Patents Assigned to AKRON POLYMER SYSTEMS, INC.
-
Patent number: 11084906Abstract: A class of solvent resistant, flexible copolyimide substrates having high optical transparency (>80% from 400 to 750 nm) that is retained after brief exposure to 300° C., near-zero birefringence (<0.001) and a maximum CTE of approximately 60 ppm/° C. is disclosed. The copolyimides are prepared from alicyclic dianhydrides, aromatic cardo diamines, and aromatic diamines containing free carboxyl groups. The substrates are manufactured from solutions of the copolyimides containing multifunctional epoxides in the form of single layer films, multilayer laminates and glass fiber reinforced composite films. The substrates can be used in the construction of flexible optical displays, and other microelectronic and photovoltaic devices that require their unique combination of properties.Type: GrantFiled: August 17, 2012Date of Patent: August 10, 2021Assignee: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Jiaokai Jing, Frank W. Harris
-
Patent number: 11059742Abstract: A flexible substrate with a high optical transparency (>80% from 400 to 750 nm) that is retained after exposure to 300° C., near-zero birefringence (<±0.001), and a relatively low CTE (<60 ppm/° 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.Type: GrantFiled: May 10, 2013Date of Patent: July 13, 2021Assignee: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Jiaokai Jing, Frank W. Harris, Zhikuan Lu, Xiaoliang Zheng
-
Publication number: 20200399469Abstract: Films with optical transmittance of >80% between 400 and 750 nm and with coefficient of thermal expansion less than 20 ppm/° C. are prepared from aromatic polyamides that are soluble in polar organic solvents yet have glass transition temperatures>300° C. The films are cross-linked in the solid state by heating at elevated temperatures for short periods of time in the presence of multifunctional epoxides. Surprisingly, the optical and thermal properties of the films do not change significantly during the curing process. The temperature required for the crosslinking process to take place can be reduced by the presence of a few free, pendant carboxyl groups along the polyamide backbones. The films are useful as flexible substrates for electronic displays and photovoltaic devices.Type: ApplicationFiled: August 31, 2020Publication date: December 24, 2020Applicant: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Frank W. Harris, Jiaokai Jing
-
Patent number: 10556973Abstract: 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.Type: GrantFiled: August 11, 2017Date of Patent: February 11, 2020Assignee: Akron Polymer Systems, Inc.Inventors: Lang Hu, Liu Deng, Wentao Li, Robert Sharpe, Eduardo Cervo, Thauming Kuo, Bin Wang, Alan Phillips, Xiaoliang Zheng, Peiyao Wang, Dong Zhang, Frank Harris, Ted Germroth
-
Patent number: 10125250Abstract: 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.Type: GrantFiled: August 11, 2017Date of Patent: November 13, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Xiaoliang Zheng, Alan Phillips, Bin Wang, Peiyao Wang, Lang Hu, Wentao Li, Liu Deng, Thauming Kuo, Dong Zhang, Frank Harris, Ted Germroth
-
Patent number: 10126479Abstract: 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.Type: GrantFiled: August 11, 2017Date of Patent: November 13, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Bin Wang, Peiyao Wang, Dong Zhang, Thauming Kuo, Alan Phillips, Lang Hu, Xiaoliang Zheng, Wentao Li, Liu Deng, Frank Harris, Ted Germroth
-
Patent number: 10088615Abstract: 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.Type: GrantFiled: January 22, 2016Date of Patent: October 2, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Xiaoliang Zheng, Frank W. Harris, Thauming Kuo, Bin Wang, Ted Germroth, Dong Zhang, Douglas S. McWilliams, Peiyao Wang
-
Patent number: 9963548Abstract: Solvent resistant, transparent films prepared from solutions of aromatic polyamides and multi-functional carboxylic acids in polar aprotic solvents are described herein. Solvent resistance is achieved by heating the films for a short time above 300° C. near the polyamide Tg. The films have CTEs less than 40 ppm/° C. and are optically clear displaying transmittance above 75% between 400 and 750 nm. The films are useful as substrates for flexible electronic devices.Type: GrantFiled: April 23, 2013Date of Patent: May 8, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Frank W. Harris, Jiaokai Jing
