Styrenic block copolymer based hot-melt adhesives, their use for disposable soft goods, and tackifying resins contained therein
First Claim
1. A hot-melt adhesive composition which comprises:
- (a) about 50 to about 150 parts by weight of a styrenic block copolymer;
(b) about 20 to about 450 parts by weight of a tackifying resin which, when incorporated into a reference composition consisting of 100 parts by weight of a styrene-isoprene-styrene copolymer having a styrene content of about 20 to 30% by weight, 250 parts by weight of said tackifying resin, 50 parts by weight of a paraffinic/napthenic (70/30 weight/weight) extender oil and 2 parts by weight of a stabilizer consisting essentially of pentaerythrityl-tetrakis[3-(3,5-di-tert.butyl-4-hydroxyphenyl)-propionate], leads to the following properties of said reference composition;
a melt viscosity of about 60,000 mPa.s or less at a temperature of about 120°
C.;
a tan δ
value of about 3.5 or less, wherein tan δ
is defined as the ratio between the loss modulus (G") and the storage modulus (G'"'"') of said composition;
an elastic retention on natural latex rubber (200%) after 4 h at about 40°
C. of about 70% or more; and
a crossover temperature between G'"'"' and G" (tan δ
=1) of about 95°
C. or less,wherein G" and G'"'"' of said composition are determined on a Rheometrics Mechanical Spectrometer (RDS-II) using 8 mm circular shaped parallel plates with a 2 mm gap distance over a temperature range from about -60°
C. up to about 140°
C. and a frequency of 10 radians/sec.
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Accused Products
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° 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:
a tan δ value of 3.5 or less, wherein tan δ is defined as the ratio between the loss modulus and the storage modulus of said composition and
an elastic retention on spandex fibers (300%) or natural latex rubber (200%) after 4 h at 40° C. of 70% or more; and
a crossover temperature of 95° 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° C. to 150° C.; (b) a mixed methylcyclohexane aniline cloudpoint (MMAP) of 10° C. to 75° 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.
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Citations
33 Claims
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1. A hot-melt adhesive composition which comprises:
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(a) about 50 to about 150 parts by weight of a styrenic block copolymer; (b) about 20 to about 450 parts by weight of a tackifying resin which, when incorporated into a reference composition consisting of 100 parts by weight of a styrene-isoprene-styrene copolymer having a styrene content of about 20 to 30% by weight, 250 parts by weight of said tackifying resin, 50 parts by weight of a paraffinic/napthenic (70/30 weight/weight) extender oil and 2 parts by weight of a stabilizer consisting essentially of pentaerythrityl-tetrakis[3-(3,5-di-tert.butyl-4-hydroxyphenyl)-propionate], leads to the following properties of said reference composition; a melt viscosity of about 60,000 mPa.s or less at a temperature of about 120°
C.;a tan δ
value of about 3.5 or less, wherein tan δ
is defined as the ratio between the loss modulus (G") and the storage modulus (G'"'"') of said composition;an elastic retention on natural latex rubber (200%) after 4 h at about 40°
C. of about 70% or more; anda crossover temperature between G'"'"' and G" (tan δ
=1) of about 95°
C. or less,wherein G" and G'"'"' of said composition are determined on a Rheometrics Mechanical Spectrometer (RDS-II) using 8 mm circular shaped parallel plates with a 2 mm gap distance over a temperature range from about -60°
C. up to about 140°
C. and a frequency of 10 radians/sec. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A partially hydrogenated hydrocarbon resin having the following properties:
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(a) a Ring &
Bell softening point of about 50°
C. to about 150°
C.;(b) a mixed methylcyclohexane aniline cloudpoint (MMAP) of about 10°
C. to about 75°
C.;(c) a Di-Acetone Alcohol cloudpoint (DACP) of about 35°
C. or less;(d) a z-average molecular weight (Mz) of about 10,000 Dalton or less; and (e) a UV absorbance at 268 nm ranging from about 2.0 to about 5.0. - View Dependent Claims (29, 30, 31)
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32. A process for preparing a partially hydrogenated hydrocarbon resin comprising the following steps:
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(a) providing an unsaturated aromatic feedstream predominantly containing monomers having about 7 to about 10 carbon atoms; (b) polymerizing the unsaturated aromatic feedstream through Friedel-Crafts polymerization to form a polymerized feedstream; and (c) partially hydrogenating the polymerized feedstream to produce a partially hydrogenated hydrocarbon resin wherein the partially hydrogenated hydrocarbon resin has the following properties; (i) a Ring and Ball softening point of about 50°
C. to about 150°
C.;(ii) a mixed methylcyclohexane aniline cloudpoint (MMAP) of about 10°
C. to about 75°
C.;(iii) a Di-Acetone Alcohol cloudpoint (DACP) of about 35°
C. or less;(iv) a z-average molecular weight (Mz) of about 10,000 Dalton or less; and (v) a UV absorbance at 268 nm ranging from about 2.0 to about 5.0. - View Dependent Claims (33)
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Specification