Process for producing dyed finely divided hardened benzoguanamin

Details Process for producing dyed finely divided hardened benzoguanamin Process for producing dyed finely divided hardened benzoguanamin

1976-07-12

1978-01-17

Person, Sandra M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 39SB, 260851, C08K 336

Patent

active

040691764

ABSTRACT:
A process for producing a dyed finely divided hardened resin of uniform particle size excelling in dispersibility which comprises, in combination, the steps of reacting benzoguanamine with formaldehyde in a ratio of 1.0 mole of the former to 1.2 - 3.5 moles of the latter in an aqueous medium at a pH ranging between 5 and 10 to prepare an aqueous liquid of a soluble and fusible resin having a degree of modified water tolerance of 0-150%, preparing an aqueous emulsion of a dyed soluble and fusible resin by using said aqueous liquid, a dye and a protective colloid, adding to the thus prepared aqueous emulsion in a ratio of 1 - 15 parts by weight per 100 parts by weight of the soluble and fusible resin of ultramicroscopic silica of a specific surface area as measured by the Brunauer, Emmett and Teller Method in the range of about 50 m.sup.2 /g to about 400 m.sup.2 /g and a particle size in the range of about 0.005 to about 0.05 micron, adding a curing catalyst, holding the aqueous emulsion for at least one hour at a temperature in the range of 40.degree.-60.degree. C., heating the aqueous emulsion at a temperature in the range of 60.degree.-200.degree. C. at normal atmospheric or superatmospheric pressure to harden the resin thereby preparing a suspension of a dyed finely divided hardened resin, and thereafter separating the hardened resin from the suspension followed by drying and de-aggregating the dried hardened resin.

REFERENCES:
patent: 2825708 (1958-03-01), Auer
patent: 3714085 (1973-01-01), Berstein et al.
patent: 3879335 (1975-04-01), Storck et al.
patent: 3945980 (1976-03-01), Tsubakimota et al.

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