Voided latex particles containing functionalized outer shells

Patent metadata

Field	Value
Publication number	US-11802173-B2
Application number	US-202117498042-A
Country	US
Kind code	B2
Filing date	Oct 11, 2021
Priority date	Aug 4, 2015
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

The wet adhesion of a coating composition may be improved through the use of voided latex particles as opacifying agents which contain a hollow interior as well as an outer shell of a polymer containing functional groups such as amino, 1,3-diketo, urea or ureido. Other types of functional groups may be introduced to the outer shell polymer in order to vary other desired characteristics of the coating. The voided latex particles are non-film-forming.

First claim

The invention claimed is:

1. A voided latex particle comprising a hollow interior and an outer shell, wherein the outer shell is comprised of an outer shell polymer having a Tg above 45° C. and bearing 0.5 to 5 weight percent of one or more functional groups selected from 1,3-diketo, amino, hydroxyl, polyether, silane, phosphate, epoxy, fluorocarbon, aldehyde, ketone, acetoacetyl, functional groups or combinations thereof, wherein the outer shell copolymer is a copolymer of a vinyl aromatic monomer and a free radical polymerizable ethylenically unsaturated monomer containing said one or more functional group(s), the copolymer comprising 0.1 to 10 weight % of the free radical polymerizable ethylenically unsaturated monomer containing said one or more functional groups, wherein the voided latex particle is an opacifier which is opaque and non-film-forming at temperatures at or above 15° C., and at or below 45° C., and wherein only the outer shell of said voided latex particle is functionalized with said one or more functional groups.

2. The voided latex particle of claim 1 , wherein the outer shell polymer is a copolymer of a vinyl aromatic polymer and a free radical polymerizable ethylenically unsaturated monomer containing a silane functional group.

3. The voided latex particle of claim 2 , wherein the vinyl aromatic monomer comprises styrene.

4. The voided latex particle of claim 1 , wherein the free radical polymerizable ethylenically unsaturated monomer contains a (meth)acrylate or (meth)acrylamide group.

5. The voided latex particle of claim 1 , wherein the free radical polymerizable ethylenically unsaturated monomer is an imidazolidinone (meth)acrylic monomer.

6. The voided latex particle of claim 1 , wherein the free radical polymerizable ethylenically unsaturated monomer is selected from the group consisting of 2-(2-oxo-1-imidazolidinyl)ethyl (meth)acrylates and N-(2-(2-oxo-1-imidazolidinyl)ethyl (meth)acrylamides.

7. The voided latex particle of claim 1 , wherein the functional groups are introduced to the outer shell polymer by polymerization of one or monomers bearing the functional groups.

8. The voided latex particle of claim 1 , wherein the functional groups are introduced to the outer shell polymer by reacting a precursor polymer with a functionalization agent capable of forming the functional groups.

9. The voided latex particle of claim 2 , wherein the free radical polymerizable ethylenically unsaturated monomer is selected from the group consisting of acetoacetoxy(meth)acrylates, allyl acetoacetate, methylolated diacetone (meth)acrylamides, aminoalkyl(meth)acrylates, and ethylenically unsaturated polymerizable aziridinyl monomers.

10. The voided latex particle of claim 1 , wherein the voided latex particle further comprises at least one intermediate encapsulating polymer between the hollow interior and the outer shell.

11. The voided latex particle of claim 10 , wherein the intermediate encapsulating polymer comprises at least one non-ionic monoethylenically unsaturated monomer and at least one crosslinking agent.

12. The voided latex particle of claim 1 , wherein the outer shell polymer has a glass transition temperature of at least 60° C.

13. A coating composition comprising the voided latex particles in accordance with claim 1 .

14. The coating composition of claim 13 , further comprising film-forming latex particles.

15. The coating composition of claim 14 , wherein at least a portion of the film-forming latex particles bear functional groups capable of interacting with the functional groups present in the outer shell polymer.

16. The coating composition of claim 13 , further comprising at least one non-polymeric compound bearing two or more functional groups per molecule capable of interacting with functional groups present in the outer shell polymer.

17. The coating composition of claim 14 , wherein said film-forming latex particles are acrylic or vinyl acrylic latex.

18. A paint comprising the coating composition of claim 14 .

19. The paint composition of claim 18 , wherein said latex is an acrylic, styrene acrylic or vinyl acrylic latex.

20. The paint composition of claim 18 , further comprising one or more of coalescing solvents, biocides, pigments, fillers, titanium dioxide, calcium carbonate, thickeners, leveling agents, pH adjusting agents, surfactants, or antifreeze agents.

Assignees

• Arkema Inc

Inventors

• Olesen Keith R
• Boudreaux Matthew F
• Liu Lily

Classifications

• C08F265/06 Primary

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

• B01J13/16

  Interfacial polymerisation · CPC title

• B01J13/203

  Exchange of core-forming material by diffusion through the capsule wall · CPC title

• C08F2/22

  Emulsion polymerisation · CPC title

• C08F212/08

  Styrene · CPC title