Deinking agent for regenerating waste paper and method for deink

Details Deinking agent for regenerating waste paper and method for deink Deinking agent for regenerating waste paper and method for deink

1996-08-23

1998-11-17

Silverman, Stanley S.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

510174, D21C 502

Patent

active

058370978

ABSTRACT:
A deinking agent for regenerating waste paper is provided, which can efficiently remove ink particles from the pulp fiber and obtain the regenerated pulp having a high brightness degree and a low content of residual ink. The deinking agent for regenerating waste paper comprises an enzyme and a compound represented by the general formula; R.sup.1 alkenyl group having 8--24 normal or branched chain carbon atoms; PO represents propylene oxide unit; EO represents ethylene oxide unit; AO represents alkylene oxide unit having not less than 3 carbon atoms; x and z represent respectively an integer of not less than 1 and satisfy the following formula, 10.ltoreq.x+z.ltoreq.100; y is an integer satisfying the following formula, 10.ltoreq.y.ltoreq.100; PO is added in the form of block configuration; and EO and AO are added in the form of block or random configuration).

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Prassad et al. "Enzyme deinking of black and white letterpress printed newsprint waste", Progress in paper recycling, pp. 21-30, May 1992.

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