A polymer prepared from monomers A, Band C in random recurring units wherein:
A is an acrylonitrile monomer;
B is a hydrophobic ethylenically unsaturated monomer;
C is an ionically charged vinyl monomer;
A being from 10 to 90 weight percent of said polymer;
B being from 5 to 40 weight percent of said polymer except that when B is a vinyl halide monomer, B is 10 to 89.9 weight percent of said polymer; and
C being from 0.1 to 10 weight percent of said polymer. The polymer is useful in preparing latex compositions that can be coated on photographic elements as protective overcoats.
一种由单体 A、Band C 以无规重复单元制备而成的聚合物,其中:A 为
丙烯腈单体;B 为疏
水性
乙烯基不饱和单体;C 为带离子的
乙烯基单体;A 占所述聚合物的 10-90%;B 占所述聚合物的 5-40%,但当 B 为卤化
乙烯基单体时,B 占所述聚合物的 10-89.9%;以及 C 占所述聚合物的 0.1-10%。 该聚合物可用于制备可涂在摄影元件上作为保护外涂层的胶乳组合物。