Hoechst Celanese Corporation

William R Lee

James R Hazen

Dinesh N Khanna

Varadaraj Elango

Cheryl A Littau

Jeffrey S Hurley

A process for preparing bis alkylene glycol esters of an alkali metal salt of 5-sulfoisophthalic acid. The subject compound is useful in preparing modified polyesters which can be dyed with basic or cationic dyes. The process is economical and low cost since intermediate reaction products are not purified.

Process for glycol esters of an alkali metal salt of 5-sulfoisophthalic

Nitro dinitro and diamino compounds having the formula: ##STR1## wherein A is selected from the group consisting of SO.sub.2 ; O, S, CO, C.sub.1 to C.sub.6 alkylene, perfluoroalkylene or perfluoroarylalkylene having from 1 to 10 carbon atoms, and a carbon-carbon bond directly linking the two aromatic groups, R is selected from the group consisting of hydrogen, hydroxy and C.sub.1 to C.sub.4 alkoxy, and R' is selected from the group consisting of NO.sub.2 and NH.sub.2. In the most preferred embodiment, the A linking group is selected from hexafluoroisopropylidene or 1-phenyl-2,- 2,2-trifluoroethane, and R is hydroxy. The compounds of the present invention, where R' is NH.sub.2, may be used as crosslinking agents for epoxy resins and for unsaturated elastomers, or as a reactant monomer with an organic diacid or dianhydride co-reactant monomer in the preparation of polyamide, polyimide, polyamide-imide and polybenzoxazole polymers having superior thermal and mechanical properties.

Bis-N,N' nitro or amino benzoyl amino phenols

This invention is an improved process for preparing 2,2-bis(4-aminophenyl)hexafluoropropane which comprises subjecting 2,2-bis(4-aminocarbonylphenyl)hexafluoropropane to the Hofmann reaction and then treating that reaction product under reducing conditions to produce the desired amine in high yield.

Process for bis(4-aminophenyl)hexafluoropropane

The invention is directed toward compounds having the formula: ##STR1## wherein A is a substituent independently selected from the group consisting of lower alkyl having from 1 to 3 carbon atoms, chloro or fluoro; n is an integer independently selected from 0 to 2; and X is a halogen selected from the group consisting of chloro and fluoro. Compounds of this invention are useful as intermediates in the preparation of the corresponding diamine compounds resulting from the reductive cleavage of the azo linkage. They may also be used to prepare dyestuffs and photosensitive materials.

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East Providence, RI, United States of America

William R Lee