Aqueous coating composition, aqueous coating material kit and article having coated film

Patent metadata

Field	Value
Publication number	US-10017658-B2
Application number	US-201514923465-A
Country	US
Kind code	B2
Filing date	Oct 27, 2015
Priority date	May 27, 2013
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

To provide an aqueous coating composition with which a coating film having a sufficient self-cleaning function can be formed even in a case where an aqueous fluorinated resin dispersion is blended as an aqueous synthetic resin dispersion or a case where an isocyanate compound is contained as a curing agent can be formed; an aqueous coating material kit with which the aqueous coating composition can be obtained; and an article having a coated film having a sufficient self-cleaning function.
An aqueous coating composition, which comprises an aqueous synthetic resin dispersion and a urethane polyol, wherein the urethane polyol is a reaction product of a polyoxyalkylene diol having as units an oxyalkylene group of a structure such that an oxygen atom is bonded to one end of a branched alkylene group, and an aliphatic diisocyanate.

First claim

What is claimed is:

1. An aqueous coating composition, which comprises an aqueous synthetic resin dispersion and a urethane polyol,
wherein the urethane polyol is a reaction product of a polyoxyalkylene diol having as units an oxyalkylene group of a structure such that an oxygen atom is bonded to one end of a branched alkylene group, and an aliphatic diisocyanate,
wherein at least part of the synthetic resin in the aqueous synthetic resin dispersion is a fluorinated resin, and
wherein a hydroxy value of the fluorinated resin is at least 20 mgKOH/g,
and wherein:
the fluorinated resin is a fluorinated copolymer (A1p) having structural units based on the following monomer (m1), structural units based on the following monomer (m2) and structural units based on the following monomer (m3):
monomer (m1): a fluoroolefin,
monomer (m2): a macromonomer having a hydrophilic moiety, and
monomer (m3): a hydroxy group-containing monomer represented by the following formula (m3):
R 1 —R 2 —OH  (m3)

wherein R 1 is a group having a radical polymerizable unsaturated group, and

R 2 is a n-nonylene group or a cyclohexane-1,4-dimethylene group; or
the fluorinated resin is a fluorinated copolymer (A2p) having from 40 to 60 mol % of structural units represented by the following formula (a1), from 3 to 50 mol% of structural units represented by the following formula (a2), from 4 to 30 mol % of structural units represented by the following formula (a3) and from 0.4 to 7 mol % of structural units represented by the following formula (a4), with the proviso that the total amount of the structural units represented by the formula (a1), the structural units represented by the formula (a2), the structural units represented by the formula (a3) and the structural units represented by the formula (a4) is from 80 to 100 mol %:

wherein each of X 1 and X 2 which are independent of each other, is a hydrogen atom, a chlorine atom or a fluorine atom, X 3 is a hydrogen atom, a chlorine atom, a fluorine atom or —CY 1 Y 2 Y 3 , and each of Y 1 , Y 2 and Y 3 which are independent of one another, is a hydrogen atom, a chlorine atom or a fluorine atom,

wherein R a is a hydrogen atom or a methyl group, R 11 is a C 1-12 alkyl group or a C 4-10 monovalent alicyclic group, u is an integer of from 0 to 8, and v is 0 or 1,

wherein R b is a hydrogen atom or a methyl group, R 12 is a C 1-10 alkylene group or a C 4-10 bivalent alicyclic group, w is an integer of from 0 to 8, and x is 0 or 1,

wherein R c is a hydrogen atom or a methyl group, R 13 is a C 1-10 alkylene group or a C 4-10 bivalent alicyclic group, R 14 is a C 2-10 alkylene group or a C 4-10 bivalent alicyclic group, R 15 is —OH or —O −+ NHZ 1 Z 2 Z 3 , each of Z 1 , Z 2 and Z 3 which are independent of one another, is a hydrogen atom, a C 1-4 alkyl group or a C 1-6 hydroxyalkyl group, at least some of R 15 are

—O −+ NHZ 1 Z 2 Z 3 , y is an integer of form 0 to 8, and z is 0 or 1.

