Hydroxyl-functional polyester resins
View Patent ↗A hydroxyl-functional polyester resin composition including the reaction product of (a) a divinylarene dioxide, and (b) at least one dicarboxylic acid; a process for making the hydroxyl-functional polyester resin composition; and a curable hydroxyl-functional polyester resin composition made therefrom. The cured product made from the above curable hydroxyl-functional polyester resin composition is thermally stable and offers improved properties such as a lower viscosity and a high heat resistance compared to known cured products prepared from known epoxy resins.
1. A resin composition comprising the reaction product of (a) a divinylarene dioxide, (b) at least one dicarboxylic acid; and (c) a reaction catalyst; wherein the reaction product comprises a soluble hydroxyl-functional polyester resin product and wherein said soluble hydroxyl-functional polyester resin product remains soluble at a temperature of from about 100° C. to about 250° C.; wherein the soluble hydroxyl-functional polyester resin product is a precursor to forming a cured thermoset; and wherein the soluble hydroxyl-functional polyester resin product being cured forms a hydroxyl-functional polyester resin based thermoset having a heat resistance of from about 50° C. to about 300° C. as measured by glass transition temperature using differential scanning calorimetry.
2. The resin composition of claim 1 , wherein the at least one divinylarene dioxide is in stoichiometric excess sufficient to form an epoxy ester resin.
3. The resin composition of claim 1 , wherein the at least one dicarboxylic acid is in stoichiometric excess sufficient to form a carboxy ester resin.
4. The resin composition of claim 1 , wherein the divinylarene dioxide comprises divinylbenzene dioxide, divinylnaphthalene dioxide, divinylbiphenyl dioxide, divinyldiphenylether dioxide, or mixtures thereof.
5. The resin composition of claim 1 , wherein the divinylarene dioxide is divinylbenzene dioxide.
6. The resin composition of claim 1 , wherein the concentration of the divinylarene dioxide ranges from about 1 weight percent to about 99 weight percent, and wherein the concentration of the dicarboxylic acid ranges from about 1 weight percent to about 99 weight percent.
7. The resin composition of claim 1 , wherein the dicarboxylic acid comprises isophthalic acid, terephthalic acid, adipic acid, or mixtures thereof.
8. The resin composition of claim 1 , wherein the reaction catalyst comprises ethyltriphenylphosphonium acetate-acetic acid complex; tetraphenylphosphonium bromide, 2-phenylimidazole; or mixtures thereof.
9. A curable hydroxyl-functional polyester resin composition comprising (i) at least one hydroxyl-functional polyester resin composition of claim 1 ; and (ii) at least one curing agent.
10. The curable composition of claim 9 , wherein the concentration of said the hydroxyl-functional polyester resin ranges from about 10 weight percent to about 100 weight percent, and wherein the concentration of the curing agent ranges from about 0.01 weight percent to about to about 90 weight percent.
11. The curable composition of claim 9 , wherein the curing agent comprises anhydrides, carboxylic acids, amine compounds, phenolic compounds, polyols, phenolic resoles, melamine resins, epoxy resins, or mixtures thereof.
12. The composition of claim 9 , including a curing catalyst; wherein the curing catalyst comprises phosphoric acid; an organosulfonic acid; benzenesulfonic acid; toluenesulfonic acid; triethylamine; tripropylamine; tributylamine; 2-methylimidazole; benzyldimethylamine; 2-phenylimidazole; or mixtures thereof.
13. The composition of claim 12 , wherein the concentration of the curing catalyst ranges from about 0.01 weight percent to about 20 weight percent.
14. A process for preparing a hydroxyl-functional polyester resin comprising reacting (a) a divinylarene dioxide, (b) at least one dicarboxylic acid; and (c) a reaction catalyst; to provide a soluble hydroxyl-functional polyester resin composition and wherein said soluble hydroxyl-functional polyester resin product remains soluble at a temperature of from about 100° C. to about 250° C.; wherein the soluble hydroxyl-functional polyester resin composition is a precursor to forming a cured thermoset; and wherein the soluble hydroxyl-functional polyester resin composition being cured forms a hydroxyl-functional polyester resin based thermoset having a heat resistance of from about 50° C. to about 300° C. as measured by glass transition temperature using differential scanning calorimetry.
15. A process for preparing a curable hydroxyl-functional polyester resin composition comprising admixing (i) the soluble hydroxyl-functional polyester resin of claim 1 ; and (ii) at least one curing agent.