Process for the manufacture of highly disperse solids consisting

Details Process for the manufacture of highly disperse solids consisting Process for the manufacture of highly disperse solids consisting

1976-06-03

1978-07-18

Woodberry, Edward M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From aldehyde or derivative thereof as reactant

260 294R, 528259, 528489, 528502, C08G 228

Patent

active

041015215

ABSTRACT:
To manufacture highly disperse solids of crosslinked urea-formaldehyde polycondensation products consisting of primary particles with an average diameter not greater than 1 micron, an aqueous solution consisting essentially of water and a precondensate of urea and formaldehyde is converted into a crosslinked gel by the addition of sulphamic acid or a water-soluble ammonium hydrogen sulphate, in the course of which the molar ratio of formaldehyde:urea should be greater than 1.2 and not greater than 2.0 not later than at the time of the formation of the gel. The resulting gel is comminuted, dried and disintegrated. The powders are suitable for use as pigments, carriers and absorbents.

REFERENCES:
patent: 2466744 (1949-04-01), Scott
patent: 3553115 (1971-01-01), Curchod
patent: 3712879 (1973-01-01), Strickrodt
patent: 3953421 (1976-04-01), Berstein
South African Patent Journal-69/1862, 9/17/69, p. 199.

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