High flow, hydrogenated styrene-butadiene-styrene block copolymers and applications
The invention relates to unique applications for the novel high melt flow, low viscosity, selectively hydrogenated styrene-butadiene-styrene (hSBS) or selectively hydrogenated controlled distribution styrene-butadiene/styrene-styrene (hSBSS) block copolymers, wherein the melt flow rate of said block copolymer is at least 100 g/10 min. at 230° C. under 2.16 kg mass according to ASTM D1238. These block copolymers are novel and have the highest melt flow rate of any styrenic block copolymer also possessing high strength and elasticity. It has applications that prior to the present invention were not normally possible due to the normal low melt flow rate of styrenic block copolymers. The present invention also encompasses various fields of use such as a fiberglass hSBS or hSBSS reinforced mat, low viscosity hSBS or hSBSS coatings for industrial uses, hot melt adhesives prepared from hSBS or hSBSS blended with polyalpha-olefins, and elastic film, fiber, and nonwoven constructions using hSBS or hSBSS.
1. A textile comprising a laminating adhesive, wherein the laminating adhesive comprises a blend of:
a) a styrenic block copolymer, wherein the styrenic block copolymer is:
i) a selectively hydrogenated (SBS) styrene-diene-styrene block copolymer, or
ii) a selectively hydrogenated (S-EB/S-S) controlled distribution styrene-diene/styrene-styrene block copolymer, wherein the diene is butadiene, isoprene or a mixture thereof,
wherein said styrenic block copolymer has a melt flow rate equal to or greater than 125 g/10 min. measured at 230° C. with a 2.16 kg load, and
b) a tackifying resin.
2. The textile of claim 1 , wherein said styrenic block copolymer has a minimum linear true peak molecular weight (Mp) of about 45,000, a polystyrene content of between about 18 to about 45%, a vinyl content of about 65 to 80%, and a coupling efficiency of about 60 to about 97%, said blend having a melt flow rate greater than about 15 g/10 min. at 160° C. and 2.16 kg.
3. The textile of claim 1 , wherein said tackifying resin is present from about 5 to about 250 wt. parts per 100 wt. parts of said hydrogenated SBS.
4. The textile of claim 1 , wherein said tackifying resin is either partially or fully hydrogenated C9 resin.
5. The textile of claim 1 , wherein said tackifying resin is a rosin ester.
6. The textile of claim 1 , wherein said hydrogenated SBS has a polystyrene content of between about 18 to about 33%.
7. The textile of claim 1 , wherein said styrenic block copolymer has a structure of either sequential polymerization of each block polymer, or coupled polymerization wherein diblocks (S-EB or S-EB/S) are formed, and 2 or more diblocks are coupled together via a coupling agent.