Rohitkumar B Vora from 2650 Ocean Pkwy APT 1J, Brooklyn, NY 11235, age 80

Professional Records

Medicine Doctors

Dr. Rohitkumar Vora, Brooklyn NY - MD (Doctor of Medicine)

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Specialties:

Addiction Psychiatry

Address:

2601 Ocean Pkwy, Brooklyn, NY 11235
(718) 616-4331 (Phone), (718) 616-4105 (Fax)

Certifications:

Addiction Psychiatry, 2008
Psychiatry, 1997

Awards:

Healthgrades Honor Roll

Languages:

English

Hospitals:

2601 Ocean Pkwy, Brooklyn, NY 11235

Coney Island Hospital
2601 Ocean Parkway, Brooklyn, NY 11235

Education:

Medical School
Gujarat University / Byramjee Jeejeebhoy Medical College
Medical School
Brookdale University Hospital Med Center
Medical School
Montefiore M C H&L Moses Division

Rohitkumar Balabhai Vora, Brooklyn NY

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Specialties:

Psychiatry
Addiction Psychiatry

Work:

Coney Island Hospital
2601 Ocean Pkwy, Brooklyn, NY 11235

Education:

Smt. N.H.L. Municipal Medical College (1969)

Publications

Us Patents

Crosslinkable Polyimides From Bis (Aminophenoxy) Benzonitriles

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US Patent:

51010054, Mar 31, 1992

Filed:

May 18, 1989

Appl. No.:

7/348633

Inventors:

Rohitkumar H. Vora - Westfield NJ
Dinesh N. Khanna - West Warwick RI
Wolfgang K. Appel - Kelkheim, DE

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6300
C08G 6926
C08G 6942

US Classification:

528183

Abstract:

The present invention provides cross-linkable polyimide polymers having at least one repeating unit of the sturcture of: ##STR1## wherein n is the number of repeating groups and A is a tetravalent aromatic organic radical wherein each pair of carbonyl groups are attached to adjacent carbons in the ring moiety A. It has been found that polyimides having the structure of formula I may be crosslinked at surprisingly low temperatures when heated from about 75 to about 110. degree. C. to form infusible and solvent resistant shapes, thereby rendering them useful in the preparation of films, laminates and composites where inertness to solvents is a prerequisite.

Polyamide-Imide Polymers Having Fluorine-Containing Linking Groups

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US Patent:

51208261, Jun 9, 1992

Filed:

Dec 21, 1990

Appl. No.:

7/631559

Inventors:

Rohitkumar H. Vora - Westfield NJ
Paul N. Chen - Gillette NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6926
C08G 6928
C08G 7314

US Classification:

528350

Abstract:

The present invention provides for a novel heat stable class of polyamide-imide polymers having excellent flow properties and hydrolytic stability which are prepared by forming the polycondensation product of one or more aromatic or aliphatic diamines and a comonomer comprising a tri- or hexafluoro-substituted tricarboxylic acid anhydride (or acid derivative thereof) having the structure: ##STR1## wherein R is CF. sub. 3 or a phenyl radical. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, good resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as good thermal properties, including resistance to thermooxidative degradation.

Polyamide-Imide Polymers Having Fluorine-Containing Linking Groups

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US Patent:

51091070, Apr 28, 1992

Filed:

Dec 21, 1990

Appl. No.:

7/631558

Inventors:

Rohitkumar H. Vora - Westfield NJ
Paul N. Chen - Gillette NJ

Assignee:

Hoecht Celanese Corp. - Somerville NJ

International Classification:

C08G 6926
C08G 6928

US Classification:

528350

Abstract:

The present invention provides for a novel heat stable class of polyamide-imide polymers having excellent flow properties and hydrolytic stability which are prepared by forming the polycondensation product of one or more aromatic or aliphatic diamines, one or more additional comonomers selected from the group consisting of a tetrafunctional aromatic dianhydride, an aromatic or aliphatic dicarboxylic acid (or acid derivative thereof) and mixtures thereof, and a comonomer comprising a tri- or hexafluoro-substituted tricarboxylic acid anhydride (or acid derivative thereof) having the structure: ##STR1## wherein Z is CF. sub. 3 or a phenyl radical. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, good resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as good thermal properties, including resistance to thermooxidative degradation.

Polyamide-Imide Polymers Having 12-F Fluorine-Containing Linking Groups

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US Patent:

49636472, Oct 16, 1990

Filed:

Feb 27, 1989

Appl. No.:

7/316254

Inventors:

Rohitkumar H. Vora - Westfield NJ
Paul N. Chen - Morris NJ
Jeffrey S. Devolve - Warwick RI

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6926
C08G 6928

US Classification:

528350

Abstract:

The present invention provides novel heat stable polyamide-imide polymers having excellent flow properties which render them more readily processible into fibers, films, sheets and other molded articles. The polymers are prepared by forming the polycondensation product of one or more aromatic diamines and one or more trifunctional acid anhydride monomers, wherein at least one of said diamine monomers is a 12F-Diamine or 12F-Oxydiamine containing at least two CF. sub. 3 ##STR1## R groups linking two aromatic moieties, wherein R is CF. sub. 3 or phenyl. In addition to improved flow properties, the polyamide-imide polymers of this invention also exhibit improved solubility properties in most organic solvents, improved resistance to attack by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degredation.

