Moisture-curing, NCO-reactive polyurethane hotmelt adhesive composition

US5190607A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joachim Werner · Bethel Park, US
• Walter Meckel · Neuss, DE
• Horst Stepanski · Leverkusen, DE
• Jose Colinas-Martinez · Wermelskirchen, DE

Key dates

• Filing date: Aug 10, 1992
• Grant date: Mar 2, 1993
• Expiry date: Aug 10, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a moisture-curing, NCO-reactive polyurethane hotmelt adhesive composition to a process for its production and to its use as an adhesive wherein the hot-melt adhesive characterized by a reaction product obtainable by reaction of: PA0 A) a mixture of: PA1 i) polyfunctional polyol component which is liquid or highly viscous (paste-like) at room temperature (25.degree. C.) and which has an average molecular weight of 500 to 5,000 and which is consisting of at least one polyether and/or polyester polycol, and PA1 ii) a polyfunctional polyol component which is crystalline at room temperature (25.degree. C.) and which has a molecular weight of 500 to 10,000 and preferably 2,000 to 5,000 with a mixture of PA0 B) PA1 i) a polyisocyanate component containing two differently reactive NCO groups and PA1 ii) a diisocyanate component having an NCO reactivity to hydroxyl groups which is greater which is greater than that of the less reactive NCO groups of the polyisocyanate component containing two differently reactive NCO groups. the overall ratio of NCO:OH groups being greater than 1, and the ratio of the NCO groups of the polyisocyanate component containing two differe…