| 摘要 |
<p>A process is provided for making novel chloropreneunsaturated carboxylic acid copolymer latexes having tackifying resin intimately dispersed therein, the latexes having characteristics making them especially suitable for use in nonsolvent adhesives. The process includes the steps of (1) preparing a water-immiscible solution containing the chloroprene monomer, an alpha,beta-unsaturated carboxylic acid monomer, and a tackifying resin, (2) emulsifying this solution in water containing polyvinyl alcohol, and (3) copolymerizing the monomers in the emulsion so formed; the chloroprene-carboxylic acid mixture of step (1) containing 0.4-10 mole percent of the carboxylic acid based on the total of chloroprene plus carboxylic acid and the tackifying resin being present in said mixture in the proportion of 5-75 parts, and the polyvinyl alcohol (PVA) being present in step(2) in the proportion of 2-10 parts, all of said proportions being by weight per 100 parts of total chloroprene plus carboxylic acid monomer.</p> |
