Process for producing coated styrenic polymer beads for heat res

Details Process for producing coated styrenic polymer beads for heat res Process for producing coated styrenic polymer beads for heat res

1982-04-01

1983-05-24

Seccuro, Carman J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525255, 525261, 525301, 521 56, 521 57, 521 59, 521 60, 427222, 428407, C08F21208, C08F22006, C08L 2508, C08J 916

Patent

active

043851568

ABSTRACT:
Styrenic polymer expandable beads that are useful in forming heat-resistant foamed articles are prepared by forming an aqueous suspension of initial styrenic polymer beads and adding thereto a portion of a comonomer solution of styrenic monomer and methacrylic acid, which solution also contains a polymerization regulator, forming an emulsion of catalyst, monomer solution and polyvinyl alcohol suspending agent, adding portions of the emulsion to the suspension and then adding the remainder of the comonomer solution to the suspension, and the suspension with added monomers is heated to copolymerize the styrenic monomer and methacrylic acid about the initial beads and form a coating about the beads.

REFERENCES:
patent: 3047534 (1962-07-01), Dyer et al.
patent: 3786115 (1974-01-01), Osuga et al.
patent: 3839308 (1974-10-01), Carrock
patent: 4091054 (1978-05-01), Saito et al.

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