Claims
- 1. Method for protecting metal from erosion comprising treating the metal with a compound having the formula ##STR32## wherein A is an arylene radical and
- B is unsubstituted or halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted alkylene chain ##STR33## wherein R.sup.1 and R.sup.2 individually represent hydrogen and/or unsubstituted or halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted aliphatic, cycloaliphatic, araliphatic or aromatic radicals and
- n represents a number from 3 to 6,
- or
- B is unsubstituted or a halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted 1,8-naphthylene, 2,2'-diohenylene or 4,5-phenanthrylene radical.
- 2. Method of claim 1 wherein A is a naphthylene, phenylene, or diphenylene radical, R.sup.1 and R.sup.2 are, individually, hydrogen, a straight or branched chain aliphatic radical containing up to 8 carbon atoms, an araliphatic radical containing from 7 to 12 carbon atoms, unsubstituted or a halogen, lower alkyl, CF.sub.3, alkoxy, aryloxy or dialkylamino substituted naphthyl- or phenyl radical and R.sup.3 and R.sup.4 are, individually, hydrogen, a straight or branched chain aliphatic radical containing up to 12 carbon atoms, a cycloaliphatic radical containing up to 8 carbon atoms, or an araliphatic radical containing from 7 to 12 carbon atoms.
- 3. Method of claim 1 wherein A is a 2,3- or 3,4-pyridylene radical, a 1,2-,2,3- or 1,8-naphthylene radical or a 1,2-phenylene radical each optionally substituted by an alkyl group containing from 1 to 6 carbon atoms, R.sup.1 and R.sup.2 independently represent hydrogen, an alkyl radical containing up to 6 carbon atoms, a cyclopentyl radical, a cyclohexyl radical, a benzyl radical or a phenyl radical, and n is an integer of from 3 to 6.
- 4. Method of claim 1 wherein
- A is phenylene, naphthylene, optimally substituted by lower alkyl and halogen B is ##STR34## R.sup.1 and R.sup.2 are each hydrogen or lower alkyl, and n is 3 to 5.
- 5. Method of claim 1 wherein the compound is one of the formula ##STR35## in which D denotes a 2,3- or 3,4-pyridylene radical, a 1,2-, 2,3- or 1,8-naphthylene radical or 1,2-phenylene radical, these radicals being optionally substituted, preferably by alkyl with up to 6 C atoms,
- R.sup.5 and R.sup.6 represent hydrogen or alkyl with up to 6 carbon atoms, cyclopentyl, cyclohexyl, benzyl or phenyl, and
- m denotes one of the numbers 3, 4, 5 or 6, the m radicals R.sup.5 and R.sup.6 optionally being different.
- 6. Method of claim 1 wherein the compound is one of the formula ##STR36## wherein E denotes a substituted or unsubstituted radical selected from the group of 1,2-phenylene, 1,2-naphthylene and 2,3-pyridylene, and
- F denotes a substituted to unaubstituted radical selected from the group of trimethylene, pentamethylene, 2,2-diphenylene and 1,8-naphthylene.
- 7. Method of claim 1 wherein the compound is one of the formula ##STR37## wherein E denotes a substituted or unsubstituted radical selected from the group of 1,2-phenylene, 1,2-naphthylene and 2,3-pyridylene, and
- F denotes a substituted or unsubstituted radical selected from the group of trimethylene, pentamethylene, 2,2'-diphenylene and 1,8-naphthylene.
- 8. Method of claim 1 wherein the compound is one of the group consisting of
- 1,2-(3'-tert.-butyl-pentamethylene)-benzimidazole;
- 1,2-(3'-tert.-butyl-pentamethylene)-naphthimidazole;
- 1,2-naphthylene-(1',8')-benzimidazole;
- 4,6-dimethyl-1,2-pentamethylene-benzimidazole;
- 5,7-dimethyl-1,2-pentamethylene-benzimidazole;
- 1,2-trimethylene-pyrido-[2,3-d]-imidazole;
- 1,2-(1'-cyclohexylpentamethylene)-benzimidazole; and
- benzimidazo-[1,2-f]phenanthridine.
Priority Claims (1)
Number |
Date |
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Kind |
2435406 |
Jul 1974 |
DEX |
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Parent Case Info
This is a division, of application Ser. No. 591,789, filed June 30, 1975 now U.S. Pat. No. 4,048,174 Sept. 13, 1977.
US Referenced Citations (4)
Divisions (1)
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Number |
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591789 |
Jun 1975 |
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