Styrenic block copolymer based hot-melt adhesives, their use for disposable soft goods, and tackifying resins contained therein
US6103814A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1997 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Apr 10, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.degree. 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: PA1 a tan .delta. value of 3.5 or less, wherein tan .delta. is defined as the ratio between the loss modulus and the storage modulus of said composition and PA1 an elastic retention on spandex fibers (300%) or natural latex rubber (200%) after 4 h at 40.degree. C. of 70% or more; and PA1 a crossover temperature of 95.degree. C. or less. 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.degree. 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.degree. C. or less; (d) a molecular weight (Mz) of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.