Reactive hot melt adhesive composition and use thereof
AssigneeHenkel AG & Co. KGaA
InventorsHongye Zhu, Aifu Che
Life of this patent
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Abstract
The present invention relates to a reactive hot melt adhesive composition and the use thereof. In particular, the present invention provides an adhesive having excellent washing resistance, especially having excellent resistance to antibacterial laundry cleansers. In addition, the adhesive has very short open time and good softness upon curing.
Claims19
A reactive hot melt adhesive composition comprising at least one NCO-terminated polyurethane prepolymer, wherein the NCO-terminated polyurethane prepolymer comprises the reaction product of a mixture comprising:
- at least one polyisocyanate;
- at least one polytetrahydrofuran;
- and
- at least one polyol different from the at least one polytetrahydrofuran and not including a polyester polyol, wherein:
- a molar ratio of the NCO group of the at least one polyisocyanate to the total OH groups of the at least one polytetrahydrofuran and the at least one polyol is from about 1.5 to about 2.5, and
- the at least one polytetrahydrofuran is in an amount of from about 20% to about 60% by weight, based on the total weight of the NCO-terminated polyurethane prepolymer.
A reactive hot melt adhesive composition comprising at least one NCO-terminated polyurethane prepolymer, wherein the NCO-terminated polyurethane prepolymer comprises the reaction product of a mixture comprising:
- 4′4-methylene diphenyl diisocyanate in an amount of from 15% to about 35% by weight, based on the total weight of the NCO-terminated polyurethane prepolymer;
- polytetrahydrofuran in an amount of from about 20% to about 60% by weight, based on the total weight of the NCO-terminated polyurethane prepolymer;
- and
- at least one polyol in an amount of from about 1.2% to about 4% by weight, based on the total weight of the NCO-terminated polyurethane prepolymer, the at least one polyol being selected from polyether polyols other than polytetrahydrofuran, polyester polyols, and any combination thereof, wherein:
- a molar ratio of the NCO group of the 4′4-methylene diphenyl diisocyanate to the total OH groups of the polytetrahydrofuran and the at least one polyol is from about 1.5 to about 2.5, and
- the amount of the NCO group is from about 1.2% to about 4% by weight, based on the total weight of the NCO-terminated polyurethane prepolymer.
Dependencies are inferred from the claim text.