reaction vessel and the aforementioned resin varnish was added to this mixed solution after which it was cooked for 1 hour at 170 u00b0 c thereby yielding 2784 parts of gel varnish with a viscosity of 90 paxs and an n hexane tolerance of 6 0 g g after 660 parts of tall rosin glycerin ester regulated to acid value 20 conjugate resin acid content by percentage 45 aromatic resin acid content by percentage 40 were added to and melted in a reaction vessel 100 parts of af7 solvent and 851 parts of the resole resin solution of the aforementioned production example were added and this was reacted at 200 u00b0 c while removing condensed water thereby yielding 1488 parts of resin varnish with a weight average molecular weight of 250 000 on the other hand a mixed solution of 960 parts of af7 solvent 320 parts of soybean oil and 16 parts of gelling agent chelope ep 12 made by hope chemical co ltd was prepared in another reaction vessel and the aforementioned resin varnish was added to this mixed solution after which it was cooked for 1 hour at 170 u00b0 c thereby yielding 2784 parts of gel.