Hotmelt bonding process

US5407517A · 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: Mar 15, 1991
• Grant date: Apr 18, 1995
• Expiry date: Mar 15, 2011

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 process for bonding surfaces with isocyanate-containing prepolymers having an isocyanate group content of less than 1.8% by weight, based on the prepolymer, and an average molecular weight MW.sub.n of at least 4,500 in which (a) the prepolymers are prepared by the reaction of (i) polyester diols prepared from dodecanedioic acid and even-numbered alkane diols containing at least 6 carbon atoms and (ii) diisocyanates; (b) the prepolymer is applied as a hotmelt adhesive at a temperature of 80 to 160.degree. C. by spin-spraying onto at least one surface to be bonded; and (c) the treated surface is brought into intimate contact with a second surface to be bonded.