Accelerators for curing phenolic resole resins

Claim 1

A raw batch composition comprising a mixture of: A. an aggregate material; B. a hardenable phenolic resole resin having a pH of about 5 to 9, a resin solids content of about 50% to 90% by weight of said resin, and a viscosity of about 100 to 4,000 cps at 25° C.; C. from about 5% to 40% 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 10 square meters per gram; D. an accelerator in an amount sufficient to accelerate the hardening of said mixture, said accelerator selected from the group consisting of: (a) a 2,4-di(dialkylaminomethyl)phenol, a 2,6-di(dialkylaminomethyl)phenol, or a 2,4,6-tris(dialkylaminomethyl)phenol wherein each alkyl group has from 1 to 3 carbon atoms; (b) a 1,3,5-tri(lower alkyl)hexahydro-1,3,5-triazine wherein each alkyl group has from 1 to 3 carbon atoms; (c) 1,4-diazabicyclo[2.2.2]octane; and (d) a compound of the formula: ##STR5## wherein: each of R 1 and R 2 is a member selected from the group consisting of alkyl having 1 to 3 carbon atoms, and R 1 and R 2 when taken together with the nitrogen to which they are attached, represent a member selected from the group consisting of piperidino, piperazino, morpholino, thiomorpholino, and pyrrolidino; X is a member selected from the group consisting of (--CH 2 --) n wherein n is an integer of 1 to 6, --CH═CH--CH 2 --, --CH 2 --CH═CH--CH 2 --, ##STR6## and each of R 3 and R 4 is a member selected from the group consisting of hydrogen, alkyl of 1 to 3 carbon atoms, and R 3 and R 4 when taken together with the nitrogen to which they are attached represent a member selected from the group consisting of piperazino, morpholino, thiomorpholino, piperidino, and pyrrolidino.