Method for heat-sealing textile materials with polyurethane adhesives

US4310373A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Gunter Schuhmacher · Weinheim, DE
• Erich Fahrbach · Weinheim, DE
• Sepp Wagner · Weinheim, DE

Key dates

• Filing date: Feb 8, 1980
• Grant date: Jan 12, 1982
• Expiry date: Feb 8, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/3667
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention described herein relates to a method for heat sealing the opposing surfaces of planar textile materials which comprises applying a heat-seal adhesive to at least one of the opposing surfaces of the textiles, and then pressing the opposing surfaces of the textiles together under heat and pressure to heat-seal the textile surfaces together. The heat-seal adhesive employed is a low-melting polyurethane prepared by reacting at least one diisocyanate with at least one polyol having a molecular weight between about 500 and 5000, at least one diol which is branched or includes an ether group, and at least one diol which is unbranched. The diol reactants have an average molecular weight of less than about 500. The total hydroxyl group content of the reactants exceeds or equals the total isocyanate content of the reactants.