润滑科技信息平台

专利摘要

Ethylene terpolymers with a low number average molecular weight of from 1500 to 5500 and a vinyl acetate content of from 10 to 20% by weight, useful in wax modifiers or petroleum fraction additives, are prepared by high pressure polymerization (at least 500 bar and 150°C) in presence of 10 to 25% by weight of an iso olefin such as isobutylene. Incorporation of the iso olefin gives terpolymer products containing from 3 to 13% weight of iso olefin. ......

基本信息

专利类型:
发明专利
申请/专利号:
EP1983303453
申请日期:
1983-06-15
专利申请人:
埃克森研究工程公司
分类号:
["C08F10/00","C08F18/08","C08F210/00","C08F210/02","C08F218/00","C08F218/02","C09K3/00","C10L1/18","C10L1/197"]
发明/设计人:
DAVIES, BRIAN WILLIAM ， NUTTENS, HUGO JOZEF CORNEEL
权利要求: 1. An ethylene/vinyl acetate/iso olefin terpolymer characterised by having a Mn of from 1500 to 5500, having from 6 to 15 methyl groups per 100 methylene groups other than the methyl groups on the vinyl acetate and comprising from 10 to 20% by weight of vinyl acetate and from 3 to 15% by weight of an iso olefin of the general formula: wherein R and R' which may be the same or different each represent hydrogen or an alkyl group having from 1 to 4 carbon atoms. _ 2. An ethylene terpolymer as claimed in claim 1 having a Mn of from 1500 to 4500, having from 6 to 11 methyl groups per 100 methylene groups and comprising from 10 to 20% by weight vinyl acetate and from 3 to 8% by weight of isobutylene as measured by the peak at a chemical shift of 42.3 in the 13C nmr spectrum of the polymer. _ 3. An ethylene terpolymer as claimed in claim 2, having a Mn of from 3000 to 4000 and from 6 to 9 methyl groups per 100 methylene groups. 4. An ethylene terpolymer as claimed in claim 2 or claim 3, having from 2 to 5 methyl groups resulting from ethylene polymerisation. 5. A process for the preparation of an ethylene terpolymer comprising from 10 to 20% vinyl acetate and from 3 to 15 wt% of an iso olefin of the general formula I as defined in claim 1 and having a Mn of from 1500 to 5500 and 6 to 15 methyl groups per 100 methylene groups other than the methyl`groups in the vinyl acetate, in which ethylene is polymerised with vinyl acetate at a pressure of at least 500 bar and at a temperature of at least 150°C in the absence of any significant amount of inert solvent and in the presence of from 7 to 25% by weight, based on the total reaction mixture, of the iso olefin. 6. A process according to claim 5 for the preparation of an ethylene terpolymer comprising from 10 to 20% vinyl acetate and from 3 to 15 wt% of isobutylene and having a Mn of from 1500 to 4500 and 6 to 11 methyl groups per 100 methylene groups, in which process ethylene is polymerized with vinyl acetate at a pressure of at least 500 bar and at a temperature of at least 150°C in the absence of any significant amount of an inert solvent and in the presence of from 7 to 20% by weight, based on the total reaction mixture, of isobutylene, the reaction conditions and the amount of isobutylene being selected to give the desired combination of molecular weight and number of methyl groups in the product. 7. A process as claimed in claim 6, in which the reaction is carried out at a pressure of from 700 to 1900 bar. 8. A process as claimed in claim 6 or claim 7, in which the reaction temperature is from 170 to 270°C. 9. A process as claimed in any of claims 6 to 8, in which the residence time is from 20 to 120 seconds. 10. A distillate fuel oil composition comprising from 0.001 to 2 wt% of the oil of a terpolymer as claimed in claim 1. 11. A distillate fuel oil composition comprising from 0.001 to 2 wt% of the oil of a terpolymer as claimed in claim 2. 12. The use of a terpolymer as claimed in claim 1 or claim 2 as a flow improver in distillate fuel oils or a pour point depressant or a viscosity index improver in lubricating oils.