EP0232055A2
Expired / Lapsed
EP
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Thermally stable hot melt moisture curing polyurethane adhesive composition
Assignee: HB Fuller Licensing and Financing Inc
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Filing: 1987-01-20
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Granted: —
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Expires: 2007-01-20
Abstract
Abstract A one-package thermally stable hot melt pressure-sensitive moisture-cure polyurethane composition that can be extruded at elevated temperatures to form a hot melt glue line with very high green strength that can moisture-cure to a storng urethane adhesive bond comprises:(a) a green bonding amount of a film-forming thermoplastic poly(ethylene-vinyl monomer) polymer;(b) an amount of a liquid polyurethane prepolymer composition, having a viscosity of less than 25,000 cP at 25°C, comprising the reaction product of a polyfunctional hydroxy compound having a number average molecular weight of at least 1,000 and a polyfunctional isocyanate compound at a ratio of hydroxyl groups to isocyanate groups of 0.1 to 0.7:1, sufficient to form a rigid moisture-cure bond; and(c) a phenol-free, aromatic, or aliphatic-aromatic polymeric tackifier composition.
Inventors
- 👤 Virginia Creedon Markevka
- 👤 Sandra Jean Mackey
- 👤 William Lynn Bunnelle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 11:27
CPC Classifications
C; C09; C09J; C09J175/00; C09J175/04; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08L; C08L23/00; C08L31/00; C08L33/00; C09J131/00; C09J131/02; C09J131/04; C08L2666/00; C08L2666/02; C08L2666/14; C08L75/00; C08L75/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3602; Y10T442/3667; Y10T442/60; Y10T442/659
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
A hot melt thermosetting urethane adhesive composition having thermal stability that can be extruded as a hot melt adhesive to form an initially high green strength hot melt bond and can moisture cure to a rigid moisture cured polyurethane bond, which comprises: (a) a green bonding amount of a film-forming thermoplastic poly(ethylene-vinyl monomer) polymer; (b) an amount of a liquid polyurethane prepolymer composition, having a viscosity of less than 25,000 cP at 25°C., comprising the reaction product of a polyfunctional hydroxy compound having a number average molecular weight of at least 1,000 and a polyfunctional isocyanate compound at a ratio of hydroxyl groups to isocyanate groups of 0.1 to 0.7:1, sufficient to form a rigid moisture-cure bond; and (c) a phenol-free, aromatic, or aliphatic-aromatic polymeric tackifier composition.
Claim 2
Dependent Claim
127 words
A hot melt thermosetting urethane adhesive composition having thermal stability that can be extruded as a hot melt adhesive to form an initially high green strength hot melt bond and can moisture cure to a rigid moisture cured polyurethane bond, which comprises: (a) a green bonding amount of a film-forming thermoplastic poly(ethylene-vinyl monomer) polymer; (b) an amount of a liquid polyurethane prepolymer composition, having a viscosity of less than 25,000 cP at 25°C., comprising the reaction product of a polyfunctional hydroxy compound having a number average molecular weight of at least 1,000 and a polyfunctional isocyanate compound at a ratio of hydroxyl groups to isocyanate groups of 0.1 to 0.7:1, sufficient to form a rigid moisture-cure bond; and (c) a phenol-free, aromatic, or aliphatic-aromatic polymeric tackifier composition.
Claim 3
Dependent Claim
25 words
The composition of claim 1, wherein the poly(ethylene-vinyl monomer) composition comprises an ethylene-vinyl acetate polymer having an ethylene content of from 10 to 55 wt-%.
Claim 4
Dependent Claim
18 words
The composition of claim 2, wherein the ethylene-vinyl acetate polymer has from 45 to 60 wt-% vinyl acetate.
Claim 5
Dependent Claim
39 words
The composition of claim 3, wherein the ethylene-vinyl acetate has a vinyl acetate concentration of 50 to 60 wt-%, a melt index of 2-90, and is present in the adhesive composition at a concentration of 15 to 35 wt-%.
Claim 6
Dependent Claim
23 words
The composition of any preceding claim, wherein the prepolymer is the reaction product of a polyalkylene glycol and an aromatic polyfunctional isocyanate compound.
Claim 7
Dependent Claim
54 words
The composition of claim 5, wherein the polyalkylene glycol is an alkylene oxide capped polypropylene glycol, the aromatic polyfunctional isocyanate compound is diphenylmethane diisocyanate, the prepolymers are present in the adhesive composition at a concentration of 25 to 65 wt-% and the prepolymer has a viscosity of about 100 to 10,000 cP at 25°C.
Claim 8
Dependent Claim
34 words
The composition of claim 5 or 6, wherein the prepolymer is present in the adhesive composition at a concentration of 30 to 50 wt-% and has a viscosity of about 2,000-8,000 cP at 25°C.
Claim 9
Dependent Claim
25 words
The composition of any preceding claim, wherein the tackifier polymer comprises monomer(s) selected from C 4-6 diene, a styrene monomer an indene monomer or dicyclopentadiene.
Claim 10
Dependent Claim
14 words
The composition of claim 8, wherein the tackifier is a styrene or alphamethylstyrene copolymer.
Claim 11
Dependent Claim
109 words
An adhesive having both hot melt and thermosetting urethane adhesive properties which comprises: (a) from 10 to 50 wt-% of an ethylene vinyl acetate polymer having a melt index of 2-90 and a vinyl acetate content of greater than 50 wt-%; (b) from 20 to 60 wt-% of a polyurethane prepolymer comprising the reaction product of a polypropylenediol and diphenyl methane diisocyanate at a ratio of hydroxyl groups to isocyanate groups of from 0.2-0.5:1, having a viscosity of less than 10,000 cP at 25°C; (c) from 10 to 60 wt-% of a polymeric tackifying resin comprising a poly(styrenic monomer); and (d) from 0 to 5 wt-% of an antioxidant.
Claim 12
Dependent Claim
109 words
An adhesive having both hot melt and thermosetting urethane adhesive properties which comprises: (a) from 10 to 50 wt-% of an ethylene vinyl acetate polymer having a melt index of 2-90 and a vinyl acetate content of greater than 50 wt-%; (b) from 20 to 60 wt-% of a polyurethane prepolymer comprising the reaction product of a polypropylenediol and diphenyl methane diisocyanate at a ratio of hydroxyl groups to isocyanate groups of from 0.2-0.5:1, having a viscosity of less than 10,000 cP at 25°C; (c) from 10 to 60 wt-% of a polymeric tackifying resin comprising a poly(styrenic monomer); and (d) from 0 to 5 wt-% of an antioxidant.
Claim 13
Dependent Claim
15 words
The composition of claim 10 wherein the polymeric tackifying resin comprises an alphamethyl styrene copolymer.
Claim 14
Dependent Claim
18 words
The composition of claim 10 or 11, wherein the viscosity of the prepolymer is 2,000-6,000 cP at 25°C.
Claim 15
Independent Claim
40 words
A method of joining at least two substrates, which comprises: (a) forming an assembly comprising at least two substrates together with a sufficient bonding amount of an adhesive composition as claimed in any preceding claim; and (b) curing the adhesive.
Claim 16
Dependent Claim
28 words
The method of claim 13, wherein each substrate is independently textile, metal, plastic, glass fibre reinforced polyester composite, graphite, polyamide or a mixture of two or more thereof.
References Cited (Backward Citations)
No citation records indexed.
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