| abstract |
1515240 Radial block butadiene/styrene copolymer compositions ABBOTT LABORATORIES 25 Aug 1976 [26 Aug 1975] 35416/76 Headings C3M and C3R Compositions having high clarity and resealability comprise (1) 10-90% butadiene/ styrene radial block copolymer of 85-60% butadiene and 15-40% styrene, (2) 90-10% butadiene/styrene radial block copolymer having a different butadiene content of 85-60% and a different styrene content of 15-40% and (3) 5-75% based on the block copolymers of clear polymeric material selected from acrylics, thermoplastic epoxies, styrene/acrylonitrile copolymers, polycarbonates, polyolefins, polyesters, polyvinyl chloride, olefin/vinyl chloride copolymers, polyether and polyester urethanes, methacrylate acrylonitrile styrene/butadiene and methacrylate/styrene/butadiene copolymers. Exemplified compositions comprise radial block copolymers and butadiene/styrene/methyl methacrylate copolymer and/or thermoplastic polyether polyurethane, polyester urethane or butadiene/styrene/methyl methaerylate/acrylonitrile. The compositions may be moulded into medical plastic products such as containers, seals, closures, tubing and syringe plunger tips. |