Formic acid and alkali metal formates as chain transfer agents i

Details Formic acid and alkali metal formates as chain transfer agents i Formic acid and alkali metal formates as chain transfer agents i

1980-02-25

1981-12-22

Wong, Jr., Harry

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263031, 5263076, 5263073, C08F12238

Patent

active

043072151

ABSTRACT:
A method of using formic acid or metal salts thereof in effective concentrations as very efficient chain transfer agents to limit the molecular weight and intrinsic viscosity of acrylamide based polymers. The formic acid or metal formate is utilized in such polymers by adding to the monomer prior to polymerization amounts of 0.05-6.5% by weight to control polymer molecular weights where the subsequent polymer is to be used as a flocculating agent, sewage treatment agent, or any other appropriate use. Polymers of special interest in this invention are polyacrylamide and anionic or cationic copolymers of acrylamide. Examples of polymers which can be made according to this invention include polyacrylamide (nonionic), copolymers of acrylamide, and N,N-dimethylaminoethylmethacrylate (cationic) and copolymers of acrylamide and acrylic acid (anionic). In the manufacture of the subject polymer, the percent monomer employed can range from about 10-90% by weight and is preferably from 10-50% by weight. In the most preferred practice of this invention, the percent monomer ranges from approximately 20-35% by weight.

REFERENCES:
patent: 3328362 (1967-06-01), Roberts et al.
patent: 3929739 (1975-12-01), Barabas et al.
patent: 4125508 (1978-11-01), Elfers

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