Polypropylene-based foamed sheet

Details Polypropylene-based foamed sheet Polypropylene-based foamed sheet

1999-10-14

2000-09-26

Foelak, Morton

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428218, 4283198, 521 79, 521142, B32B 520

Patent

active

061240257

ABSTRACT:
The present invention provides a polypropylene-based foamed sheet whose expansion ratio is 4 or more times characterized by expansion ratio A of the part (skin layer) up to 20% in each of the seat thickness from both surface of said polypropylene-based foamed sheet and expansion ratio B of part other than said skin layer (core layer) satisfying the following formula (1) and the like

REFERENCES:
patent: 5116881 (1992-05-01), Park et al.
patent: 5474841 (1995-12-01), Matsuki

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