Polyarylene ethers containing xanthone units, a process for their preparation, and their use
AssigneeHoechst Aktiengesellschaft
InventorsPeter Wilharm, Thomas Weller, Michael Meier
Life of this patent
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Abstract
Polyarylene ethers that contain xanthone units and have a very high heat resistance can be prepared from inexpensive, readily accessible monomers by polycondensation in a basic medium under essentially anhydrous conditions in the presence or absence of an aromatic solvent at temperatures of from 150.degree. to 400.degree. C. Xanthone monomers and also hydroxyhalogen-substituted benzophenone compounds may be used as starting materials.
Claims18
A process for preparing a polymer or copolymer having recurring units of the formula ##STR11## or both, where R and R', which are the same or different, are hydrogen, alkyl, alkoxy, aryl, aryloxy groups or benzofused radicals,
- Ar is a divalent aromatic radical,
- X is a direct bond, --O-- or --S--, and
- n is zero or one, comprising:
- nucleophilically polycondensing at a temperature from 200.degree. to 400.degree. C., under essentially anhydrous conditions in the presence or absence of a polar, aprotic aromatic solvent, at least one hydroxyhalogen-substituted xanthone of the formula IIa or IIb ##STR12## where R, R', Ar, X and n are as defined above, and
- Hal is selected from the group consisting of fluorine and chlorine.
The process as claimed in claim 12, wherein L is a chlorine or fluorine group.
A process for preparing a polymer or copolymer having recurring units of the formula ##STR14## or both, where R and R', which are the same or different, are hydrogen, alkyl, alkoxy, aryl, aryloxy groups or benzofused radicals,
- Ar is a divalent aromatic radical,
- X is a direct bond, --O-- or --S--, and
- n is zero or one, consisting essentially of:
- nucleophilically polycondensing at a temperature from 200.degree. to 400.degree. C., under essentially anhydrous conditions in the presence or absence of a polar, aprotic aromatic solvent, at least one hydroxyhalogen-substituted xanthone of the formula IIa or IIb ##STR15## where R, R', Ar, X and n are as defined above, and
- Hal is selected from the group consisting of fluorine and chlorine.
Dependencies are inferred from the claim text.