Syndiotactic styrene polymers and process for the production...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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C525S245000, C525S249000, C525S333200, C525S326100, C525S359200, C526S241000, C526S293000, C526S346000, C526S347000, C526S326000

Reexamination Certificate

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07026406

ABSTRACT:
A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1):wherein C1of a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined by13C-NMR, and Raand m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.

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