| 摘要 |
<p>A method to produce in ethyl alcohol, polyvinyl acetate, partially hydrolized in acid or basic surroundings, preferably with hydrolysis values between 10 and 55 % moli OH, suitable for polymerization of vinyl chloride monomer in aqueous suspension, in which the respective polymerized product is brought about in a condition of a solution of ethyl alcohol in a weight ratio condition vinylacetate-monomer/ethylalcohol respectively polyvinylacetate/ethylalcohol, lower than 0.7 in order to obtain the separation of the solution of polyvinyl acetate in ethyl alcohol into two distinct phaes, the lower of which is useful for the production of materials in PVC with excellent physical-chemical and morphological characteristics and which do not contain residues of toxic products.</p> |
