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US 8,076,407 B2Granted
Hot melt adhesive
AssigneeHenkel AG & Co. KGaA
InventorsRichard J. Ellis, Michaela Stolbova
Life of this patent
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Abstract
Hot melt adhesives are provided that have improved heat resistance. The adhesives comprise a metallocene polyolefin, an amorphous α-olefin polymer, a tackifier and a functional polyolefin. The functional polyolefin is used in an amount sufficient to increase the heat resistance. A preferred functional polyolefin is a maleated polyolefin such as maleated polypropylene. A preferred tackifier is a hydrogenated hydrocarbon tackifier.
Claims8
A hot melt adhesive consisting essentially of:
- (a) from 20 to 75 wt % of a mixture wherein the mixture comprises (i) from 10 to 50 wt % of a crystalline metallocene polypropylene copolymer component that has a viscosity range of about 60 to about 7000 cP at 170° C. and (ii) from 20 to 50 wt % of an amorphous α-olefin polymer component
- (b) from 0.1 to 15 wt % of a functionalized polyolefin;
- (c) from 20 to 60 wt % of a tackifier;
- (d) from 5 to 40 wt% of a wax that has a melt temperature between 49° C. and 121° C.;
- and
- (e) from 0.1 to 1.5 wt % of a stabilizer or antioxidant
- wherein the adhesive has a viscosity range of from about 700 cP to about 10,000 cP at 180° C. and the adhesive has a heat stress cleavage improvement of at least 10° C. over an adhesive without the functionalized polyolefin and wherein the wt % is based on the total weight of the adhesive.
4 more elements
Dependencies are inferred from the claim text.