Anhydride and resorcinol latent catalyst system for improving cure characteristics of phenolic resins
View Patent ↗An anhydride and resorcinol latent catalyst system for a phenolic resole resin provides a resin having long pot life and long shelf life, yet cures quickly thereafter.
1. A phenolic resole resin comprising a phenolic component, an aldehyde component, an amine catalyst, and a latent catalyst system, said latent catalyst system comprising an acid anhydride and resorcinol, wherein the addition of the latent catalyst system does not reduce the storage stability of the resin, as reflected by the percent viscosity increase after 21 days at 25° C.
2. The resin of claim 1 wherein the amine is an organic amine compound and is present in a concentration of between about 0.0001 and about 0.2 moles per mole of phenolic component.
3. The resin of claim 2 wherein the organic amine compound is selected from the group consisting of hexamethylene tetraamine, hexamethylene triamine, dimethylethanolamine, triethylamine, triethanol amine, ethylene diamine, and blends thereof.
4. The resin of claim 2 wherein the acid anhydride is selected from the group consisting of maleic anhydride, phthalic anhydride, and blends thereof, and is present in a concentration of between about 0.1 and about 10 parts by weight per 100 parts of base resin.
5. The resin of claim 4 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol-containing resin having a molar excess of resorcinol, and blends thereof, and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
6. The resin of claim 2 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol-containing resin having a molar excess of resorcinol, and blends thereof, and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
7. The resin of claim 1 wherein the acid anhydride is selected from the group consisting of maleic anhydride, phthalic anhydride, and blends thereof, and is present in a concentration of between about 0.1 and about 10 parts by weight per 100 parts of base resin.
8. The resin of claim 7 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol-containing resin having a molar excess of resorcinol, and blends thereof, and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
9. The resin of claim 1 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol-containing resin having a molar excess of resorcinol, and blends thereof and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
10. A method for accelerating the cure time of a phenolic resole resin comprising a phenolic component and an aldehyde component and catalyzed with an amine catalyst, said method comprising mixing an acid anhydride and resorcinol latent catalyst system with the resin and curing the resin, wherein the addition of the acid anhydride and resorcinol latent catalyst system does not reduce the storage stability of the resin, as reflected by the percent viscosity increase after 21 days at 25° C.
11. The method of claim 10 wherein the amine is an organic amine compound and is present in a concentration of between about 0.0001 and about 0.2 moles per mole of phenolic component.
12. The method of claim 11 wherein the organic amine compound is selected from the group consisting of hexamethylene tetraamine, hexamethylene triamine, dimethylethanolamine, triethylamine, triethanol amine, ethylene diamine, and blends thereof.
13. The method of claim 11 wherein the acid anhydride is selected from the group consisting of maleic anhydride, phthalic anhydride, and blends thereof and is present in a concentration of between about 0.1 and about 10 parts by weight per 100 parts of base resin.
14. The method of claim 13 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol-containing resin having a molar excess of resorcinol, and blends thereof; and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
15. The method of claim 11 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resorcinol containing resin having a molar excess of resorcinol, and blends thereof, and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.
16. The method of claim 10 wherein the acid anhydride is selected from the group consisting of maleic anhydride, phthalic anhydride, and blends thereof, and is present in a concentration of between about 0.1 and about 10 parts by weight per 100 parts of base resin.
17. The method of claim 10 wherein the resorcinol is selected from the group consisting of resorcinol solid, resorcinol in aqueous or organic solution, or a resoreinol containing resin having a molar excess of resorcinol, and blends thereof, and is present in a concentration of between about 0.1 and about 5 parts by weight per 100 parts of base resin.