1K 100% solids dry-erase coating composition

Patent metadata

Field	Value
Publication number	US-10106703-B2
Application number	US-201715604766-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 27, 2016
Publication date	Oct 23, 2018
Grant date	Oct 23, 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 providing an aminoalkoxysilane, and in the substantial absence of water, reacting a portion of the aminoalkoxysilane with a carbonate and reacting a portion of the aminoalkoxysilane with an epoxy compound. These reactions will result in a coating composition that comprises a mixture of alkoxysilylamines and alkoxysilylcarbamates. The coating composition can also include an alkyl amine in an amount effective to catalytically deprotect alkoxy groups to yield silanol groups, facilitating fast crosslinking.

First claim

What is claimed is:

1. A method of making a coating composition, the method comprising:
providing an aminoalkoxysilane;
in the substantial absence of water, reacting a portion of said aminoalkoxysilane with a carbonate and reacting a portion of said aminoalkoxysilane with an epoxy compound of the following formula (8)

wherein A 4 -A 6 are the same or different and comprise hydrogen or a carbon-containing group with one to three carbon atoms, A 7 is a carbonyl-containing linking group, and R 19 is an aliphatic group having at least four carbon atoms; and
the reactions yielding a mixture of alkoxysilylamines and alkoxysilylcarbamates;
the method including providing an alkylamine in an amount effective to catalytically deprotect alkoxy groups in said alkoxysilylamines to yield silanol groups.

2. The method according to claim 1 , the method comprising:
adding said epoxy compound to said aminoalkoxysilane to form a reacted blend, and
subsequently adding said carbonate to said blend.

3. The method according to claim 1 , said aminoalkoxysilane being present in an amount of 1.5 to 2.5 parts, said epoxy compound being present in an amount of 0.5 to 1.5 parts, and said carbonate being present in an amount of 1.0 to 2.0 parts, relative to one another.

4. The method according to claim 1 , said epoxy compound comprising a glycidyl aliphatic ester.

5. The method according to claim 4 , the glycidyl aliphatic ester having the following formula (9)

wherein R 19 is an aliphatic group having at least four carbon atoms.

6. The method according to claim 1 , the aminoalkoxysilane having a structure represented by the following formula (1):

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

7. The method according to claim 6 , the aminoalkoxysilane comprising an aminopropyl trialkoxysilane.

8. The method according to claim 2 , the aminoalkoxysilane comprising aminopropyl trimethoxysilane.

9. The method according to claim 1 , said mixture of alkoxysilylamines and alkoxylsilylcarbamates comprising at least two of (10), (11), and (12):

where A 1 , A 2 , and A 3 are the same or different and comprise hydrogen or C 1 -C 4 alkyl, with the proviso that at least one of A 1 , A 2 , and A 3 comprises C 1 -C 4 alkyl, where R 1 is C 1 -C 4 alkyl, and wherein R 20 is a hydroxyalkylcarbamate.

10. The method according to claim 9 , said mixture of alkoxysilylamines and alkoxylsilylcarbamates comprising a mixture of all three of (10), (11), and (12).

11. The method according to claim 9 , said mixture of alkoxysilylamines and alkoxysilylcarbamates comprising at least two of (13), (14), (15):

12. The method according to claim 1 , the carbonate having a formula according to the following formula (2):

R 2 and R 3 each independently including an alkyl group, or R 2 and R 3 forming a cyclic structure that may include any one or more of an alkyl group, a hydroxyalkyl group, and a hydroxyl group as substituents.

13. The method according to claim 12 , the carbonate comprising glycerol carbonate.

14. The method according to claim 1 , the alkylamine comprising dibutyl amine.

15. The method according to claim 1 , further including adding a spacer.

16. The method according to claim 15 , said spacer comprising polyethylene glycol.

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

18. The method according to claim 17 , the pigment including titanium dioxide.

Assignees

• Sherwin Williams Co

Inventors

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

Classifications

• C08G77/60

  in which all the silicon atoms are connected by linkages other than oxygen atoms · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• C09D11/17

  characterised by colouring agents · CPC title

• B43L1/002

  chemical details · CPC title

• B43L1/10

  Writing surfaces thereof · CPC title