Aqueous coating composition and coating formed therefrom having a particular gloss profile

Patent metadata

Field	Value
Publication number	US-9458347-B2
Application number	US-201314419802-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Sep 18, 2012
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

An aqueous coating composition including: certain first solid polymeric particles having an average diameter of 0.60-0.99 μm and certain second 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 the first solid polymeric particles to the second solid polymeric particles is from 0.15:1 to 10:1; and the aqueous coating composition includes less than 10% by volume, inorganic extender particles is provided. Also provided is a coating having a ratio of 85° specular gloss to 20° specular gloss equal to or greater than 33 formed from the aqueous coating composition.

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; and
second solid polymeric particles having a calculated T g 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 the first solid polymeric particles to the second solid polymeric particles is from 0.15:1 to 10:1 and the aqueous coating composition comprises less than 10% by volume of inorganic extender particles.

2. The aqueous coating composition of claim 1 , wherein the 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, combinations thereof, and mixtures thereof with a single stage crosslinked (co)polymer.

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

4. The aqueous coating composition of claim 3 , wherein the second 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 the aqueous coating composition of claim 1 ;
(b) applying the coating composition to a substrate; and
(c) drying, or allowing to dry, the coating composition.

7. A coating formed by the method of claim 6 , wherein the ratio of the 85° specular gloss to the 20° specular gloss is equal to or greater than 33.

8. The coating of claim 7 , further comprising pigment particles.

9. The coating of claim wherein the coating is below its critical pigment volume concentration.

Assignees

• Rohm & Haas

Inventors

• La Fleur Edward
• Majumdar Partha S
• Nungesser Edwin Hugh

Classifications

• C09D151/003

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

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08F265/06

  Polymerisation of acrylate or methacrylate esters on to polymers thereof · CPC title

• C08L51/003

  grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence) · CPC title