Composite material having polypropylene foam layer

Details Composite material having polypropylene foam layer Composite material having polypropylene foam layer

1997-11-07

1999-07-27

Copenheaver, Blaine R.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

264 454, 264 466, 264 51, 4283186, 4283188, 4283199, B32B 518, B32B 532, B29C 6720

Patent

active

059287764

ABSTRACT:
A composite material having a skin layer, an intermediate, cushioning layer provided on one side of the skin layer, and a backing layer provided on the cushioning layer, wherein the backing layer is made of a non-crosslinked polypropylene resin foam and having a melting point MB in the range of 130-170.degree. C., wherein the cushioning layer is a crosslinked polypropylene resin foamed sheet having a gel fraction of 20-70% by weight. The cushioning layer has an endothermic peak in DSC curve at a peak temperature of PC which is in the range of 130-170.degree. C. and which is not smaller than (MB-15).degree. C. but not greater than (MB+10).degree. C. The endothermic peak has such an area at temperatures higher than MB that corresponds to a calorific value in the range of 3-30 J/g. The backing layer may be formed by expansion molding of expanded polypropylene particles within a mold cavity in which a laminate of the skin layer and the cushioning layer is placed in position.

REFERENCES:
patent: 5188882 (1993-02-01), Uchiyama et al.
patent: 5196151 (1993-03-01), Sakaida et al.
patent: 5304580 (1994-04-01), Shibayama et al.
patent: 5474841 (1995-12-01), Matsuki et al.

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