Abstract Ion-exchange paper in which at least 10 per cent, based on the dry weight of pulp, of discrete, preferably pulverized, particles of one or more ion-exchange resins passing U.S. Standard sieve No. 50 are uniformly distributed (see Group VIII) can be used e.g. to remove acidic impurities from lubricating oils. Paper containing mixed particles of cation-and anion-exchange resins is particularly suitable for purifying water.ALSO:Ion-exchange paper in which at least 10 per cent, based on the dry weight of pulp, of discrete, preferably micropulverized, particles of one or more ion-exchange resins passing U.S. Standard Sieve No. 50 are uniformly distributed (see Group VIII), is used for wrapping and preserving foodstuffs, in filter tips and cartridges for cigarettes and tobacco pipes and in catamenial appliances. Anion-exchange and/or cation-exchange resins may be used. Suitable cation-exchange resins are the sulphonated copolymers of styrene and divinylbenzene and copolymers of methacrylic acid and divinylbenzene. The anion-exchange resin may be a copolymer of styrene and divinylbenzene having quaternary ammonium groups joined by means of methylene groups to the aromatic nuclei. Anion-exchange resins made by reacting diethylenetriamine with an insoluble copolymer of ethyl acrylate and divinylbenzene or by reacting trimethylamine with a chloromethylated copolymer of styrene and divinylbenzene may be used. Alum or sulphuric acid, fillers, dyes, pigments and wet-strength resins such as urea - formaldehyde and melamine - aldehyde resins may be incorporated in the paper pulp. The paper may be rendered greaseproof by parchmentizing.
A PROCESS FOR MAKING CELLULOSIC PAPER STOCK HAVING SIGNIFICANT ION-EXCHANGE PROPERTIES, WHICH PROCESS MAXIMIZES THE RETENTIVITY OF THE ION-EXCHANGE MATERIALS INTRODUCED TO THE CELLULOSIC PULP FROM WHICH THE PAPER IS MADE, SAID PROCESS COMPRISING BEATING THE CELLULOSIC PULP TO A MINIMUM CANADIAN FREENESS OF APPROXIMATELY 685 ML., ADDING TO THE PULP DISCRETE PULVERIZED PARTICLES OF A FULLY CURED AND WATER-INSOLUBLE ION-EXCHANGE RESIN, SAID PARTICLES BEING FINE ENOUGH TO PASS THROUGH A U.S. STANDARD SIEVE NO. 50 AND BEING ADDED IN ANY DESIRED AMOUNT FROM 10% TO 300%, BASED ON THE WEIGHT OF THE DRY PULP, LAYING DOWN SHEETS FROM THE PAPER FURNISH, AND THEN DRYING THE SHEETS TO FORM THE PAPER STOCK.
Claim 2
Dependent Claim
112 words
A PROCESS FOR MAKING CELLULOSIC PAPER STOCK HAVING SIGNIFICANT ION-EXCHANGE PROPERTIES, WHICH PROCESS MAXIMIZES THE RETENTIVITY OF THE ION-EXCHANGE MATERIALS INTRODUCED TO THE CELLULOSIC PULP FROM WHICH THE PAPER IS MADE, SAID PROCESS COMPRISING BEATING THE CELLULOSIC PULP TO A MINIMUM CANADIAN FREENESS OF APPROXIMATELY 685 ML., ADDING TO THE PULP DISCRETE PULVERIZED PARTICLES OF A FULLY CURED AND WATER-INSOLUBLE ION-EXCHANGE RESIN, SAID PARTICLES BEING FINE ENOUGH TO PASS THROUGH A U.S. STANDARD SIEVE NO. 50 AND BEING ADDED IN ANY DESIRED AMOUNT FROM 10% TO 300%, BASED ON THE WEIGHT OF THE DRY PULP, LAYING DOWN SHEETS FROM THE PAPER FURNISH, AND THEN DRYING THE SHEETS TO FORM THE PAPER STOCK.