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High strength multilayer laminates comprising twisted nematic liquid crystals

A twisted nematic, liquid crystal technology, applied in the direction of liquid crystal materials, layered products, synthetic resin layered products, etc., can solve the problems of sacrificing visual transparency of windows and damaging windows.

Inactive Publication Date: 2008-05-21
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Removing energy from the visible region would sacrifice the window's visual transparency, thereby compromising one of the advantages of windows

Method used

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  • High strength multilayer laminates comprising twisted nematic liquid crystals
  • High strength multilayer laminates comprising twisted nematic liquid crystals
  • High strength multilayer laminates comprising twisted nematic liquid crystals

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment PE1

[0118] It will be composed of 48 parts by weight of the following composition structure and wherein R 1 is H and A is -((CH 2 ) 5 )-cholesteryl ester compounds,

[0119]

[0120] 48 parts by weight have the same composition structure as above and wherein R 1 is H and A is -((CH2 ) 2 )-O-cholesteryl ester compound, 3 parts by weight of trimethylolpropane triacrylate and 1 part by weight of Irgacure TM 651 photoinitiator (Ciba Specialty Chemicals, Basel, Switzerland), mixed together to form a colorless solution. The resulting solution was coated onto a friction and orientation layer treated clear annealed float glass substrate (6 inches x 12 inches x 2.5 mm thick) using doctor blade coating. The coating was cured by exposing the material to a 450 watt mercury vapor lamp for 30 seconds with the coated side facing the mercury lamp. A non-micelle-like twisted nematic liquid crystal layer on glass was obtained.

preparation Embodiment PE2

[0122] A colorless solution of PE1 was coated onto a rubbed biaxially oriented polyethylene terephthalate film substrate (6 inches by 12 inches by 4 mil (0.004 inch) thick) using knife coating. The coating was cured by exposing the material to a 450 watt mercury vapor lamp for 30 seconds with the coated side facing the mercury lamp. A non-micellar twisted nematic liquid crystal layer on a biaxially oriented polyethylene terephthalate film was obtained.

preparation Embodiment PE3

[0124] A colorless solution of PE1 was applied to a rubbed and flame treated biaxially oriented polyethylene terephthalate film substrate (6 in x 12 in x 4 mil (0.004 in) thick) using doctor blade coating superior. The coating was cured by exposing the material to a 450 watt mercury vapor lamp for 30 seconds with the coated side facing the mercury lamp. A non-micelle-like twisted nematic liquid crystal layer on a flame-treated biaxially oriented polyethylene terephthalate film was obtained.

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Abstract

Provided are multilayer laminates having one or more layers comprising twisted nematic liquid crystals and one or more layers of a polymeric sheet comprising a polymer with a modulus between 20,000 psi (138 MPa) and 100,000 psi (690 MPa). The twisted nematic liquid crystal layers reflect infrared radiation. Thus, the multilayer laminates are useful to reduce the transmission of infrared energy. For example, in some embodiments the multilayer laminates are useful as windows to reduce energy consumption necessary to cool the interior of a structure such as an automobile or building. Preferably, the multilayer laminates retain the beneficial properties of safety glass. The multilayer laminates may include additional layers such as infrared absorbing layers, half wave plates, and the like, to minimize the transmission of infrared energy. The multilayer laminates may also include further additional layers such as polymeric films, polymeric sheets, rigid sheets, and the like.

Description

Background of the invention [0001] Glass laminated products have contributed to society for nearly a century. Laminated glass is used as windows in trains, airplanes, ships, and virtually any other means of transportation, in addition to daily automotive safety glass, which is known for use in windshields. Safety glass is characterized by high impact and penetration resistance and does not scatter glass shards and debris when broken. [0002] Safety glass generally consists of a sandwich structure of two glass sheets or panels bonded together with an interlayer of polymer film or sheet between the two glass sheets. One or both of the glass sheets may be replaced by an optically clear rigid polymer sheet, such as a sheet of polycarbonate material. Safety glass has further evolved to include multiple layers of glass and polymer sheets bonded together with polymer film or sheet interlayers. [0003] The interlayer is usually a thicker polymer sheet that exhibits toughness and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B17/10G02B5/30C09K19/02C09K19/38
Inventor M·B·戈德芬格R·A·海斯L·A·西尔弗曼
Owner EI DU PONT DE NEMOURS & CO
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