Color-stabilized aromatic carboxylic acid chlorides and a process for their preparation
AssigneeBayer Aktiengesellschaft
InventorsWalter Bockmann, Karl-August Lipper, Friedrich Bruhne
Life of this patent
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Abstract
A process for color stabilizing aromatic carboxylic acid chloride against discoloration which comprises introducing into a composition containing an aromatic carboxylic acid chloride 0.001 to 2% by weight of a color stabilizer, based upon the amount of said aromatic carboxylic acid chloride. The use of aldehydes, ketones, olefins, phosphorus and arsenic containing compounds are contemplated as stabilizer.
Claims15
A process for color stabilizing an aromatic carboxylic acid chloride of the formula ##STR5## wherein R.sub.1 and R.sub.2 independently represent hydrogen and halogen, alkyl or alkoxy which comprises introducing into a a composition containing said aromatic carboxylic acid chloride 0.001 to 2% by weight of a color stabilizer, based upon the amount of said carboxylic acid chloride, said color stabilizer being selected from the group consisting of
- A. A stabilizer of the formula ##STR6## wherein R.sub.3 and R.sub.4 can be identical or different and represent hydrogen, halogen, hydroxy, alkoxy, aryloxy, aralkoxy, alkyl, aralkyl, aryl, alkenyl or mono- or di-alkylamino radicals;
- R.sub.3 and R.sub.4 together with the carbonyl group can further form a ring;
- B. A stabilizer of the formula ##STR7## wherein R.sub.5 to R.sub.8 are identical or different and represent hydrogen, nitrile, halogen, carboxyl, carbaryloxy, carbalkoxy, alkoxy, aryloxy, acyloxy, alkyl, aryl, aralkyl or alkenyl and
- R.sub.5 and R.sub.6 and/or R.sub.7 and R.sub.8, or R.sub.5 and R.sub.7, and/or R.sub.6 and R.sub.8 together with the atoms to which they are linked, can further form a ring;
- and
- C. A stabilizer of the formula ##STR8## wherein R.sub.9 to R.sub.11 can be identical or different and represent alkyl, aryl, alkoxy, or aralkoxy and
- X denotes phosphorus or arsenic.
A color stabilized aromatic acid chloride of the formula ##STR9## wherein R.sub.1 and R.sub.2 independently represent hydrogen, halogen, alkyl or alkoxy containing 0.001 to 2% by weight of a color stabilizer selected from the group consisting of a compound of the formula ##STR10## wherein R.sub.3 and R.sub.4 can be identical or different and represent hydrogen, halogen, hydroxy, alkoxy, aryloxy, aralkoxy, alkyl, aralkyl, aryl, alkenyl or mono- or di-alkylamino radicals;
- R.sub.3 and R.sub.4 together with the carbonyl group can further form a ring of a compound of the formula ##STR11## wherein R.sub.5 to R.sub.8 are identical or different and represent hydrogen, nitrile, halogen, carboxyl, carbaryloxy, carbalkoxy, alkoxy, aryloxy, acyloxy, alkyl, aryl, aralkyl or alkenyl and
- R.sub.5 and R.sub.6 and/or R.sub.7 and R.sub.8, or R.sub.5 and R.sub.7, and/or R.sub.6 and R.sub.8 together with the atoms to which they are linked can further form a ring;
- and of a compound of the formula ##STR12## wherein R.sub.9 or R.sub.11 can be identical or different and represent alkyl, aryl, alkoxy or aralkoxy;
- and
- X denotes phosphorus or arsenic.
Dependencies are inferred from the claim text.