Polyurethane hot melt adhesive composition, and preparation method thereof
AssigneeHenkel AG & Co. KGaA
InventorsWeihua Ye, Junjun Wu
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Abstract
The present invention provides a hotmelt adhesive composition, comprising (A) at least one polyurethane prepolymer obtained by reacting (A1) polyols comprising: (a) at least one polyester polyol, and (b) at least one polyether polyol, with (A2) at least one polyisocyanate having at least two isocyanate groups in one molecule; (B) at least one thermoplastic resin; and (C) at least one aspect ratio promoter in an amount of no more than 10% by weight based on the total weight of the composition.
Claims18
A polyurethane hot melt adhesive composition, comprising, based on the total weight of the composition:
- (A) at least one polyurethane prepolymer obtained by reacting:
- (A1) a polyol component comprising:
- (a) from 15 wt. % to 20 wt. % of at least one crystalline polyester polyol,
- (b) from 15 wt. % to 25 wt. % of at least one liquid polyester polyol, and
- (c) from 15 wt. % to 40 wt. % of at least one polyether polyol;
- and
- (A2) from 10 wt. % to 20 wt. % of at least one polyisocyanate having at least two isocyanate groups in one molecule;
- (B) from 5 wt. % to 20 wt. % of at least one thermoplastic resin;
- and
- (C) 3 wt. % of calcium carbonate.
A polyurethane hot melt adhesive composition, comprising, based on the total weight of the composition:
- (A) a polyurethane prepolymer obtained by reacting:
- (A1) a polyol component consisting of:
- (a) from 15 wt. % to 20 wt. % of a crystalline polyol,
- (b) from 15 wt. % to 25 wt. % of a liquid polyester polyol, and
- (c) from 15 wt. % to 40 wt. % of a polyether polyol;
- and
- (A2) from 10 wt. % to 20 wt. % of at least one polyisocyanate having at least two isocyanate groups in one molecule;
- (B) from 5 wt. % to 20 wt. % of at least one thermoplastic resin;
- (C) from 0.01 wt. % to 3 wt. % of an aspect ratio promoter comprising calcium carbonate;
- and
- (D) from 0.05 wt. % to 1 wt. % of a catalyst.
Dependencies are inferred from the claim text.