-
Patent number: 9939554Abstract: 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 (nx+ny)/2?nz and |nx?ny|<0.005 and a second polymer film having a refractive index profile satisfying the equations of (nx+ny)/2<nz and |nx?ny|<0.005, wherein nx and ny represent in-plane refractive indices and nz the 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<R450/R550<1 and 1<R650/R550<1.25, wherein R450, R550, and R650 are in-plane retardations at the light wavelengths of 450 nm, 550 nm, and 650 nm respectively.Type: GrantFiled: January 24, 2013Date of Patent: April 10, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Bin Wang, Thauming Kuo, Ted Germroth, Dong Zhang, Doug McWilliams, Frank Harris, Jiaokai Jing, Xiaoliang Zheng
-
Publication number: 20180094135Abstract: Films with optical transmittance of >80% between 400 and 750 nm and with coefficient of thermal expansion less than 20 ppm/° C. are prepared from aromatic polyamides that are soluble in polar organic solvents yet have glass transition temperatures >300° C. The films are cross-linked in the solid state by heating at elevated temperatures for short periods of time in the presence of multifunctional epoxides. Surprisingly, the optical and thermal properties of the films do not change significantly during the curing process. The temperature required for the crosslinking process to take place can be reduced by the presence of a few free, pendant carboxyl groups along the polyamide backbones. The films are useful as flexible substrates for electronic displays and photovoltaic devices.Type: ApplicationFiled: November 22, 2017Publication date: April 5, 2018Applicant: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Frank W. Harris, Jiaokai Jing
-
Publication number: 20180072882Abstract: 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.Type: ApplicationFiled: August 11, 2017Publication date: March 15, 2018Applicant: Akron Polymer Systems, Inc.Inventors: Xiaoliang Zheng, Alan Phillips, Bin Wang, Peiyao Wang, Lang Hu, Wentao Li, Liu Deng, Thauming Kuo, Dong Zhang, Frank Harris, Ted Germroth
-
Publication number: 20180052271Abstract: 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.Type: ApplicationFiled: August 11, 2017Publication date: February 22, 2018Applicant: Akron Polymer Systems, Inc.Inventors: Bin Wang, Peiyao Wang, Dong Zhang, Thauming Kuo, Alan Phillips, Lang Hu, Xiaoliang Zheng, Wentao Li, Liu Deng, Frank Harris, Ted Germroth
-
Publication number: 20180044444Abstract: Disclosed are optical compensation films with exceptionally high positive out-of-plane birefringence. The optical compensation films are based on substituted styrenic fluoropolymers and have positive out-of-plane bireftingence greater than 0.02 throughout the wavelength range of 400 nm<?<800 nm. The optical compensation films of the invention are suitable for use in optical devices such as liquid crystal display (LCD) devices and organic light emitting diode (OLED) display devices.Type: ApplicationFiled: August 11, 2017Publication date: February 15, 2018Applicant: Akron Polymer Systems, Inc.Inventors: Dong Zhang, Ted Germroth, Thauming Kuo, Xiaoliang Zheng, Chao Chen, Peiyao Wang, Lang Hu, Wentao Li, Alan Phillips, Frank Harris
-
Publication number: 20180044447Abstract: 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.Type: ApplicationFiled: August 11, 2017Publication date: February 15, 2018Applicant: Akron Polymer Systems, Inc.Inventors: Lang Hu, Liu Deng, Wentao Li, Robert Sharpe, Eduardo Cervo, Thauming Kuo, Bin Wang, Alan Phillips, Xiaoliang Zheng, Peiyao Wang, Dong Zhang, Frank Harris, Ted Germroth
-
Patent number: 9873763Abstract: The present disclosure, in one aspect, relates to a polyamide solution including an aromatic polyamide and a solvent, wherein the aromatic polyamide includes at least two types of constitutional units, and a change rate of coefficient of thermal expansion (CTE) of a cast film produced by casting the polyamide solution on a glass plate and CTE of the same cast film after being subjected to a heat treatment at temperature of 200° C. to 450° C. (=CTE after heat treatment/CTE before heat treatment) is 1.3 or less.Type: GrantFiled: October 1, 2014Date of Patent: January 23, 2018Assignees: AKRON POLYMER SYSTEMS, INC., SUMITOMO BAKELITE CO., LTD.Inventors: Limin Sun, Dong Zhang, Jiaokai Jing, Frank W. Harris, Hideo Umeda, Ritsuya Kawasaki, Toshihiko Katayama, Yusuke Inoue, Jun Okada, Mizuho Inoue, Manabu Naito
