Preparation of pulverulent polymers of acrylic and/or methacryli

Details Preparation of pulverulent polymers of acrylic and/or methacryli Preparation of pulverulent polymers of acrylic and/or methacryli

1989-11-20

1992-01-28

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526212, 526216, 526287, 526214, C08F 238

Patent

active

050845357

ABSTRACT:
Pulverulent polymers of acrylic acid and methacrylic acid are prepared by polymerizing (a) from 100 to 70% by weight of acrylic acid, methacrylic acid or a mixture thereof and (b) from 0 to 30% by weight of vinylsulfonic acid or an alkali metal salt thereof in a monohydric C.sub.1 -C.sub.8 -alcohol, water or a mixture thereof in a pulverulent bed in the presence of a polymerization initiator and from 0.05 to 10 mol % of thiocarboxylic acid and/or a mercaptoalcohol and from 0.05 to 10 mol % of propionic acid or formic acid as regulators, each percentage being based on the monomers used in the polymerization, by maintaining the pulverulent state during the polymerization, removing the heat of polymerization by distilling off the solvent and recirculating the reaction mixture.

REFERENCES:
patent: 3898037 (1975-08-01), Lange et al.
patent: 3941724 (1976-03-01), Bolto
patent: 4135043 (1979-01-01), Kast et al.
patent: 4301266 (1981-11-01), Muenster et al.
patent: 4698404 (1987-10-01), Cramm et al.

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