US4775719A — Thermally stable hot melt moisture-cure polyureth…

Claim 1

Independent Claim 187 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 cure polyurethane bond, which comprises: (a) an effective green bonding amount of a film-forming thermoplastic ethylene-vinyl monomer copolymer wherein the vinyl monomer comprises an acrylate monomer or a vinyl ester of a carboxylic acid compound; (b) an effective 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 having an isocyanate functionality of about 2 or more at a ratio of hydroxyl groups to isocyanate groups of 0.1 to 0.7:1, sufficient to form a rigid moisture-cure bond; (c) a phenol-free, aromatic or aliphatic-aromatic polymer tackifier comprising a monomer selected from the group consisting of a C 4-6 diene, a styrenic monomer, an indene monomer, dicyclopentadiene, and mixtures thereof; and (d) about 0 to 5 wt-% of an antioxidant.

Claim 2

Dependent Claim 187 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 cure polyurethane bond, which comprises: (a) an effective green bonding amount of a film-forming thermoplastic ethylene-vinyl monomer copolymer wherein the vinyl monomer comprises an acrylate monomer or a vinyl ester of a carboxylic acid compound; (b) an effective 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 having an isocyanate functionality of about 2 or more at a ratio of hydroxyl groups to isocyanate groups of 0.1 to 0.7:1, sufficient to form a rigid moisture-cure bond; (c) a phenol-free, aromatic or aliphatic-aromatic polymer tackifier comprising a monomer selected from the group consisting of a C 4-6 diene, a styrenic monomer, an indene monomer, dicyclopentadiene, and mixtures thereof; and (d) about 0 to 5 wt-% of an antioxidant.

Claim 3

Dependent Claim 26 words

The composition of claim 1 wherein the ethylene-vinyl monomer copolymer comprises an ethylene vinyl acetate copolymer having an ethylene content of about 10 to 55 wt-%.

Claim 4

Dependent Claim 18 words

The composition of claim 2 wherein the ethylene-vinyl acetate copolymer has about 45 to 60 wt-% vinyl acetate.

Claim 5

Dependent Claim 41 words

The composition of claim 3 wherein the ethylene-vinyl acetate copolymer has a vinyl acetate concentration of 50 to 60 wt-%, a melt index of about 2-90, and is present in the adhesive composition at a concentration of 15 to 35 wt-%.

Claim 6

Dependent Claim 31 words

The composition of claim 1 wherein the prepolymer is the reaction product of a polyalkylene glycol and an aromatic polyfunctional isocyanate compound having an isocyanate functionality of about two or more.

Claim 7

Dependent Claim 65 words

The composition of claim 5 wherein the polyalkylene glycol is an alkylene oxide capped polypropylene glycol, the aromatic polyfunctional isocyanate compound having an isocyanate functionality of about 2 or more is diphenyl methane 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 33 words

The composition of claim 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 34 words

The composition of claim 1 wherein the tackifier is a styrenic copolymer comprising one or more styrenic monomers selected from the group consisting of styrene, alpha-methylstyrene, vinyl toluene, methoxystyrene, tertiary butyl styrene, and chlorostyrene.

Claim 10

Dependent Claim 45 words

The composition of claim 1 wherein the tackifier is a styrene homopolymer, an alpha-methylstyrene homopolymer, or a styrenic copolymer comprising one or more styrenic monomers selected from the group consisting of styrene and alpha-methylstyrene and one or more aliphatic C 4-6 monomers with conjugated diunsaturation.

Claim 11

Dependent Claim 119 words

An adhesive having both hot melt and thermosetting urethane adhesive properties which comprises: (a) about 10 to 50 wt-% of an ethylene vinyl acetate copolymer having a melt index of 2-90 and a vinyl acetate content of greater than 50 wt-%; (b) about 20 to 60 wt-% of polyurethane prepolymer comprising the reaction product of a polypropylenediol and diphenyl methane diisocyanate at a ratio of hydroxyl groups to isocyanate groups of about 0.2-0.5:1, having a viscosity of less than 10,000 cP at 25° C.; (c) about 10 to 60 wt-% of a polymeric tackifying resin comprising a styrenic polymer compound selected from the group consisting of polystyrene and poly-alpha-methylstyrene; and (d) about 10 to 60 wt-% of an antioxidant.

Claim 12

Dependent Claim 119 words

An adhesive having both hot melt and thermosetting urethane adhesive properties which comprises: (a) about 10 to 50 wt-% of an ethylene vinyl acetate copolymer having a melt index of 2-90 and a vinyl acetate content of greater than 50 wt-%; (b) about 20 to 60 wt-% of polyurethane prepolymer comprising the reaction product of a polypropylenediol and diphenyl methane diisocyanate at a ratio of hydroxyl groups to isocyanate groups of about 0.2-0.5:1, having a viscosity of less than 10,000 cP at 25° C.; (c) about 10 to 60 wt-% of a polymeric tackifying resin comprising a styrenic polymer compound selected from the group consisting of polystyrene and poly-alpha-methylstyrene; and (d) about 10 to 60 wt-% of an antioxidant.

Claim 13

Dependent Claim 17 words

The adhesive of claim 10 wherein the viscosity of the prepolymer is 2,000-6,000 cP at 25° C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-10-04	1992-04-04	1992-10-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-10-04	1996-04-04	1996-10-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-10-04	2000-04-04	2000-10-04	$7700.00	Window Closed / Lapsed

Thermally stable hot melt moisture-cure polyurethane adhesive composition

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