IP Library › Granted Patent US 10,550,038
Granted Patent B2
US 10,550,038 · App. 15/781,769 · Granted Feb 4, 2020

Cement admixture

Inventors: Takahiro Saka (Osaka, JP); Chizuko Furo (Osaka, JP); Shusaku Mandai (Osaka, JP)
Assignee: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
C04B24/2623C08F8/28C08F16/06E21B43/29C08F8/46C08K5/092
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Quick Facts
Patent No.
US 10,550,038
App. No.
15/781,769
Granted
Feb 4, 2020
Kind
B2
Abstract

A cement admixture includes a crosslinked product of a modified polyvinyl alcohol-based resin, wherein the dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less.

Claims (24)

1. A cement admixture comprising:

a crosslinked product of a modified polyvinyl alcohol-based resin,

wherein a dissolution rate of 1 g of the crosslinked product of a modified polyvinyl alcohol-based resin for 1 liter of water at 70° C. is 50% or less;

wherein the modified polyvinyl alcohol-based resin is a carboxyl group-containing polyvinyl alcohol-based resin (A).

2. The cement admixture according to claim 1 ,

wherein the crosslinked product of the modified polyvinyl alcohol-based resin is a thermally crosslinked product (A1) of the carboxyl group-containing polyvinyl alcohol-based resin (A).

3. The cement admixture according to claim 1 ,

wherein the crosslinked product of the modified polyvinyl alcohol-based resin is a crosslinker crosslinked product (A2) of the carboxyl group-containing polyvinyl alcohol-based resin (A).

4. The cement admixture according to claim 3 ,

wherein the crosslinker used for crosslinking of the carboxyl group-containing polyvinyl alcohol-based resin (A) is a polyamidopolyamine-epihalohydrin-based resin.

5. The cement admixture according to claim 1 ,

wherein the carboxyl group-containing polyvinyl alcohol-based resin (A) is a maleic acid-modified polyvinyl alcohol-based resin.

6. The cement admixture according to claim 1 ,

wherein the cement admixture is a cement admixture for drilling.

7. A method for producing a cement slurry, comprising:

adding the cement admixture according to claim 1 .

8. The method according to claim 7 ,

wherein the cement slurry is a drilling cement slurry.

9. A method for preventing dehydration from a cement slurry by using the cement admixture according to claim 1 .

10. The method according to claim 9 ,

wherein the cement slurry is a drilling cement slurry.

11. Use of the cement admixture according to claim 1 for preventing dehydration from a cement slurry.

12. The use of the cement admixture according to claim 11 ,

wherein the cement slurry is a drilling cement slurry.

Assignments (2)
MERGER Recorded May 2, 2019
From: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
To: MITSUBISHI CHEMICAL CORPORATION
Reel/Frame 049110/0285 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 6, 2018
From: SAKA, TAKAHIRO; FURO, CHIZUKO; MANDAI, SHUSAKU
To: THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD.
Reel/Frame 046002/0030 →
Priority Claims (2)
JP 2015-240393 · Dec 9, 2015 · national
JP 2015-243453 · Dec 14, 2015 · national
Continuity (1)
Related Publication 20180362404A1 · Dec 20, 2018