Cement dispersing agent

• US 4,888,059 A
• Filed: 12/22/1987
• Issued: 12/19/1989
• Est. Priority Date: 12/25/1986
• Status: Expired due to Fees

• Current Assignee: Dainippon Ink and Chemicals Incorporated
• Original Assignee: Dainippon Ink and Chemicals Incorporated
• Inventors: Yamaguchi, Kouichi, Goto, Tokio
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): Green, Anthony J.
• Application Number:
  US07/136,344
• Time in Patent Office: 728 Days
• Field of Search: 106/90, 106/314, 106/315, 524/5
• US Class Current: 106/823
• CPC Class Codes: C04B 24/2641 Polyacrylates; Polymethacrylates
• CPC Class Codes: Y10S 516/01 Wetting, emulsifying, dispersing, or stabilizing agents

Abstract

A cement dispersing agent comprising as an essential component a copolymer obtained by copolymerizing (a) 40 to 90% by weight, calculated as an alpha,beta-ethylenically unsaturated carboxylic acid, of the alpha,beta-ethylenically unsaturated carboxylic acid and/or its salt and (b) 60 to 10% by weight of an acrylic ester and/or a methacrylic ester of an alkyl alcohol having 1 to 4 carbon atoms, or a copolymer obtained by copolymerizing (a) 40 to 89% by weight, calculated as an alpha,beta-ethylenically unsaturated carboxylic acid, of the alpha,beta-ethylenically unsaturated carboxylic acid and/or its salt, (b) 51 to 10% by weight of an acrylic ester and/or a methacrylic ester of an alkyl alcohol having 1 to 4 carbon atoms and (c) 1 to 9% by weight of the other copolymerizable unsaturated monomer.

Claims

1. A cement dispersing agent consisting essentially of a copolymer obtained by copolymerizing a reaction mixture consisting essentially of (a) 40 to 90% by weight, calculated as an alpha,beta-ethylenically unsaturated monocarboxylic acid, of at least one compound selected from the group consisting of an alpha,beta-ethylenically unsaturated monocarboxylic acid and a salt of the alpha,beta-ethylenically unsaturated monocarboxylic acid and (b) 60 to 10% by weigh of at least one compound selected from the group consisting of an acrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and a methacrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms, or a copolymer obtained by copolymerizing a reaction mixture consisting essentially of (a) 44 to 89% by weight, calculated as an alpha,beta-ethylenically unsaturated monocarboxylic acid, of at least one compound selected from the group consisting of an alpha,beta-ethylenically unsaturated monocarboxylic acid and a salt of the alpha,beta-ethylenically unsaturated monocarboxylic acid, (b) 51 to 10% by weight of at least one compound selected from the group consisting of an acrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and a methacrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and (c) 1 to 5% by weight of a copolymerizable unsaturated monomer.

2. The cement dispersing agent of claim 1 wherein the alpha-beta-ethylenically unsaturated monocarboxylic acid is methacrylic acid.

3. The cement dispersing agent of claim 1 wherein the alpha-beta-ethylenically unsaturated monocarboxylic acid is acrylic acid.

4. The cement dispersing agent of claim 1 wherein the salt of the alpha-beta-ethylenically unsaturated monocarboxylic acid is a salt formed from the alpha,beta-ethylenically unsaturated monocarboxylic acid and an alkali metal.

5. The cement dispersing agent of claim 1 wherein the methacrylic ester of the monohydric alkyl alcohol having 1 to 4 carbon atoms is methyl methacrylate.

6. The cement dispersing agent of claim 1 wherein the methacrylic ester of the monohydric alkyl alcohol having 1 to 4 carbon atoms is ethyl methacrylate.

7. The cement dispersing agent of claim 1 wherein the acrylic ester of the monohydric alkyl alcohol having 1 to 4 carbon atoms is methyl acrylate.

8. The cement dispersing agent of claim 1 wherein the acrylic ester of the monohydric alkyl alcohol having 1 to 4 carbon atoms is ethyl acrylate.

9. A cement dispersing agent consisting essentially of a copolymer obtained by copolymerizing a reaction mixture consisting essentially of (a) 40 to 90% by weight, calculated as an alpha,beta-ethylenically unsaturated monocarboxylic acid, of at least one compound selected from the group consisting of an alpha,beta-ethylenically unsaturated monocarboxylic acid and a salt of the alpha,beta-ethylenically unsaturated monocarboxylic acid and (b) 60 to 10% by weight of at least one compound selected from the group consisting of an acrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and a methacrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms in an aqueous medium, or a copolymer obtained by copolymerizing a reaction mixture consisting essentially of (a) 44 to 89% by weight, calculated as an alpha,beta-ethylenically unsaturated monocarboxylic acid, of at least one compound selected from the group consisting of an alpha,beta-ethylenically unsaturated monocarboxylic acid and a salt of the alpha,beta-ethylenically unsaturated monocarboxylic acid, (b) 51 to 10% by weight of at least one compound selected from the group consisting of an acrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and a methacrylic ester of a monohydric alkyl alcohol having 1 to 4 carbon atoms and (c) 1 to 5% by weight of a copolymerizable unsaturated monomer in an aqueous medium.

10. The cement dispersing agent of claim 9 wherein the aqueous medium is water.