Akron Polymer Systems, Inc.

Kuo, Thauming

Harris, Frank W.

Wang, Bin

Zheng, Xiaoliang

Germroth, Ted Calvin

Zhang, Dong

Mcwilliams, Douglas S.

Xiaoliang Joe Zheng

Frank Wayne Harris

Dong Zhang

Thauming Kuo

Ted Germroth

Jiaokai Jing

Brian Michael King

Bin Wang

Douglas Stephen McWilliams

Peiyao Wang

Liu Deng

Wentao Li

Alan Keith Phillips

Lang Hu

Qifeng Zhou

Zhikuan Lu

Robert Jacks Sharpe

Limin Sun

Eduardo Gallas Cervo

Doug McWilliams

Ted Calvin Germroth

Frank Harris

Douglas S Mcwilliams

Douglas Stephens Mcwilliams

Jiaokai Alexander Jing

A flexible substrate with a high optical transparency (&#x3e;80% from 400 to 750 nm) that is retained after exposure to 300&#xb0; C., near-zero birefringence (&#x3c;&#xb1;0.001), and a relatively low CTE (&#x3c;60 ppm/&#xb0; C.) is disclosed. The substrate may be manufactured as single layer, polyimide films and as a multi-layer laminate comprising a polyimide layer and a thin glass layer. The polyimides may include alicyclic dianhydrides and aromatic, cardo diamines. The films formed of the polyimides can serve as flexible substrates for optical displays and other applications that require their unique combination of properties.

Thermally stable, flexible substrates for electronic devices

Disclosed is a process for making nitrated styrenic fluoropolymers having various degrees of substitution. The nitrated styrenic fluoropolymer is capable of providing an exceptionally high birefringence ranging from 0.02 to 0.036. Further, the birefringence can be tuned by varying the degree of substitution (DS) of the nitro group on the styrenic ring to meet the need for optical compensation film applications. More particularly, the optical compensation films of the present invention are for use in an in-plane switching LCD (IPS-LCD) and OLED display.

Method for the preparation of nitrated styrenic fluoropolymers

Disclosed is a multilayer optical compensation film comprising a first layer comprising a positive C-plate material and a second layer comprising a polyimide, as well as polymer compositions and resins and solutions containing said polymer compositions. The optical compensation film has a reversed wavelength dispersion that is capable of providing an achromatic (or broadband) retardation compensation. The optical film can be used in optical devices such as liquid crystal displays (LCD) or organic light emitting diode (OLED) displays.

Multilayer optical compensation film having reversed wavelength dispersion

Disclosed is an optical compensation film made of a solution cast of a polymer blend comprising a nitrated styrenic fluoropolymer and a polyimide. The compensation film is a positive-C plate having reversed wavelength dispersion that is capable of providing an achromatic (or broadband) retardation compensation. The optical film of the invention can be used in an optical device such as liquid crystal display (LCD) or organic light emitting diode (OLED) display.

Optical compensation film having reversed wavelength dispersion

A polymer blend includes a combination of an acrylic polymer and a styrenic fluoropolymer. The polymer blend may be used to make polymer films having a single glass transition temperature, a polarizing plate, or a display device with enhanced optical properties.

Fluoropolymer-based polymer blends, polymer films, and polarizer protective films

An optical compensation film is disclosed herein, which is made by uniaxially or biaxially stretching of a multilayer film including a first polymer film having a refractive index profile satisfying the equations of (n+n)/2&#x2265;nand |n&#x2212;n|&#x3c;0.005 and a second polymer film having a refractive index profile satisfying the equations of (n+n)/2&#x3c;nand |n&#x2212;n|&#x3c;0.005, wherein nand nrepresent in-plane refractive indices and nthe thickness-direction refractive index of the films, and wherein said optical compensation film has a positive in-plane retardation that satisfies the relations of 0.7&#x3c;R/R&#x3c;1 and 1&#x3c;R/R&#x3c;1.25, wherein R, R, and Rare in-plane retardations at the light wavelengths of 450 nm, 550 nm, and 650 nm respectively.

