Process for the production of hard paper

Details Process for the production of hard paper Process for the production of hard paper

1981-06-15

1983-08-09

Lusignan, Michael R.

Coating processes

With post-treatment of coating or coating material

Heating or drying

156335, 162138, 427361, 427365, 427369, 427392, 427393, B05D 302

Patent

active

043978827

ABSTRACT:
A process for the preparation of hard paper involves impregnating lengths of cellulose-containing material with plasticizer-containing mixture of a phenol-resol resin solution and cresol-resol resin solution according to a one-step method, subsequent drying, and then hardening of the resin-impregnated paper. The impregnating solution employed is a mixture of a 50-80% by weight phenol-resol resin solution with a 40-70% by weight cresol-resol resin solution, to which has been admixed, before impregnation, a plasticizer and additional water. The water is added in amounts of 4-12% by weight, based on the sum total weight of solid resins and plasticizer in the total solution mixture.

REFERENCES:
patent: 2702758 (1955-02-01), Uhlig et al.
patent: 2877136 (1959-03-01), Booth
patent: 4074015 (1978-02-01), Franz et al.
patent: 4150188 (1979-04-01), Brulet

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