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US 7,442,739 B1Granted
Hot melt pressure sensitive adhesives
AssigneeHenkel Corporation
InventorStephen F. Hatfield
Life of this patent
Estimating the term…
Abstract
The instant invention concerns hot melt pressure sensitive adhesives which comprise about 10 to about 50% by weight of at least one polymer; about 5 to about 50% of isoparaffinic oil; and about 30 to about 65% by weight of at least one tackifying resin. The invention also concerns products that utilize such adhesives.
Claims16
A hot melt pressure sensitive adhesive comprising:
- (a) about 10 to about 50% by weight of at least one polymer;
- (b) about 5 to about 50% by weight of isoparaffinic oil having a glass transition temperature at or below about −75° C. for amorphous components in said isoparaffinic oil and wherein a carbon-13 nmr spectra of said isoparaffinic oil shows greater than 95 molar percent aliphatic carbon atoms;
- and
- (c) about 30 to about 65% by weight of at least one tackifying resin.
1 more element
A hot melt construction adhesive comprising:
- (a) about 5 to about 20% by weight of a linear styrene-butadiene A-B-A-B-A multi-block copolymer containing at least about 25 weight percent styrene;
- (b) about 5 to about 20% by weight of a linear styrene-isoprene A-B-A tri-block copolymer containing at least about 25 percent by weight of styrene;
- (c) about 40 to about 65% by weight of at least one tackifying resin;
- (d) about 10 to about 30% by weight of isoparaffinic oil having a glass transition temperature at or below about −75° C. for amorphous components in said isoparaffinic oil and wherein a carbon-13 nm r spectra of said isoparaffinic oil shows greater than 95 molar percent aliphatic carbon atoms;
- (e) up to about 10% by weight of at least one wax;
- and
- (f) up to about 2.0% by weight of at least one stabilizer;
- said adhesive having a viscosity no greater than about 6,000 mPa·s at about 140° C., a shear adhesion failure temperature of at least about 65° C., and a static shear time to failure of no less than about 25 hours at about 23° C.
5 more elements
Dependencies are inferred from the claim text.