Expandable polystyrenic resin particles and production...

Details Expandable polystyrenic resin particles and production... Expandable polystyrenic resin particles and production...

2007-10-25

2011-12-27

Kugel, Timothy J. (Department: 1765)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C264S053000, C264S239000, C521S139000

Reexamination Certificate

active

08084510

ABSTRACT:
Expandable polystyrenic resin particles having superior resistance to cracking of a molded foam product, having superior retention of blowing agent and maintaining expandability over a long period of time, a production process thereof, and a molded foam product are provided. These expandable polystyrenic resin particles contain a volatile blowing agent in polystyrenic resin particles obtained by impregnating and polymerizing a styrenic monomer in polyolefin resin particles to form a polystyrenic resin, wherein together with the styrenic monomer being used at 140 to 600 parts by weight to 100 parts by weight of the polyolefin resin particles, the average thickness of the surface layer observed in scanning electron micrographs obtained by immersing sections cut into halves through the center from the surface of the resin particles in tetrahydrofuran followed by extracting the polystyrenic resin component and capturing cross-sections of said sections is 15 to 150 μm, and the volatile blowing agent is contained at 5.5 to 13.0% by weight.

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Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration; International Application No. PCT/JP2007/071350; International Filing Date: Oct. 25, 2007. (Forms: PCT/ISA/220 and PCT/ISA/210).

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