| 摘要 |
<p>Radial block copolymers are mechanically combined with additional polymeric materials to form plastic compositions having a high degree of clarity so that they can be substituted for polyvinylchloride plastic compositions in the fabrication of such devices as intravenous and blood tubing, containers for intravenous solutions and blood fractions, functional parts of intravenous administration equipment such as sight and drip chambers, needle adapters and miscellaneous assemblies for contact with intravenous fluids. The compounds of this invention can also be utilized for catherization, bodily drainage systems, and as pharmaceutical closures, resealable injection sites and syringe plunger tips. The compositions comprise (a) at lease about 10% by weight of a butadiene-styrene radial block copolymer having a butadiene content in the range of about 85% - 60% by weight and butadiene-styrene content in the range of about 15% 40% by weight, (b) at least about 10% by weight of a butadienestyrene radial block copolymers having a differing butadiene content in the range of about 85% - ?0% by weight and a styrene content in the range of about 15% - 40% by weight, both said radial block copolymers (a) and (b) having an average molecular weight of at least 150,000 as measured by inherent viscosity in toluene, and (c) about 5% - 75% by weight of said radial block copolymer of n clear polymeric material selected from the group consisting of acrylics, thermoplastic epoxies, polycarbonates, polyisobutylenes, polyesters, polyvinylchloride, olefin/P.V.C. copolymers, and polyether and polyester urethane polymers, together with an effective amount of at least one component selected from the group consisting of plasticizers, chelating agents, lubricants, antioxidarts, pigments and fillers.</p> |
