Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1973-10-02
1976-03-23
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 294R, 260 676R, C08g 5104
Patent
active
039459802
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.degree.-60.degree.C., and thereafter heating the emulsion at a temperature in the range of 60.degree.-200.degree.C. under normal atmospheric or superatmospheric pressure to effect the hardening of the resin.
REFERENCES:
patent: 2119189 (1938-05-01), Widmer
patent: 2938873 (1960-05-01), Kozenas
patent: 3303168 (1967-02-01), Kozenas
patent: 3428607 (1969-02-01), Renner
patent: 3454529 (1969-07-01), Casebolt
Fuzikawa Iwao
Tsubakimoto Tsuneo
Czaja Donald E.
Nippon Shokubai Kazaku Kogyo Co. Ltd.
Person S. M.
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