Process for preparing expandable styrene polymer particles
AssigneeSekisui Kaseihin Kogyo Kabushiki Kaisha
InventorsToshiki Ikeda, Fumito Yamai, Tomohiko Ishida
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Abstract
A process for preparing expandable styrene polymer particles by using magnesium oxide as a suspending agent to prevent agglomeration of styrene polymer particles during impregnation with an expanding agent. The process comprises preparing expandable styrene polymer particles from styrene polymer particles in water, wherein the expanding agent (which does not dissolve styrene polymer particles or slightly swells the particles, and has a boiling point lower than the softening point of the particles) is added in the presence of the suspending agent and the particles being impregnated thereby.
Claims8
In a process for preparing expandable styrene polymer particles wherein styrene polymer particles are dispersed in water in the presence of a suspending agent and an expanding agent is added to the suspension to impregnate the particles, the improvement comprising employing magnesium oxide in an amount from about 0.2 to about 1.0% by weight of the polymer particles as the suspending agent.
Dependencies are inferred from the claim text.