Moisture-curable polyurethane hot melt adhesive composition with oleic chemical resistance
AssigneeHenkel AG & Co. KGaA
InventorsYizhong Luo, Junjun Wu
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Abstract
A moisture-curable polyurethane hot melt adhesive composition having good oleic acid resistance, especially when exposed to 100% pure oleic acid under aging condition of 65° C. and 90% relative humidity, wherein the adhesive composition comprises, consists essentially of or consists of a moisture-curable polyurethane prepolymer, the prepolymer being a reaction product of at least one amorphous polyester polyol containing an aromatic group and at least one polyisocyanate, preferably at least one polyisocyanate containing an aromatic group, wherein the aromatic group is comprised in the polyurethane prepolymer in a content of no less than 23 wt. %, preferably no less than 25 wt. %, more preferably no less than 30 wt. %.
Claims20
A moisture-curable polyurethane hot melt adhesive composition comprising:
- a polyurethane prepolymer,
- wherein the polyurethane prepolymer is a reaction product of (i) at least two amorphous polyester polyols comprising an aromatic group and (ii) at least one polyisocyanate comprising an aromatic group,
- wherein the polyurethane prepolymer comprises an aromatic group content greater than 30 wt. %, based on the total weight of the at least two amorphous polyester polyols and the at least one polyisocyanate, and
- wherein the at least two amorphous polyester polyols as a whole have a glass transition temperature greater than −16° C. with a first amorphous polyester polyol having a glass transition temperature of from about 30° C. to about 60° C. and a second amorphous polyester polyol having a glass transition temperature of less than 10° C.
A moisture-curable polyurethane hot melt adhesive composition comprising:
- a polyurethane prepolymer,
- wherein the polyurethane prepolymer is a reaction product of (i) amorphous hexanediol phthalate polyester diol, (ii) at least one amorphous polyester polyol comprising an aromatic group, and (iii) methylene diphenyl diisocyanate,
- wherein the polyurethane prepolymer comprises an aromatic group content greater than 30 wt. %, based on the total weight of the amorphous hexanediol phthalate polyester diol, the at least one amorphous polyester polyol comprising the aromatic group, and the methylene diphenyl diisocyanate,
- wherein the at least one amorphous polyester polyol has a glass transition temperature of from about 30° C. to about 60° C., and
- wherein the amorphous hexanediol phthalate polyester diol and the at least one amorphous polyester polyol as a whole have a glass transition temperature greater than −16° C.
Dependencies are inferred from the claim text.