C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
154/141, 400/303
C09J 121/00 (2006.01) A61F 13/15 (2006.01) A61L 15/58 (2006.01) C09J 153/02 (2006.01)
Patent
CA 2002358
Composite articles such as disposable diaper are made more efficiently through the use of a single hot melt adhesive composition having sufficient resistance to creep, sufficiently high bond strength, and a viscosity that is controllable through a range permitting it to be used for elastic attachment and in fine line, multi-line extrusion or sprayed adhesive preparation techniques. The adhesive composition in one embodiment comprises (a) 5 to 14 wt-% of a radial block copolymer having a molecular weight of at least 145,000 having the formula: (A--B)n--Y wherein Y is a multivalent coupling agent, A comprises a polyvinyl substituted aromatic block, B comprises a polymeric rubbery midblock, and n comprises an integer of at least 3; (b) about 45 to 85 wt-% of a compatible tackifying agent selected from the group consisting of C5 resin, a styrenated C5 resin, a styrenated terpene resin, a hydrogenated C9 resin, a resin derivative, a styrenated terpene resin and mixtures thereof; and (c) about 5 to 35 wt-% of a plasticizing oil; wherein the hot melt pressure sensitive adhesive has a static shear at 100°F of at least 30 min., a creep resistance at 100°F of less than about 30% and exhibits a viscosity of less than 25,000 cP at 275°F.
Bunnelle William L.
Malcolm David B.
Cassan Maclean
H.b. Fuller Licensing & Financing Inc.
LandOfFree
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