Substantially homogeneous copolymers of acrylic or methacrylic a

Details Substantially homogeneous copolymers of acrylic or methacrylic a Substantially homogeneous copolymers of acrylic or methacrylic a

1985-10-11

1987-12-01

Schofer, Joseph L.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

5253278, 526271, 210701, C08F 812, C08F12202

Patent

active

047105372

ABSTRACT:
Substantially homogeneous acrylate/maleate copolymers of number average molecular weight of 500 to 5000 are prepared by copolymerizing 35 to 65 mole percent acrylic or methacrylic acid with 65 to 35 mole percent maleic anhydride at 80.degree. to 150.degree. C. in the presence of a polymerization initiator and a chain-transfer solvent such that both the monomers and the formed polymer remain in solution and the mole ratio of the acrylic or methacrylic acid monomer to the maleic anhydride monomer in the solvent is maintained below about 0.2 throughout the polymerization. The copolymers in hydrolyzed form are employed at a level of from about 0.1 to 100 ppm for prevention of alkaline calcium and magnesium scale formation, such as during seawater evaporative desalination.

REFERENCES:
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"Water-Soluble Polymers", Bikales, N. M. (ed.), Plenum Press, N.Y. (1973), p. 152.

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