Paint for silver film protection

• US 7,674,528 B1
• Filed: 09/08/2005
• Issued: 03/09/2010
• Est. Priority Date: 08/01/2002
• Status: Expired due to Term

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: Spraylat Corporation (Nouryon BV)
• Inventors: DeNuccio, Ronald J.
• Primary Examiner(s): Zimmer; Marc S
• Assistant Examiner(s): FRANK, NOAH S
• Application Number:
  US11/221,671
• Time in Patent Office: 1,643 Days
• Field of Search: 524/394
• US Class Current: 428/413
• CPC Class Codes: B05D 2203/35 Glass
• CPC Class Codes: B05D 2350/65 metal layer
• CPC Class Codes: B05D 3/067 Curing or cross-linking the coating
• CPC Class Codes: B05D 5/06 to obtain multicolour or other optical effects B05D5/02 takes precedence
• CPC Class Codes: C03C 17/38 at least one coating being a coating of an organic material
• CPC Class Codes: C08K 5/098 Metal salts of carboxylic acids
• CPC Class Codes: C09D 5/00 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 Class Codes: C09D 7/63 organic
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31515 As intermediate layer
• CPC Class Codes: Y10T 428/31518 Next to glass or quartz

Abstract

A paint and method are divulged for protecting the silver film of mirrors. The paint in its preferred embodiment includes a metal carboxylate which will contribute metal ions, namely stannous octoate for the contribution of stannous(II) ions in an amount of 0.5% or greater by weight. Alternate methods of the invention utilize an additional coating over the paint, such as an acrylic, epoxy or blend thereof which is UV curable. In another form of the paint, copper octoate is utilized in a minimum amount of 0.5% by weight for contribution of copper(II) ions.

Claims

1. A protective paint applied to a copperless silver film, said copperless silver film deposited on a substrate, said protective paint to prevent delamination of the copperless silver film from the substrate, the protective paint comprising:

a first cross linkable resin, a second cross linkable resin, a modifying resin and a metal II ion contributor, said metal II ion contributor selected from the group comprising copper or stannous carboxylates, octoates, tallates, rosinates, laurates, oleates, octadecanoates, neodecanoates, linoleates, naphthenoates, versatates and hexanoates, said metal II ion contributor to prevent delamination in the silver film.

2. The paint of claim 1 wherein said metal II ion contributor comprises stannous octoate.

3. The paint of claim 2 wherein said stannous octoate comprises 0.5-3% by weight of said paint.

4. The paint of claim 3 wherein said stannous octoate comprises 1.5% by weight of said paint.

5. The paint of claim 1 wherein said metal II ion contributor comprises:

copper carboxylate.

6. The paint of claim 5 wherein said copper carboxylate comprises 0.5-12% by weight of said paint.

7. A protective paint applied to a copperless silver film deposited on a substrate to prevent delamination of the copperless silver film from the substrate, the protective paint comprising:

a) a first cross linkable resin, said first cross linkable resin selected from the group comprising alkyd, polyester, acrylic, epoxy and epoxy modified acrylic resins, b) a second cross linkable resin, said second cross linkable resin selected from the group comprising;

melamine-formaldehyde, urea-formaldehyde, isocyanates and amine resins, c) a modifying resin, said modifying resin selected from the group comprising epoxy and phenoxy resins, and d) a metal II ion contributor, said metal II ion contributor to prevent delamination of the silver film, said metal II ion contributor selected from the group comprising copper or stannous carboxylates, octoates, tallates, rosinates, laurates, oleates, octadecanoates, neodecanoates, linoleates, naphthenoates, versatates and hexanoates.

8. The paint of claim 7 wherein said metal II ion contributor comprises stannous octoate.

9. The paint of claim 7 wherein said metal II ion contributor comprises copper octoate.

10. The paint of claim 7 wherein said first and second cross linkable resins are heat curable.