Coated plastic film and plastic laminate prepared therefrom

• US 4,855,186 A
• Filed: 02/23/1988
• Issued: 08/08/1989
• Est. Priority Date: 03/06/1987
• Status: Expired due to Term

• Current Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Grolig, Gerhard, Schmidt, Guenther
• Primary Examiner(s): Herbert, Thomas J.
• Application Number:
  US07/159,618
• Time in Patent Office: 532 Days
• Field of Search: 428/463, 428/461, 428/698, 428/458, 428/216, 428/480, 428/332, 428/337, 427/160
• US Class Current: 428/216
• 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 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/266 of base or substrate
• 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.]
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

A coated plastic film 5 possessing high transmittance for visible light and high reflectance for heat radiation is disclosed which comprises a carrier film 1 of a transparent polymer and a reflection metal layer 3 embedded between two dielectric layers 2 and 4. The reflection metal layer 3 is formed from a metal selected from the group comprising silver, gold, and copper, whereas dielectric layers 2 and 4 are metal nitride layers.

This coated plastic film may be coated on each side with a polyvinyl butyral film to form a plastic laminate which is itself a constituent of a laminated safety glass pane.

Claims

1. A coated plastic film possessing a high transmittance for visible light and high reflectance for infrared radiation comprising a transparent plastic carrier film having a transparent heat reflection layer on at least one surface, said transparent heat reflection layer consisting of:

(a) a first dielectric layer adherent to the surface of said carrier film, said first dielectric layer comprising a nitride;

(b) a heat reflection metallic layer adherent to said first dielectric layer; and

(c) a second dielectric layer adherent to said heat reflection metallic layer, said second dielectric layer comprising a nitride;

said first and second dielectric layers are selected from the group consisting of aluminum nitride and silicon nitride.

2. The coated film of claim 1 possessing a transparency of at least 73% for a wavelength of 550 nm and a reflectance of at least 80% for a wavelength of 2,500 nm.

3. The coated film of claim 1 wherein said dielectric layers and said heat reflection metallic layer are each applied successively to said carrier film by cathodic sputtering.

4. The coated plastic film of claim 1 wherein said heat reflection metallic layer comprises a metal selected from the group consisting of silver, gold, and copper.

5. The coated plastic film of claim 4 wherein said heat reflection metal layer has a thickness in the range of from 5 to 40 nm and the thickness of each of said dielectric layers is in the range of from 20 to 60 nm.

6. The coated film of claim 1 wherein said carrier film comprises a polyethylene terephthalate film having a thickness of from 5 to 250 μ

m.

7. The coated film of claim 6 wherein the thickness of said polyethylene terephthalate film is in the range of from 5 to 50 μ

m.

8. A plastic laminate possessing a high transmittance for visible light and high reflectance for infrared radiation comprising two layers of polyvinyl butyral separated by a transparent plastic carrier film having a transparent heat reflection layer on at least one surface, said transparent heat reflection layer consisting of

(a) a first dielectric layer adherent to the surface of said carrier film, said first dielectric layer comprising a metal nitride;

(b) a heat reflection metallic layer adherent to said first dielectric layer; and

(c) a second dielectric layer adherent to said heat reflection metallic layer, said second dielectric layer comprising a metal nitride.

9. The plastic laminate of claim 8 wherein the individual thickness of each polyvinyl butyral film is in the range of from 0.2 to 0.8 mm.

10. A laminated safety glass pane comprising two glass panes separated by the plastic laminate of claim 8.