Claims
- 1. An article coated with a primer composition and an asphaltic coating, said primer composition being present in an amount sufficient to impart resistance to cathodic disbonding of said asphaltic coating from said article, said primer composition comprising chlorinated rubber, a 20% solution of the chlorinated rubber in toluene having a viscosity of from about 20 to about 300 centipoises at 25.degree. C., and an aromatic petroleum pitch having a softening point of from about 104.degree. F. to about 152.degree. F. and a specific gravity at 60.degree. F. of about 1.17, the weight ratio of chlorinated rubber to aromatic petroleum pitch being from about 0.8 to 1 to about 2 to 1.
- 2. The article of claim 1 wherein the article is metallic.
- 3. The article of claim 2 wherein the metallic article is pipe.
- 4. The metallic pipe of claim 3 wherein the pipe is steel.
- 5. The article of claim 3 wherein the coated metallic pipe has at least one asphalt-based coating thereover.
- 6. The article of claim 1 wherein the weight ratio of the chlorinated rubber to aromatic petroleum pitch is about 1:1.
- 7. A primer composition for imparting resistance to cathodic disbonding of an asphaltic coating from an article coated therewith, said primer composition consisting essentially of at least one chlorinated rubber, a 20% solution of said chlorinated rubber in toluene having a viscosity of from about 20 to about 300 centipoises at 25.degree. C, and at least one aromatic petroleum pitch, the components of the aromatic petroleum pitch being substantially aromatic and being obtained by heat cracking at at least 700.degree. C a member selected from the group consisting of crude petroleum oil, heavy oil, naphtha, asphalt, and mixtures thereof, and distilling off the cracked fractions of 400.degree. C and less, said chlorinated rubber and aromatic petroleum pitch being dissolved in at least one solvent therefor, the weight ratio of chlorinated rubber to aromatic petroleum pitch being at least about 0.8:1.
- 8. The composition of claim 7 wherein at least one solvent is aromatic, and the aromatic petroleum pitch has a softening point in the range of about 100.degree. F. to about 150.degree. F.
- 9. A primer for imparting resistance to cathodic disbonding of an asphaltic coating from a substrate coated therewith, said primer comprising a solution of
- (a) from about 8% to about 20% by weight of a chlorinated rubber, a 20% solution of the chlorinated rubber in toluene having a viscosity of from about 20 to about 300 centipoises at 25.degree. C.;
- (b) from about 4% to about 25% by weight of an aromatic petroleum pitch having a softening point of from about 104.degree. F. to about 152.degree. F. and a specific gravity at 60.degree. F. of about 1.17; and
- (c) from about 55% to about 88% by weight of an aromatic solvent for the chlorinated rubber and the aromatic petroleum pitch;
- the weight ratio of component (a) to component (b) being from about 0.8:1 to about 2:1.
- 10. The primer as defined by claim 9 wherein the weight ratio of component (a) to component (b) is about 1:1.
- 11. The primer as defined by claim 9 wherein the aromatic solvent is xylene.
- 12. The primer as defined by claim 9 wherein the aromatic solvent is an aromatic naptha solvent having a boiling range of from about 311.degree. F. to about 344.degree. F.
- 13. The primer as defined by claim 9 which further comprises (d) from about 0.3% to about 0.8% by weight of a storage stabilizer for the chlorinated rubber.
- 14. The primer as defined by claim 13 wherein the stabilizer is epichlorohydrin.
- 15. A primer for imparting resistance to cathodic disbonding of an asphaltic pipe coating from a pipe coated therewith, said primer comprising a solution of
- (a) about 13% by weight of a chlorinated rubber, a 20% solution of the chlorinated rubber in toluene having a viscosity of about 300 centipoises at 25.degree. C.;
- (b) about 13% by weight of an aromatic petroleum pitch having a softening point of from about 115.degree. F. to about 135.degree. F. and a specific gravity at 60.degree. F. of about 1.17; and
- (c) about 74% by weight of an aromatic solvent for the chlorinated rubber and the aromatic petroleum pitch.
- 16. The primer as defined by claim 15 wherein the aromatic solvent is xylene.
- 17. The primer as defined by claim 15 wherein the aromatic solvent is an aromatic naphtha solvent having a boiling range of from about 311.degree. F. to about 344.degree. F.
- 18. The primer as defined by claim 15 which further comprises
- (d) about 0.5% by weight of a storage stabilizer for the chlorinated rubber.
- 19. The primer as defined by claim 18 wherein the stabilizer is epichlorohydrin.
- 20. A method for imparting resistance to cathodic disbonding of an asphalt coating from a substrate coated therewith which comprises coating said substrate, prior to coating said substrate with said asphaltic coating, with a primer composition consisting essentially of at least one chlorinated rubber, a 20% solution of said chlorinated rubber in toluene having a viscosity of from about 20 to about 300 centipoises at 25.degree. C, and at least one aromatic petroleum pitch, the components of the aromatic petroleum pitch being substantially aromatic and being obtained by heat cracking at at least 700.degree. C a member selected from the group consisting of crude petroleum oil, heavy oil, naphtha, asphalt, and mixtures thereof, and distilling off the cracked fractions of 400.degree. C and less, said chlorinated rubber and aromatic petroleum pitch being dissolved in at last one solvent therefor, the weight ratio of chlorinated rubber to aromatic petroleum pitch being at least about 0.8:1.
- 21. The method according to claim 20 wherein the aromatic petroleum pitch has a softening point in the range of about 100.degree. F to about 150.degree. F.
- 22. The method according to claim 20 wherein the solvent for the aromatic petroleum pitch and chlorinated rubber is aromatic.
- 23. The method according to claim 22 wherein the aromatic solvent is xylene.
- 24. The method according to claim 22 wherein the aromatic solvent is an aromatic naphtha solvent having a boiling range of from 311.degree. F to about 344.degree. F.
- 25. The method according to claim 20 wherein the substrate is metallic.
- 26. The method according to claim 25 wherein the metallic substrate is a pipe.
Parent Case Info
This is a continuation, of application Ser. No. 633,125, filed Nov. 18, 1975 now abandoned.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
633125 |
Nov 1975 |
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