Infrared reflecting laminated glass for automobile

• US 4,368,945 A
• Filed: 08/06/1980
• Issued: 01/18/1983
• Est. Priority Date: 08/28/1979
• Status: Expired due to Term

• Current Assignee: Asahi Glass Company Limited No 1-2 Marunouchi 2-Chome Chiyoda-Ku Tokyo, Honda Motor Company
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.), Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Mizuhashi, Mamoru, Kumata, Masataka, Fujimori, Yoshitugu
• Primary Examiner(s): Arnold, Bruce Y.
• Application Number:
  US06/175,696
• Time in Patent Office: 895 Days
• Field of Search: 350/1.6, 350/1.7, 350/164, 350/166
• US Class Current: 359/360
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• 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 2307/416 Reflective
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2605/006 Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters

Abstract

An infrared reflecting laminated glass having more than 70% transmission of visible rays comprising a pair of glass sheets with flexible, laminated interlayer films is disclosed wherein the interlayer films comprise a pair of polyvinyl butyral interlayer films which hold an infrared reflecting plastic film. The infrared reflecting plastic film is formed by sequentially coating, on a plastic film, a tungsten oxide layer havig a thickness of 180A to 500A or 1400A to 1600A, a silver layer having a thickness of 80A to 150A, and a tungsten oxide layer having a thickness of 180A to 500A or 1400A to 1600A, wherein at least one of the polyvinyl butyral interlayer films incorporates an ultraviolet absorbent.

Claims

1. An infrared reflecting laminated glass having more than 70% transmission of visible rays comprising a pair of glass sheets with flexible laminated interlayer films wherein said laminated interlayer films comprise a pair of polyvinyl butyral interlayer films which hold an infrared reflecting plastic film, said infrared reflecting plastic film formed by sequentially coating, on a plastic film, a tungsten oxide layer having a thickness of 180 A to 500 A or 1400 A to 1600 A, a silver layer having a thickness of 80 A to 150 A and a tungsten oxide layer having a thickness of 180 A to 500 A or 1400 A to 1600 A wherein at least one of said polyvinyl butyral interlayer films incorporate an ultraviolet absorbent.

2. The infrared reflecting laminated glass according to claim 1 wherein said infrared reflecting laminated glass has less than 12% reflectivity of visible rays.

3. The infrared reflecting laminated glass according to claim 1 wherein said infrared reflecting laminated glass has less than 65% transmission of solar rays.

4. The infrared reflecting laminated glass according to claim 1 wherein said infrared reflecting laminated glass has less than 12% of visible ray reflectivity and less than 65% of solar ray transmission.

5. The infrared reflecting laminated glass according to claim 1 wherein said polyvinyl butyral interlayer films absorb more than 90% of the ultraviolet rays having wavelengths of less than 3900 A.

6. The infrared reflecting laminated glass according to claim 1 wherein at least one of said polyvinyl butyral interlayer films incorporates said ultraviolet absorbent at a weight mixture ratio of 0.5 to 3% of said film weight.