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US 8,568,783 B2Granted
Hydrophilized substrate, dispersion, and making method
AssigneeShin-Etsu Chemical Co., Ltd.
InventorMasahiro Amemiya
Life of this patent
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Abstract
A powder is hydrophilized by treating surfaces of particles with a hydrolyzable silyl group-containing acid anhydride compound, dispersing the surface treated particles in water, adding a base, and heating the dispersion for thereby hydrolyzing the acid anhydride moiety to open its ring and neutralizing the resultant carboxylic acid with the base. The hydrophilized powder is fully dispersible in aqueous media.
Claims17
A method for preparing a hydrophilized substrate, comprising:
- (A) treating a surface of a substrate with a hydrolyzable silyl group-containing acid anhydride compound having the general formula (1):
- wherein
- R1 is hydrogen or C1-C6 alkyl,
- R2 is each independently an organic group selected from the group consisting of C1-C30 alkyl, aryl, aralkyl, and fluoroalkyl,
- A is a straight or branched C2-C6 alkylene,
- a is an integer of 1 to 3,
- b is an integer of 0 to 2, and
- a+b=3,
- (B) immersing the surface treated substrate in water or a mixture of water and a solvent, adding a base thereto, and heating the liquid for thereby hydrolyzing the acid anhydride moiety to open its ring and neutralizing the resultant carboxylic acid, and
- (C) removing water and the solvent until the substrate is dry.
7 more elements
A method for preparing a dispersion of hydrophilized powder, comprising:
- (A) treating surfaces of powder particles with a hydrolyzable silyl group-containing acid anhydride compound having the general formula (1):
- wherein
- R1 is hydrogen or C1-C6 alkyl,
- R2 is each independently an organic group selected from the group consisting of C1-C30 alkyl, aryl, aralkyl, and fluoroalkyl,
- A is a straight or branched C2-C6 alkylene,
- a is an integer of 1 to 3,
- b is an integer of 0 to 2, and
- a+b=3,
- (B) immersing the surface treated powder in water or a mixture of water and a solvent, adding a base thereto, and heating the liquid for thereby hydrolyzing the acid anhydride moiety to open its ring and neutralizing the resultant carboxylic acid, and
- (C) feeding the liquid from step (B) to a dispersing machine for finely dispersing the powder particles.
7 more elements
Dependencies are inferred from the claim text.