Multifunctional maleate polymers

Details Multifunctional maleate polymers Multifunctional maleate polymers

C - Chemistry, Metallurgy

11

D

C11D 3/37 (2006.01) B01F 17/00 (2006.01) B01F 17/52 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C09D 17/00 (2006.01) C11D 3/00 (2006.01) C11D 3/10 (2006.01) C11D 3/12 (2006.01) D21H 17/37 (2006.01) D21H 21/02 (2006.01) D21H 21/08 (2006.01)

Patent

CA 2119998

Maleate copolymers comprise less than 1% residual total free monomer and have a weight average molecular weight of 500 to 7,000. The copolymer comprises at least 50 mole percent maleate, 10 to 50 mole percent acrylate monomer and, preferably, about 1 to 10 mole percent of at least one non-ionic comonomer. The copolymers are useful in inhibiting deposition of water hardness ions, in detergents and as dispersants in aqueous slurries. Copolymers are prepared by an aqueous solution polymerization process, comprising the steps of initially neutralizing at least 70%, on a molar basis, of the charge of a maleate monomer, followed by the slow addition of at least one polymerizable comonomer, together with an oxidative free radical initiator and a suitable metallic ion reductant, for synthesis over at least a three hour period at 80 to 100°C, followed by the addition of more initiator.

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