Accelerator composition for the cure of polyfunctional isocyanates with epoxy resins
View Patent ↗The present disclosure is related to an accelerator composition for the cure of polyfunctional isocyanates with epoxy resins comprising (a) a boron trihalide-amine complex, and (b) a quaternary ammonium or phosphonium halide as well as the use of such accelerator composition, cured isocyanate-epoxy resin products obtainable therefrom and a method of making a cured isocyanate-epoxy resin product.
1. An accelerator composition for curing polyfunctional isocyanates with epoxy resins comprising
(a) a boron trichloride-amine complex, and
(b) a quaternary phosphonium halide.
2. The composition according to claim 1 , wherein component (a) is a boron trichloride-dimethyloctylamine complex, boron trichloride-trimethylamine complex, boron trichloride-benzyldimethylamine complex or mixtures thereof.
3. The composition according to claim 1 , wherein component (b) is a quaternary or phosphonium bromide or chloride.
4. The composition according to claim 3 , wherein component (b) is tetrabutylphosphonium chloride, tetrabutylphosphonium bromide or mixtures thereof.
5. The composition according to claim 1 , wherein the weight ratio of component (a) to component (b) is in the range from about 50:1 to 1:1.
6. The composition according to claim 5 , wherein the weight ratio of component (a) to component (b) is about 20:1 to 5:1.
7. An accelerator composition for curing polyfunctional isocyanates with epoxy resins comprising
(a) a boron trihalide-amine complex, and
(b) a quaternary ammonium or phosphonium halide and wherein the weight ratio of component (a) to component (b) is about 20:1 to 5:1.
8. The composition according to claim 7 , wherein component (a) is a boron trichloride-dimethyloctylamine complex, boron trichloride-trimethylamine complex, boron trichloride-benzyldimethylamine complex or mixtures thereof.
9. The composition according to claim 7 , wherein component (b) is a quaternary ammonium or phosphonium bromide or chloride.
10. The composition according to claim 9 , wherein component (b) is benzyltriethylammoniumchloride, tetrabutylammoniumchloride, tetrabutylammonium bromide, tetrabutylphosphonium chloride tetrabutylphosphonium bromide or mixtures thereof.