Process for the preparation of polyurethane elastomers in which at least two reactant portions are introduced into separate positions of a screw machine

US4250292A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Georg Niederdellmann · Dormagen, DE
• Wilhelm Goyert · Leverkusen, DE
• Ernst Meisert · Leverkusen, DE
• Alfred Eitel · Dormagen, DE
• Hans Wagner · Dormagen, DE
• Hans Hespe · Leverkusen, DE

Key dates

• Filing date: Sep 13, 1979
• Grant date: Feb 10, 1981
• Expiry date: Sep 13, 1999

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J19/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to an improved continuous process for the preparation of polyurethane elastomers which are distinguished from the products produced by known processes by increased elasticity, reduced shrinkage, higher rigidity (limit bending stress), improved cold notched bar impact resistance and good thermal stability.