Low application temperature elastic attachment adhesive

Abstract

Low application temperature thermoplastic hot melt adhesives are particularly useful as elastic attachment adhesives. The adhesives have a viscosity at 275° F. of less than about 8,000 cp, a yield stress of less than about than 80 psi and a creep performance for a bond made through strand coating of less than about 15%. Preferred are adhesives that have a creep performance for a bond made through spiral coating of less than about 25%.

1 . A low application temperature thermoplastic hot melt adhesive having a viscosity at 275° F. of less than about 8,000 centipose, a yield stress of less than about than 80 psi and a creep performance for a bond made through strand coating of less than about 15%.  
     
     
         2 . The adhesive of  claim 1  which has a creep performance for a bond made through spiral coating of less than about 25%.  
     
     
         3 . The adhesive of  claim 1  comprising an amount of an additive effective to lower viscosity, increase toughness, and increase tensile strength.  
     
     
         4 . The adhesive of  claim 3  which has a creep performance for a bond made through spiral coating of less than about 25%.  
     
     
         5 . The adhesive of  claim 1  or  2  which comprises from about 0.5 to about 55 wt % of a thermoplastic elastomer, from about 30 to about 90 wt % of a tackifying resin, from 0 to about 40 wt % of a diluent and from 0 to about 25 wt % of a wax.  
     
     
         6 . The adhesive of  claim 3  or  4  which comprises from about 0.5 to about 55 wt % of a thermoplastic elastomer, from about 30 to about 90 wt % of a tackifying resin, from 0 to about 40 wt % of a diluent, from 0 to about 25 wt % of a wax and up to about 40 wt % of said additive.  
     
     
         7 . The adhesive of  claim 6  wherein said additive is an ionomer resin.  
     
     
         8 . The adhesive of  claim 7  comprising from about 0.1 to about 40 wt % of said ionomer.  
     
     
         9 . The adhesive of  claim 8  comprising from about 0.1 to about 15 wt % of said ionomer.  
     
     
         10 . The adhesive of  claim 9  wherein the thermoplastic elastomer is styrene-isoprene-styrene, styrene-butadiene-styrene, styrene-b-ethylene/butylene-b-styrene or a mixture thereof.  
     
     
         11 . An article of manufacture comprising the adhesive of any one of  claims 1  to  4 .  
     
     
         12 . The article of  claim 11  which is a disposable absorbent article.  
     
     
         13 . The article of  claim 12  which is a disposable elastic article.  
     
     
         14 . The article of  claim 13  which is a diaper.  
     
     
         15 . The article of  claim 11  wherein the article of manufacture further comprises an elastomeric fiber selected from the group consisting of natural rubber, synthetic rubber, spandex, and melt-spun elastomers.  
     
     
         16 . The article of  claim 15  wherein the adhesive comprises from about 0.5 to about 55 wt % of a thermoplastic elastomer, from about 30 to about 90 wt % of a tackifying resin, from 0 to about 40 wt % of a diluent, from 0 to about 25 wt % of a wax and up to about 40 wt % of an additive.