Transparentized paper

Details Transparentized paper Transparentized paper

1993-05-10

1999-11-30

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162175, 427161, D21H 1914

Patent

active

059936037

ABSTRACT:
Transparentized paper is prepared by impregnating a paper web with a solution of a sucrose acetate isobutyrate in a lower alcohol and removing the residual alcohol. The preferred paper is 100% cotton rag content, the preferred lower alcohol solvent contains up to 5 carbon atoms, particularly isopropanol. In production, the transparentizing solution is applied to one side of a travelling paper web, excess solution is removed by an air knife, wire wound rod or other means, and residual solvent is removed by impinging hot air on the travelling web. The sucrose acetate isobutyrate can also be applied when fluidized by heating and in the absence of a solvent. The preferred content of sucrose acetate isobutyrate residual in the paper web is from about 10% to about 50% of the paper content of the transparentized paper.

REFERENCES:
patent: 1996858 (1935-04-01), Davidson
patent: 3404029 (1968-10-01), Dooley et al.
patent: 5055354 (1991-10-01), Simcoke

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