STRETCH LAMINATES

摘要

Stretch laminate hot melt adhesives and stretch laminates are described. The stretch laminate hot melt adhesives are suitable for adhering elastic materials with inelastic substrates, and allow permanent deformation of the inelastic substrate and extensions and retractions of the elastic materials. The stretch laminate hot melt adhesive is particularly suitable for back ear lamination for disposable absorbent articles.

主权项

1. A stretch laminate comprising:
one or more substrates adhesively bonded to an elastic film by a hot melt adhesive; wherein the hot melt adhesive comprises:
a. about 35 to about 70 weight percent of a polypropylene copolymer having (i) a heat of fusion less than about 15 J/g measured at 10° C./min heating and cooling rate in accordance with ASTM D3418-12; (ii) a propylene content greater than 50% of the copolymer;b. about 2 to about 15 weight percent of a wax having (i) a heat of fusion greater than 50 J/g measured at 10° C./min heating and cooling rate in accordance with ASTM D3418-12, and (ii) a melting peak greater than 100° C. measured in accordance with ASTM D3418-12;c. a tackifierwherein the adhesive has (i) a storage modulus (G′40) of about 5×105 to about 5×107 Pascal at 40° C., 10 rad/s; (ii) a storage modulus (G′80) of about 5×103 to about 1×107 Pascal at 80° C., 10 rad/s; and (iii) a density range of about 0.75 to about 0.90 g/cm3 at 160° C. measured in accordance with ASTM D1475.