Process for the preparation of expandable styrene polymer particles
AssigneeSekisui Kaseihin Kogyo Kabushiki Kaisha
InventorsFumito Yamai, Tomohiko Ishida, Yoshinori Ikeda
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Abstract
A process for preparing expandable styrene polymer particles by using calcium hydroxide 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.
Claims6
In the process for the preparation of expandable styrene polymer particles comprising impregnating said particles with an expanding agent in the absence of surface active agents, the improvement which comprises employing in the process calcium hydroxide in an amount from 0.3 to 1.5% by weight of the styrene polymer particles, as the sole suspending agent.
Dependencies are inferred from the claim text.