Appeal No. 1999-1832
Application No. 08/474,233
alkyl phosphites, aryl phosphites and aralkyl
phosphites where alkyl has one to four carbon
atoms and aryl has six to ten carbon atoms to form
a homogeneous solution;
b) mixing the homogeneous solution with a
liquid titanium compound having the formula
TiXn(OR)4-n wherein X is halogen, R is an alkyl
group being identical or different and n is an
integer of 0 to 4;
c) adding at least one auxiliary precipitant
selected from the group consisting of carboxylic
acid anhydrides, carboxylic acids, ethers and
ketones to form a precipitate;
d) adding a polycarboxylic acid ester when a
precipitate appears;
e) separating the precipitate from the
mixture and treating the separated precipitate
with titanium compound, TiXn(OR)4-n wherein X is
halogen, R is a hydrocarbon group and may be
identical or different, and n is and [an] integer
of from 0 to 4, or a mixture thereof, in an inert
diluent; and
f) washing the treated precipitate with an
organic inert diluent
(b) contacting, the catalyst with an
organoaluminum compound;
(c) contacting said catalyst with an electron
donor either simultaneously with or after step
(b), said electron donor described by the formula:
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