Cement retarder and cement retardative sheet
AssigneeDaicel-Huels Ltd.
InventorsToru Ikuta, Hiroaki Arita
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Abstract
A polymer comprising an anionic group (e.g. an acid anhydride group, a carboxyl group) and a hydrophilic segment (e.g. a polyoxyalkylene ether unit) is used as a cement retarder. The polymer is obtainable by copolymerization of a monomer including maleic anhydride with a monomer including a vinylalkyl ether-series monomer in which an alkylene oxide is added to allyl alcohol. The polymer may be a copolymer copolymerized with other monomers such as styrene. Use of this cement retarder can provide patterns or washing-finished face on the surface of a concrete product. The cement retarder is suitable for application for a cement retardative sheet.
Claims7
A method of retarding the hardening of a cement by contacting the cement with a cement retardant comprising a polymer having an anionic group which can form a chelate with a divalent metal ion and a hydrophilic segment, wherein said polymer comprises a polymerizable macromolecule having an anionic group or a polymerizable macromolecule which can generate the anionic group.
A cement retardative sheet wherein a cement retarder is applied to at least one surface of said sheet, and the cement retarder comprises a polymer having an anionic group which can form a chelate with a divalent metal ion and a hydrophilic segment, and wherein said polymer comprises a polymerizable macromolecule having an anionic group or a polymerizable macromolecule which can generate the anionic group.
Dependencies are inferred from the claim text.