Preparation of water-reducing copolymers for concrete
AssigneeArco Chemical Technology, L.P.
InventorJianzhong Shen
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Abstract
Alkoxylated acrylate and methacrylate macromonomers are disclosed that are useful in the preparation of water-reducing additives for concrete, ultraviolet light-curable adhesives, and water-dispersed polyurethanes. The macromonomers are suitably prepared by alkoxylating a hydroxyalkylacrylate or hydroxyalkylmethacrylate in the presence of a DMC catalyst using the continuous addition of starter (CAOS) in order to prevent the formation of by-products during the fabrication of the macromonomer.
Claims2
A process for making concrete, said process comprising:
- (a) reacting a hydroxyalkyl acrylate or hydroxyalkyl methacrylate with an alkylene oxide in the presence of a double metal cyanide catalyst at a reaction temperature within the range of about 60° C. to about 130° C. by continuously feeding both the hydroxyalkyl acrylate or hydroxyalkyl methacrylate and the alkylene oxide into a reactor to produce a macromonomer having essentially no diol content;
- (b) producing a copolymer of the macromonomer and a monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, styrene, maleic acid or anhydride, methyl methacrylate, and mixtures thereof;
- and
- (c) mixing the copolymer, as a water reducing additive, with cement, sand, and water to form concrete;
- said water being present in an amount less than the amount necessary to form concrete in the absence of the copolymer.
A process of producing water-dispersed polyurethane, said process comprising:
- (a) reacting a hydroxyalkyl acrylate or hydroxyalkyl methacrylate with an alkylene oxide in the presence of a double metal cyanide catalyst at a reaction temperature within the range of about 60° C. to about 130° C. by continuously feeding both the hydroxyalkyl acrylate or hydroxyalkyl methacrylate and the alkylene oxide into a reactor to produce a macromonomer having essentially no diol content;
- (b) producing a copolymer of the macromonomer and a monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, styrene, maleic acid or anhydride, methyl methacrylate, and mixtures thereof;
- and
- (c) reacting the copolymer with an isocyanate to produce a water-dispersible polyurethane.
Dependencies are inferred from the claim text.