Patent ID: 7928151

Claim:
A resin composition for a shell mold comprising a phenolic resin and an aromatic condensed phosphate ester, wherein the phenolic resin includes a blend of a novolak phenolic resin and a resol phenolic resin, and the aromatic condensed phosphate ester is selected from the group consisting of α-diphenoxyphosphoryl-ω-phenoxypoly (n=1 to 3) [oxy-1,4-phenyleneisopropylidene-1,4-phenyleneoxy(phenoxyphosphoryl)], phenylenebis(phenylcresolphosphate), 2,2-bis{4-[bis((mono- or di-)methylphenoxy)phosphoryloxy]phenyl}propane, 1,3phenylenebis (dixylenyl)phosphate, a compound represented by a following formula (I): wherein R 1 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, all R 1 may be the same or different, and R 2 represents an organic group having a bivalent aromatic group and having 6 carbon atoms, and mixtures thereof.