Polyurethane hot-melt adhesive with reduced viscosity

US8865842B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Michael Krebs · Hilden, DE
• Uwe Franken · Dormagen, DE

Key dates

• Filing date: Mar 12, 2013
• Grant date: Oct 21, 2014
• Expiry date: Mar 12, 2033

Classification

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

Abstract

A reactive melt adhesive containing 30 to 70% of at least one prepolymer having at least two isocyanate groups having a molecular weight below 6000 g/mol, manufactured from polyether polyols and/or polyester polyols reacted with a molar excess of diisocyanates, the prepolymer containing less than 1% monomeric diisocyanate; 30 to 70 wt % of a thermoplastic polyester having a number-average molecular weight (MN) below 6000 g/mol, which comprises fewer than 1.4 groups reactive with NCO; and up to 30 wt % additives from the group of the catalysts, resins, plasticizers, fillers, pigments, stabilizers, or adhesion promoters.