Polysiloxane defoaming agent

Patent metadata

Field	Value
Publication number	US-11298634-B2
Application number	US-201816650181-A
Country	US
Kind code	B2
Filing date	Sep 25, 2018
Priority date	Sep 27, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The invention relates to the use of a polysiloxane having a plurality of siloxane groups and at least one tertiary amide group covalently linked as a pending and/or terminal group to the polysiloxane, as a defoaming agent in a liquid composition.

First claim

The invention claimed is:

1. A process comprising: adding a polysiloxane to a non-aqueous liquid composition, the polysiloxane including a plurality of siloxane groups and 2 to 7 covalently linked tertiary amide groups as pending and/or terminal groups, wherein the polysiloxane does not contain fluorinated organic groups and has a number average molecular weight in the range of 800 to 8000 g/mol, wherein the polysiloxane is added to the non-aqueous liquid composition in an amount effective to reduce or eliminate foaming within a coating formed by spray application of the non-aqueous liquid composition.

2. The process according to claim 1 , wherein the tertiary amide group is a cyclic amide group.

3. The process according to claim 1 , wherein the tertiary amide group is a non-cyclic amide group.

4. The process according to claim 1 , wherein a covalent link between the polysiloxane and the 2 to 7 covalently linked tertiary amide groups contains the group —Si—O—CHR—, and wherein R represents hydrogen or an alkyl group.

5. The process according to claim 1 , wherein the polysiloxane further comprises a pending and/or terminal polyether segment.

6. The process according to claim 1 , wherein the polysiloxane contains between 0.0 and 10.0 mole % of non-tertiary amide groups, calculated on the number of tertiary amide groups.

7. The process according to claim 1 , wherein the amount of polysiloxane added to the non-aqueous liquid composition ranges from 0.100 to 2.000 wt.-%, based on the total weight of the non-aqueous liquid composition and the polysiloxane.

8. The process according to claim 1 , wherein the non-aqueous liquid composition is a coating composition.

9. The process according to claim 1 , wherein the non-aqueous liquid composition is a curable pre-polymer composition.

10. The process according to claim 1 , further comprising spraying the non-aqueous liquid composition.

11. The process according to claim 1 , further comprising coating a substrate with the non-aqueous liquid composition.

12. A process of preparing a coated substrate, the process comprising:
providing a non-aqueous liquid coating composition comprising a polysiloxane including a plurality of siloxane groups and 2 to 7 covalently linked tertiary amide groups as pending and/or terminal groups, wherein the polysiloxane does not contain fluorinated organic groups and has a number average molecular weight in the range of 800 to 8000 g/mol, wherein the polysiloxane is included in an amount effective to reduce or eliminate foaming within a coating formed by spray application of the non-aqueous liquid coating composition, and
applying the non-aqueous liquid coating composition to a substrate to provide a dry layer thickness of at least 50 μm.

13. The process according to claim 12 , wherein applying the non-aqueous liquid coating composition to the substrate comprises spraying of the non-aqueous liquid coating composition using a spraying device.

14. The process according to claim 13 , wherein the spraying device is an airless spray gun.

15. The process according to claim 12 , wherein the substrate is a transportation vehicle or a part thereof.

Assignees

• Byk Chemie Gmbh

Inventors

• Wintermeyer Verena
• Jaunky Guillaume Wojciech
• Süselbeck Mirco
• Kulessa Mathis
• Leutfeld Daniela

Classifications

• C08G77/46

  containing polyether sequences · CPC title

• B01D19/0495

  containing hetero rings · CPC title

• B05D1/02

  performed by spraying · CPC title

• C08G77/26

  nitrogen-containing groups · CPC title

• C09D7/47

  Levelling agents · CPC title