A method for making an aqueous polyurethane-vinyl polymer dispersion which comprises:
(a) forming a carboxy-containing, water-dispersible, isocyanate terminated polyurethane prepolymer,
(b) adding a vinyl monomer composition which includes a polyethylenically unsaturated monomer to the prepolymer to form a prepolymer/monomer mixture,
(c) adding a tertiary amine to the prepolymer/monomer mixture,
(d) dispersing the prepolymer/monomer mixture in water,
(e) adding an oil soluble free radical initiator and a chain-extender to the aqueous dispersion, and
(f) polymerizing the vinyl monomer and completing chain extension of the prepolymer by heating the aqueous dispersion.
一种制造
水性聚
氨酯-
乙烯基聚合物分散体的方法,包括
(a) 形成一种含羧基、可在
水中分散的
异氰酸酯端聚
氨酯预聚物、
(b) 向预聚物中加入
乙烯基单体组合物,其中包括聚
乙烯不饱和单体,形成预聚 物/单体混合物、
(c) 向预聚物/单体混合物中加入叔胺、
(d) 将预聚物/单体混合物分散在
水中、
(e) 在
水分散液中加入油溶性自由基
引发剂和扩链剂,以及
(f) 通过加热
水分散液,使
乙烯基单体聚合并完成预聚物的扩链。