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| Method for making soft tissue |
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| Apparatus for drying a fibrous web |
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| Peripheral exhaust system for high velocity dryer |
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| Method and apparatus for forming battery terminal bushings |
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| Polycarbonate transesterification with tetraborate or tetraaluminate anion containing catalyst |
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Low temperature, moisture cure coating composition
| Details |
Inventors: Ley, David A.; Cady, Susan M.;
Assignee: American Cyanamid Co. (Stamford, CT)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A low temperature, moisture cure coating composition is provided. The coating composition, which is shelf stable, includes a crosslinkable, solvent borne, solution polymer containing certain activated ester groups, and a ketimine. Also provided is a crosslinked coating obtained by curing the composition. |
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DETAILED DESCRIPTION In the present invention, crosslinking utilizes the reaction between an activated ester group and a nucleophilic primary amine.
The activated ester group and the amine react very rapidly in solvent borne coating systems.
Accordingly, as explained earlier, prior art, solvent borne coating compositions containing activated ester groups were supplied as a two component system, and were characterized by a rather short pot life.
We have discovered that by blocking the nucleophilic primary amine groups through the formation of ketimines therefrom, a one component, solvent borne coating composition is provided.
This coating composition cures on exposure to atmospheric moisture, which hydrolyzes the ketimines to unblock the nucleophilic primary amine groups for reacting with the activated ester groups, as a result of which the polymer is crosslinked.
The significance of the discovery becomes plain when it is considered that in the prior art, solvent borne coating systems described above, the reaction is so rapid that coatings must be prepared within minutes of mixing the reactants; whereas, in the moisture cure compositions of the present invention, formulations can be prepared that, on the one hand, are stable for more than about two months, and yet, on the other hand, still can undergo crosslinking within hours under ambient cure conditions.
Thus, the moisture cure coating composition of the present invention makes commercially practicable a one component, solvent borne coating composition.
The essential components of the composition of the present invention include a solvent borne, solution polymer bearing particular activated ester groups, and a certain ketimine.
A necessary feature of the polymer is the presence of from about 1 to 100 wt.
% of repeating units derived from an activated ester group-containing vinyl monomer of the formula ##STR2## in which the R.
sup.
1 group is selected from H and CH.
sub.
3, and the R.
sup.
2 and R.
sup.
3 groups are independently selected from alkyls of 1-6 carbon atoms, cycloalkyls of 5-6 carbon atoms, and 2-hydroxyalkyls of 2-6 carbon atoms
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Manufacturing Materials 
