ETHYLENE/ALPHA-OLEFIN BLOCK COPOLYMERS AND METHODS FOR PREPARATION THEREOF Russian patent published in 2000 - IPC

FIELD: polymer production. SUBSTANCE: invention provides novel block copolymers including both crystalline and elastomer blocks and which, more specifically, consists of so called A and B blocks. The former includes ethylene polymer and its melting point is at least 110 C. The latter includes first polymer segment adjacent to A and B block joint location and containing ethylene and α-alpha-olefin units. B block includes tip segment most distanced from joint location and represents polymer of ethylene, C₃-C₈-alpha-olefin, and optionally unconjugated diene. Molar percentage of unconjugated diene units, if present, is up to 10% of total number of monomer units in block copolymers. Intramolecular distribution of constituents in B block is such that at least two fragments (5 wt % of B block each) differ from each other by at least 5 wt % in content of ethylene units. Associated block copolymers can be used as thermoplastic elastomers manifesting physical properties close to those of vulcanized elastomers but capable of being thermally processed after association. Block copolymers can also be used as lube oil and fuel additives, as plastic components, in bitumen mixtures, as components in glue melts, and as roof deck compound component. EFFECT: expanded application possibilities. 38 cl, 6 dwg, 13 tbl