# US 5,705,547 A · Moisture-cure urethane adhesives containing .gamma.-butyrolactone

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- Number: US 5,705,547 A
- Document ID: US5705547A
- Status: Granted
- Kind: A
- Application number: 08/730,249
- Filed: 1996-10-15
- Granted: 1998-01-06
- Earliest claimed: 1995-07-14
- Assignees: Morton International, Inc.
- Inventors: James L. Richards; Larry F. Brinkman
- Web page: https://patentgrep.com/patent/US5705547A

## CPC

- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C09J 175/04: Polyurethanes
- C08L 2666/34: Oxygen-containing compounds, including ammonium and metal salts
- Y10S 528/905: Polymer prepared from isocyanate reactant has adhesive property
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A one-part, moisture-cure urethane adhesive composition contains between 1 and 10 phr .gamma.-butyrolactone which acts as a moisture diffusion agent, thereby promoting a more rapid cure.

## Claims

### Claim 1

In a method of bonding a first substrate to a second substrate comprising interposing between said substrates, in the presence of moisture, a moisture-curable urethane composition comprising a urethane resin component comprising polyfunctional isocyanate, said composition having no active hydrogen or urethane-reactive curative, said composition curing in the presence of moisture at ambient temperatures, the improvement wherein said urethane adhesive composition further contains between about 1 and about 10 parts per hundred parts resin by weight .gamma.-butyrolactone as a moisture diffusion agent.

### Claim 2 (depends on 1)

The method according to claim 1 wherein said composition contains between about 1 and about 5 phr by weight .lambda.-butyrolactone.

### Claim 3 (depends on 1)

The method according to claim 1 wherein said composition contains between about 2 and about 3 phr by weight .lambda.-butyrolactone.

### Claim 4 (depends on 1)

The method according to claim 1 wherein said composition is the reaction product of polyfunctional isocyanate with a hydroxyl-terminated polymer selected from the group consisting of polyether, polyester, polyester/polyether and mixtures thereof, the reaction mixture having an NCO/OH ratio of between about 1.1:1 and about 10:1.