Multi-layer reflectors

• US 4,358,507 A
• Filed: 11/13/1979
• Issued: 11/09/1982
• Est. Priority Date: 11/13/1978
• Status: Expired due to Term

• Current Assignee: NHK Spring Company Limited, Yokohama KIKO Company Limited (NHK Spring Company Limited)
• Original Assignee: NHK Spring Company Limited, Yokohama KIKO Company Limited (NHK Spring Company Limited)
• Inventors: Imai, Hiroshi, Katayama, Shitomi, Nomura, Suguru, Senaha, Susumu, Akagami, Akira, Kyo, Suizo, Shimomura, Susumu, Ohno, Akiro
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/093,564
• Time in Patent Office: 1,092 Days
• Field of Search: 428/429, 428/446, 428/447, 428/428, 428/452, 428/450, 428/411, 428/469, 428/472, 428/432, 428/433, 428/434, 428/913, 428/426, 428/450, 428/412, 428/457, 428/427, 428/625 , 428/626, 350/320, 350/288, 350/292, 427/124, 427/125, 427/295, 427/330
• US Class Current: 428/429
• CPC Class Codes: F21V 7/24 characterised by the material
• CPC Class Codes: F21V 7/28 characterised by coatings
• CPC Class Codes: G02B 5/0866 incorporating one or more organic, e.g. polymeric layers
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/31507 Of polycarbonate
• CPC Class Codes: Y10T 428/31518 Next to glass or quartz
• CPC Class Codes: Y10T 428/31522 Next to metal
• CPC Class Codes: Y10T 428/31612 As silicone, silane or siloxane
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane
• 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 428/31688 Next to aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer

Abstract

A multi-layer coating reflector consisting of 3 or 4 layers of the present invention, which comprises a light reflective metallic vacuum-deposited layer disposed on a substrate which may, or may not, have a resin layer thereon and a light transmittable inorganic or light transmittable resin layer which may, or may not, be further disposed on the surface of that, use for one or both of the resin layers high aryl silicone resin in which the mole percentage of aryl/alkyl+aryl is 65-100%.

With the use of such high aryl silicone resin, when said resin is a protective layer, the reflector has excellent resistance to light, weathering, water, humidity, chemicals and bending and when it is on the substrate, the light reflective metal has excellent reflection properties and obtains bright reflected images, high precision light collection and distribution properties.

Claims

1. A multi-layer coated reflector, having three or four layers, comprising a substrate capable of withstanding a vacuum deposition operation and a vacuum-deposited light-reflective metal layer, said reflector also including

(1) a resin layer consisting essentially of a silicone resin interposed between said substrate and said metal layer,

(2) a layer overcoated on said metal layer selected from the group consisting of a resin layer consisting essentially of silicone resin and an inorganic compound layer amorphous after deposition, with the proviso that where said inorganic compound layer is present, said reflector also includes a resin layer consisting essentially of a silicone resin interposed between said substrate and said metal layer, or

(3) a resin layer interposed between said substrate and said metal layer and a resin layer overcoated on said metal layer, at least one of said resin layers being flex resistant and consisting essentially of a thermosett silicone resin, where in each of (1), (2) and (3), said silicone resin is a high aryl-content silicone resin containing an aryl radical/(aryl radical+alkyl radical) mole percent of 65% to 100% wherein said silicone resin is obtained by curing condensing and polymerizing a polyaralkylsiloxane represented by the formula:

##STR2## wherein R is a lower (carbon) alkyl radical;

Ar is an aryl radical;

Z represents a functional group which will condense to form a polymer and wherein in said polyaralkylsiloxane (1) the mole fraction of aryl radicals to the sum of the aryl and alkyl radicals is 0.65 to 1.00, the polymerizable functionality of 2 to 3 and the ratio of the number of carbon atoms to the number of silicone atoms is 4.25 to 16.

2. A multi-layer coated reflector of claim 1 wherein structure (1) is used.

3. A multi-layer coated reflector of claim 1 wherein structure (2) is used and the layer overcoated on said metal layer is the resin layer.

4. A multi-layer coated reflector of claim 1 wherein structure (2) is used, said resin layer is interposed between said substrate and said metal layer and said layer overcoated on said metal layer is an inorganic compound layer which is light-transmittable.

5. A multi-layer coated reflector of claim 1 wherein structure (3) is used, and wherein said layer overcoated on said metal layer is a resin layer consisting essentially of said silicone resin.

6. A multi-layer coated reflector of claim 1 wherein structure (3) is used, and wherein said resin layer interposed between said substrate and said metal layer consists essentially of said silicone resin and wherein the layer overcoated on said metal layer is a resin layer which is light-transmittable.

7. A multi-layer coated reflector of claim 1 wherein structure (3) is used, and wherein said resin layer interposed between said substrate and said metal layer consists essentially of said silicone resin and wherein said layer overcoated on said metal layer is a resin layer which is light-transmittable and consists essentially of said silicone resin.

8. The multi-layer coated reflector as set forth in claim 1 wherein R is methyl, ethyl or propyl;

Ar is phenyl, tolyl, or naphthyl; and

Z is a hydroxy group or an alkoxy group.

9. The multi-layer coated reflector as set forth in claim 8 wherein R is methyl, Ar is phenyl and Z is selected from the group consisting of a hydroxy group, an ethoxy group, a propoxy group, and a butyloxy group.