1K waterborne dry-erase coating composition

Patent metadata

Field	Value
Publication number	US-10125281-B2
Application number	US-201715604732-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 27, 2016
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

Disclosed is a coating composition suitable for coating onto a wall or other substrate to yield a dry-erase coating. The composition may be prepared by reacting an excess amount of an aminosilane with a carbonate in aqueous media to yield a silylurethane, introducing an epoxysilane, and allowing the epoxysilane to react with the aminosilane to yield an aminodisilane. This reaction will result in a coating composition that comprises the silylurethane and the aminodisilane. The aqueous mixture of the silylurethane and the aminodisilane together constitute a coating composition that, upon curing, forms a dry-erase coating.

First claim

What is claimed is:

1. A method of making a coating composition, the method comprising:
reacting an excess amount of an aminosilane with a carbonate in aqueous media to yield a silylurethane,
introducing an epoxysilane, and allowing the epoxysilane to react with said aminosilane to yield an aminodisilane monomer, thereby resulting in a coating composition that comprises said silylurethane crosslinker and said aminodisilane crosslinker.

2. The method according to claim 1 , comprising preparing said silylurethane crosslinker and said aminodisilane crosslinker in a single reaction vessel.

3. The method according to claim 1 , wherein the aminosilane has a structure represented by the following formula (1):

wherein A 1 , A 2 , and A 3 are the same or different and are hydrogen or C 1 -C 4 alkyl, B 1 and B 2 are the same or different and are hydrogen or C 1 -C 4 alkyl, with the proviso that at least one of B 1 and B 2 is hydrogen, and R is C 1 -C 4 alkyl.

4. The method according to claim 3 , where each of A 1 , A 2 , and A 3 is hydrogen.

5. The method according to claim 4 , wherein the aminosilane is aminopropyltrisilanol.

6. The method according to claim 3 , where each of A 1 , A 2 , and A 3 is C 1 -C 4 alkyl.

7. The method according to claim 6 , wherein the aminosilane is an aminopropyl trialkoxysilane.

8. The method according to claim 7 , wherein the aminosilane is aminopropyl trimethoxvsilane.

9. The method according to claim 1 , wherein the carbonate has a formula according to the following formula (2):

wherein R 2 and R 3 are independently an alkyl group, or R 2 and R 3 form a cyclic structure optionally including one or more of an alkyl group, a hydroxyalkyl group, and a hydroxyl group as substituents.

10. The method according to claim 9 , wherein the carbonate is glycerol carbonate.

11. The method according to claim 1 , wherein the epoxysilane has a structure according to the following formula (3):

wherein R 4 is any one or more of an alkyl group, a branched alkyl group, an ester group, and an ether group, R 5 to R 7 being the same or different and are alkyl groups, and R 8 and R 9 being the same or different and are hydrogen or C 1 -C 4 alkyl.

12. The method according to claim 11 , wherein the epoxysilane is glycidoxypropyltrimethoxysilane.

13. The method according to claim 1 , wherein the epoxysilane has a structure according to the following formula (4):

wherein R 10 is any one or more of an alkyl group, a branched alkyl group, an ester group, and an ether group, R 11 is an alkyl group, and n is an integer from 1-100.

14. The method according to claim 1 , wherein the epoxysilane has a structure according to the following formula (5):

wherein R 12 and R 13 are a cyclic carbon structure, and R 14 is any one or more of an alkyl group, a branched alkyl group, an ester group, and an ether group, and A 1 , A 2 , and A 3 are the same or different and are hydrogen or C 1 -C 4 alkyl.

15. The method according to claim 1 , including maintaining the reaction pH to a pH between 6 and 11.

16. The method according to claim 1 , further including adding a plasticizer.

17. The method of claim 16 , wherein said plasticizer is polyethylene glycol.

18. The method according to claim 1 , further including adding a pigment.

19. The method according to claim 18 , the pigment including titanium dioxide.

Assignees

• Sherwin Williams Co

Inventors

• Makowski Brian
• Markovitz Ii Frank F
• Reimann Jay A
• Shah Shailesh S
• Wendland Tom

Classifications

• C09D183/08

  containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen · CPC title

• B43L1/10

  Writing surfaces thereof · CPC title

• C09D11/17

  characterised by colouring agents · CPC title

• B43L1/002

  chemical details · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title