"ylformal resins, acetyl cellulose resins, maleic acid resins, vinyltolueneacrylate resins, terpene type resins, aliphatic, aromatic, copolymer or alicyclic type petroleum resins, cellulose derivatives such as methyl cellulose, hydroxyethyl cellulose and nitrocellulose and copolymers or blend polymers of these resins." . . . . . .