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US 5,204,390 AGranted
Hot melt adhesive resistant to ultraviolet light-induced degradation and to plasticizer migration
AssigneeH.B. Fuller Company
InventorsJames P. Szymanski, Eugene R. Simmons, Jeffrey S. Lindquist
Life of this patent
Estimating the term…
Abstract
The invention relates to a PSA hot melt composition that exhibits adhesive stability when exposed to ultraviolet light and is stable when contacted with plasticized surfaces.
Claims19
A hot melt pressure-sensitive adhesive PSA composition comprising:
- (a) about 1-75 wt-% of a substantially saturated thermoplastic resin having a molecular weight of up to about 200,000;
- (b) about 1-75 wt-% of a hydrocarbon resin;
- and
- (c) about 10-50 wt-% of a plasticizer comprising an end-capped reaction product of a polybutene polymer having a molecular weight of up to about 5,000 and terminal ethylenic unsaturation, and a compound that can react with an ethylenically unsaturated group;
- wherein the plasticizer, thermoplastic resin and hydrocarbon resin cooperate to significantly stabilize the adhesive against UV radiation and the adhesive exhibits stable adhesive properties upon exposure to UV radiation and is resistant to migration of plasticizer, when adhered to a surface.
2 more elements
A hot melt pressure-sensitive adhesive composition comprising:
- (a) about 10-60 wt-% of a mixture of about 20 to 90 wt-% of an AB block copolymer and about 10 to 80 wt-% of an ABA block copolymer, wherein A comprises a polystyrene block and B comprises an ethylene butylene rubbery midblock, each copolymer having a molecular weight of about 40,000-170,000;
- (b) about 10-50 wt-% of a plasticizer comprising an end-capped reaction product between a polyisobutylene polymer having a molecular weight of up to about 5,000 and an epoxidizing agent;
- wherein the plasticizer, thermoplastic resin and hydrocarbon resin cooperate to significantly stabilize the adhesive against UV radiation and the adhesive exhibits stable adhesive properties upon exposure to UV radiation and is resistant to migration of plasticizer, when adhered to a surface.
The hot-melt pressure-sensitive adhesive composition comprising:
- (a) about 10-40 wt-% of a mixture of an AB block copolymer and an ABA block copolymer wherein A is a polystyrene block and B is an ethylene butylene rubbery midblock wherein the mixture contains about 50-80 wt-% of the AB polymer and 20-50 wt-% of the ABA polymer;
- (b) about 10-40 wt-% of a hydrogenated hydrocarbon;
- (c) about 14-45 wt-% of a plasticizer comprising the end-capped reaction produce between a polyisobutylene polymer having a molecular weight of about 500 to 5,000, and an epoxidizing agent that can react with the ethylenically unsaturated group to produce a oxirane group;
- and
- (d) about 0.01 to about 2 wt-% of stabilizing moisture comprising a UV absorber and a thermal antioxidant;
- wherein the plasticizer, thermoplastic resin and hydrocarbon resin cooperate to significantly stabilize the adhesive against UV radiation and the adhesive exhibits stable adhesive properties upon exposure to UV radiation and is resistant to migration of plasticizer, when adhered to a surface.
3 more elements
Dependencies are inferred from the claim text.