Anionic polymers of acrylic and/or methacrylic acids and maleic esters, and salts thereof, and their use as cement/concrete additives
AssigneeCognis Iberia S.L.
InventorsRamon Valls, Jaime Tuduri, Rafael Pi Subirana
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Abstract
Anionic polymers obtainable by: (a) esterifying maleic acid or its anhydride with alkyl polyalkylene glycols; (b) copolymerizing the esters obtained with (meth)acrylic acid; and (c) converting the polymers obtained into the salt form by addition of alkali metal bases; are disclosed.
Claims19
An alkali metal salt of a copolymer of a maleic ester and a comonomer selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof, wherein the maleic ester comprises an esterification product of a component selected from the group consisting of maleic acid and maleic anhydride with an alkyl polyalkylene glycol.
A process for preparing an anionic polymer, said process comprising:
- (a) esterifying a component selected from the group consisting of maleic acid and maleic anhydride with an alkyl polyalkylene glycol to form a maleic ester;
- (b) copolymerizing the maleic ester with a comonomer selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof to form a polymer;
- and
- (c) neutralizing the polymer with an alkali metal base.
Dependencies are inferred from the claim text.