Claims
- 1. A process for the preparation of block copolymers selected from the following formulae
- (a) (AB)m, (b) ABA, (c) BAB,
- (d) and combinations thereof,
- wherein A is a poly(aryl ether), or a poly(aryl ether ketone) block; B is an aromatic polycarbonate, or a polyarylate the molecular weights of the blocks A and B individually being at least 500; m is an integer and is one or greater; which comprises the steps of:
- (a) adding a dihydroxy-terminated poly(aryl ether) or poly(aryl ether ketone) oligomer having an RV of less than 0.40 measured in chloroform at 25.degree. C. to a high molecular weight aromatic polycarbonate, or a high molecular weight polyarylate and adding diphenyl carbonate in approximately equal molar amounts to the dihydroxy terminated poly( aryl ether) or poly(arylether) ketone and reacting first at at least 230.degree. C. for up to 8 hours and then reacting under vacuum at at least 230.degree. C. for up to 8 hours until an RV of greater than 0.40 dl/g, as measured in chloroform at 25.degree. C., is achieved.
- 2. A process as defined in claim 1 wherein the aromatic polycarbonate is the polycarbonate of 2,2-bis(4-hydroxyphenyl)propane.
- 3. A process as defined in claim 1 wherein the polyarylate is a polyester derived from at least one dihydric phenol and at least one aromatic dicarboxylic acid.
- 4. A process as defined in claim 3 wherein the polyarylate is of the formula ##STR44## wherein the ratio of the aromatic acids is in the range of from about 85:15 to about 15:85.
- 5. A process as defined in claim 1 wherein the poly(aryl ether) block is of the formula
- --O--E--O--E'--
- wherein E is the residuum of a dihydric phenol, and E' is the residuum of a benzenoid compound having an inert electron withdrawing group in at least one of the positions ortho and para to the valence bonds; both of said residua being valently bonded to the ether oxygens through aromatic carbon atoms.
- 6. A process as defined in claim 5 wherein the residue E' is one or more of the following: ##STR45## wherein Ar.sub.4 is a divalent aromatic radical.
- 7. A process as defined in claim 5 wherein the poly(aryl ether) blocks contain repeating units of one or more of the following formulae ##STR46## wherein Ar.sub.5 is one or more of ##STR47##
- 8. A process as defined in claim 1 performed in solvent selected from the group consisting essentially of chlorinated aromatics, aromatic ethers, amides, sulfones, sulfoxides, aromatic ketones and aromatic nitro compounds; and wherein said solvents are used in amounts such that the solids levels are in the range of from about 20 to about 70 percent.
- 9. A process as defined in claims 1 or wherein the block copolymers are formed in a single or twin screw extruder, under a pressure below about 15 mm Hg.
- 10. A process for the preparation of block copolymers selected from the following formulae:
- (a) (AB)m, (b) ABA, (c) BAB,
- (d) and combinations thereof,
- wherein A is a poly(aryl ether), or a poly(aryl ether ketone) block:B is an aromatic polycarbonate, the molecular weights of the blocks A and B individually being at least 500; m is an integer and is one or greater; which comprises the steps of:
- (a) adding a dihydroxy-terminated poly(aryl ether) or poly(aryl ether ketone) oligomer having an RV of less than 0.40 measured in chloroform at 25.degree. C. to a high molecular weight aromatic polycarbonate, and adding a diaryl ester of carbonic or of a dicarboxylic acid in approximately equal molar amounts to the dihydroxy terminated polyaryl ether or polyarylether ketone and reacting first at at least 230.degree. C. for up to 8 hours and then reacting under vacuum at at least 230.degree. C. for up to 8 hours until an RV of greater than 0.40 dl/g, as measured in chloroform at 25.degree. C., is achieved.
- 11. A process as defined in claim 10 wherein the block copolymers are formed in a single or twin screw extruder under a pressure below about 15 mm Hg.
Parent Case Info
This is a continuation of application Ser. No. 332,880, filed Apr. 3, 1989 now U.S. Pat. No. 5,077,351.
US Referenced Citations (4)
Continuations (1)
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Number |
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332880 |
Apr 1989 |
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