Deinking agent for regenerating waste paper and method for deink

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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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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