| 摘要 |
1,143,570. Olefine/alkenylsilane terpolymers. MONTECATINI EDISON S.p.A. 27 Nov., 1967 [30 Nov., 1966; 27 June, 1967], No. 53768/67. Heading C3P. A terpolymer of ethylene, propylene and an alkenylsilane of formula:- R n H m -Si(CH 2 ) p -CH=CH 2 wherein R is an alkyl, cycloalkyl or aryl group, m = 1, 2 or 3 n = 0, 1 or 2 m+n = 3 and p = 0, 1, 2, 3 or 4, is prepared by polymerizing the monomers in the presence of a catalyst system obtained from a titanium or vanadium compound and an organometallic compound of aluminium. Preferably at least one of the catalyst components contains a halogen atom. The terpolymer may have a total polyethylenic and (isotactic) polypropylenic crystallinity between 2 and 50% of the total polymer, and molar contents of ethylene, propylene and alkenylsilane of from 2 to 70%, from 30 to 98%, and from 0À02 to 5%. The terpolymer may be amorphous in the relaxed state but crystalline under stretching and has molar contents of from 65 to 85%, 20 to 35%, and 0À02 to 5%. The polymerization may be carried out in a hydrocarbon solvent, at from -20‹ to + 50‹ C. In the examples, terpolymers of ethylene, propylene and allylsilane or vinylsilane are prepared in n-heptane, under a nitrogen atmosphere, optionally in the presence of hydrogen using a catalyst system comprising titanium trichloride (aluminium reduced and activated) or vanadium oxychloride, with aluminium diethylmonochloride or aluminium ethyl sesquichloride. A molecular weight regulator, such as diethylzinc, may be present. The reaction is terminated using an acetone, methanol, hydrochloric acid mixture, different isomers of the product being obtained by successive extractions with boiling solvents. The terpoylmer may be cross-linked by treatment with a mixture of butanol and aqueous ammonia, or by treatment with alkaline alcoholic solutions. |
