Polyolefin foams having open and/or closed pores and consisting

Details Polyolefin foams having open and/or closed pores and consisting Polyolefin foams having open and/or closed pores and consisting

1988-07-25

1989-03-07

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

264 455, 264 53, 264 54, 4283188, 4283197, 521 51, 521143, B29D 900, B32B 326, B32B 520, C08F11000

Patent

active

048105708

ABSTRACT:
The invention relates to polyolefin foams consisting of polyolefins of ultrahigh molecular weight, i.e. weight-average molecular weight from about 4.times.10.sup.5 to 6.times.10.sup.6 g/mol and higher, and to a novel process for producing these foams by foaming a solution of a polyolefin of ultrahigh molecular weight in a solvent with the use of a physical or chemical blowing agent or of an inert gas blown into the solution, and cooling of the resulting foam to a temperature below the gelling temperature of the polyolefin. If appropriate, these foams can be provided wholly or partially with a smooth skin on their surface by superficial cooling, if appropriate under the action of pressure. These foams are distinguished by high tensile strength and impact strength values, shock-absorbing properties, low glass transition temperatures, low embrittlement at low temperatures and high chemical resistance, and they are used especially as mechanical and acoustic insulating materials, materials of construction, filter agents and implantation materials.

REFERENCES:
patent: 4033929 (1977-07-01), Stiles et al.
patent: 4655769 (1987-04-01), Zachariades
patent: 4692269 (1987-09-01), Kmiec et al.

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