Method of condensing and/or polymerizing sulfonated lignin conta

Details Method of condensing and/or polymerizing sulfonated lignin conta Method of condensing and/or polymerizing sulfonated lignin conta

1977-01-05

1978-07-11

Phillips, Delbert R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07G 100

Patent

active

041001559

ABSTRACT:
A method for polymerizing sulfonated lignin containing materials by adjusting the pH of the materials to a pH below 7, adjusting the moisture content of the materials to a value sufficient to allow the conversion to proceed, but less than 15 percent, and then subjecting the thus treated materials to heating at a temperature from 80.degree. to 225.degree. C in a manner to maintain the moisture content of the material at a value sufficient to allow the conversion to proceed, but less than 15 percent, and for a time period sufficient to form products having a viscosity of at least 25 percent higher than the viscosity of the starting material. The products obtained are useful as dispersants and extenders.

REFERENCES:
patent: 3138555 (1964-06-01), King et al.
patent: 3476740 (1969-11-01), Markham et al.
patent: 3544460 (1970-12-01), Markham et al.
patent: 3668123 (1972-06-01), Steinberg et al.

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