| 摘要 |
<p>C-4722 FOAMABLE PVC RESIN FORMULATION, PROCESS FOR FOAMING, AND PRODUCT THEREOF A foamable polyvinyl chloride (PVC) resin formulation containing (1) a copolymer formed by emulsion polymerizing from about 70% to about 90% vinyl chloride, from about 5% to about 15% vinyl acetate and from about 5% to about 15% of a bis (hydrocarbyl)vinylphosphonate; (2) a polyester or epoxy plasticizer (or mixture thereof) and (3) 4,4'-oxybis (benzene sulfonyl hydrazide) is foamed to form a product having a smooth unblistered surface, good cell quality and medium density. The foaming can take place at a temperature of from about 320.degree.F.(160.degree.C.) to about 400.degree.F. (204.degree.C.) for a period of time of from about 6 to about 20 minutes.</p> |
