US 6,632,873 B2 · Two-part polyurethane adhesives for structural finger joints and method therefor

Abstract

One aspect of the present invention is an adhesive composition formed from two packs. One pack includes an isocyanate-functional prepolymer formed by reacting a polyisocyanate with an alcohol (e.g., polyol). The isocyanate equivalents from the polyisocyanate exceed the hydroxyl equivalents from the alcohol. The second pack is an aqueous polymer emulsion. These two packs are combined to form the novel adhesive composition. Another aspect of the invention is a method for joining together two surfaces of wood products by application of an adhesive thereto. The first step in this method is to mist with water the wood product surfaces to be joined. An adhesive composition then is applied to the misted wood product surfaces. Alternatively, the water misting can be replaced with an aqueous emulsion being part of the adhesive composition. Finally, the adhesive composition is cured.

Claims10

Dependent claims

A two-part adhesive composition, which comprises:

(a) an isocyanate-functional prepolymer formed by reacting a polyisocyanate with an alcohol, where the isocyanate equivalents from the polyisocyanate exceeds the hydroxyl equivalents from the alcohol;
and
(b) an aqueous polymer emulsion,
said isocyanate prepolymer and said polymer emulsion being kept separate prior to use.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/988,236Filed 19 Nov 2001

Published

US 2003/0125449 A13 Jul 2003

Granted

14 Oct 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
B32B 21/14
Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board: comprising wood board or veneer
B32B 27/12
Layered products comprising a layer of synthetic resin: next to a fibrous or filamentary layer
C09J 175/04
Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers: polyurethanes

Two-part polyurethane adhesives for structural finger joints and method therefor

Life of this patent

Two-part polyurethane adhesives for structural finger joints and method therefor

Life of this patent

Abstract

Claims10