Aqueous coating composition and anti-glare coating formed thereform

Patent metadata

Field	Value
Publication number	US-9410053-B2
Application number	US-201314422594-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Sep 18, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

Provided is an aqueous coating composition including: particular amounts of certain first solid polymeric particles having an average diameter of 0.60-0.99 μm; certain second solid polymeric particles having an average diameter of 2-20 μm, and mixtures thereof; and, third solid polymeric particles having a calculated Tg of from −60 C to 120° C. and an average particle diameter of from 50 nm to 500 nm; wherein the second solid polymeric particles have a K10 value of less than 1.9E+10 N/m 2 ; wherein the difference between the refractive index of the outer surface of the second solid polymeric particles and the refractive index of the third solid polymeric particles is between 10E-4 to 10E-2; and wherein the aqueous coating composition comprises less than 10% by volume, inorganic extender particles. A method for providing a coating from the aqueous coating composition and a low glare coating so formed are also provided.

First claim

What is claimed is:

1. An aqueous coating composition comprising:
first solid polymeric particles selected from the group consisting of: multi-stage graded refractive index (grin) composition copolymer particles having an average diameter of 0.60-0.99 μm; multi-stage copolymer particles having an average diameter of 0.60-0.99 μm and a rubbery core having a calculated glass transition temperature (T g ) of 20° C. or less; and mixtures thereof;
second solid polymeric particles selected from the group consisting of: multi-stage graded refractive index (grin) composition copolymer particles having an average diameter of 2-20 μm; multi-stage copolymer particles having an average diameter of 2-20 μm and a rubbery core having a calculated glass transition temperature (T g ) of 20° C. or less; and mixtures thereof; and, third solid polymeric particles having a calculated Tg of from −60° C. to 120° C. and an average particle diameter of from 50 nm to 500 nm;
wherein the dry weight ratio of said first solid polymeric particles to said second solid polymeric particles is from 0.25:1 to 2:1; wherein the dry weight ratio of the sum of said first solid polymeric particles and said second solid polymeric particles to said third solid polymeric particles is from 0.15:1 to 10:1; wherein said second solid polymeric particles have a K10 value of less than 1.9E+10 N/m 2 ; wherein the difference between the refractive index of the outer surface of said second solid polymeric particles and the refractive index of said third solid polymeric particles is between 10E-4 to 10E-2; and wherein said aqueous coating composition comprises less than 10% by volume, inorganic extender particles.

2. The aqueous coating composition of claim 1 , wherein said first solid polymeric particles are selected from the group consisting of acrylic multi-stage copolymer particles, vinyl multi-stage copolymer particles, multi-stage synthetic rubber copolymer particles, multi-stage urethane copolymer particles, water-dispersible graft copolymer particles, mixtures thereof, and mixtures thereof with a single stage crosslinked (co)polymer.

3. The aqueous coating composition of claim 1 , wherein said first solid polymeric particles, said second solid polymeric particles; and said third solid polymeric particles are acrylic polymers.

4. The aqueous coating composition of claim 3 , wherein said third solid polymeric particles are two-stage acrylic emulsion copolymer particles.

5. The aqueous coating composition of claim 1 further comprising pigment particles.

6. A method for providing a coating comprising:
(a) forming said aqueous coating composition of claim 1 ;
(b) applying said aqueous coating composition to a substrate; and,
drying, or allowing to dry, said aqueous coating composition

wherein said provided coating has a 60° specular gloss of from 5 to 25.

7. A coating provided by the method of claim 6 further comprising pigment particles.

8. The coating of claim 7 wherein said coating is below its critical pigment volume concentration.

Assignees

• Rohm & Haas

Inventors

• Kamel Nader N
• La Fleur Edward
• Majumdar Partha S
• Nungesser Edwin Hugh

Classifications

• C08L2203/16

  used for films · CPC title

• C09D151/003 Primary

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C09D151/04, C09D151/06 take precedence) · CPC title

• C09D5/006

  Anti-reflective coatings · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title