Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1987-01-29
1988-09-27
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5263171, 526233, C08F 200
Patent
active
047743034
ABSTRACT:
Polymers of acrylic acid or methacrylic acid are prepared by polymerizing acrylic acid and/or methacrylic acid at 50.degree.-180.degree. C. in a C.sub.2 -C.sub.6 -alcohol or mixtures thereof with water having a C.sub.2 -C.dwnarw.6.uparw.-alcohol content of not less than 40% by weight in the presence of free radical polymerization initiators and from 0.01 to 5% by weight, based on the monomers used, of inorganic acids of phosphorus in which the phosphorus has an oxidation number of from 1 to 4, or of water-soluble salts thereof, water-soluble --PO(OH).sub.2 -containing compounds and/or water-soluble salts thereof. The polymers thus prepared are effective milling aids and dispersants for pigments for producing aqueous pigment slurries for use in paper-coating compositions.
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Becker Hans-Werner
Denzinger Walter
Hartmann Heinrich
Hirsch Guenter
Rohmann Michael
BASF - Aktiengesellschaft
Sarofim N.
Schofer Joseph L.
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