| 摘要 |
A novel film made from a latex having an exceptional balance of physical properties is prepared by polymerizing an unsaturated dicarboxylic acid with a copolymerizable monomer(s) and, optionally, a crosslinking monomer in the presence of an effective amount of a surfactant and an initiator. In a preferred embodiment of the process for making the film, all of the unsaturated dicarboxylic acid is initially placed in the reactor and a premix containing the copolymerizable monomer(s) and crosslinking monomer is metered into the reactor. The unsaturated dicarboxylic acid contains from 4 to about 10 carbon atoms and is used in an amount from about 1 to about 20 weight parts, the amount of the copolymerizable monomer employed is from about 70 to 99 weight parts, and the amount of the crosslinking monomer, which is optional, is from about 0.5 to about 10 weight parts. The novel films have a Tg of from about -20.degree.C. to about -60.degree.C., a percent hysteresis loss of less than about 20%, and exhibit a tensile strength of at least 300 psi and an elongation of at least 350 percent. Additionally, the novel film has a cross product of tensile strength times percent elongation of at least 140,000.
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