Synthesis method for polydimethylketene by friedel-craft...

Details Synthesis method for polydimethylketene by friedel-craft... Synthesis method for polydimethylketene by friedel-craft...

2006-09-12

2006-09-12

Choi, Ling-Sui (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S157000, C526S158000, C526S348700, C526S348000, C502S103000, C502S132000

Reexamination Certificate

active

07105615

ABSTRACT:
The invention concerns a cationic catalyst system comprising an initiator (I), a catalyst (K) and a cocatalyst (CoK). The cocatalyst (CoK) is an agent releasing the active polymerizing center of its counter anion generated by the reaction between the catalyst (K) and the initiator (I). Said cocatalyst is characterized by the existence of a double bond electron-depleted by an electroattractive group. It is selected, for example, from the group consisting of the following complexing agents including o-chloranyl (3,4,5,6-tetrachloro-1,2-benzoquinone), p-chloranyl (2,3,5,6-tetrachloro-1,4-benzoquinone), nitrobenzene, trinitrobenzene, or tetracyanoethylene.

REFERENCES:
patent: 4356295 (1982-10-01), Fujii et al.
patent: 6512916 (2003-01-01), Forbes, Jr.
patent: 6846885 (2005-01-01), Langstein et al.
patent: 2002/0086959 (2002-07-01), Langstein et al.
patent: WO 01/00686 (2004-01-01), None

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