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Acrylic polyvinyl acetal film for a light directing article

A polyvinyl acetal, light orientation technology, applied in optics, applications, optical components, etc., can solve problems such as reducing high temperature stability and difficult to print

Active Publication Date: 2019-02-05
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] EAA can be difficult to print and has reduced high-temperature stability due to its crystalline melting point
These characteristics can present challenges in the manufacture and use conditions of prismatic retroreflective articles

Method used

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  • Acrylic polyvinyl acetal film for a light directing article
  • Acrylic polyvinyl acetal film for a light directing article
  • Acrylic polyvinyl acetal film for a light directing article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] Primer 1 was coated onto a second sample of PET 1 at a thickness of 0.002 inches (51 microns) using a notch bar coater. The Primer 1 composition was exposed to a total UV-A energy of 3600 mJ / cm2 using multiple fluorescent lamps having a peak emission wavelength of 350 nm to obtain a non-pressure sensitive adhesive (PSA) acrylic on PET 1 membrane. Adhesive slurry 1 was coated onto PET 1 at a thickness of 0.002 inches (51 microns) using a notch bar coater. The irradiated non-PSA acrylic film / PET 1 composition was brought into intimate contact with the adhesive slurry 1 coated PET 1 using a two-roll coating station with a total gap setting of 0.008 inches (203 microns) and using a 350 Multiple fluorescent lamps with a peak emission wavelength in the nanometer were exposed to a total UV-A energy of 4263 mJ / cm2. A construction with PET 1 , PSA, non-PSA acrylic film and PET 1 in sequence was obtained. Next, the PET 1 liner was removed from Lot 9 from the DLX2 test to expos...

Embodiment 2

[0159] The components of Base 2 were added to a MAX 100 white speed mixer (available from FleckTek, Inc., Landrum, SC) and mixed at 3500 RPM for 5 minutes. Primer 2 was coated between untreated PET liners at a thickness of 2.0 mils and exposed to UVA light. Total Energy Use Powermap equipped with low-intensity sensing head TM Radiometer (purchased from EIT Company (EIT Inc., Sterling, VA) of Sterling, Virginia) to measure and is 1824mJ / cm 2 .

[0160] A plurality of optically active elements, specifically microreplicated cube corner structures, are provided on the layer as generally described in U.S. 5,691,846, the disclosure of which is incorporated herein by reference in its entirety. The cube corner structure (before dividing the structure into individual cubes) has 3 sets of intersecting grooves with a pitch of 0.004 inches (i.e., the main groove spacing) and a 58 / 58 / 64 degree base triangular hole, allowing the cube corner The height of the corner elements is 50.0 micro...

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Abstract

A light directing article comprises an acrylic polyvinyl acetal film to protect the optical elements of the light directing article. The acrylic polyvinyl acetal film has a Tg of at least 30 DEG C andcomprises a (meth)acrylic polymer and polyvinyl acetal polymer. The acrylic polyvinyl acetal film is flexible and durable to mechanical deformation.

Description

technical field [0001] This disclosure relates to acrylic polyvinyl acetal films for use in photoalignment articles. Background technique [0002] Light directing articles are capable of modulating incident light. Light directing films and sheets typically include optically active moieties that may be microstructured prisms or beads. [0003] A light directing article can allow a portion of light to pass through a substrate in a controlled manner, such as a light directing window film. In these types of light directing articles, the optically active moieties are typically microstructured prisms. [0004] Light directing articles redirect incident light toward its original source and are known as retroreflective articles. The ability to retroreflect light has led to the widespread use of retroreflective sheeting in a variety of articles. For retroreflective articles, the optically active portions are typically beads or microstructured prisms in cube corners. Beaded sheet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/12G02B1/14
CPCG02B5/12G02B1/14B32B7/022B32B7/023B32B3/28B32B5/16B32B7/12B32B27/14B32B27/20B32B27/30B32B27/308B32B2270/00B32B2307/51B32B2307/416B32B2307/418B29D11/00615B29K2031/04B29K2667/003C08L29/14C08L33/064G02B5/124G02B5/128B32B27/306B32B27/08
Inventor 托德·D·琼斯比马尔·V·塔卡尔杜安·D·范斯勒安东尼·F·舒尔茨乔纳森·E·亚诺斯基戴维·C·吕内堡卡拉·S·托马斯蒂安·Y·H·怀廷罗伯特·F·瓦特金斯
Owner 3M INNOVATIVE PROPERTIES CO
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