Organic-inorganic composite particles

Patent metadata

Field	Value
Publication number	US-10570327-B2
Application number	US-201816191847-A
Country	US
Kind code	B2
Filing date	Nov 15, 2018
Priority date	Nov 15, 2017
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

An object of the present invention is to improve the water dispersibility of the PVA-based resin and also to suppress the swelling of the PVA-based resin.
The object is achieved by organic-inorganic composite particles, which have an average particle size of preferably 1 μm to 3,000 μm, including a polyvinyl alcohol-based resin and a component having a three-dimensional siloxane crosslinked structure that is derived from a hydrolysis-polycondensation product of an alkoxysilane and/or a low condensate thereof, wherein the alkoxysilane includes a T unit and/or a Q unit as a structural unit (s), and a Si content with respect to a total weight of the composite particles is 0.1 wt % or more and 23 wt % or less in terms of SiO 2 .

First claim

What is claimed is:

1. An organic-inorganic composite particle comprising a polyvinyl alcohol-based resin and a component having a three-dimensional siloxane crosslinked structure that is derived from a hydrolysis-polycondensation product of an alkoxysilane and/or a low condensate thereof,
wherein the alkoxysilane comprises a T unit and/or a Q unit as a structural unit(s), and
a silicon content with respect to a total weight of the composite particles is 0.1 wt % or more and 23 wt % or less in terms of SiO 2 ,
wherein the polyvinyl alcohol-based resin and the component having a three-dimensional siloxane crosslinked structure are arranged as a particle.

2. The organic-inorganic composite particle according to claim 1 ,
wherein the organic-inorganic composite particle has a structure in which the polyvinyl alcohol-based resin is coated with a SiO 2 layer comprising the three-dimensional siloxane crosslinked structure.

3. The organic-inorganic composite particle according to claim 1 ,
wherein the organic-inorganic composite particle has a structure in which the polyvinyl alcohol-based resin is coated with a hybrid film that comprises the component having the three-dimensional siloxane crosslinked structure and a water-soluble resin.

4. The organic-inorganic composite particle according to claim 3 ,
wherein the hybrid film has a silicon content of 15 wt % or more and less than 100 wt % in terms of SiO 2 .

5. The organic-inorganic composite particle according to claim 2 ,
wherein the component having the three-dimensional siloxane crosslinked structure exists in the vicinity of the surface of the polyvinyl alcohol-based resin.

6. The organic-inorganic composite particle according to claim 3 ,
wherein the component having the three-dimensional siloxane crosslinked structure exists in the vicinity of the surface of the polyvinyl alcohol-based resin.

7. The organic-inorganic composite particle according to claim 1 ,
wherein the component having the three-dimensional siloxane crosslinked structure uniformly exists inside the polyvinyl alcohol-based resin.

8. The organic-inorganic composite particle according to claim 1 ,
wherein the polyvinyl alcohol-based resin is a nonionic group-containing polyvinyl alcohol-based resin.

9. The organic-inorganic composite particle according to claim 1 ,
wherein the composite particles have a Si—O—C structure that is derived from a reaction between a hydroxy group of the polyvinyl alcohol-based resin and a hydroxy group of the hydrolysis-polycondensation product of the alkoxysilane and/or low condensate thereof.

10. A diverting agent comprising organic-inorganic composite particles according to claim 1 .

11. A lost circulation material comprising organic-inorganic composite particles according to claim 1 .

12. A fracture plugging method comprising a step of filling some of fractures formed in a well wall with the diverting agent according to claim 10 .

13. A method of preventing lost circulation of drilling mud,
wherein the method comprises a step of filling some of fractures formed in a well wall with the lost circulation material according to claim 11 .

14. The organic-inorganic composite particle according to claim 1 ,
wherein the organic-inorganic composite particle has the average particle size (d50) of 1 μm to 3,000 μm.

15. The organic-inorganic composite particle according to claim 1 ,
wherein the organic-inorganic composite particle is a powder or a pellet; the powder having a granular shape or a pearl shape; and the pellet having a cylindrical shape or a spherical shape.

Assignees

• Mitsubishi Chem Corp
• Nippon Synthetic Chem Ind Co Ltd

Inventors

• Katou Hanako
• Hirase Shouhei
• Watanabe Takumi
• Yoda Shoya
• Mandai Shusaku

Classifications

• C09K8/512

  containing cross-linking agents · CPC title

• C09D183/02

  Polysilicates · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C09D129/04 Primary

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title

• C09D183/04

  Polysiloxanes · CPC title