Prelaminate with a partial cut to protect a solar coating from corrosion

• US 5,320,893 A
• Filed: 12/31/1992
• Issued: 06/14/1994
• Est. Priority Date: 12/31/1992
• Status: Expired due to Term

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Monsanto Company (Bayer AG)
• Inventors: Floyd, Brett W.
• Primary Examiner(s): WATKINS III, WILLIAM P
• Application Number:
  US07/999,350
• Time in Patent Office: 530 Days
• Field of Search: 428/912.2, 428/913, 428/437, 428/432, 428/430, 428/910, 428/192, 428/138, 428/136, 428/220, 428/458, 428/34, 428/38, 428/337, 428/76, 428/77, 156/101, 156/107, 156/99
• US Class Current: 428/136
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10036 comprising two outer 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 17/10183 being not continuous, e.g. in edge regions
• CPC Class Codes: B32B 17/10293 Edge features, e.g. inserts or holes
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10981 Pre-treatment of the layers
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/736 Shrinkable
• 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 27/08 of synthetic resin
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/239 Complete cover or casing
• CPC Class Codes: Y10T 428/24314 Slit or elongated
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/266 : of base or substrate
• CPC Class Codes: Y10T 428/31616 : Next to polyester [e.g., alkyd]
• CPC Class Codes: Y10T 428/3163 : Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31681 : Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]

Abstract

A method of protecting a metal layer of a solar reflecting coating on a heat-shrinkable substrate, which are components of a prelaminate for a laminated window, from atmospheric corrosion. The prelaminate is cut partially through its thickness adjacent the edge and when the region of the cut is later exposed to elevated temperature, preferably during the laminating process forming the window, the substrate shrinks to create a channel into which flows plasticized polyvinyl butyral (PVB) to block the edge wall of the coating inward of the channel from the surrounding atmosphere.

Claims

1. A prelaminate for a laminated window comprising:

a planar solar control film comprising a transparent, heat-shrinkable thermoplastic substrate layer bearing a transparent coating for reflecting solar radiation which includes one or more metal layers susceptible to atmospheric corrosion;

first and second layers containing plasticized polyvinyl butyral respectively bonded to the layered coating and thermoplastic substrate layer;

said prelaminate containing a peripherally continuous partial cut adjacent its edge extending in the thickness direction at least through both the first layer containing plasticized polyvinyl butyryl and the coated substrate layer of the solar control film.

2. The prelaminate of claim 1 wherein the cut extends partially through the second layer containing plasticized polyvinyl butyral.

3. The prelaminate of claim 2 wherein the cut is about 0.125 to 0.250 inch inward of the edge of the prelaminate.

4. The prelaminate of claim 3 wherein the substrate layer is polyester.

5. The prelaminate of claim 4 wherein the substrate layer comprises polyethylene terephthalate.

6. A prelaminate of oriented polyethylene terephthalate coated with a layered stack including at least one metal layer, encapsulated on each side with a layer containing plasticized polyvinyl butyral, said prelaminate adjacent the edge being peripherally continuously cut partially through its thickness which at least includes the polyethylene terephthalate, the stack and a layer containing plasticized polyvinyl butyryl.