Production and Application of Chlorinated Olefinic Block Copolymers
Publication Date: 2010-Jul-19
The IP.com Prior Art Database
Compositions of chlorinated polyolefins are known and have been commercially produced for many years. The properties of such materials, which have good chemical and abrasion resistance, and equivalent or better impact resistance, have made them useful in a number of areas, such as ply roofing membranes, wire and cable jacketing, under-the-hood automotive molded parts, such as, boots and wiring, and for other thermoplastic or thermoset uses. In many situations, the addition of chlorine has so changed the properties of the base polyolefin that new compositions have resulted, which provide satisfaction in service and enhanced utility over other thermoplastic and thermoset materials. However, the final properties of the chlorinated polyolefin polymer are determined to a large degree by the properties of the base polyolefin resin. A family of olefin block copolymers (OBC) has been developed and which offers the potential for unexpected properties when chlorinated or chlorosulfonated, to form new compositions of chlorinated or chlorosulfonated olefinic block copolymers. A number of applications have been filed which disclose these new olefinic block copolymers. The olefin multi-block interpolymers are described in International Publication Nos. WO 2005/090427, WO 2008/080081, and U.S. Publication No. 2006/0199914. Flexible polyvinylchloride (PVC) alloys are made from a variety of polymers that are miscible and/or compatible with PVC. Examples of such alloys are the Flexalloy™ products (available from Teknor Apex). The elastomer can be an AFFINITY™ Polyolefin Plastomer (available from The Dow Chemical Company), and the compatibilizer can be chlorinated polyethylene. Enhanced flexibility at low temperatures, particularly ranging from -50°C to -10°C, is a desired trait for such PVC alloys.