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US 8,853,301 B2Granted
Aqueous coating composition comprising spherical silica particles and method of making and using the same
Assignee3M Innovative Properties Company
InventorsNaiyong Jing, Yifan Zhang, Justin A. Riddle
Life of this patent
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Abstract
Compositions include a polymer and silica nanoparticles dispersed in an aqueous continuous liquid phase. The polymer is a water-soluble copolymer of acrylic acid and an acrylamide, or a salt of the same. Methods of making and using the compositions to coat a substrate are also disclosed.
Claims15
A composition comprising:
- an aqueous continuous liquid phase;
- spherical silica particles dispersed in the aqueous continuous liquid phase, wherein the spherical silica particles have a volume average particle diameter of 60 nanometers or less;
- and
- a water-soluble copolymer of acrylic acid and an acrylamide, or a salt thereof, wherein the acrylamide is represented by the formula
- wherein R1 is H or a methyl group, and wherein a weight ratio of the acrylamide to the acrylic acid is in a range of from 20:80 to 95:5, and
- wherein a weight ratio of the spherical silica particles to the water-soluble copolymer of acrylic acid and an acrylamide, or a salt thereof, is in a range of from 70:30 to 97:3, and wherein the composition has a pH of less than 3.
3 more elements
A method of making a composition, the method comprising combining:
- an aqueous dispersion of spherical silica particles, wherein the spherical silica particles have a volume average particle diameter of 60 nanometers or less, and
- an aqueous solution comprising a water-soluble copolymer of acrylic acid and an acrylamide, or a salt thereof, wherein the acrylamide is represented by the formula
- to provide a composition, wherein R1 is H or a methyl group, and wherein a weight ratio of the acrylic acid to the acrylamide is in a range of from 20:80 to 95:5, and wherein a weight ratio of the spherical silica particles to the water-soluble copolymer of acrylic acid and an acrylamide, or a salt thereof, is in a range of from 70:30 to 97:3;
- and
- contacting the composition with a protonated cation exchange resin, wherein the composition has a pH of less than 3.
2 more elements
Dependencies are inferred from the claim text.