Polymers Containing Both Imidazole And Imidazolone Structural Units

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US Patent:

51208253, Jun 9, 1992

Filed:

Dec 21, 1990

Appl. No.:

7/631557

Inventors:

Rohitkumar H. Vora - Westfield NJ
Paul N. Chen - Gillette NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6926
C08G 802
C08G 6300
C08G 1200

US Classification:

528350

Abstract:

The present invention provides for hybrid polybenzimidazole and polybenzimidazolone polymers which are characterized as containing both imidazole and imidazolone structural units in the polymer chain. These polymers are characterized as containing at least one recurring monomer unit containing the structure of the formula: ##STR1## wherein Ar is a tetravalent aromatic moiety derived from an aromatic tetraamine and Ar. sub. 1 is a trivalent aromatic moiety derived from a trifunctional acid, an acid anhydride or amine-reactive derivatives thereof, said polymers further characterized by an inherent viscosity of at least about 0. 01 dl/g measured as a 0. 5% solution in N-methyl pyrrolidone at 25. degree. C. The polymers of this invention exhibit many of the advantageous properties of both polybenzimidazole and polybenzimidazolone polymers. They are characterized as being extremely resistant to chemical attack such as by solvents, acids and bases.

Miscible Blends Of Polyimide Polymers And Process For Forming The Same

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US Patent:

51108798, May 5, 1992

Filed:

Apr 24, 1990

Appl. No.:

7/513645

Inventors:

Rohitkumar H. Vora - Westfield NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08L 7908

US Classification:

525432

Abstract:

Novel polyimide blends are formed of polyimide polymers each having moieties derived from dianhydride and diamine comonomers. The blends of the present invention may be formed by selecting polyimide polymers having structurally identical dianhydride-derived moieties, but structurally different diamine-derived moieties. Preferred miscible blends are formed wherein one of polyimides in the blend is the polymer condensation product of a dianhydride selected from 2,2-bis(3,4-dicarboxyphenyl) hexafluoropropane dianhydride, 3,3',4,4'-diphenyl tetracarboxylic dianhydride, 3,3',4,4'-benzophenone tetracarboxylic dianhydride, bis(3,4-dicarboxyphenyl ether dianhydride, pyromellitic dianhydride, and mixtures thereof, and 2,2-bis(3-aminophenyl) hexafluoropropane, and another of the polyimides in the blend is the polymer condensation product of the same dianhydride and mixtures thereof noted above, and 2,2-bis(4-aminophenyl) hexafluoropropane.

Polymers Prepared From 4,4'-Bis(3,4-Dicarboxyphenyl) Hexafluoroisopropyl) Diphenyl Dianhydride

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US Patent:

50617842, Oct 29, 1991

Filed:

Aug 6, 1990

Appl. No.:

7/543232

Inventors:

Werner H. Mueller - Nucces City TX
Rohitkumar H. Vora - Union City NJ

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C08G 7310

US Classification:

528353

Abstract:

Polyimides and polyamide-acids having improved solubility and processing characteristics and high glass transition temperatures are provided, having incorporated into the polymeric chain the novel aromatic dianhydride compound 4,4'-bis[2-(3,4-dicarboxyphenyl) hexafluoroisopropyl] diphenyl dianhydride. The polyamide-acids and polyimides are prepared by reacting the 12F-Diphenyl DA with aromatic or aliphatic diamines. It has been found that the polyimides of this invention have improved solubility characteristics, good dielectric properties while at the same time exhibiting relatively high glass transition temperatures, and superior thermal and thermo-oxidative stability. The polymers may be processed into films, fibers or compression molded or fabricated into composites at moderate temperatures and pressures.

Novel Polybenzimidazolone Polymers Based Hexafluoro Aromatic Tetraamines

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US Patent:

50754190, Dec 24, 1991

Filed:

Apr 6, 1990

Appl. No.:

7/505742

Inventors:

Rohitkumar H. Vora - Westfield NJ
Joseph D. Menczel - West Paterson NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6942
C08G 6926
C08G 802
C08G 6300

US Classification:

528353

Abstract:

This invention discloses new polybenzimidazolone polymers produced by the reaction of a hexafluoro aromatic tetraamine with a dianhydride reactant. These hexafluoro polybenzimidazolone polymers based on an aromatic hexafluoro tetraamine show improved solubility, easy processability, low moisture uptake, high thermal stability, resistance to solvent and other improvements over conventional polybenzimidazolone polymers.

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