C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 220/06 (2006.01) C08F 2/22 (2006.01) C08F 2/38 (2006.01) C08F 212/04 (2006.01) C08F 212/08 (2006.01) C08F 220/04 (2006.01) C08L 33/02 (2006.01)
Patent
CA 2122977
Abstract of the Invention 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, saidreaction 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 toabout 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°C; and maintaining the reaction mixture at a temperature greater than or equal to about 75°C for a period of time effective to allow formation of the copolymer.
Lorah Dennis P.
Madle Thomas G.
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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