US4808255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable reactive hot melt urethane adhesive composition having a thermoplastic polymer, a compatible, curing urethane polyester polyol prepolymer and a tackifying agent
Assignee: HB Fuller Licensing and Financing Inc
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Filing: 1987-05-07
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Granted: 1989-02-28
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Expires: 2007-05-07
Abstract
Abstract Reactive hot melt adhesive compositions combining the characteristics of hot melt adhesives and curing urethane adhesive can be prepared by blending an ethylene-vinyl monomer thermoplastic polymer having sufficient structural integrity to provide cohesive strength with a urethane prepolymer and a tackifying agent. The composition has sufficient green strength to form initial bonds. Additionally, over time, the composition cures to a final rigid, resilient quality structural adhesive bond.
Inventors
- 👤 Virginia C. Markevka
- 👤 John M. Zimmel
- 👤 Elizabeth R. Messman
- 👤 William L. Bunnelle
- 👤 Jeffrey M. Swoboda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C09; C09J; C09J175/00; C09J175/04; C09J175/06; C08G2170/00; C08G2170/20; C08L; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A reactive hot melt urethane adhesive composition having extended pot stability, bond heat stability, green strength and cured bond strength which comprises: (a) a urethane prepolymer composition comprising the reaction product of an isocyanate compound and a polyester-polyol prepared by reacting a polyfunctional carboxylic acid compound and an aliphatic or cycloaliphatic diol or triol compound; (b) about 1 to 200 parts by weight per each one hundred parts of the prepolymer of a structural thermoplastic ethylene vinyl monomer copolymer composition having a melt index of about 0.2 to 1000 and a vinyl monomer content of about 10 to 60 wt-%; and (c) about 1 to 200 parts by weight per each one hundred parts by weight of the prepolymer of a compatible aliphatic, aromatic or aliphatic-aromatic tackifying resin.
Claim 2
Dependent Claim
128 words
A reactive hot melt urethane adhesive composition having extended pot stability, bond heat stability, green strength and cured bond strength which comprises: (a) a urethane prepolymer composition comprising the reaction product of an isocyanate compound and a polyester-polyol prepared by reacting a polyfunctional carboxylic acid compound and an aliphatic or cycloaliphatic diol or triol compound; (b) about 1 to 200 parts by weight per each one hundred parts of the prepolymer of a structural thermoplastic ethylene vinyl monomer copolymer composition having a melt index of about 0.2 to 1000 and a vinyl monomer content of about 10 to 60 wt-%; and (c) about 1 to 200 parts by weight per each one hundred parts by weight of the prepolymer of a compatible aliphatic, aromatic or aliphatic-aromatic tackifying resin.
Claim 3
Dependent Claim
13 words
The adhesive of claim 1 wherein the vinyl monomer content comprises 18-50 wt-%.
Claim 4
Dependent Claim
15 words
The adhesive of claim 1 wherein the polyol of the polyester-polyol comprises a cycloaliphatic diol.
Claim 5
Dependent Claim
13 words
The adhesive of claim 3 wherein the cycloaliphatic diol comprises a dihydroxyalkyl cyclohexane.
Claim 6
Dependent Claim
12 words
The adhesive of claim 4 wherein the dihydroxyalkyl cyclohexane comprises a 1,4-dihydroxymethyl-cyclohexane.
Claim 7
Dependent Claim
13 words
The adhesive of claim 3 wherein the aliphatic diol comprises a 1,6-hexane diol.
Claim 8
Dependent Claim
17 words
The adhesive of claim 1 wherein the polyfunctional carboxylic acid compound comprises an aliphatic dicarboxylic acid compound.
Claim 9
Dependent Claim
16 words
The adhesive of claim 7 wherein the aliphatic dicarboxylic acid compound comprises a dimer fatty acid.
Claim 10
Dependent Claim
17 words
The adhesive of claim 1 wherein the ethylene vinyl monomer composition comprises an ethylene vinyl acetate copolymer.
Claim 11
Dependent Claim
28 words
The adhesive of claim 9 wherein the ethylene vinyl acetate copolymer comprises 14 to 33 wt-% vinyl acetate and the tackifying resin comprises an aliphatic or aliphatic-aromatic resin.
Claim 12
Dependent Claim
27 words
The adhesive of claim 9 wherein the ethylene vinyl acetate comprises 28-50 wt-% vinyl acetate and the tackifying resin comprises an aromatic tackifying resin or aliphatic-aromatic resin.
Claim 13
Dependent Claim
33 words
A method of bonding at least two surfaces which comprises applying to a bondline that can join two surfaces an effective bonding amount of the adhesive of claim 1 and curing the adhesive.
Claim 14
Dependent Claim
13 words
The method of claim 12 wherein the adhesive is cured with atmospheric moisture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |