High molecuar weight styrenic block copolymer hot melt adhesive for toy articles
AssigneeMattel, Inc.
InventorAbimael Cordova
Life of this patent
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Abstract
This invention relates to high bonding hot melt adhesive compositions comprising a high molecular weight polystyrene-ethylene/butylene-polystyrene (SEBS) block copolymer as the basic ingredient and articles constructed therefrom. This polymer is useful in a variety of hot melt adhesive applications for consumer product articles subject to hostile use environments such as toys and other play things.
Claims17
A hot melt adhesive composition having improved wet strength characteristics comprising a formulation having the following ingredients:
- a) from about 50% to about 98%, by weight of a high molecular weight elastomeric-styrene-ethylene-butylene-styrene (SEBS) copolymer;
- b) from about 1% to about 49%, by weight of another SEBS compatible elastomeric copolymer;
- (c) from about 0.50% to about 5%, by weight, of a tackifiing resin;
- (d) from about 0.50% to about 5%, by weight, of a plasticizer,
- wherein the ingredients total 100%, by weight, based on the weight of the entire adhesive composition, and wherein the hot melt adhesive composition has a viscosity of about 1,000 to about 50,000 cP at 180 degrees C. and a melting point of about 150 degrees C. to about 200.degrees C.
A toy article having laminate or affixture bondings of an adhesive comprising:
- (a) from about 50 percent to about 98 percent by weight of a base A-B-A block copolymer having a molecular weight greater than about 200,000, said block copolymer having polystyrene end blocks and a substantially unsaturated midblock;
- (b) from about 1 to about 49 percent by weight of another A-B-A compatible block copolymer;
- (c) from about 0.5 to 5 percent of a liquid plasticizer;
- and
- (d) from about 0.50 to 5 percent by weight of solid tackifing agent.
A toy article having laminate or affixture bondings of an adhesive comprising:
- (a) about 50 percent to about 98% percent by weight of an A-B-A block copolymer having a molecular weight greater than about 200,000, said block copolymer having polystyrene end blocks and a substantially unsaturated midblock copolymer and selected from the group comprising styrene butadiene rubber (SBR), styrene-butadiene-styrene (S-B-S), and styrene-ethylene-butylene styrene (SEBS) elastomeric block copolymers;
- (b) from about 1 to 48 percent by weight of another compatible block copolymer;
- in which the B segment of the A-B-A copolymer is selected from the group consisting essentially of polyethylene, polypropylene, polybutylene, isoprene, and combinations thereof;
- (c) from about 0.5 to 5 percent of a liquid plasticizer;
- (d) from about 0.5 to 5 percent by weight of a tackifing agent.
Dependencies are inferred from the claim text.