Thermoplastic polymer sheets or web material useful as surfacing

Details Thermoplastic polymer sheets or web material useful as surfacing Thermoplastic polymer sheets or web material useful as surfacing

1977-04-26

1978-12-05

Anderson, Philip

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

15624424, 521 59, 264 51, 264 75, 264129, 264162, 264211, 264321, 264DIG8, 428106, 428151, 428315, 428910, B29D 2700

Patent

active

041286898

ABSTRACT:
The invention relates to a process for preparing thermoplastic sheets or webs suitable for use as surfacing materials.
Sheets of thermoplastic polymers are known as surfacing materials and, when foamed, as substitutes for wood, but available materials do not closely resemble natural wood in appearance. The present invention provides a process whereby sheets or webs are obtained which can provide a wide variety of decorative finishes and which can approximate the appearance of such natural products as wood and marble.
The process of the invention comprises the extrusion of a foamable mixture of immiscible thermoplastic polymers, one of which is crystalline and of higher melting point than another, stretching the resulting foamed extrudate, compressing the stretched extrudate and then cooling the stretched and compressed extrudate. The resulting product is substantially impermeable and has integral patterning and can be used as a surfacing material in a variety of applications.

REFERENCES:
patent: 3384531 (1968-05-01), Parrish
patent: 3755520 (1973-08-01), Cogliano
patent: 3856719 (1974-12-01), Miyamoto et al.
patent: 3931380 (1976-01-01), Belivakici et al.
patent: 3932569 (1976-01-01), Fuss

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