Molecular weight control in peroxide-initiated aqueous polymeriz

Details Molecular weight control in peroxide-initiated aqueous polymeriz Molecular weight control in peroxide-initiated aqueous polymeriz

1991-09-23

1993-06-29

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263031, 526318, 526319, C08F 440, C08F 216

Patent

active

052235904

ABSTRACT:
This invention relates to the use of copper and cobalt ions to control molecular weight in the aqueous polymerization of vinyl monomers. Incorporating catalytic amounts, generally from 1 to about 300 ppm of copper or cobalt ions, in aqueous polymerization reactions initiated with peroxides, preferably with partial neutralization of the monomers, provides for molecular weight control of the resulting polymers.

REFERENCES:
patent: 4314044 (1982-02-01), Hughes et al.
patent: 4659793 (1987-04-01), Yang
patent: 4833222 (1988-05-01), Siddall et al.
patent: 4837326 (1989-06-01), Lin et al.
patent: 4886861 (1989-12-01), Janowicz
J. Macrol. Sci.-Chem., A26 (8), pp. 1137-1149 (1989).
J. Polymer Science: Polymer Chemistry Edition, vol. 19, 879-889 (1981).

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