Paul Hsuehchiang Chen

US Patent:

20070166344, Jul 19, 2007

Filed:

Jan 18, 2006

Appl. No.:

11/334049

Inventors:

Xin Qu - East Brunswick NJ, US
Rainer Gruening - Basking Ridge NJ, US
Karen Merritt - Hillsborough NJ, US
Paul Chen - Canandaigua NY, US
Vitaly Falevich - Parsippany NJ, US

International Classification:

A61K 31/787
A61F 2/02
C08G 63/91
C08L 75/00

US Classification:

424423000, 424405000, 424078300, 525127000, 525054200

Abstract:

Surface-active, non-leaching antimicrobial film forming compositions and methods for their application to preferably medical device surfaces are provided. The compositions form durable coatings with long-lasting antimicrobial efficacy without formation of a zone of inhibition. Optionally the films can be hydrophilic. Specific long-chain molecules of certain chemical reactivity are covalently bonded into a polymeric matrix. They maintain a long-term anti-microbial efficacy without being leached out into the aqueous environment. The polymeric matrix of the compositions contain functional groups, which covalently bond to an amine, thiol, carboxyl, aldehyde or hydroxyl active group of selected long chain quaternary ammonium compounds. Upon formation of a covalent bonding with the polymeric matrix the long chain compounds become immobilized but still maintain antimicrobial efficacy. They do not leach out over extended period of time into the aqueous environment and maintain an anti-microbial efficacy against microorganisms. The coating is useful to prevent bacterial colonization on a variety of surface including surfaces of medical devices.

US Patent:

48427403, Jun 27, 1989

Filed:

Aug 5, 1988

Appl. No.:

7/228624

Inventors:

Paul N. Chen - Gillette NJ
Vincent J. Provino - Clifton NJ

Assignee:

Hoechst Celanese Corporation - Somerville NJ

International Classification:

C08J 928

US Classification:

21050027

Abstract:

This invention discloses novel membranes comprised of a blend of polyarylate and polybenzimidazole polymers. A membrane prepared from the blend of polybenzimidazole and polyarylate polymers exhibits enhanced properties over membranes prepared solely from either a polyarylate or a polybenzimidazole polymer. The addition of the polyarylate to the polybenzimidazole membrane allows the composition to be more thermally processable and less susceptible to moisture. The presence of the polybenzimidazole renders the polyarylate less reactive to solvents and increases its thermal stability. In addition, it has been surprisingly found that membranes prepared from the polybenzimidazole polyarylate blends show high regeneration capacity while retaining good flux ranges. The membranes prepared by this process exhibit good separation characteristics and provide an improved membrane with enhanced qualities over prior art membranes.

US Patent:

49546112, Sep 4, 1990

Filed:

Feb 27, 1989

Appl. No.:

7/316342

Inventors:

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

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 6926
C08G 6928

US Classification:

528353

Abstract:

The present invention provides for shaped articles made from 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, one or more trifunctional acid anhydride monomers, and one or more tetrafunctional aromatic dianhydrides, at least one of said monomers containing the groups ##STR1## 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 attach by chlorinated solvents such as trichloroethylene as compared with polyimides, improved hydrophobic properties as well as excellent thermal properties including resistance to thermooxidative degradation.

US Patent:

49634348, Oct 16, 1990

Filed:

Aug 3, 1988

Appl. No.:

7/229040

Inventors:

Paul N. Chen - Gillette NJ
Paul J. Harget - West Milford NJ
Thomas J. Dolce - Stirling NJ

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

D02G 300
B32B 900
B32B 2706

US Classification:

428378

Abstract:

A composite comprising a polyarylate or an aromatic polybenzimidazole article and a coating on at least one surface of the article comprised of a blend of from about 5 to about 95 weight percent of a polyarylate and from about 95 to about 5 weight percent of an aromatic polybenzimidazole. A process for preparing the composites comprises dissolving in a mutual solvent from about 5 to about 95 weight percent of the aromatic polybenzimidazole to about 95 to about 5 weight percent of the polyarylate, based on the total weight of those polymers, heating a polyarylate or aromatic polybenzimidazole article to a surface temperature over 100. degree. C. , e. g. , from about 120. degree. C. , to about 180. degree. C. , and then coating the polyarylate or aromatic polybenzimidazole article with the solution and subsequently evaporating the solvent, thereby producing a dried coating of a blend of a polyarylate and an aromatic polybenzimidazole on at least one surface of the article. The composites, particularly in the form of films, fibers or fibrets, may be post-treated with heat or sulfuric acid in order to minimize their shrinkage when subsequently subjected to heat and in order to increase their resistance to solvents and acid.

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.

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.

US Patent:

53089090, May 3, 1994

Filed:

Feb 19, 1993

Appl. No.:

8/019960

Inventors:

Paul N. Chen - Gillette NJ
Victor C. Astone - Union NJ
William M. Cooper - Clinton NJ
O. Richard Hughes - Chatham Township NJ

Assignee:

Hoechst Celanese Corp - Somerville NJ

International Classification:

C08K 340

US Classification:

524494

Abstract:

A moldable hollow glass filled PBI composition. The composition may be prepared by making a well-mixed slurry of glass microspheres in a solution of PBI in a suitable solvent, and then spinning the slurry through a jet or die under pressure and into a water bath where the particles coagulate. The solvent dissolves in the water, allowing solvent-free PBI-glass composite particles to be isolated.

US Patent:

51735415, Dec 22, 1992

Filed:

Dec 5, 1990

Appl. No.:

7/622563

Inventors:

Paul N. Chen - Gillette NJ
Morton M. Glick - Summit NJ
Michael M. Jaffe - Maplewood NJ
Alex Forschirm - Parsippany NJ

Assignee:

Hoechst Celanese Corp. - Somerville DE

International Classification:

C08F26502
C08F26702

US Classification:

525301

Abstract:

A graft copolymer having a polyolefinic main chain with muconic acid groups pendant therefrom. The acid groups are bonded to the backbone of the polyolefin by free radical addition across a muconic acid double bond. Preferably, the copolymer is prepared via a reactive extrusion process. The copolymer's applications include use as a reactive compatibilizer for polymer blends. The preferred polyolefin is polypropylene.

Address:

14738 Delaware Ave, Flushing, NY 11355

VIN:

5J8TB18558A018918

Make:

ACURA

Model:

RDX

Year:

2008