Claims
- 1. A method for accelerating the hardening of a phenolic resole resin composition at a temperature of about 60.degree. F. to 120.degree. F. which comprises mixing:
- A. a hardenable phenolic resole resin having a pH of about 4.5 to 9.5, a solids content of about 50% to 90% by weight of the resin, and a viscosity of about 100 to 4,000 cps at 25.degree. C.;
- B. from about 5% to 50% by weight of the resin of a magnesium hardening agent selected from the group consisting of magnesium hydroxide and lightburned magnesium oxide, said magnesium oxide having a surface area of at least about 10 square meters per gram;
- C. from about 5% to 40% by weight of the resin of an ester functional hardening agent; and
- D. from about 0.5% to 5% by weight of the resin of an accelerator wherein the accelerator is a chelating agent selected from the group consisting of pentane-2,4-dione, heptane-2,4-dione, 2,2'-bipyridine and benzoylacetone.
- 2. The method of claim 1 wherein the resin has a viscosity of about 200 to 3,000 cps at 25.degree. C. and the hardening agent is magnesium oxide.
- 3. The method of claim 1 wherein the resin is the condensation product of phenol and formaldehyde at a molar ratio of one mole of phenol for each 1.1 to 2.2 moles of formaldehyde.
- 4. The method of claim 1 wherein the accelerator is pentane-2,4-dione.
- 5. The method of claim 2 wherein the magnesium oxide hardener consists essentially of particles having at least two different surface areas with about 25% to 75% thereof, by weight, having a surface area of at least 50 square meters per gram and 25% to 75% thereof by weight having a surface area of 10 to 25 square meters per gram.
- 6. The method of claim 2 wherein the ester functional hardening agent is a member selected from the group consisting of a lactone, a cyclic organic carbonate, a carboxylic acid ester, and mixtures thereof.
- 7. The method of claim 6 wherein the ester is a lactone.
- 8. The method of claim 7 wherein the lactone is gamma-butyrolactone.
- 9. The method of claim 6 wherein the ester is a carboxylic acid ester.
- 10. The method of claim 1 wherein the hardening agent is magnesium oxide and the resin is the condensation product of phenol and formaldehyde.
- 11. The method of claim 2 wherein the hardening agent is magnesium oxide having a surface area of from about 10 to 200 square meters per gram.
- 12. The method of claim 11 wherein the temperature is from about 60.degree. F. to 90.degree. F.
- 13. The method of claim 12 wherein the surface area is from about 25 to 65 square meters per gram.
- 14. The method of claim 10 wherein the pH is from about 5 to 9.
Parent Case Info
This application is a continuation-in-part of my application Ser. No. 07/562,206, which was filed on Aug. 2, 1990, now U.S. Pat. No. 5,096,983.
US Referenced Citations (18)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0094165 |
Nov 1983 |
EPX |
0202004 |
Nov 1986 |
EPX |
0243172 |
Oct 1987 |
EPX |
60-90251 |
May 1985 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Rozniak, Kryatyna, "Selected crosslinking catalytic polycondensation compounds", Polimery, 29(3): 95-99, Mar. 1984. |
Roczniak, Kryatyna, "Selected crosslinking catalytic polycondensation compounds", Zesz. Nauk.--Wyzsza Szk. Inz. Radomiu Materialozn. Chem, vol. 8, p. 283, 1985. |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
562206 |
Aug 1990 |
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