Granted Patent B2

US 12,338,222 · App. 17/417,241 · Granted Jun 24, 2025

Inventors: James Patrick Schulte, II (Mt. Vernon, IN); Dadasaheb V. Patil (Mt. Vernon, IN); Juan Justino Rodriguez Ordonez (Cartagena, ES)

Assignee: SHPP GLOBAL TECHNOLOGIES B.V.

C07D307/89C08G73/1007C08G73/1046C08G73/1071

Abstract

Claims (26)

1. A method of making a biphenol dianhydride composition, the method comprising:

heating a first solution comprising

a biphenol tetraacid of the formula

wherein R a and R b are each independently a halogen or a monovalent Ci- 6 alkyl group and p and q are each independently an integer of 0 to 4;

at least one ionic species comprising sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, titanium ions, phosphorus ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, nitrite ions, and sulfite ions; and

a non-halogenated solvent comprising ethyl benzoate, diphenyl ether, phenetole, triglyme, benzonitrile, sulfolane, m-cresol, o-cresol, p-cresol, 1-nitrotoluene, 2-nitrotoluene, 3-nitrotoluene, 4-nitrotoluene,/V-methyl-pyrrolidinone, 1,3-dimethyl-2-imidazolidinone, dimethyl acetamide, or a combination thereof;

under conditions effective to provide a second solution comprising a corresponding biphenol dianhydride, the at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, titanium ions, phosphorus ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions, and the solvent.

2. The method of claim 1 , further comprising

cooling the second solution to a temperature effective to precipitate the biphenol dianhydride;

isolating the biphenol dianhydride from the second solution; and optionally

washing the isolated biphenol dianhydride with an organic solvent, water, or a combination thereof.

3. The method of claim 2 , further comprising filtering the second solution prior to cooling the second solution to remove ionic species or filtering the second solution prior to polymerization to remove ionic species.

4. A method for the purification of a biphenol dianhydride, the method comprising:

removing an ionic species from a solution comprising a biphenol dianhydride and a non-halogenated solvent, the non-halogenated solvent comprising ethyl benzoate, diphenyl ether, phenetole, triglyme, benzonitrile, sulfolane, m-cresol, o-cresol, p-cresol, 1-nitrotoluene, 2-nitrotoluene, 3-nitrotoluene, 4-nitrotoluene, /V-methyl-pyrrolidinone, 1,3-dimethyl-2-imidazolidinone, dimethyl acetamide, or a combination thereof,

the method comprising

adsorbing the ionic species from the solution by an adsorbent comprising celite, diatomaceous earth, silica, alumina, or a combination thereof;

crystallizing the biphenol dianhydride from the solution;

filtering the solution to remove the ionic species; or

a combination thereof.

5. The method of claim 1 , wherein the biphenol dianhydride is an isomer mixture.

6. The method of claim 1 , wherein the biphenol dianhydride comprises

less than 25 ppm each of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, titanium ions, phosphorus ions, and iron ions;

less than 110 ppm total of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, titanium ions, phosphorus ions, and iron ions;

less than 20 ppm each of phosphate ions, sulfate ions, sulfite ions chloride ions, nitrate ions, and nitrite ions; and

less than 50 ppm total of phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions.

7. A biphenol dianhydride made by the method of claim 1 .

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (32)