Patent · US Expired

Process for manufacturing thin, non-porous gas permeable polycarbonate films

US4086310A · kind A · utility

37Cited by

18References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Ludwig Bottenbruch · Krefeld, DE
Gunther Kampf
Volker Serini · Krefeld, DE
Hugo Vernaleken · Walsrode, DE

Key dates

Filing date	Mar 15, 1976
Grant date	Apr 25, 1978
Priority date	—
Expiry date	Mar 15, 1996

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31507
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Non-porous, thin, polycarbonate films and a process for their production. Solutions of polycarbonates in concentrations of less than 5 parts solids per 100 parts solvent are applied to the surface of liquids immiscible, or sparingly miscible with, the solvent for the polycarbonate. The solvent is then evaporated, and the resultant film removed. The films are useful for the separation of gas and liquid mixtures and for electrical insulating purposes.

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