Low application temperature hot melt adhesive
View Patent ↗A low application temperature rubber-based hot melt adhesive having properties particularly well suited for use in the construction of disposable articles has been invented. The adhesive comprises a styrene block copolymer and a type of wax in an amount effective to produce a viscosity at 120° C. of below about 10,000 centipoises, a cube flow at 130° F. (54° C.) of less than about 300%, a DSC crystallization temperature of less than about 75° C. and a storage modulus of less than about 1.0×10 7 dynes/cm 2 at 10 rads/sec (25° C.).
1. A nonwoven article manufactured using a hot melt adhesive composition applied at a temperature of below 120° C., said adhesive composition comprising
a styrene block copolymer and
a type and amount of wax effective to produce an adhesive having a viscosity at 120° C. of below 10,000 centipoises, a cube flow at 54° C. of less than 300%, a DSC crystallization temperature of less than 75° C., and a storage modulus of less than 1.0×10 7 dynes/cm 2 at 10 rads/sec (25° C.),
wherein the styrene block copolymer is present in amounts of from 10 to 25 wt % and said effective amount of wax is less than 10 wt %.
2. The nonwoven article of claim 1 which is a nonwoven absorbent article.
3. The nonwoven article of claim 2 which is a nonwoven absorbent garment.
4. The nonwoven article of claim 1 which is a diaper.
5. The nonwoven article of claim 2 comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent structure positioned between the topsheet and the backsheet.
6. The nonwoven article of claim 1 wherein at least one of said topsheet or backsheet comprises polypropylene.
7. The nonwoven article of claim 1 wherein the adhesive comprises a mixture of waxes.
8. The nonwoven article of claim 1 wherein the adhesive comprises a SBS polymer, a SIS polymer, a SEBS polymer and/or a SEPS polymer.
9. The nonwoven article of claim 1 wherein the adhesive comprises where a SBS polymer.
10. The nonwoven article of claim 1 wherein the adhesive comprises a blend of SBS and SIS.
11. The nonwoven article of claim 1 wherein the adhesive further comprises from 40 to 70 wt % of a tackifier and from 15 to 30 wt % of a plasticizer.
12. The nonwoven article of claim 1 wherein the adhesive comprises a wax that has a melting point of greater than 165° F.
13. The nonwoven article of claim 12 wherein the adhesive comprises a wax that has a melting point of greater than 175° F.
14. The nonwoven article of claim 13 wherein the adhesive comprises a microcrystalline wax.
15. The nonwoven article of claim 14 wherein the adhesive comprises about 14 wt % of said styrene block copolymer and about 5 wt % of said wax.