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1. US4276118 - Deinking waste electrophotography copy paper

Office
États-Unis d'Amérique
Numéro de la demande 06083139
Date de la demande 09.10.1979
Numéro de publication 4276118
Date de publication 30.06.1981
Numéro de délivrance 4276118
Date de délivrance 30.06.1981
Type de publication A
CIB
D21L 5/02
B41M 7/00
BTECHNIQUES INDUSTRIELLES; TRANSPORTS
41IMPRIMERIE; LIGNARDS; MACHINES À ÉCRIRE; TIMBRES
MPROCÉDÉS D'IMPRESSION, DE REPRODUCTION, DE MARQUAGE OU DE COPIE; IMPRESSION EN COULEUR
7Traitement ultérieur des travaux imprimés, p.ex. chauffage, irradiation
D21C 5/02
DTEXTILES; PAPIER
21FABRICATION DU PAPIER; PRODUCTION DE LA CELLULOSE
CPRODUCTION DE LA CELLULOSE PAR ÉLIMINATION DES SUBSTANCES NON CELLULOSIQUES DES MATIÈRES CONTENANT DE LA CELLULOSE; RÉGÉNÉRATION DES LIQUEURS NOIRES; APPAREILS À CET EFFET
5Autres procédés pour obtenir de la cellulose, p.ex. cuisson des linters de coton
02Préparation à partir de vieux papiers
CPC
D21C 5/022
DTEXTILES; PAPER
21PAPER-MAKING; PRODUCTION OF CELLULOSE
CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
5Other processes for obtaining cellulose, e.g. cooking cotton linters
02Working-up waste paper
022Chemicals therefor
B41M 7/0009
BPERFORMING OPERATIONS; TRANSPORTING
41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING,
7After-treatment of prints, e.g. heating, irradiating, ; setting of the ink, protection of the printed stock
0009Obliterating the printed matter; Non-destructive removal of the ink pattern, e.g. for repetitive use of the support
Y02W 30/648
Déposants Weyerhaeuser Company
Inventeurs Quick Thomas H.
Titre
(EN) Deinking waste electrophotography copy paper
Abrégé
(EN)

The toners used for printing in the electrophotography processes such as xerography or laser printing are removed from copy paper. In the process, the paper is pulped to form an aqueous slurry. The toner is removed from the paper with a dual system of a collector and a collecting chemical. PAL The best collectors have solubility parameters similar to the toners so that the softened toner is slightly soluble in the collector. These include polystyrene, polyvinyl chloride and polyacrylates, e.g., polymethyl methacrylates. Other collectors which are operable but less satisfactory are polyurethane and polypropylene. The collector is in the form of prills, beads or sheets. The specific collector will depend upon the specific chemicals in the toner. PAL There are a number of requirements for the collecting chemical. It should be substantially insoluble in water. It should have a melting point that is at or below the approximate softening point of the toner or collector. It should be a saturated aliphatic primary alcohol, a mixture of such alcohols, an unsaturated aliphatic primary alcohol, a mixture of such unsaturated alcohols, a saturated secondary alcohol, a saturated aliphatic primary hydrocarbon, a mixture of such hydrocarbons, or a mixture of hydrocarbons and alcohols. PAL The process is operable at or above the melting point of the collecting chemical, and at a temperature at which the toner is softened, generally 38.degree.-75.degree. C.

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