Anti-lumping styrene polymer particles for molding foams

摘要

Expandable styrene polymer particles which have anti-stratification and anti-lumping properties during expansion are produced by dry blending styrene polymer particles in the presence of 0.01-0.04 parts of alkyl and alkylaryl ethers of polyethoxyethanol mono- and diesters of phosphoric acid per 100 parts of polymer particles. The esters may be added as sole anti-stratification or anti-lumping agent or in addition to known anti-lumping agents.