Process for bonding an improved metallic support member to glass surfaces

• US 4,170,688 A
• Filed: 07/06/1978
• Issued: 10/09/1979
• Est. Priority Date: 07/09/1977
• Status: Expired due to Term

• Current Assignee: Saint-Gobain Isover (Compagnie De Saint-Gobain)
• Original Assignee: Saint-Gobain Isover (Compagnie De Saint-Gobain)
• Inventors: Nuding, Werner, Roentgen, Paul, Simons, Hubert
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US05/922,344
• Time in Patent Office: 460 Days
• Field of Search: 428/433, 428/437, 428/432, 428/471, 428/469, 428/83, 428/192, 156/89, 156/327
• US Class Current: 428/433
• CPC Class Codes: B60R 1/04 mounted inside vehicle B60R1/025, B60R1/08 take precedence
• CPC Class Codes: C03C 27/048 consisting of an adhesive specially adapted for that purpose
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]

Abstract

The invention disclosed provides a new improved metallic support member and process for bonding the metallic support member to a glass surface by means of an intermediate vitreous coating.

Claims

1. A process for bonding a metal part to a glass surface, which comprises applying an intermediate vitreous enamel coating to the metal part, and securing the metal part to the glass surface by means of a thermoplastic adhesive disposed between the vitreous enamel coating and the glass surface, said metal part being a suppport member for attachment of a rear-view mirror assembly and said glass surface being the inner side of an automobile glass windshield.

2. The process according to claim 1 wherein the enamel coating is produced by ceramic coating which is fired at temperatures of 550°

to about 650°

C.

3. The process according to claim 1 wherein the thermoplastic adhesive is polyvinyl butyral containing 21% to 30% by weight plasticizer.

4. A metallic support member bonded to a glass surface by a thermoplastic adhesive characterized in that the metallic support member includes a vitreous coating disposed on the surface thereof facing the glass surface and in direct contact with said thermoplastic adhesive.

5. The metallic support member of claim 4 wherein the intermediate vitreous coating is an enamel surface.

6. In a glass windshield having a metallic supporting member bonded to the glass surface by a thermoplastic adhesive for attachment thereto of a rear-view mirror assembly, the improvement which comprises an intermediate vitreous coating disposed on the metal surface of the member which is adhesively bonded to the windshield.

7. The glass windshield of claim 6 wherein the vitreous coating is an enamel coating.