METHOD OF NARROWING DISTRIBUTION OF SHORT-CHAIN BRANCHINGS IN TWO-STAGE ETHYLENE POLYMERISATIONS AND IN THEIR PRODUCTS,申请号RU20080105412-传众专利搜索

METHOD OF NARROWING DISTRIBUTION OF SHORT-CHAIN BRANCHINGS IN TWO-STAGE ETHYLENE POLYMERISATIONS AND IN THEIR PRODUCTS

申请公布号：RU2364608(C1)

申请号：RU20080105412

申请日期：2006.03.02

申请公布日期：2009.08.20

申请人：

IKVISTAR KEMIKALZ, EHLPI

发明人：REJNKING MARK K.

分类号：C08F2/44;C08F210/16;C08F297/08

主分类号：C08F2/44

摘要：FIELD: chemistry. ^ SUBSTANCE: invention relates to improved two-stage method, in which in first polymerisation reactor ethylene homopolymer is obtained, and in second polymerisation reactor ethylene--olefin copolymer is obtained; said polymerisations being carried out in inert hydrocarbon medium using solid highly active catalyst, which contains transitive metal, and aluminium-organic co-catalyst, and said homopolymer and co-polymer are joined obtaining product in form of final polyethylene resin, ensuring narrowing of distribution of short-chain branchings in ethylene--olefin copolymer, which differs by the fact that it includes carrying out copolymerisation in second polymerisation reactor in presence of from 1 to 100 p/mln, calculated per amount of inert hydrocarbon, monoalkyltrialkoxysilane, described by formula R2Si(OR3)3, where R2 represents C1-10 alkyl group, and R3 represents C1-5 alkyl group, with simultaneous preservation in reactor of such conditions and rates of raw material supply, at which obtained is copolymer which has density equal 0.940 g/cm3 or less and contains 90% or more of copolymer with low degree of short-chain branchings, having fewer than 10 branchings per 1000 carbon atoms. ^ EFFECT: method allows to obtain resins demonstrating improved physical characteristics. ^ 8 cl