Method for preparation of polymethacrylates by the anionic polym

Details Method for preparation of polymethacrylates by the anionic polym Method for preparation of polymethacrylates by the anionic polym

Filed on

1974-05-06

Date issued

1976-07-20

Examiner

Wong, Jr., Harry

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Polymers from only ethylenic monomers or processes of...

Other Related Categories

526209, 526213, 526328, C08F12014

Type

Patent

Status

active

Patent number

039706095

Description

ABSTRACT:
A method for preparation of polymethacrylate esters by the anionic polymerization characterized by application of new initiation systems based on esters of .alpha.-lithio carboxylic acids having 2-30 carbon atoms in a straight or branched chain and 1-6 ester groups in a molecule, or on their adducts or complexes with lithium alkoxides having 3-16 carbon atoms in a straight or branched chain. The polymerization is carried out at temperatures -70.degree. to +50.degree. C, preferably at +20.degree. C, with the monomer - to - initiator ratio equal 10 to 1500. The polymers which have new mechanical and solution properties due to the new preparation method are suitable as additives into mineral oils increasing their viscosity indexes and suppressing their solidification temperature, as a cement in medical practice, and the like.

REFERENCES:
patent: 3410836 (1968-11-01), Hsich
patent: 3631006 (1971-12-01), Hawkins
patent: 3679644 (1972-07-01), Van Der Meij et al.
patent: 3761529 (1973-09-01), Drahoslav et al.

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