Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2011-07-26
2011-07-26
Choi, Ling-Siu (Department: 1762)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C502S110000
Reexamination Certificate
active
07985814
ABSTRACT:
The present invention provides a main catalyst component for olefin polymerization, which is prepared by a process comprising the steps of: (i) reacting a magnesium compound in nascent state having a rational formula (RMgX)y(MgX2), in which R is an alkyl having from 3 to 12 carbon atoms, X is a halogen, and y is a value of from 0.02 to 1, with an alcohol having a formula R1OH, in which R1is an alkyl having from 2 to 12 carbon atoms, to form a homogeneous solution; (ii) reacting an alkyl magnesium compound having a formula R′MgR″, in which R′ and R″ are independently an alkyl having from 1 to 20 carbon atoms, with the homogeneous solution formed in the step (i) to form a magnesium complex; (iii) reacting the magnesium complex with a halogenating agent in the presence of a silica, to form a magnesium halide-containing intermediate product; and (iv) reacting the magnesium halide-containing intermediate product from the step (iii) with a titanium compound having a formula Ti(OR2)mCl4-m, in which R2is an alkyl having from 1 to 10 carbon atoms and m is an integer of from 0 to 4, to form a titanium-containing main catalyst component. The main catalyst component of the invention, when used together with an orgaoaluminium cocatalyst component in a single polymerization stage in one reactor to catalyze the polymerization of ethylene to polyethylene, gives a polyethylene having a molecular weight distribution of from 6 to 10.
REFERENCES:
patent: 5298474 (1994-03-01), Luciani et al.
patent: 6365540 (2002-04-01), Garoff et al.
patent: 2005/0170949 (2005-08-01), Xiao et al.
Xiao Mingwei
Ye Xiaofeng
Yu Shijiong
Birch & Stewart Kolasch & Birch, LLP
China Petroleum & Chemical Corporation
Choi Ling-Siu
Shanghai Research Institute of Chemical Industry
Wright Sonya
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