Laminate for a safety glazing

• US 5,024,895 A
• Filed: 06/18/1990
• Issued: 06/18/1991
• Est. Priority Date: 06/18/1990
• Status: Expired due to Term

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Monsanto Company (Bayer AG)
• Inventors: Kavanagh, Dean L., Simon, Robert H. M.
• Primary Examiner(s): Cashion, Jr., Merrell C.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/539,252
• Time in Patent Office: 365 Days
• Field of Search: 428/437, 428/480, 428/426, 428/473.5, 428/423.1, 428/412, 428/500, 428/457, 428/458, 350/1.1, 350/1.6
• US Class Current: 428/437
• CPC Class Codes: B29C 51/10 Forming by pressure difference, e.g. vacuum
• CPC Class Codes: B29C 51/14 using multilayered preforms or sheets
• CPC Class Codes: B29K 2067/00 Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10009 characterized by the number, the constitution or treatment of glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10981 Pre-treatment of the layers
• CPC Class Codes: B32B 2307/734 Dimensional stability
• CPC Class Codes: B32B 2329/06 PVB, i.e. polyinylbutyral
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: B32B 37/144 using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding constructional features for tensioning B32B38/1825
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31551 Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31681 : Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31721 : Of polyimide
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]

Abstract

A flexible, draw-formed laminate for a safety glazing comprising a transparent, thermoplastic carrier film which is shrink-stable during laminating formation of such safety glazing bonded to at least one layer of plasticized polyvinyl butyral, such film having a greater tensile modulus than that of the layer of plasticized polyvinyl butyral. The carrier film is preferably flexible polyester such as polyethylene terephthalate having one or more functional performance coatings or layers on its surface such as a multi-layered solar radiation control stack.

Claims

1. A flexible, draw-formed laminate capable of conforming to a surface with compound curvature for use in a safety glazing comprising a transparent, thermoplastic carrier film which is shrink-stable during laminating formation of said safety glazing, bonded to at least one layer of plasticized polyvinyl butyral, said film having a greater tensile modulus than that of the layer of plasticized polyvinyl butyral.

2. The laminate of claim 1 wherein the thermoplastic of the film comprises polyester.

3. The laminate of claim 2 wherein the polyester is polyalkylene terephthalate.

4. The laminate of claim 3 wherein the polyalkylene is polyethylene.

5. The laminate of either of claims 1 or 4 wherein the film is sufficiently stress-relieved to avoid substantial wrinkling during elevated temperature laminating formation of the safety glazing.

6. The laminate of claim 5 wherein the thermoplastic film is interposed between and bonded to two layers of plasticized polyvinyl butyral.

7. The laminate of claim 6 wherein the bonded thermoplastic film has a carrier surface on which is deposited one or more metal layers and one or more cooperating adherent dielectric layers defining a solar radiation control stack.