Method for making an alkali-soluble emulsion copolymer

Details Method for making an alkali-soluble emulsion copolymer Method for making an alkali-soluble emulsion copolymer

1993-10-04

1994-07-05

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526347, 526937, C08F 2006

Patent

active

053268431

ABSTRACT:
An emulsion polymerization process for making a low molecular weight alkali-soluble copolymer of a water insoluble monoethylenically unsaturated aromatic monomer and methacrylic acid, includes heating an aqueous reaction mixture, said reaction mixture having a pH of less than or equal to about 4.5 and including from about 25 parts by weight to about 75 parts by weight of the water insoluble monoethylenically unsaturated aromatic monomer; from about 25 parts by weight to about 75 parts by weight methacrylic acid; a polymerization initiator; a reducing agent; a catalyst effective for promoting decomposition of the polymerization initiator in the presence of the reducing agent; and an amount of a chain transfer agent effective to limit copolymer weight average molecular weight to a range of about 2,000 to about 40,000; to a temperature greater than or equal to about 75.degree. C.; and maintaining the reaction mixture at a temperature greater than or equal to about 75.degree. C. for a period of time effective to allow formation of the copolymer.

REFERENCES:
patent: 4081418 (1978-03-01), Barua et al.
patent: 4628071 (1986-12-01), Morgan
patent: 5122568 (1992-06-01), de Pierne et al.
Alkali Soluble Styrene/Acrylic Acid Emulsion Polymers, L. W. Morgan, D. P. Jensen, C. W. Weiss, S. C. Johnson & Son, Inc., Polymer Research & Analytical Research Departments, pp. 689 through 694.

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