Patents Assigned to Keil, Thompson & Shurtleff - Justia Patents Search

Patents Assigned to Keil, Thompson & Shurtleff

Thermoplastic molding compositions from terephthalic acid-butane-1,4-diol-but-2-ene-1,4-diol polyesters

Patent number: 4081422

Abstract: A polyester which is manufactured by polycondensing terephthalic acid, or its lower alkyl esters, with butane-1,4-diol and at least 5 mole % of but-2-ene-1,4-diol, based on the amount of diol employed.

Type: Grant

Filed: June 25, 1976

Date of Patent: March 28, 1978

Assignee: Keil, Thompson & Shurtleff

Inventors: Claus Cordes, Hans-Josef Sterzel