Expanded molded article having voids

Details Expanded molded article having voids Expanded molded article having voids

2005-09-20

2009-08-25

Vo, Hai (Department: 1794)

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

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S059000, C521S060000, C521S139000, C521S142000, C428S304400, C428S315500, C428S315700

Reexamination Certificate

active

07579384

ABSTRACT:
An expanded molded article having a void percentage of 5 to 50%, the molded article comprising 50 to 800 parts by weight of styrene-based resin relative to 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin which can be obtained by using a metallocene catalyst, wherein the molded article is obtained by impregnating styrene-modified linear low-density polyethylene-based resin beads with a volatile blowing agent to provide expandable beads, pre-expanding the expandable beads and then subjecting the obtained pre-expanded beads to expansion molding, the styrene-modified linear low-density polyethylene-based resin beads each have the styrene-based resin dispersed in the form of particles, and a diameter of particle is 0.8 μm or smaller in a surface region within at least 5 μm from the bead surface and in a center region within a 5 μm radius from the bead center.

REFERENCES:
patent: 2003/0187142 (2003-10-01), Hellums
patent: 2006/0058406 (2006-03-01), Matsumura et al.
patent: 2006/0063847 (2006-03-01), Matsumura et al.
patent: 2006/0217452 (2006-09-01), Inada et al.
patent: 2007/0243365 (2007-10-01), Matsumura et al.
patent: 2007/0249784 (2007-10-01), Matsumura et al.
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patent: 58-53003 (2003-03-01), None
patent: WO 2004085528 (2004-10-01), None
Translation of JP 07-278341 ,“Pre-Expanded Bead of Uncrosslinked Linear-Chain Low Density Polyethylene Resin and Its Production”, Takeda et al, Oct. 24, 1995.
Translation of JP 07-080873, “Styrene-Modified Polyolefin-Based Resin Foam-Molded Body”, Endo et al, Mar. 28, 1995.
English Language Abstract of JP 62-59642., Mar. 16, 1987.
English Language Abstract of JP 7-80873., Mar. 28, 1995.
U.S. Appl. No. 11/659,469 (Matsumura et al.), filed Feb. 6, 2007 and entitled, “Styrene-Modified Polyethylene-Resin Beads, Styrene-Modified Polyethylene-Based Expandable Resin Beads, Production Method therefore, Pre-Expanded Beads and Expanded Molded Article”.
U.S. Appl. No. 11/659,466 (Matsumura et al.), filed Feb. 6, 2007 and entitled, “Styrene-Modified Linear Low-Density Polyethylene-Resin Beads, Styrene-Modified Linear Low-Density Polyethylene-Based Expandable Resin Beads, Production Method therefore, Pre-Expanded Beads and Expanded Molded Article”.

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