Transparent polyamides

US4111921A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Gerhard Bier · Troisdorf, DE
• Franz Blaschke · Neheim, DE
• Helmut aus der Funten · Merzig, DE
• Gerhard Schade · Witten, DE

Key dates

• Filing date: Sep 21, 1976
• Grant date: Sep 5, 1978
• Expiry date: Sep 21, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/265
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A polyamide composition, useful in the preparation of transparent sheets, having improved resistivity toward solvents containing moieties of terephthalic acid and 2-methylpentamethylenediamine, said polyamide characterized by a content of moieties of 2-ethyltetramethyldiamine and/or of isophthalic acid in a concentration totalling 15 to 30 mole percent, with respect to the sum of all diamine moieties or all dicarboxylic acid moieties, as the case may be.