2. The aqueous coating composition according to claim 1 , wherein the oxyalkylene group is an oxypropylene group.

3. The aqueous coating composition according to claim 1 , wherein the urethane polyol is a reaction product of polypropylene glycol having 2 to 6 oxypropylene groups, and an alkylene diisocyanate having a C 4 - 10 alkylene group.

4. The aqueous coating composition according to claim 3 , wherein the alkylene group of the alkylene diisocyanate is a branched alkylene group.

5. The aqueous coating composition according to claim 1 , wherein the urethane polyol has a number average molecular weight of from 1,000 to 30,000 and a hydroxy value of from 50 to 500 mgKOH/g.

6. The aqueous coating composition according to claim 1 , wherein the content of the urethane polyol is from 0.5 to 30 parts by mass per 100 parts by mass of the solid content in the aqueous synthetic resin dispersion.

7. The aqueous coating composition according to claim 1 , which further contains a curing agent.

8. The aqueous coating composition according to claim 7 , wherein the curing agent is an isocyanate compound.

9. An article having a coated film formed by coating the article with the aqueous coating composition according to claim 1 .

10. An aqueous coating material kit comprising the aqueous coating composition according to claim 1 , and an aqueous solution or aqueous dispersion of an isocyanate compound.

11. An article having a coated film formed by coating the article with the aqueous coating material kit according to claim 10 .

12. A kit for preparation of an aqueous coating material, to be used to prepare the aqueous coating composition as defined in claim 1 , which comprises the aqueous synthetic resin dispersion and an aqueous solution or aqueous dispersion of the urethane polyol.

13. An aqueous coating composition, which comprises an aqueous synthetic resin dispersion and a urethane polyol,
wherein the urethane polyol is a reaction product of a polyoxyalkylene diol having as units an oxyalkylene group of a structure such that an oxygen atom is bonded to one end of a branched alkylene group, and an aliphatic diisocyanate,
wherein the alkylene group of the alkylene diisocyanate is a branched alkylene group.

14. The aqueous coating composition according to claim 13 , wherein the urethane polyol is a reaction product of polypropylene glycol having 2 to 6 oxypropylene groups, and an alkylene diisocyanate having a C 4-10 alkylene group.

15. The aqueous coating composition according to claim 13 , wherein the urethane polyol has a number average molecular weight of from 1,000 to 30,000 and a hydroxy value of from 50 to 500 mgKOH/g.

16. The aqueous coating composition according to claim 13 , wherein the content of the urethane polyol is from 0.5 to 30 parts by mass per 100 parts by mass of the solid content in the aqueous synthetic resin dispersion.

17. The aqueous coating composition according to claim 13 , wherein at least part of the synthetic resin in the aqueous synthetic resin dispersion is a fluorinated resin.

18. The aqueous coating composition according to claim 17 , wherein the fluorinated resin is a fluorinated copolymer (A1p) having structural units based on the following monomer (m1), structural units based on the following monomer (m2) and structural units based on the following monomer (m3):
monomer (m1): a fluoroolefin,
monomer (m2): a macromonomer having a hydrophilic moiety, and
monomer (m3): a hydroxy group-containing monomer represented by the following formula (m3):
R 1 —R 2 —OH  (m3)

wherein R 1 is a group having a radical polymerizable unsaturated group, and R 2 is a n-nonylene group or a cyclohexane-1,4-dimethylene group.

19. The aqueous coating composition according to claim 17 , wherein the fluorinated resin is a fluorinated copolymer (A2p) having from 40 to 60 mol % of structural units represented by the following formula (a1), from 3 to 50 mol % of structural units represented by the following formula (a2), from 4 to 30 mol % of structural units represe

Assignees

• Asahi Glass Co Ltd

Inventors

• Aikawa Masataka
• Saito Shun

Classifications

• C08G18/6279

  containing fluorine atoms · CPC title

• C09D157/08

  containing halogen atoms · CPC title

• C09D5/02

  Emulsion paints {including aerosols} · CPC title

• C09D201/00

  Coating compositions based on unspecified macromolecular compounds · CPC title

• C09D127/12 Primary

  containing fluorine atoms · CPC title