초록 ▼

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 util

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.

대표청구항 ▼

What is claimed: 1. 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

What is claimed: 1. 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. 2. The hot melt pressure sensitive adhesive of claim 1 wherein said isoparaffinic oil has a glass transition temperature at or below about-80�� C. for amorphous components in said isoparaffinic oil. 3. The hot melt pressure sensitive adhesive of claim 1 wherein said isoparaffinic oil has a weight average molecular weight of about 390 to about 470. 4. The hot melt pressure sensitive adhesive of claim 1 wherein a carbon-13 nmr spectra of said isoparaffinic oil shows substantially all aliphatic carbon atoms. 5. The hot melt pressure sensitive adhesive of claim 1 wherein said isoparaffinic oil has: a glass transition temperature at or below about-75�� C. for amorphous components in said isoparaffinic oil; a weight average molecular weight of about 390 to 470; and a carbon-13 nmr spectra of said isoparaffinic oil shows substantially all aliphatic carbon atoms. 6. The hot melt pressure sensitive adhesive of claim 5 wherein said glass transition temperature is at or below about-80�� C. for amorphous components in said isoparaffinic oil. 7. The hot melt pressure sensitive adhesive of claim 1 further comprising up to about 2.0% by weight of at least one stabilizer. 8. The hot melt pressure sensitive adhesive of claim 7 further comprising up to about 10% by weight of at least one filler or wax. 9. The hot melt pressure sensitive adhesive of claim 1 additionally comprising at least one additional oil, said oil being a naphthenic oil, a paraffinic oil, a phthalate or adipate ester, an oligomer of polypropylene, a polybutene, a polyisoprene, a hydrogenated polyisoprene or polybutadiene, a benzoate ester, a vegetable oil or an animal oil. 10. The hot melt pressure sensitive adhesive of claim 8 wherein said wax is a paraffin wax, a microcrystalline wax, a Fischer-Tropsch wax, a polyethylene wax, an ethylene vinyl acetate wax, an oxidized polyethylene wax, a hydrogenated castor oil wax, or mixtures thereof. 11. The hot melt pressure sensitive adhesive of claim 1 wherein said isoparaffinic oil has a Cp value of greater than about 75%, a flash point of greater than 240�� C., and a pour point of less than about-15�� C. 12. The hot melt pressure sensitive adhesive of claim 1 wherein said tackifying resin comprises at least one of aliphatic petroleum resins or the hydrogenated derivatives thereof, aromatic petroleum resins or the hydrogenated derivatives thereof, aliphatic/aromatic petroleum resins or the hydrogenated derivatives thereof, hydrocarbon resins, styrene resins, alpha-methyl styrene resins, polyterpene resins, copolymers and terpolymers of natural terpene resins, pentaerythritol esters of wood, gum, and tall-oil rosins, glycerol esters of wood, gum, and tall-oil rosins, or mixed esters of rosins. 13. The hot melt pressure sensitive adhesive of claim 7 wherein the stabilizer is an antioxidant. 14. The hot melt pressure sensitive adhesive of claim 13 wherein the antioxidant is a hindered phenol or a phosphite. 15. The hot melt pressure sensitive adhesive of claim 1 wherein said isoparaffinic oil has a Chemical Abstracts number of 72623-87-1. 16. 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.