Patent · US Expired

Process for the production of porous moldings

US5494629A · kind A · utility

11Cited by

7References

7Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Sabine Gorden · Krefeld, DE
Hermann van Laak · Hünxe, DE
Holger Schmitz · Oberhausen, DE

Key dates

Filing date	Dec 5, 1994
Grant date	Feb 27, 1996
Priority date	—
Expiry date	Dec 5, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2323/06
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Porous moldings of ultrahigh-molecular-weight polyethylene obtained by injection molding polyethylenes having an intrinsic viscosity of 500 to 5000 ml/g, a mean particle size of 100 to 1500 .mu.m, and a bulk density of at least 0.35 g/cm.sup.3. The polymer is preferably molded in an injection-molding machine at 160.degree. to 260.degree. C. and an injection pressure of 80 to 150 MPa. The ratio between the flow distance of the material in the injection mold and the wall thickness of the molding is a maximum of 7.5.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.