Claims
- 1. A process of producing an aqueous film-forming coating composition having a Tg above room temperature comprising:
- a) charging a reaction zone with:
- 1) an aqueous film-forming polymer dispersion prepared from more than one ethylenically unsaturated monomer, including from about 4 to about 90 weight percent of acid-functional monomer(s), said polymer having pendant acid functionality and a calculated Tg of from greater than about room temperature to less than the decomposition temperature of said polymer, and
- 2) less than about a stoichiometric equivalent amount, based on acid functionality of said polymer, of an insoluble transition metal compound, solubility in water less than 0.4% at 60.degree. C. and
- b) maintaining the reaction zone at a temperature above about the calculated Tg and below the decomposition temperature of said polymer for a time sufficient to react said acid and metal to produce a composition having a Minimum Filming Temperature above that of the film-forming polymer starting material.
- 2. The process of claim 1, wherein the transition metal is selected from the group consisting of zinc, aluminum, tin, tungsten and zirconium.
- 3. The process of claim 1, wherein the transition metal compound is an oxide, hydroxide, carbonate or acetate.
- 4. The process of claim 1, wherein the reaction temperature is from above the calculated T.sub.g to below about 100.degree. C.
- 5. The process of claim 1, wherein the amount of transition metal compound is from about 10 to about 100 percent of the stoichiometric amount based on polymer acid functionality.
- 6. A process of producing an aqueous film-forming coating composition having a Tg above room temperature comprising:
- a) charging a reaction zone with:
- 1) an aqueous solution of film-forming polymer prepared from more than one ethylenically unsaturated monomer, including from about 4 to about 90 weight percent of acid-functional monomer(s), said polymer having pendant acid functionality and a calculated Tg of from greater than about room temperature to less than the decomposition temperature of said polymer, and:
- 2) a transition metal compound, and
- b) maintaining the reaction zone at a temperature above about the calculated Tg and below the decomposition temperature of said polymer for a time sufficient to produce a composition having a Minimum Filming Temperature above that of the film-forming polymer starting material.
- 7. The process of claim 6, wherein the transition metal is selected from the group consisting of zinc, aluminum, tin, tungsten and zirconium.
- 8. The process of claim 6, wherein the transition metal compound is an oxide, hydroxide, carbonate or acetate.
- 9. The process of claim 6, wherein the amount of transition metal charged to the reaction zone is less than about a stoichiometric equivalent based on polymer acid functionality.
- 10. The process of claim 9, wherein the amount of transition metal compound is from about 10 to about 100 percent of the stoichiometric amount based on polymer acid functionality.
- 11. The process of claim 6, wherein the reaction temperature is from above the calculated T.sub.g to below about 100.degree. C.
Parent Case Info
This application is a continuation of application Ser. No. 285,481, filed May 12, 1989 now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
285481 |
May 1989 |
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