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

• Main Authors: SOUTHWICK, JEFFREY, G, VERMUNICHT, GEERT, E., A, VAN DE VLIET, BIRGITTE, M., L
• Format: Patent
• Language: English; French
• Published: 02.10.2003
• 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. L'invention concerne un polymère poly(styrène-butadiène-styrène) à teneur élevée en vinyle dans le bloc butadiène, qui comprend en combinaison une teneur en polystyrène (PSC) située dans la plage comprise entre 15 et 20 % en poids; une efficacité de couplage (CE) comprise entre 50 et 80 %; un poids moléculaire (MW) d'étape 1 compris entre 9000 et 10000 kg/mol; et une teneur en vinyle comprise entre 20 et 45 %. L'invention concerne également des compositions d'adhésif thermofusible comprenant ledit polymère SBS avec une résine gluante, un plastifiant et un antioxydant.