Solid formaldehyde-free pigment preparations
A pigment preparation, formaldehyde technology, used in adhesives, organic dyes, fibrous fillers, etc.
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[0068] 1) Preparation of carbonyl hydrogenated ketone / aldehyde resins (not of the invention)
[0069] 1200g of acetophenone, 220g of methanol, 0.3g of benzyltributylammonium chloride and 360g of 30% formaldehyde aqueous solution were preset and stirred evenly. Then 32 g of 25% aqueous caustic soda were added with stirring. Then 655 g of a 30% aqueous formaldehyde solution were added with stirring at 80 to 85° C. over 90 min. After stirring for 5 h at reflux temperature the stirrer was switched off and the aqueous phase was separated from the resin phase. The crude product was washed with aqueous acetic acid until a molten sample of the resin was clear. The resin is then dried by distillation.
[0070] 1270 g of a slightly yellowish resin were obtained. The resin is clear and brittle and has a melting point of 72°C. It is soluble in, for example, acetates such as butyl acetate and ethyl acetate, soluble in aromatics such as toluene and xylene, and insoluble in ethanol.
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