| 摘要 |
The disclosure relates to a composition composed of an aqueous mixture of at least one first copolymer comprising mer units derived from vinylidene halide and mer units derived from C1-C2 alkyl acrylate, said mer units derived from C1-C2 alkyl acrylate being present in from 5 to 40 weight percent of the first copolymer; and at least one second copolymer comprising mer units derived from vinylidene halide and mer units derived from C4-C5 alkyl acrylate, said mer units derived from C4-C5 alkyl acrylate being present in from 3 to 40 weight percent of the second copolymer, wherein said first copolymer and said second copolymer are in a weight ratio of 90:10 to 10: 90; the first and second copolymers together form from 10 to 50 weight percent of the aqueous mixture; and the aqueous mixture has a pH of 1.5 to 3.5. |
