| 摘要 |
834,757. Paper &c. containing porous substances. BADISCHE ANILIN- & SODAFABRIK A.G. July 18, 1958 [July 27, 1957], No. 23073/58. Class 96. Paper, e.g. for filtering, shoe linings, bactericidal use, sound insulation, or multiple-ply cardboard &c. which may be 50% less dense than usual cardboards, is formedfrom, e.g. sulphite or sulphate wood pulp, e.g. with up to 85% of mechanical wood pulp, or from esparto, straw, grasses, linen rags, or waste paper &c. by adding to the pulp, e.g. 5 to 80% of the paper of a porous, hardened condensation product, e.g. of phenol-, or urea-formaldehyde, or such products made from mono- or polymethyl-, propyl-, or butyl-phenols, or thiourea or biuret, or triazines, e.g. melamine, dicyandiamide or guanamide, &c. The foaming of the condensation product may be effected by nitrogen, oxygen, air, carbon dioxide, ammonia, or hydrogen sulphide, in the presence of an anionic wetting agent, and of a protective colloid, e.g. polyacrylic acid salts or casein, and of acidic hardening agents, softeners, &c. The paper pulp or the resin foam may be pigmented and fillers, e.g. china clay, satin white, blanc fixe, titanium white, metal powders, oxides or salts, may be included. The porous condensation products reduce the combustibility of the paper, and small amounts not taken up clarify the white water.
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