Method for manufacturing expandable styrene type polymer particl

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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521 59, 521146, C08J 920

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active

051323303

ABSTRACT:
A method for manufacturing expandable styrene type polymer particles is disclosed, which comprises the steps of adding a styrene type monomer to styrene type polymer seed particles suspended in an aqueous dispersing medium, continuously or intermittently to be polymerized while being absorbed thereby, and impregnating the resulting polymer particles with an easily volatile blowing agent to obtain expandable styrene type polymer particles, the improvement wherein styrene type polymer particles whose weight-average molecular weight (Mw.sub.1) is not more than 2/3 of the weight-average molecular weight (Mw.sub.2) of the resulting polymer particles are used as said styrene type polymer particles. The present invention provides expandable styrene type polymer particles excellent in moldability and foamed articles high in strength and fine in external appearance.

REFERENCES:
patent: 2744291 (1956-05-01), Stastny et al.
patent: 4968466 (1990-11-01), Allen et al.
patent: 4990540 (1991-02-01), Hahn et al.

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