James R Mitrano

US Patent:

46030387, Jul 29, 1986

Filed:

Oct 5, 1984

Appl. No.:

6/658301

Inventors:

J. Robert Adams - Baton Rouge LA
James R. Mitrano - Baton Rouge LA
Matthew K. Juneau - Baton Rouge LA

Assignee:

Ethyl Corporation - Richmond VA

International Classification:

C01B 2510

US Classification:

423300

Abstract:

Cyclic phosphonitrilic chloride trimer suitable for polymerization to light colored, high molecular weight, linear polyphosphonitrilic chloride can be made by (1) reacting PCl. sub. 5 and NH. sub. 4 Cl in an inert solvent (e. g. monochlorobenzene) to form a solution of a low molecular weight linear and cyclophosphonitrilic chlorides, (2) evaporating solvent to form a concentrate, (3) adding water and cooling the mixture to precipitate cyclic trimer, (4) separation of the trimer precipitate and (5) distillation of the separated trimer.

US Patent:

46055398, Aug 12, 1986

Filed:

Nov 16, 1984

Appl. No.:

6/671942

Inventors:

J. Robert Adams - Baton Rouge LA
James R. Mitrano - Baton Rouge LA
Matthew K. Juneau - Baton Rouge LA

Assignee:

Ethyl Corporation - Richmond VA

International Classification:

C01B 2510

US Classification:

423300

Abstract:

Polymer-grade cyclic phosphonitrilic chloride trimer can be obtained from crude cyclic polyphosphonitrilic chlorides by forming a solution of the crude cyclics, water washing the solution, distilling solvent to form a hot concentrate, cooling to form a precipitate and distilling the precipitate to form polymer-grade trimer.