-
Patent number: 9856376Abstract: Films with optical transmittance of >80% between 400 and 750 nm and with coefficient of thermal expansion less than 20 ppm/° C. are prepared from aromatic polyamides that are soluble in polar organic solvents yet have glass transition temperatures >300° C. The films are crosslinked in the solid state by heating at elevated temperatures for short periods of time in the presence of multifunctional epoxides. Surprisingly, the optical and thermal properties of the films do not change significantly during the curing process. The temperature required for the crosslinking process to take place can be reduced by the presence of a few free, pendant carboxyl groups along the polyamide backbones. The films are useful as flexible substrates for electronic displays and photovoltaic devices.Type: GrantFiled: June 20, 2012Date of Patent: January 2, 2018Assignee: Akron Polymer Systems, Inc.Inventors: Limin Sun, Dong Zhang, Frank W. Harris, Jiaokai Jing
-
Publication number: 20170298198Abstract: A process for manufacturing a display device, an optical device or an illuminating device includes casting a polyamide solution onto a base at temperature below 200° C. to obtain a film, heating the film on the base at temperature sufficient to make the film solvent resistant and obtain a polyamide film, forming on a surface of the polyamide film one of a display element, an optical element and an illumination element to form a display device, an optical device or an illumination device, and de-bonding the base from the display device, the optical device or the illuminating device.Type: ApplicationFiled: June 28, 2017Publication date: October 19, 2017Applicants: SUMITOMO BAKELITE CO., LTD., AKRON POLYMER SYSTEMS, INC.Inventors: FRANK W. HARRIS, DONG ZHANG, LIMIN SUN, JIAOKAI JING, HIDEO UMEDA, JUN OKADA
-
Patent number: 9457496Abstract: The present invention is directed toward transparent films prepared from soluble aromatic copolyamides with glass transition temperatures greater than 300 C. The copolyamides, which contain pendant carboxylic groups are solution cast into films using N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidinone (NMP), or other polar solvents. The films are thermally cured at temperatures near the copolymer glass transition temperature. After curing, the polymer films display transmittances >80% from 400 to 750 nm, have coefficients of thermal expansion of less than 20 ppm, and are solvent resistant. The films are useful as flexible substrates for microelectronic devices.Type: GrantFiled: June 29, 2011Date of Patent: October 4, 2016Assignee: Akron Polymer Systems, Inc.Inventors: Limin Sun, Frank W. Harris, Jiaokai Jing, Haci B. Erdem, John D. Harvey, Dong Zhang
-
Publication number: 20160215132Abstract: 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.Type: ApplicationFiled: January 22, 2016Publication date: July 28, 2016Applicant: Akron Polymer Systems, Inc.Inventors: Xiaoliang Zheng, Frank W. Harris, Thauming Kuo, Bin Wang, Ted Germroth, Dong Zhang, Douglas S. McWilliams, Peiyao Wang
-
Publication number: 20160208096Abstract: In an aspect, the present disclosure relates to a polyamide solution comprising an aromatic polyamide and a solvent, wherein a Young's modulus of at least one direction of a cast film produced by casting the polyamide solution on a glass plate is 3.0 GPa or more, and a tensile strength of the cast film is 100 MPa or more and 250 MPa or less. In another aspect, the present disclosure relates to a polyamide solution comprising an aromatic polyamide and a solvent, wherein a Young's modulus of at least one direction of a cast film produced by casting the polyamide solution on a glass plate is 3.0 GPa or more, and an aromatic polyamide of the polyamide solution has a constitutional unit represented by following general formulae (I) and (II).Type: ApplicationFiled: January 15, 2016Publication date: July 21, 2016Applicants: AKRON POLYMER SYSTEMS, INC., SUMITOMO BAKELITE COMPANY LIMITEDInventors: Limin Sun, Dong Zhang, Jiaokai Jing, Frank W. Harris, Takehiko Maetani, Ritsuya Kawasaki, Toshihiko Katayama, Hideo Umeda