Moisture-curable hot melt adhesive
AssigneeHenkel AG & Co. KGaA
InventorsKenji Matsuda, Ai Takamori, Tsuyoshi Tamogami
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Abstract
The object of the present invention is to provide a moisture-curable hot melt adhesive having high initial adhesive strength, long open time, excellent coating property and reduced stringing property. The present invention relates to a moisture-curable hot melt adhesive comprising (A) a urethane prepolymer having a terminal isocyanate group, (B) a metallocene-based polyolefin having a viscosity of 10,000 mPa·s or less at a temperature of 170° C. and (C) a polyester-polyether copolymer.
Claims13
A moisture-curable hot melt adhesive comprising, based on 100 parts by total weight of adhesive:
- (A) 20 to 50 parts by weight of a urethane prepolymer having a terminal isocyanate group, the urethane prepolymer being a reaction product of a mixture comprising a polyisocyanate, a polyether polyol and a polyester polyol,
- (B) 2 to 15 parts by weight of a metallocene-based polyolefin having a viscosity of 10,000 mPa·s or less at a temperature of 170° C., and
- (C) 2 to 20 parts by weight of a polyester-polyether block copolymer comprising a polybutylene terephthalate segment;
- and a segment selected from polytetramethylene glycol, and
- (D) 4 to 12 parts by weight of an ethylene/carboxylic acid ester copolymer comprising an ethylene vinyl acetate copolymer.
A moisture-curable hot melt adhesive comprising, based on 100 parts by total weight of adhesive:
- (A) 20 to 50 parts by weight of a urethane prepolymer having a terminal isocyanate group, the urethane prepolymer being a reaction product of a mixture comprising a polyisocyanate, a polyether polyol and a polyester polyol,
- (B) 2 to 15 parts by weight of a metallocene-based polyolefin having a viscosity of 10,000 mPa·s or less at a temperature of 170° C., and
- (C) to 20 parts by weight of a polyester-polyether copolymer having a chemical structure comprising
- wherein n denotes an integer and is preferably 20 to 1,000;
- and
- wherein p is an integer of 2 to 5, q is an integer of 2 to 200, and m is an integer of 1 to 200, and
- (D) 4 to 12 parts by weight of an ethylene/carboxylic acid ester copolymer.
Dependencies are inferred from the claim text.