Process for controlling the molecular weight distribution of hig

Details Process for controlling the molecular weight distribution of hig Process for controlling the molecular weight distribution of hig

1998-06-09

2000-01-11

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526142, 526143, 526213, 526214, 5263404, C08F 480, C08F 3606

Patent

active

060137460

ABSTRACT:
This invention relates to a process for controlling the molecular weight distribution of high 1,4-cis polybutadiene and more particularly, to a process of easily controlling the molecular weight distribution of polybutadiene which is concerned directly with the physical properties such as processability, in such a manner that preparation of high 1,4-cis polybutadiene is made available via polymerization of 1,3-butadiene in the presence of Ziegler-Natta catalyst, adding carboxylic acid represented by following formula I for the controlling of the molecular weight distribution of polybutadiene based on the contents of carboxylic acid, may be easily controlled, without any alternation in the 1,4-cis contents. ##STR1## Wherein R is selected from the group consisting of alkyl, cycloalkyl and arylalkyl groups substituted or unsubstituted with at least one or more halogen atoms, or alkyl, cycloalkyl and arylalkyl groups with at least one or more double bonds containing from 5 to 20 carbon atoms.

REFERENCES:
patent: 3649605 (1972-03-01), Throckmorton
patent: 3816567 (1974-06-01), Yagi et al.
patent: 3928303 (1975-12-01), Yasui et al.
patent: 4533711 (1985-08-01), Takeuchi et al.
patent: 5100982 (1992-03-01), Castner
patent: 5451646 (1995-09-01), Castner

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