| 摘要 |
<p>Improved aqueous vinylidene chloride copolymer latexes are provided in which the dispersed polymer particles are heterogeneous and comprise from 35 to 75 weight percent of polymerized vinylidene chloride and contain a major amount of a soft copolymer core comprising vinylidene chloride and an aliphatic conjugated diene and a minor amount of a polymeric shell which encompasses the core portion and which consists essentially of (a) an aliphatic conjugated diene, a monovinylidene aromatic monomer or a saturated aliphatic ester of monoethylenically unsaturated carboxylic acids; (b) optionally, up to 40 weight percent (based upon the shell) of vinylidene chloride; and (c) optionally, up to 10 weight percent based upon such shell of a monoethylenically unsaturated carboxylic acid. These latexes have good heat and light stability and are useful as paper coatings, in carpet back- sizing and in nonwoven fabrics.</p> |
