Coating material, related production method and use

• US 20050223945A1
• Filed: 06/30/2003
• Published: 10/13/2005
• Est. Priority Date: 07/31/2002
• Status: Active Grant

• Current Assignee: BASF Coatings AG (BASF SE)
• Original Assignee: BASF Coatings AG (BASF SE)
• Inventors: Baumgart, Hubert, Gebauer, Beate, Jurczik, Simone
• Granted Patent: US 7,153,357 B2
• Time in Patent Office: Days
• US Class Current: 106/481
• CPC Class Codes: C08G 18/6254 Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 5/033 characterised by the additives
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm

Abstract

A coating material comprising (A) at least one kind of hydrophobic nanoparticles based on silica and

• • (B) at least one kind of hydrophilic nanoparticles based on silica having a BET internal surface area of >300 m²/g; process for preparing it, and its use.

Claims

1. A coating material comprising

(A) at least one hydrophobic nanoparticles based on silica and

(B) at least one hydrophilic nanoparticles based on silica having a BET internal surface area of >

300 m²/g.

2. The coating material of claim 1, wherein the hydrophilic nanoparticles (B) have a BET internal surface area of >

340 m²/g.

3. The coating material of claim 1, wherein the weight ratio of hydrophobic nanoparticles (A) to hydrophilic nanoparticles (B) is from 1:

4 to 4;

1.

4. The coating material of claim 3, wherein the (A):

(B) weight ratio is from 3;

7 to 7;

3.

5. The coating material of claim 4, wherein the (A):

(B) weight ratio is from 2;

3 to 3;

2.

6. The coating material of claim 1, wherein the primary particle size of the nanoparticles (A) and (B) is <

35 nm.

7. The coating material of claim 6, wherein the primary particle size is <

20 nm.

8. The coating material of claim 7, wherein the primary particle size is <

10 nm.

9. The coating material of claim 1, wherein the hydrophobic nanoparticles (A) are obtained by surface modification of pyrogenic silica.

10. The coating material of claim 1, wherein the hydrophilic nanoparticles (B) comprise pyrogenic silica.

11. The coating material of claim 1, comprising the nanoparticles (A) and (B) in an amount of from 0.3 to 6% by weight, based on the total weight of the coating material.

12. The coating material of claim 11, comprising the nanoparticles (A) and (B) in an amount of from 0.8 to 3% by weight, based on the total weight of the coating material.

13. The coating material as claimed in claim 12, comprising the nanoparticles (A) and (B) in an amount of from 1 to 2.4% by weight, based on the total weight of the coating material.

14. A process for preparing the coating material of claim 1 comprising mixing and homogenizing the hydrophobic nanoparticles (A) and the hydrophilic nanoparticles (B) in the form of pigment pastes with the other constituents.

15. A process for preparing a scratch-resistant coated surface, comprising applying the coating material of claim 1 to a surface.

16. The process of claim 15 wherein the coating material of claim 1 is in the form of a molding or a film.

17. The process of claim 15 wherein the coating material is at least one component of an automotive multicoat paint system.