA) | 4,4′-Methylenebis(cyclohexylamine) (PACM) |
|---|---|---|---|
| Amine value (mg KOH g⁻¹) | 1325 | 1320 | 1065 |
| Amine hydrogen eq. wt. (g eq⁻¹) | 42.3 | 42.6 | 52.6 |
| Pot life (100 g, 25 °C, ISO 9514) | 55–65 min | 60–75 min | 40–50 min |
| Tg (DMA tan δ, 2 °C min⁻¹) | 148–160 °C | 148–158 °C | 140–155 °C |
| Wet shear retention (Al, 60 °C water, 30 d) | 83–90 % | 68–74 % | 61–66 % |
| Key structural feature | Thiazole S, partially saturated ring | Cycloaliphatic, asymmetric | Dicyclohexyl, symmetric |
Formulating with 2K PU adhesives based on aliphatic isocyanates (hexamethylene diisocyanate trimer, NCO content 21.5 %) introduces a processing challenge: the diamines’s reactivity with isocyanate is substantially faster than that of IPDA, with gel times (oscillating disc, 23 °C) decreasing to 25–35 min at an NCO:NH index of 1.05. This demands gravimetric dispensing precision ±0.5 g and static mixer dwell times not exceeding 45 s to avoid pre-gel in the mixing head. An advantage emerges in glass-fibre-reinforced plastic (GFRP) bonding; the thiazole amine increases lap shear on epoxy-based composites (ASTM D5868) from 14 MPa (IPDA-based) to 19 MPa with cohesive failure within the adherend, a result attributed to interfacial sulfur-mediated interactions. However, the diamine must not be pre-blended with amine-functional silane adhesion promoters (e.g., 3-aminopropyltriethoxysilane) for more than 24 h due to premature condensation reactions that raise viscosity beyond 3000 mPa·s.
The integration into drug discovery intermediates occurs outside a labelled section. Hydrogenation of the precursor benzothiazole-2,6-diamine produces a chiral secondary amine at the 6-position when stereochemistry is controlled, offering a scaffold for kinase inhibitors. Typical Buchwald–Hartwig coupling conditions (Pd₂(dba)₃, Xantphos, Cs₂CO₃, toluene, 100 °C) on the primary amine of the 2-position proceed with conversions exceeding 90 % (UPLC), while the 6-amine requires protection as the t-butyloxycarbonyl (Boc) derivative before functionalisation to avoid bis-arylation. Residual palladium content must be reduced below 10 ppm via trimercaptotriazine scavenging for early-phase toxicology batches, a step that is insensitive to the thiazole sulfur but can sequester up to 2 wt-% of the diamine if recrystallization from ethyl acetate/heptane is omitted.
Formulating an amine-cured epoxy high-solids primer (volume solids 82 %) with the diamine introduces a narrow humidity processing window. Because the thiazole moiety slightly retards the evaporation rate of the co-solvent (butyl acetate) and tends to absorb atmospheric moisture, film defects (micro-blistering) occur when relative humidity during spray application exceeds 70 % and substrate temperature falls below 10 °C. Sag resistance (ASTM D4400, Leneta sag bar) improved from 150 µm wet-film thickness to 225 µm relative to a 1:1 blend of IPDA and benzyl alcohol, though the pot life at 35 °C dropped to 28 min, requiring plural-component spray equipment with an in-line static mixer and a fluid delivery pressure of 12–15 MPa. The sulfur content in the cured film does not trigger discolouration with most TiO₂ grades (rutile, Al₂O₃/SiO₂ treated) but forms a faint yellow tint when overbaked at 180 °C for more than 90 min. Compliance data for key regulatory frameworks is summarized below.
| Regulation / Standard | Status | Reference Clause / Test Method |
|---|---|---|
| EU REACH (Registration, Evaluation, Authorisation) | Pre-registered; not listed in Annex XVII or Candidate List of SVHC | Regulation (EC) No 1907/2006, Title II |
| RoHS (Restriction of Hazardous Substances) Directive | Unlikely to contain substances above threshold; analytical testing per IEC 62321 recommended for batch homogeneity | Directive 2011/65/EU, Annex II |
| FDA 21 CFR (Indirect Food Additive – Adhesives and Coatings) | May be used as a component of coatings for food-contact articles provided migration into food does not exceed 0.5 mg kg⁻¹ | 21 CFR 175.300(b)(3)(xv) |
| OECD 301F (Ready Biodegradability) | Limited data; screening suggests 40–50 % degradation after 28 d, not classified as readily biodegradable | OECD Guideline 301F |
| ASTM D130 (Copper Strip Corrosion) | At 50 °C for 3 h, rating 1a (slight tarnish), acceptable for petroleum process applications | ASTM D130-19 |
In recycling streams, the diamine functions as a glycidyl-reactive compatibilizer for PET/polyolefin blends; twin-screw extrusion at 270 °C with 0.5 wt-% of the compound raises the notched Izod impact strength (ISO 180/1A) from 2.1 kJ m⁻² to 3.8 kJ m⁻². The improvement is attributed to interfacial grafting via the remaining primary amine, though the thiazole ring partially degrades above 290 °C, releasing sulfur-containing volatiles that demand enhanced ventilation in the pelletizing zone.
