Process for the preparation of highly elastic plastics

US5159046A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerhard Grogler · Leverkusen, DE
• Andreas Ruckes · Leverkusen, DE
• Richard Kopp · Cologne, DE
• Heinrich Hess · Cologne, DE
• Robert Eiben · Lampertheim, DE
• James-Michael Barnes · Breitscheid, DE

Key dates

• Filing date: Jun 26, 1990
• Grant date: Oct 27, 1992
• Expiry date: Jun 26, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8045
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of a modified 1,5-naphthylene diisocyanate containing urea and biuret groups comprising reacting PA0 (a) 1,5-naphthylene diisocyanate in molten form with PA0 (b) a mixture comprising about 0.02 to about 0.5 mole of water per mole of 1,5-naphthylene diisocyanate and about 1 to about 10 parts for each part of water of an organic solvent. The present invention further relates to a process for the preparation of elastomeric moldings comprising reacting by the one-shot or prepolymer process at an isocyanate index of 70 to 130 a modified 1,5-naphthylene diisocyanate containing urea and biuret groups with compounds containing at least two isocyanate-reactive groups and having a molecular weight in the range from about 500 to about 10,000 and, optionally, organic compounds containing isocyanate-reactive groups and having a molecular weight in the range from 60 to 499.