High stereospecific polybutylene polymer and highly active...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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Details

C526S125300, C526S194000, C526S348600, C526S905000

Reexamination Certificate

active

07345122

ABSTRACT:
Disclosed is a process for the preparation of a high stereospecific (isotactic) polybutylene polymer comprising the step of polymerizing a reactive monomer, 1-butene, which is used or is not used as a solvent, in the presence of catalyst and inert gas. According to the present invention, it is possible to prepare a high stereospecific polybutylene polymer in much higher activity than that of any other known processes for the preparation of a high stereospecific polybutylene polymer. The high stereospecific polybutylene polymer according to the present invention is a homopolymer of 1-butene, or a copolymer containing a-olefin and up to 40% by weight of a comonomer, wherein titanium in the catalyst residues is not detected in the ppm level, stereospecificity (Isotactic Index, mmmm %) determined by13C-NMR is 96 or more, molecular weight distribution (Mw/Mn) is 3-6, and molecular weight distribution (Mw/Mn) can be controlled to 8 or more.

REFERENCES:
patent: 4324875 (1982-04-01), Harada et al.
patent: 4404341 (1983-09-01), Ushida et al.
patent: 4725656 (1988-02-01), Kashiwa et al.
patent: 5053467 (1991-10-01), Kondo et al.
patent: 5241024 (1993-08-01), Yamawaki et al.
patent: 0172961 (1986-03-01), None
patent: 1982-0001309 (1982-07-01), None

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