| abstract |
A process for preparing a suspension of a finely divided hardened resin which comprises, in combination, the steps of reacting in an aqueous medium at a pH of 5-10 a member selected from the group consisting of benzoguanamine and a mixture of 100-50% by weight of benzoguanamine and 0-50% by weight of melamine with formaldehyde in a ratio of 1 mole of the former to 1.2-3.5 moles of the latter to prepare an aqueous liquid of a soluble and fusible resin having a degree of modified water tolerance of 0-150%, introducing this aqueous liquid to an aqueous solution of protective colloid with stirring to prepare an emulsion of a soluble and fusible resin, adding a curing catalyst to said emulsion, followed by holding same for at least one hour at a temperature in the range of 40 DEG -60 DEG C., and thereafter heating the emulsion at a temperature in the range of 60 DEG -200 DEG C. under normal atmospheric or superatmospheric pressure to effect the hardening of the resin. |