| 摘要 |
PURPOSE:To obtain titled foam of improved rigidity, preventable from heat discoloration caused by heat deterioration, by carrying out a mechanical expansion, using inert gas in the presence of foam stabilizer, of a polyvinyl chloride dispersion containing a specific reactive monomer and polymerization initiator. CONSTITUTION:The objective foam can be obtained by carrying out a mechanical expansion, using an inert gas (pref. nitrogen, helium or freon gas) in the presence of foam stabilizer, of a polyvinyl chloride dispersion containing (A) a reactive monomer highly compatible with the plasticizers for polyvinyl chloride, also crosslinkable by polymerization on heating and gelling and (B) a polymerization initiator (pref. organic peroxide). The component (A) is e.g., a trimethylolpropane trimethacrylate of formula (A is residue of compound having at least two terminal OH groups or of compound having at least one ester and ether bond; X is H, halogen, methyl, or ethyl; n and m are each 1-3. |
