Hot melt adhesives

US5162457A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Eduard Hansel · Wuppertal, DE
• Walter Meckel · Neuss, DE
• Klaus Konig · Leverkusen, DE
• Otto Ganster · Odenthal, DE
• Horst Stepanski · Leverkusen, DE

Key dates

• Filing date: Oct 31, 1991
• Grant date: Nov 10, 1992
• Expiry date: Oct 31, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S528/905
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to crystalline, isocyanate group-containign hot melt adhesives based on PA1 from 70-95% by weight of a prepolymer A based on polyester diols having a molecular weight of from 1500 to 10,000 and melting points of from 50.degree. to 90.degree. C. and diisocyanates in a ratio of isocyanate groups of the diisocyanate to the hydroxyl groups of the polyester diol of from 3:1 to 1.2:1 and PA1 from 5-30% by weight of a component B having a molecular weight of from 1000 to 10,000 based on polyesters having melting points of from 60.degree. to 150.degree. C., in which component B contains at most 0.5 Zerewitinow active groups per molecule.