Hydrophobic coating compositions, articles coated with said compositions, and processes for manufacturing same

• US 6,663,941 B2
• Filed: 09/05/2002
• Issued: 12/16/2003
• Est. Priority Date: 02/03/1997
• Status: Expired due to Term

• Current Assignee: Cytonix LLC (Thermo Fisher Scientific Incorporated)
• Original Assignee: Cytonix Corporation (Thermo Fisher Scientific Incorporated)
• Inventors: Schneider, Richard A., Brown, James F.
• Primary Examiner(s): Nakarani, D. S.
• Application Number:
  US10/235,140
• Publication Number:
  US 20030017349A1
• Time in Patent Office: 467 Days
• Field of Search: 428/447, 428/451, 428/450, 428/141, 524/462, 524/463, 524/588, 524/858, 528/12
• US Class Current: 428/141
• CPC Class Codes: B01L 3/50 Containers for the purpose of retaining a material to be analysed, e.g. test tubes devices for taking samples of blood A61B5/15
• CPC Class Codes: C08L 2205/18 Spheres
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/14 Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 2666/54 Inorganic substances
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene
• CPC Class Codes: C09D 127/18 Homopolymers or copolymers of tetrafluoroethene
• CPC Class Codes: C09D 133/16 Homopolymers or copolymers of esters containing halogen atoms
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product

Abstract

Hydrophobic coating compositions are provided as are processes to coat articles with the compositions. Extremely hydrophobic coatings are provided by the compositions. Durable, weatherable and scratch-resistant coatings are provided by compositions comprising a trifluoromethyl-containing component and a hardenable material. Processes are also provided for forming hydrophobic coatings on articles without any substantial loss of fluorocarbon solvent used in the coating composition. Articles are coated on a surface thereof with a hydrophobic coating reactant or reaction product which forms a coating having an exposed surface populated with 30% by area or more terminal trifluoromethyl groups.

Claims

1. A composition comprising (i) a fluorosilane, (ii) a fluorinated acid anhydride or fluoroanhydride, and (iii) a fluorinated solvent, and (iv) a trifluromethyl group-containing agent

said composition capable of providing a coating having an exposed coating surface area populated with at least about 30% by area trifluoromethyl groups and a surface energy of about 22 dynes/cm or lower at 20°

C.

2. The composition of claim 1, wherein said fluorosilane comprises a fluoroalkyl alkoxysilane.

3. The composition of claim 1, wherein said fluorinated acid anhydride or fluoroanhydride comprises trifluoroacetic acid anhydride, trifluorobutyric acid anhydride, or combinations thereof.

4. The composition of claim 1, further comprising a surface roughening agent.

5. An operational surface coated with the composition of claim 4, wherein the operational surface is porous, smooth, rough, pitted, foamed, grooved, cross-hatched, or striated, or has patterned physical features.

6. The composition of claim 1, wherein the trifluoromethyl group-containing agent is a terminal trifluoromethyl group-containing agent.

7. An operational surface coated with the composition of claim 1.

8. An operational surface coated with the composition of claim 1, wherein the operational surface is porous, rough, pitted, foamed, grooved, cross-hatched, or striated, or has patterned physical features.

9. The operational surface of claim 8, wherein the operational surface comprises features having dimensions smaller than about 100 microns.

10. An operational surface coated with a composition comprising a fluorinated reactant having from about 3 to about 20 carbon atoms and at least one trifluoromethyl group, or a reaction product thereof, said composition further comprising a second component, said second component comprising a hardenable material, said composition capable of forming a coating having an exposed coating surface area populated with at least about 15% by area trifluoromethyl groups and a surface energy of about 22 dynes/cm or lower at 20°

C. wherein the operational surface is grooved, cross-hatched, or striated, including physical features having dimensions smaller than about 100 microns.

11. The operational surface of claim 10, wherein said second component comprises a non-fluorinated hardenable resin.

12. The operational surface of claim 10, wherein said second component comprises a fluorinated hardenable resin.

13. The operational surface of claim 10, wherein said second component comprises a perfluorinated hardenable resin.

14. The operational surface of claim 10, wherein said composition further includes a surface roughening agent.

15. The operational surface of claim 10, wherein said composition further comprises a fluorinated solvent.

16. The operational surface of claim 10, wherein the fluorinated reactant is a perfluorinated reactant.