Claims
- 1. A hot melt construction adhesive useful for the manufacture of disposable consumer articles, comprising:a blend of a linear styrene-butadiene A-B-A-B-A multi-block copolymer containing at least about 25 weight percent styrene and a linear styrene-isoprene A-B-A tri-block copolymer containing at least about 25 weight percent styrene; at least one tackifying resin; and at least one plasticizer; wherein said hot melt construction adhesive possesses a viscosity no greater than about 25,000 mPa·s at about 140° C., a shear adhesion failure temperature of at least about 60° C., and a static shear time to failure of no less than about 25 hours at about 23° C.
- 2. The hot melt construction adhesive of claim 1 wherein the styrene-butadiene multi-block copolymer to styrene-isoprene tri-block copolymer ratio is from about 3:1 to about 1:3.
- 3. The hot melt construction adhesive of claim 1 wherein the styrene-butadiene multi-block copolymer contains from about 25 to about 50 weight percent styrene and possesses a melt flow index of from about 3 to about 50.
- 4. The hot melt construction adhesive of claim 1 wherein the styrene-isoprene-styrene tri-block copolymer contains from about 25 to about 50 weight percent styrene and possesses a melt flow index of from about 3 to about 50.
- 5. The hot melt construction adhesive of claim 1 wherein the linear styrene-isoprene tri-block copolymer contains less than about 25 weight percent diblocks.
- 6. The hot melt construction adhesive of claim 1 possessing 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 120 hours at about 23° C.
- 7. The hot melt construction adhesive of claim 1 wherein the tackifying resin represents from about 40 to about 65 parts by weight of the adhesive.
- 8. The hot melt construction adhesive of claim 1 wherein the tackifying resin is selected from the group consisting of aliphatic petroleum resins and the hydrogenated derivatives thereof, aromatic petroleum resins and the hydrogenated derivatives thereof, aliphatic/aromatic petroleum resins and 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, mixed esters of rosins and mixtures thereof.
- 9. The hot melt construction adhesive of claim 7 wherein the plasticizer represents from about 10 to about 30 parts by weight of the adhesive.
- 10. The hot melt construction adhesive of claim 1 wherein the plasticizer is selected from the group consisting of napthenic oil, paraffinic oil, phthalate and adipate esters, oligomers of polypropylene, polybutenes, polyisoprene, hydrogenated polyisoprene and polybutadiene, benzoate esters, vegetable and animal oils and mixtures thereof.
- 11. The hot melt construction adhesive of claim 1 further comprising a wax.
- 12. The hot melt construction adhesive of claim 11 wherein the wax represents from 0 to about 10 parts by weight of the adhesive.
- 13. The hot melt construction adhesive of claim 11 wherein the wax is selected from a group consisting of paraffin wax, microcrystalline wax, Fischer-Tropsch wax, polyethylene wax, ethylene vinyl acetate wax, oxidized polyethylene wax, hydrogenated castor oil wax and derivatives thereof, polypropylene wax and mixtures thereof.
- 14. The hot melt construction adhesive of claim 1 further comprising a stabilizer.
- 15. The hot melt construction adhesive of claim 14 wherein the stabilizer represents from 0 to about 2.0 parts by weight of the adhesive.
- 16. The hot melt construction adhesive of claim 14 wherein the stabilizer is selected from the group consisting of a hindered phenol and a phosphite.
- 17. A hot melt construction adhesive useful for the manufacture of disposable consumer articles, comprising:about 5 parts to about 20 parts by weight of a linear styrene-butadiene A-BA-B-A-multi-block copolymer containing at least about 25 weight percent styrene; about 5 parts to about 20 parts by weight of a linear styrene-isoprene A-B-A tri-block copolymer containing at least about 25 weight percent styrene; about 40 to about 65 parts by weight of at least one tackifying resin; about 10 parts to about 30 parts by weight of at least one plasticizer; 0 to about 10 parts by weight of at least one wax; and 0 parts to about 2.0 parts by weight of at least one stabilizer; wherein said hot melt construction adhesive possesses 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.
- 18. A hot melt construction adhesive useful for the manufacture of disposable consumer articles, comprising:about 5 to about 15 parts by weight of a linear styrene-butadiene A-B-A-B-A multi-block copolymer containing from about 35 to about 45 weight percent styrene and possessing a melt flow index of from about 10 to about 20; about 5 to about 15 parts of a linear styrene-isoprene A-B-A tri-block copolymer containing from about 35 to about 45 weight percent styrene and possessing a melt flow index of from about 30 to about 50 and less than about 10 weight percent diblock content; about 40 to about 70 parts of a hydrogenated aliphatic-aromatic tackifying resin; about 10 to about 30 parts of a paraffinic oil; 0 to about 10 parts of an oxidized polyethylene wax; and about 0.25 to about 2.0 parts by weight stabilizer wherein the hot melt construction adhesive possesses a viscosity of no greater than about 6,000 mPa·s at 140° C., a shear adhesion failure temperature of at least about 65° C., and a static shear time to failure of at least about 120 hours at about 23° C.
- 19. A process for bonding a first substrate comprising a polyolefin or nonwoven substrate to at least one second substrate comprising an elastic, polyolefin, foam, or nonwoven substrate, which comprises bonding the first substrate to the second substrate with the adhesive of claim 1.
Parent Case Info
This application claims priority to U.S. Provisional Application Ser. No. 60/067,529 filed on Dec. 4, 1997.
US Referenced Citations (38)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9611236 |
Apr 1996 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/067529 |
Dec 1997 |
US |