Cycloaliphatic diisocyanate based rim elastomers

US5710230A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• David D. Steppan · Gibsonia, US
• Neil H. Nodelman · Fayetteville, US
• Eduard Mayer · Dormagen, DE
• A. Donald Meltzer · Brecksville, US
• Albert Magnotta · Monaca, US

Key dates

• Filing date: Jun 4, 1996
• Grant date: Jan 20, 1998
• Expiry date: Jun 4, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2120/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to a process for the production of polyurethane/urea moldings from a reaction injection molding process by processing the reaction mixture consisting of a diisocyanate and an isocyanate-reactive component via the one-shot process at an isocyanate index of about 80 to 130. The diisocyanate is an unmodified cycloaliphatic diisocyanate. The isocyanate-reactive component consists of 1) at least one polyol having functional groups which are hydroxyl groups, amine groups, or mixtures of hydroxyl groups and amine groups such that the equivalent ratio of hydroxyl groups to amine groups is from 0:1 to 1:1, and 2) at least one chain extender which is selected from diols, triols, primary aliphatic amines, secondary aliphatic amines, aminoalcohols and mixtures thereof. The equivalent ratio of hydroxyl groups to amine groups in the chain extender component is from 1:2 to 10:1. A catalyst capable of catalyzing the reaction between isocyanate groups and isocyanate-reactive groups is also present in the reaction mixture.