Dyed polyesters, process for their preparation and their use for the dyeing of plastics

US4116923A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans Gattner · Bad Nenndorf, DE
• Ernst Spietschka · Idstein, DE
• Helmut Troster · Königstein, DE

Key dates

• Filing date: Mar 28, 1977
• Grant date: Sep 26, 1978
• Expiry date: Mar 28, 1997

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G63/68
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

When reacting a dyestuff having hydroxy, acyloxy, carboxy or carbalkoxy groups with a polyester derived from terephthalic and/or isophthalic acid and, per mol of dicarboxylic acid, about 0.75 to 1.5 mol of a low-molecular alkanetriol with primary alcohol groups (methylol groups) or, instead of said polyester, with the corresponding starting materials or precondensates, a polyester with chemically linked dyestuff units is obtained which is useful for dyeing plastics, especially polyolefins. The dyed plastic materials are heat resistant, even when containing fluorescent dyestuff units, transparent and uniformly dyed.