| 摘要 |
This invention is directed to an improved process for preparing coating or adhesive compositions useful in bonding expanded vinyl which is vacuum laminated to molded fiberboard substrates, comprising (1) mixing an aqueous dispersion of an addition polymer containing active hydrogen, wherein the addition polymer contains essentially no polyurethane functional moieties, with water emulsifiable difunctional and/or multi-functional isocyanate, and (2) subsequently adding to the mixture an aqueous dispersion of a polyurethane polymer. Adhesive compositions prepared using the process exhibit both superior shear strength and superior hot peel strength at elevated temperatures.
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