Patent · US Expired

Process for producing polyester film containing a slip agent

US4921670A · kind A · utility

9Cited by

7References

11Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hermann Dallmann · Wiesbaden, DE
Lothar Bothe · Mainz, DE
Guenther Crass · Taunusstein, DE
Werner Schaefer · Hofheim, DE

Key dates

Filing date	Jul 13, 1988
Grant date	May 1, 1990
Priority date	—
Expiry date	Jul 13, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2367/02
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A process is described for the production of an oriented, heat-set polyester film including an admixture of polydiorganosiloxane in the amount of 0.001 to 2% by weight, as well as further additives, such as inert inorganic and/or organic particles. The thermoplastic material is melted in an extruder and extruded through an appropriate die to give a cast film, is then quenched, reheated, stretch oriented, and heat set. The characteristic criteria is the addition of the polydiorganosiloxane to the polydiorganosiloxane-free polyester in the form of a masterbatch.

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