| 摘要 |
<p>1340554 Alternating ethylene-conjugated diene copolymers MARUZEN PETROCHEMI CAL CO Ltd 19 April 1971 [19 March 1970 13 April 1970] 24647/71 Heading C3P Novel copolymers of ethylene and a C 4 -C 12 conjugated diene are obtained by polymerizing the monomers in the liquid phase in the presence of a catalyst comprising (i) AlR 3 , where R is a C 1 -C 12 hydrocarbyl group, (ii) a titanium tetrahalide, and preferably also (iii) a compound containing a carbonyl group. The resulting polymer has alternating diene and ethylene units, the structure of the diene units being non- stereospecific, i.e. a mixture of cis-1,4, trans-1,4 and 1,2 (or 3,4) structures. An ethylene-rich (<20 mol. per cent of diene) random copolymer is also produced and may be separated from the alternating copolymer by solvent extraction. The alternating copolymers have low melting points (<55‹ C. for butadiene copolymers) or do not melt, and they are elastomeric. The examples describe the preparation of copolymers of ethylene with butadiene or isoprene in a small volume of toluene using.as the catalyst (i) AlEt 3 or Al(i-Bu) 3 , (ii) TiCl 4 or TiBr 4 and, optionally, (iii) acetone, acetophenone, benzophenone, acetylacetone, propionic or isobutyric acid anhydride, isobutyraldehyde, acetic acid, isoamyl acetate, diethyl malonate, benzoyl peroxide, aluminium, zinc or vanadyl acetate, TiCl(O.CO.Et) 3 , TiCl 2 (O.CO.Et) 2 or TiO(acac) 2 .</p> |
