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Non-iridescent film with polymeric particles in primer layer

a polyester film, non-iridescent technology, applied in the direction of synthetic resin layered products, instruments, transportation and packaging, etc., can solve the problems of excessive iridescence of film, adverse optical properties of biaxially oriented polyester film coated with acrylic materal, optical interference of light rays, etc., to reduce the iridescence of pet/primer/acrylic polymer composite, reduce the iridescence, and the effect of durable adhesion

Inactive Publication Date: 2013-04-11
TORAY PLASTICS AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]In one aspect this invention relates to a highly optically clear, composite film having a predominantly thermoplastic polyester base layer and a primer layer of a polyester and polyurethane blend composition. The base layer preferably has an A/B/C layered structure with a substantially particle-free core layer B of polyester and outer layers A and C of polyester containing non-polyester, organic and/or inorganic particles. The primer layer is preferably applied to the base layer from solution that is organic solvent-free and is crosslinked using a carbodiimide crosslinking agent. The primer layer and base layer composite can be laminated with a protective layer of primarily acrylic polymer, for ex

Problems solved by technology

Although, biaxially oriented polyester film and acrylic coating each are optically clear, the composite film of biaxially oriented polyester film coated with acrylic materal can have adverse optical properties.
For example, the film can exhibit excessive iridescence.
The difference between these refractive indices causes optical interference of light rays reflected from the surface between the acrylic layer and the polyester layer.
Iridescence on the acrylic material coated polyester film is very evident under spectral light of fluorescent lamps because such light has a sharp distribution of luminescence that interferes with the rippled spectral reflectance of the acrylic material coated polyester film.
Hazy film is not desirable for many op

Method used

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  • Non-iridescent film with polymeric particles in primer layer
  • Non-iridescent film with polymeric particles in primer layer
  • Non-iridescent film with polymeric particles in primer layer

Examples

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example 2

[0084]The procedure of Comparative Example 1 was repeated except that the liquid mixture composition for the primer layer consisted of 19.267 pph polyester primer dispersion, 0.04 pph of leveling surfactant, 0.081 pph of antifoam / leveling surfactant, 0.144 pph of aqueous silica particle dispersion, 2.615 pph of aqueous crosslinking agent dispersion and 0.329 pph aqueous polyurethane particle dispersion combined with 76.455 pph deionized water. The aqueous polyurethane dispersion was a 32 wt % solids dispersion of particles less than about 100 μm size of inversely synthesized aliphatic polyurethane (Neorez R1010, DSM NeoResins B.V., Waalwijk, Netherlands). The primer layer drying conditions were same as in Comparative Example 1. The dry primer layer basis weight was again about 0.10 g / m2 and dry primer layer thickness was about 0.1 μm. Composition of the dry primer layer was about 96.5 wt % crosslinked polyester and about 1.5 wt % of the inversely synthesized aliphatic polyurethane p...

examples 8-11

[0091]For Examples 8-10, the procedure of Ex. 2 was repeated substantially identically except that 0.40 pph of PMMA particles was charged into the liquid mixture composition for the primer layer in place of polyurethane. In Ex. 8 a mixture of 50 wt. % Techpolymer SSX-102 and 50 wt. % Techpolymer SSX-104 microspheres was dispersed in the primer layer coating composition. Both of these Techpolymer materiasl from Sekisui are solid microsphers. SSX-102 particles had a nominal diameter of 2 μm. Mean diameter was 2.51 μm, median diameter was 2.46 μm, standard deviation of diameter was 0.25 μm and 97.6% of the particles had diameter between 2.00 and 3.17 μm. SSX-104 particles had a nominal diameter of 4 μm. Mean diameter was 4.298μm, median diameter was 4.239 μm, standard deviation of diameter was 0.504 μm and 89.4% of the particles had diameter between 4.00 and 5.04 μm. For Ex. 9, the PMMA particles were Techpolymer SSX-103DXE and had a nominal diameter of 3 μm, however these were hollow ...

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Abstract

This invention relates to an optically clear film of predominantly thermoplastic polyester base layer and a carbodiimide-crosslinked, polyester and polymethylmethacrylate blend primer layer. The base layer preferably has a particle-free core layer and outer layers containing nonpolyester, organic and/or inorganic particles. The primer layer is preferably applied to the base layer from solution that is organic solvent-free. The primer layer and base layer composite can be laminated with a protective layer of primarily acrylic polymer to form a solar control film. Functional additives, such as UV light blockers, can be present in various layers of the solar control film. Polymethylmethacrylate in the primer, especially in combination with crosslinking by the carbodiimide, provides the acrylic coated polyester base solar control film with notably reduced iridescence. Adhesion between the acrylic layer applied from organic solvent solutions and the polyester layers is durable in moist and warm service conditions.

Description

FIELD OF THE INVENTION[0001]The invention relates to optically clear biaxially oriented polyester film with at least one primer layer, having excellent adhesive properties to acrylic coating material over the primer layer even under harsh conditions, such as a high moisture environment. The polyester film coated with an acrylic hard coat, has reduced iridescence due to dispersion of particles of certain polyurethane or polymethylmethacrylate within a primer layer between the polyester and the acrylic hard coat. The polyester film may have UV blocking and weatherable properties and may be preferably used for window film, display film, outside clear label, outside signage and photo voltaic applications.BACKGROUND OF THE INVENTION[0002]A commercially and technically important utility for biaxially oriented polyester films is to serve as a component of many articles such as food packaging, printing media, electrical insulation, optical and the other industrial uses. The thermal stabilit...

Claims

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Application Information

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IPC IPC(8): C09D133/12
CPCC09D133/12C08G18/797Y10T428/24975B32B7/02C08G18/0866C09D175/04B32B7/12B32B27/08B32B27/20B32B27/308B32B27/36B32B2255/10B32B2264/025B32B2264/0278B32B2264/0292B32B2264/102B32B2307/518B32B2307/702B32B2307/71G02B1/14B05D3/007C09D5/002C09D167/00
Inventor PAOLILLI, TRACYFITCH, JOHN
Owner TORAY PLASTICS AMERICA
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