C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/624
C08F 110/06 (2006.01) C08F 4/6592 (2006.01) C08F 4/659 (2006.01)
Patent
CA 1338299
The invention provides a new structure for syndiotactic polypropylene in which the microstructure of the polymer chain consists of blocks of repeating racemic (r) dyads being predominantly connected by units consisting of a meso triad (mm). The polymer is also highly crystalline and consists of a high percentage of racemic (r) dyads, having a [r] value of larger then 0.80 and a [rrrr] value of larger than 0.70. This highly crystalline structure of syndiotactic polypropylene is achieved by use of a novel metallocene as a catalyst of the formula: R"(CpRn)(CpR')MeQk wherein each Cp is a cyclopentadienyl or substituted cyclopentadienyl ring; Rn and R'm are hydrocarbyl radicals having 1-20 carbon atoms, each Rn may be the same or different, and each R'm also may be the same or different, R'm being selected such that (CpR'm) is a substantially different substituted ring than (CpRn); R" is a structural bridge between the two Cp rings imparting stereorigidity to the Cp rings, and R" is preferably selected from the group consisting of an alkyl radical having 1-4 carbon atoms or a hydrocarbyl radical containing silicon, germanium, phosphorus, nitrogen, boron, or aluminum; Me is a Group 4b, 5b, or 6b metal from the Periodic Table of Elements; each Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; 0 k 3; 0 n 4; and 1 m 4.
603307
Ewen John A.
Razavi Abbas
Fina Technology Inc.
Gowling Lafleur Henderson Llp
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