Dong Ling Zhang

US Patent:

7820253, Oct 26, 2010

Filed:

Oct 4, 2007

Appl. No.:

11/867372

Inventors:

Frank Harris - Boca Raton FL, US
Limin Sun - Copley OH, US
Dong Zhang - Uniontown OH, US
Stephen Z. D. Cheng - Richfield OH, US

Assignee:

Akron Polymer Systems - Akron OH

International Classification:

G02F 1/13363

US Classification:

428 13, 4284735, 349120, 528353

Abstract:

A negative birefringence film prepared from a poly(aryletherimide) which is the reaction product of a dianhydride and a diamine, where the dianhydride is 4,4′-[4,4′-(p-phenyleneoxy)isopropylidene]bis(phthalic anhydride) (BisADA), bis(3,4-dicarboxyphenyl)ether dianhydride (ODPA), 4,4′-bis(3,4-dicarboxyphenoxy)biphenyl dianhydride (BPEDA), 1,4-bis(3,4-dicarboxyphenyloxy)phenyl dianhydride (BPQDA), 3,3′,4,4′-tetracarboxylicbiphenyl dianhydride (BPDA), or 2,2-bis(3,4-dicarboxyphenyl)-1,1,1,3,3,3-hexafluoropropane dianhydride (6FDA), alone or a mixture with one or more of:.

US Patent:

7989036, Aug 2, 2011

Filed:

Mar 29, 2007

Appl. No.:

11/731285

Inventors:

Frank W. Harris - Boca Raton FL, US
Dong Zhang - Uniontown OH, US
Xiaoliang Joe Zheng - Akron OH, US
Ted Calvin Germroth - Kingsport TN, US
Thauming Kuo - Kingsport TN, US
Jiaokai Alexander Jing - Uniontown OH, US
Brian Michael King - Jonesborough TN, US

Assignee:

Akron Polymer Systems - Akron OH

International Classification:

C09K 19/02
C08F 22/40
G02F 1/13363

US Classification:

428 11, 428 13, 349117, 526262

Abstract:

Optical compensation films (positive C-plate) with disk anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm

US Patent:

8377558, Feb 19, 2013

Filed:

Apr 6, 2011

Appl. No.:

13/066136

Inventors:

Frank W. Harris - Boca Raton FL, US
Dong Zhang - Uniontown OH, US
Xiaoliang Joe Zheng - Akron OH, US
Ted Calvin Germroth - Kingsport TN, US
Thauming Kuo - Kingsport TN, US
Jiaokai Alexander Jing - Uniontown OH, US
Brian Michael King - Jonesborough TN, US

Assignee:

Akron Polymer Systems - Akron OH

International Classification:

B32B 9/04
B32B 27/28
G02F 1/13363

US Classification:

4284111, 428500, 349117, 349118, 349120

Abstract:

Optical compensation films (positive C-plate) with disk anisotropic subunits (OASUs) that have high positive birefringence throughout the wavelength range 400 nm

US Patent:

20080241427, Oct 2, 2008

Filed:

Mar 29, 2007

Appl. No.:

11/731142

Inventors:

Frank W. Harris - Boca Raton FL, US
Jiaokai Alexander Jing - Uniontown OH, US
Ted Calvin Germroth - Kingsport TN, US
Xiaoliang Joe Zheng - Akron OH, US
Brian Michael King - Jonesborough TN, US
Dong Zhang - Uniontown OH, US
Thauming Kuo - Kingsport TN, US
Qifeng Zhou - Beijing, CN

International Classification:

C09K 19/00

US Classification:

428 13

Abstract:

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.

US Patent:

20100208180, Aug 19, 2010

Filed:

Jan 12, 2010

Appl. No.:

12/686269

Inventors:

Frank W. Harris - Boca Raton FL, US
Limin Sun - Copley OH, US
Dong Zhang - Uniontown OH, US
Zhikuan Lu - Hudson OH, US
John D. Harvey - Seville OH, US
Koji Kigawa - Rye NY, US

International Classification:

G02F 1/13363
G02B 5/30

US Classification:

349117, 359494

Abstract:

A non-stretched, negative birefringent copolyester film, which has been solution cast from toluene and/or MIBK and mixtures of these with other solvents on a substrate, and has a Δn of >0.02 and a DP between 0.90 and 1.10.

US Patent:

20220267539, Aug 25, 2022

Filed:

Jun 28, 2021

Appl. No.:

17/360733

Inventors:

- Akron OH, US
Frank W. Harris - Boca Raton FL, US
Jiaokai Jing - Uniontown OH, US
Haci B. Erdem - Akron OH, US
John D. Harvey - Seville OH, US
Dong Zhang - Uniontown OH, US

International Classification:

C08J 5/18
B32B 27/34
C08G 69/32
C09D 177/10
B32B 17/10
B32B 17/06
B29C 41/24
B29C 35/02
B29C 39/14

Abstract:

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.

US Patent:

20170298198, Oct 19, 2017

Filed:

Jun 28, 2017

Appl. No.:

15/636281

Inventors:

FRANK W. HARRIS - BOCA RATON FL, US
DONG ZHANG - UNIONTOWN OH, US
LIMIN SUN - COPLEY OH, US
JIAOKAI JING - UNIONTOWN OH, US
HIDEO UMEDA - KOBE-SHI, JP
JUN OKADA - KOBE-SHI, JP

Assignee:

SUMITOMO BAKELITE CO., LTD. - SHINAGAWA-KU
AKRON POLYMER SYSTEMS, INC. - AKRON OH

International Classification:

C08J 5/18
H01L 51/00
C08G 69/32
C08G 69/42

Abstract:

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. The polyamide solution comprises a solvent, an aromatic polyamide dissolved in the solvent, and a multifunctional epoxyde, where the aromatic polyamide comprises at least one functional group that reacts with an epoxy group, the aromatic polyamide comprises a first repeat unit of formula (I) and a second repeat unit of formula (II)

US Patent:

20170022336, Jan 26, 2017

Filed:

Oct 3, 2016

Appl. No.:

15/284024

Inventors:

- Akron OH, US
Frank W. Harris - Boca Raton FL, US
Jiaokai Jing - Uniontown OH, US
Haci B. Erdem - Akron OH, US
John D. Harvey - Seville OH, US
Dong Zhang - Uniontown OH, US

International Classification:

C08J 5/18
C08G 69/32
B32B 17/06
B29C 35/02
B29C 39/14
B32B 27/34

Abstract:

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.