Wide-view optical film having reversed wavelength dispersion

A multilayer optical retardation compensation film having at least one positive C-plate and at least one negative C-plate is used in an LCD device. The multilayer film may have a substantially flat wavelength dispersion curve, or the multilayer film combined with other layers in the LCD device may have a substantially flat wavelength dispersion curve. Polymer films for the positive C-plate may be identified according to their absorbance maxima at certain wavelength ranges.

Liquid crystal display having improved wavelength dispersion characteristics

An optical compensation film composition is disclosed herein wherein the optical compensation film is stretched to yield a negative A-plate having a refractive index profile of n&#x3c;n=n. or a biaxial polymer film having a refractive index profile of n&#x3c;n&#x3c;n, the film having been stretched from a film cast from a polymer solution comprising a solvent and a polymer having a moiety of wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, and wherein R is hydrogen or a substituent on the styrenic ring.

Optical compensation films based on fluoropolymers

A multilayer optical film includes a wave plate having a refractive index profile of n&#x3e;n&#x2267;nand a fluoropolymer film comprising a moiety of wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, wherein R is each independently a substituent on the styrenic ring, n is an integer from 0 to 5 representing the number of the substituents on the styrenic ring, and wherein nand nrepresent in-plane refractive indices and nthe thickness-direction refractive index of the wave plates; wherein said multilayer optical film has a positive in-plane retardation (R) and an out-of-plane retardation (R) that satisfies the equation of |R|&#x3c;R/2 throughout the wavelength range of 400 nm to 800 nm.

Wide-view multilayer optical films

Optical compensation films (positive C-plate) with mesogen anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm&#x3c;&#x3bb;&#x3c;800 nm are provided. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Such optical compensation films are suitable for use as a positive C-plate in LCDs, particularly IPS-LCDs.

Optical compensation films with mesogen groups for liquid crystal display

The present invention provides uniaxially stretched polymer films that have a refractive index profile suitable for use as negative A-plates or biaxial birefringent plates in a liquid crystal display (LCD) device. These wave plates can be used to compensate for the phase retardations existing in various modes of LCDs including TN (twisted nematic), VA (vertically aligned), IPS (in-plane switching), and OCB (optically compensated bend), and therefore improving the viewing quality of the displays.

Optical compensation films based on stretched polymer films

A method for casting a styrenic fluoropolymer film on a substrate includes preparing a polymer solution by dissolving the fluoropolymer in a solvent or solvent blend whose Hansen solubility parameters (HSPs. MPa) satisfy the following relations: |SP&#x2212;SP|&#x3c;5, |SP&#x2212;SP|&#x3c;4, |SP&#x2212;SP|&#x3c;7, and 2&#x3c;|SP&#x2212;SP|&#x3c;10 wherein SP, SP, SP, are the total Hansen solubility parameters of solvent/solvent blend, fluoropolymer, and substrate, respectively; SP, SP, and, SPare the hydrogen-bond Hansen solubility parameters of solvent/solvent blend, fluoropolymer, and substrate, respectively; wherein the fluoropolymer comprises a moiety of: wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, and wherein R is each independently a substituent on the styrenic ring, n is an integer from 0 to 5 representing the number of the substituents on the styrenic ring.

Optical films cast from styrenic fluoropolymer solutions

A method for the preparation of a fluoropolymer by means of emulsion polymerization of a reaction mixture in an aqueous medium is disclosed wherein the reaction mixture includes a fluoromonomer having the structure of 

Method for the preparation of styrenic fluoropolymers

An optical compensation film composition is disclosed herein having a polymer film and a substrate, wherein the polymer film has a positive birefringence greater than 0.005 throughout the wavelength range of 400 nm&#x3c;&#x3bb;&#x3c;800 nm, the film having been cast from a polymer solution comprising a solvent and a polymer having a moiety of wherein R, R, and Rare each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R, R, and Ris a fluorine atom, and wherein R is hydrogen or a substituent on the styrenic ring.

Growing community of inventors

Akron, OH, United States of America

Xiaoliang Joe Zheng