Siloxane release surfaces on glass

• US 4,301,197 A
• Filed: 12/03/1979
• Issued: 11/17/1981
• Est. Priority Date: 12/03/1979
• Status: Expired due to Term

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Franz, Helmut, Shick, Lloyd G., Hanlon, James H.
• Primary Examiner(s): Lusignan, Michael R.
• Application Number:
  US06/099,775
• Time in Patent Office: 715 Days
• Field of Search: 528/31, 156/99, 156/247, 156/329, 428/447, 428/451, 428/412, 428/425.5, 428/429, 427/353, 427/354, 427/355
• US Class Current: 427/353
• CPC Class Codes: C03C 17/30 with silicon-containing compounds
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

Highly efficient release surfaces on glass substrates prepared by treatment of the glass with poly alkyl hydrogen siloxane are disclosed.

Claims

1. In a method of fabricating plastic material wherein the plastic contacts a surface of a rigid glass substrate from which the plastic must be released, the improvement which comprises treating the glass surface with a composition consisting essentially of a poly alkyl hydrogen siloxane to form a durable surface which releases said plastic.

2. The method according to claim 1, wherein the poly alkyl hydrogen siloxane is in solution in acidified alcohol.

3. The method according to claim 2, wherein the poly alkyl hydrogen siloxane is in solution in isopropanol which contains sulfuric acid.

4. The method according to claim 2, wherein the glass surface is treated with the poly alkyl hydrogen siloxane by wiping the glass surface with the solution and rinsing off the excess with water.

5. The method according to claim 4, wherein the poly alkyl hydrogen siloxane contains alkyl radicals selected from the group consisting of methyl, isopropyl and tertiary butyl.

6. The method according to claim 1, wherein the fabricating comprises a technique selected from the group consisting of press polishing, laminating, casting, reaction forming and stretching.

7. The method according to claim 1, wherein the plastic material is selected from the group consisting of acrylics, polycarbonates, polyvinyl acetals and polyurethanes.