Method of producing polyetherester monomer and cement...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/54 (2006.01) C07C 67/08 (2006.01) C07C 69/56 (2006.01) C08F 220/26 (2006.01) C08F 228/02 (2006.01)

Patent

CA 2322899

Polyetherester monomer of the kind (see above formula) where R1, R2 and R3 are each a group of a specified kind and A is a residual group of another specified kind is produced by an esterification reaction of polyalkyleneglycol with a closed end and unsaturated carboxylic acid, each of a specified kind, by using an acid catalyst under a heated and reduced-pressure condition in the absence of solvents and in the presence of a specified amount of p-benzoquinone and/or phenothiazine. Cement dispersants with improved properties are obtained from water-soluble vinyl monomers produced by using the polyetherester monomer thus obtained as intermediate product.

Monomère de polyétherester du type (voir la formule ci-dessus) dans lequel R1, R2 et R3 sont chacun un groupe d'un type spécifié et A est un groupe résiduel d'un autre type spécifié qui est produit par une réaction d'estérification du polyalkylèneglycol avec un acide carboxylique insaturé à extrémité fermée, chacun d'un type spécifié, en utilisant un catalyseur acide dans une condition de chaleur et de pression réduite en l'absence de solvants et en présence d'une quantité précise de p-benzoquinone et/ou phénothiazine. On obtient ainsi des dispersants de ciment aux propriétés améliorées à partir des monomères vinyliques hydrosolubles produits en utilisant le monomère polyétherester ainsi obtenu comme produit intermédiaire.

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