Edward Powers

US Patent:

49279092, May 22, 1990

Filed:

Sep 18, 1987

Appl. No.:

7/098440

Inventors:

Lachhman Wadhwa - North Plainfield NJ
Michel Bitritto - Summit NJ
Edward J. Powers - Charlotte NC

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 7318
B29C 3914
B29C 6722

US Classification:

528331

Abstract:

The instant invention involves a process for producing continuous polybenzimidazole films. The process is comprised of the following steps: (a) preparing a solvent solution of a polybenzimidazole polymer; (b) continuously casting the solution upon a support; (c) evaporating a sufficient amount of the solvent to form a self-supporting film in an oven; (d) washing the film in a nonsolvent; (e) removing the film from the support; and (f) continuously collecting the continuous film.

US Patent:

42242940, Sep 23, 1980

Filed:

Jan 15, 1979

Appl. No.:

6/003323

Inventors:

Edward J. Powers - Harrison NY

Assignee:

Stauffer Chemical Company - Westport CT

International Classification:

C01B 2530

US Classification:

423309

Abstract:

A mixture of disodium and monosodium orthophosphate in a 2:1 mole ratio is prepared by sequentially reacting phosphoric acid with monohydrate process soda ash and caustic soda in a semi-solid reaction medium. Milled monohydrate process soda ash is contacted in less than stoichiometric proportions with phosphoric acid and the resultant orthophosphate containing reaction mixture is brought to a sodium to phosphorus mole ratio of about 1. 67:1 by subsequent reaction with caustic soda. The final reaction product of mixed disodium and monosodium orthophosphate is suitable feedstock for conversion to sodium tripolyphosphate.

US Patent:

50176811, May 21, 1991

Filed:

Feb 8, 1990

Appl. No.:

7/478163

Inventors:

Lachman Wadhwa - North Plainfield NJ
Michel Bitritto - Summit NJ
Edward J. Powers - Charlotte NC

Assignee:

Hoechst Celanese Corp. - Somerville NJ

International Classification:

C08G 7318

US Classification:

528342

Abstract:

The instant invention involves a process for producing continuous polybenzimidazole films. The process is comprised of the following steps: (a) preparing a solvent solution of a polybenzimidazole polymer; (b) continuously casting the solution upon a support; (c) evaporating a sufficient amount of the solvent to form a self-supporting film in an oven; (d) washing the film in a nonsolvent; (e) removing the film from the support; and (f) continuously collecting the continuous film.

US Patent:

40481395, Sep 13, 1977

Filed:

Feb 11, 1975

Appl. No.:

5/549040

Inventors:

Gordon W. Calundann - North Plainfield NJ
Edward J. Powers - Gillette NJ

Assignee:

Celanese Corporation - New York NY

International Classification:

C08K 322
C08K 330
C08K 534
C08K 536

US Classification:

260 458N

Abstract:

A route is provided for the formation of a polybenzimidazole solid material having an enhanced resistance to undergo the usual color darkening upon exposure to light. A minor concentration of a finely divided pigment found capable of stabilizing the background color inherently manifest by the polybenzimidazole polymer is dispersed in a solution of the polybenzimidazole, and the solvent is removed to produce a polybenzimidazole solid having the pigment substantially uniformly distributed therein. The pigment utilized may be arsenic thioarsenate, copper phthalocyanine, anatase titanium dioxide, or mixtures thereof. Fibers, films, three-dimensional shaped articles, etc. may be formed from the color stabilized polybenzimidazole.