Selectively sulfonated block copolymers and process for their preparation
Abstract
Abstract ELASTIC BLOCK COPOLYMER CONTAINING A POLYELECTROLYTE SEGMENT, PREPARED BY SELECTIVE SULFONATION OF UNSATURATED BLOCK COPOLYMERS WHEREIN THE SULFONATION IS EXCLUSIVELY CONFINED TO THE UNSATURATED ELASTOMERIC SEGMENTS, AND THE PLASTIC SEGMENTS ARE UNALTERED, EXHIBIT WATER ABSORPTION CHARACTERISTICS, AND PROPERTIES WHEN SWOLLEN WITH WATER WHICH INDICATE THEIR UTILITY FOR USE AS CONSTRUCTION MATERIALS OF DEVICES FOR SURGICAL IMPLANTATION OR FOR BLOOD CIRCULATION AND OXYGENATION. ADDITIONALLY, THESE BLOCK COPOLYMERS HAVE CLASS UTILITY AS REINFORCING MATERIAL FOR NATURAL AND SYNTHETIC RUBBERS, FOR MODIFICATION OF RUBBER-BASED ADHESIVES, AND FOR HIGH IMPACT PLASTICS. ENCYCLOPEDIA OF POLYMERS TECHNOLOGY (EPT), VOLUME 2, 1965, PAGES 485, 507, AND 517 (INTERSCIENCE-WILEY). THE PROCESS FOR PREPARATION EMPLOYS COMPLEXES OF CHLOROSULFONIC ACID WITH ETHERS TO OBTAIN SELECTIVE SULFONATION OF THE ELASTOMERIC SEGMENT ONLY.
Inventors
- 👤 William P O'neill
- 👤 Walter V Turner Jr
Bibliographic Details
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