Styrenic block copolymer based hot-melt adhesives, their use for disposable soft goods, and tackifying resins contained therein

摘要

Disclosed are hot-melt adhesive compositions suitable for the manufacture of soft goods. They have a melt viscosity of 60,000 mPa.s or less at a temperature of 120° C. and include: (a) 50 to 150 parts by weight of a styrenic block copolymer or mixtures and/or modified and/or hydrogenated derivatives thereof; (b) 20 to 450 parts by weight of a tackifying resin which, when incorporated into a reference composition, leads to the following properties:PPa tan &dgr; value of 3.5 or less, wherein tan &dgr; is defined as the ratio between the loss modulus and the storage modulus of said composition andP P an elastic retention on spandex fibers (300%) or natural latex rubber (200%) after 4 h at 40° C. of 70% or more; andP Pa crossover temperature of 95° C. or less.PP Further disclosed are novel partially hydrogenated hydrocarbon resins which are useful as tackifying resins and have the following properties: (a) a R & B softening point (R & B) of 50° C. to 150. degree. C.; (b) a mixed methylcyclohexane aniline cloudpoint (MMAP) of 10. degree. C. to 75. degree. C.; (c) a Di-Acetone Alcohol cloudpoint (DACP) of 35° C. or less; (d) a molecular weight (Mz) of 10,000 Dalton or less; and (e) a UV absorbance at 268 nm ranging from 2.0 to 5.0.