Moisture curable polyurethane adhesive composition
AssigneeHenkel AG & Co. KGaA
InventorsHongye Zhu, Dan Xie
Life of this patent
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Abstract
This invention relates to moisture curable polyurethane adhesive compositions and more particularly to moisture curable polyurethane adhesive compositions having improved initial tack and moisture permeability when cured. In one embodiment the disclosed moisture curable polyurethane adhesive compositions are suited for use as hot melt adhesives for use in manufacturing textile, clothing and/or footwear articles.
Claims18
A moisture curable polyurethane adhesive composition, comprising an isocyanate-functional polyurethane prepolymer which is the reaction product of a mixture, including:
- a) polyols comprising
- (a1) an amorphous polyester polyol having a crystallinity of less than 10% determined by DSC according to ISO 11357,
- (a2) a semi-crystalline polyester polyol having crystalline and non-crystalline regions and a crystallinity of 20% to 90%, determined by DSC according to ISO 11357, and
- (a3) a polyether polyol having an Mn in the range of 400 g/mol to 2500 g/mol, and
- b) a polyisocyanate;
- wherein the mixture contains less than 5% by weight of crystalline polyols based on the total weight of the moisture curable polyurethane adhesive composition.
A moisture curable, polyurethane hot melt adhesive composition, comprising an isocyanate-functional polyurethane prepolymer which is the reaction product of a mixture comprising:
- (a1) 5% to 35% by weight of an amorphous polyester polyol having an Mn in the range of 400 g/mol to 5000 g/mol and a crystallinity of less than 10%,
- (a2) 5% to 35% by weight of a semi-crystalline polyester polyol having crystalline and non-crystalline regions and an Mn in the range of 400 g/mol to 5000 g/mol and a crystallinity of at least 50 to less than 90%, and
- (a3) 20% to 70% by weight of a polyether polyol having an Mn in the range of 400 g/mol to 2500 g/mol, and
- b) 10% to 30% by weight of a polyisocyanate,
- wherein the mixture contains less than 5% by weight of crystalline polyols and in which the weight percentages are based on the total weight of the moisture curable polyurethane adhesive composition.
Dependencies are inferred from the claim text.