Microcellular polyurethane elastomer containing urea groups

US6037383A · kind A · utility

Assignee

• BASF SE

Inventors

• Ruediger Krech · Diepholz, DE
• Udo Rotermund · Ortrand, DE
• Heinz Bollmann · Alfhausen, DE
• Renate Hempel · Ruhland, DE
• Wolfgang Scholz · Beverly, US
• Manfred Genz · Ostercappeln, DE

Key dates

• Filing date: Oct 7, 1998
• Grant date: Mar 14, 2000
• Expiry date: Oct 7, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2350/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A microcellular PU elastomer having improved dynamic mechanical properties and based on an isocyanate component consisting essentially of 4,4'-MDI and further customary constituents has a physicochemical structure which, in the gel permeation chromatograph (GPC) of a solution of the microcellular polyurethane elastomer prepared at 90.degree. C. in N,N-dimethylformamide containing 1 percent of di-n-butylamine measured against polymethyl methacrylate (PMMA) as standard, displays a signal occurring in addition to low molecular weight main signal and comprising one or more peaks at an (apparent) molar mass of greater than 250,000 g/mol which becomes smaller or disappears on addition of lithium chloride to this solution, and a urea content of from 14 to 18% by weight. A process is also provided for preparing such a microcellular PU elastomer having improved dynamic mechanical properties. The microcellular PU elastomers can be used for producing damping elements.