Verbesserte,expandierbare Styrolpolymerisate

摘要

A compolymer composition which expands on heating to a low density shrink resistant cellular foam comprises a vinyl aryl monomer copolymerized with from about 0.7 to 0.025% by weight of vinyl aryl monomer of tung oil, said composition containing from 3-20% by weight of copolymer of a blowing agent. Suitable vinyl aryl monomers are styrene, isopropylstyrene, alpha-methylstyrene, nuclear dimethylstyrenes, chlorostyrenes and vinyl naphthalene. Preferred blowing agents are volatile hydrocarbons containing from 1-7 carbon atoms. The tung oil can be introduced either by mixing it with the vinyl aryl monomer prior to polymerization, or by adding it after a portion of the vinyl aryl monomer has polymerized. Self-extinguishing agents and plasticizers may also be present.