Polyester silicates

Patent metadata

Field	Value
Publication number	US-9518196-B2
Application number	US-201314655966-A
Country	US
Kind code	B2
Filing date	Dec 30, 2013
Priority date	Jan 4, 2013
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

Provided herein are coating compositions comprising the reaction product of a tetra alkyoxyorthosilicate or a partially condensed oligomer thereof and a polyester resin containing hydroxyl groups. The coating compositions advantageously have a high solid content and/or low volatile organic content (VOC) in combination with a low viscosity. The coating compositions are capable of drying quickly, curing in ambient conditions and may be formulated in one-pack.

First claim

The invention claimed is:

1. An ambient curing coating composition comprising a reaction product of a tetra alkyoxyorthosilicate or a partially condensed oligomer thereof and a polyester resin containing hydroxyl groups, wherein
(a) the polyester resin has a number average molecular weight of between about 1250 and about 4000, and a hydroxyl equivalent weight of between about 800 and about 4500, and
(b) the ratio of alkoxy groups on the tetra alkyoxyorthosilicate to hydroxyl groups on the polyester resin containing hydroxyl groups is in the range of 2:1 to 40:1.

2. The ambient curing coating composition of claim 1 , wherein the reaction product is prepared from 15 to 40 weight % of the tetra alkyoxyorthosilicate or partially condensed oligomer thereof, and 60 to 85 weight % of the polyester resin containing hydroxyl groups, wherein weight % is based on the total weight of non volatile components in the composition used to prepare the reaction product.

3. The ambient curing coating composition of claim 1 , wherein the polyester resin containing hydroxyl groups is ethylenically unsaturated.

4. The ambient curing coating composition of claim 1 , wherein the polyester resin containing hydroxyl groups comprises less than two hydroxyl groups per molecule.

5. The ambient curing coating composition of claim 1 , wherein the tetra alkyoxyorthosilicate or the partially condensed oligomer thereof, is a tetra-C1-C5 alkyoxyorthosilicate or a partially condensed oligomer thereof.

6. The ambient curing coating composition of claim 1 , wherein the polyester resin has a number average molecular weight of between about 1250 and about 2500, and a hydroxyl equivalent weight of between about 800 and about 3000.

7. The ambient curing coating composition of claim 1 , wherein said coating composition has at least one of a solids content of at least 70 vol % or a volatile organic content (VOC) not exceeding 250 g/l.

8. The ambient curing coating composition of claim 1 , wherein the polyester resin containing hydroxyl groups is an alkyd resin.

9. A one-pack coating composition, comprising the ambient curing coating composition of claim 1 .

10. A silicate-modified polyester resin obtained by dealcoholisation condensation of a tetra-alkoxyorthosilicate or a partially condensed oligomer thereof and a polyester resin which contains hydroxyl groups, wherein
(a) the polyester resin has a number average molecular weight of between about 1250 and about 4000, and a hydroxyl equivalent weight of between about 800 and about 4500, and
(b) the ratio of alkoxy groups on the tetra alkyoxyorthosilicate to hydroxyl groups on the polyester resin containing hydroxyl groups is in the range of 2:1 to 40:1.

11. A process for the preparation of the silicate-modified polyester resin according to claim 10 , the process comprising heating, in the presence of a catalyst, a mixture of the alkoxyorthosilicate or the partially condensed oligomer thereof with the polyester resin which contains hydroxyl groups.

12. A process for coating a substrate comprising the steps of (i) applying on the substrate the coating composition according to claim 1 , and (ii) curing the applied coating composition.

13. The process according to claim 12 wherein the curing is performed at a temperature in the range of −5° C. to 30° C.

14. A coated substrate obtained by the process of claim 12 .

15. The ambient curing coating composition of claim 2 , wherein the polyester resin containing hydroxyl groups is ethylenically unsaturated.

16. The ambient curing coating composition of claim 3 , wherein the polyester resin containing hydroxyl groups comprises less than two hydroxyl groups per molecule.

17. The ambient curing coating composition of claim 4 , wherein the tetra alkyoxyorthosilicate or the partially condensed oligomer thereof, is a tetra-C1-C5 alkyoxyorthosilicate or a partially condensed oligomer thereof.

18. The ambient curing coating composition of claim 3 , wherein the polyester resin has a number average molecular weight of between about 1250 and about 2500, and a hydroxyl equivalent weight of between about 800 and about 3000.

19. The ambient curing coating composition of claim 4 , wherein said coating composition has at least one of a solids content of at least 70 vol % or a volatile organic content (VOC) not exceeding 250 g/l.

20. The ambient curing coating composition of claim 7 , wherein the polyester resin containing hydroxyl groups is an alkyd resin.

Assignees

• Akzo Nobel Coatings Int Bv

Inventors

• Nixon Steven Alister
• Pritchard Susan
• Donnely Sarah

Classifications

• C08G83/001

  Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica · CPC title

• C08G77/445

  containing polyester sequences · CPC title

• C09D183/10 Primary

  Block or graft copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09D151/08, C09D153/00) · CPC title

• C08G63/6958

  Polycarboxylic acids and polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation · CPC title

• C09D167/03 Primary

  the dicarboxylic acids and dihydroxy compounds having the carboxyl - and the hydroxy groups directly linked to aromatic rings · CPC title