Accelerators for curing phenolic resole resins
AssigneeBorden, Inc.
InventorArthur H. Gerber
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Abstract
There are disclosed methods and compositions for accelerating the hardening of phenolic resole resins having a pH of about 4.5 to 9.5 with lightburned magnesium oxide or magnesium hydroxide, with or without the addition of an ester functional hardening agent. Acceleration of hardening is achieved by incorporating into said compositions an effective quantity of a material which: increases the solubility of magnesium in the hardenable mixture; by certain amines; or by certain chelating agents. Accelerator compounds include those which provide chloride, sulfamate, nitrate, formate, and phosphite anions as well as selected tertiary amines.
Claims14
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.
Dependencies are inferred from the claim text.