POLY (STYRENE-BUTADIENE-STYRENE) POLYMERS HAVING A HIGH VINYL CONTENT IN THE BUTADIENE BLOCK AND HOT MELT ADHESIVE COMPOSITIONS COMPRISING SAID POLYMERS

• Main Authors: JEFFREY, G. SOUTHWICK, GEERT, E., A. VERMUNICHT, BIRGITTE, M., L. VAN DE VLIET
• Format: Patent
• Language: English
• Published: 08.10.2003
• Edition: 7
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

The present invention concerns a poly(styrene-butadiene-styrene) polymer having a high vinyl content in the butadiene block comprising in combination a polystyrene content (PSC) within a range of 15-20 % by weight, a coupling efficiency (CE) of 50-80 %, a step I molecular weight (MW) between 9,000 and 10,000 kg/mol, and a vinyl content between 20-45 %. Hot melt adhesive compositions are also described comprising said SBS polymer together with a tackifying resin, a plasticizer and an anti-oxidant.