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1. WO1981001022 - DESENCRAGE DE PAPIER DE REPRODUCTION ELECTRO-PHOTOGRAPHIQUE A JETER

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is
1. The method of removing toner from electrophotographic copy paper containing said toner comprising
pulping said paper containing said toner to form an aqueous pulp slurry which is mixable,
adding to said pulp slurry from 0.25 to 5% of the weight of the pulp fiber of a solid material selected from the group consisting of . polystyrene, polyvinyl chloride, polyurethane, polypropylene, and polyacrylates,
adding to said pulp slurry at least 0.75% of the weight of the pulp fiber a chemical which is substantially insoluble in water, has a melting point which is in the range of the approximate melting point of said solid material and 75°C, and is selected from a group consisting of a saturated aliphatic primary alcohol, a mixture of said primary alcohols, an unsaturated aliphatic primary alcohol, a mixture of said unsaturated alcohols, a saturated aliphatic secondary alcohol, a saturated aliphatic primary hydrocarbon, a mixture of said hydrocarbons, and a mixture of said hydrocarbons and said alcohols,
maintaining the temperature of said slurry at at least the melting point of said chemical for a period of at least one minute, and
a ter said period, removing said solid material from said slurry.
2. The method of claim 1 in which said saturated aliphatic primary alcohol has a chain length of 8 through 22 carbon atoms.
3. The method of claim 1 in which said unsaturated aliphatic primary alcohol has a chain length of 8 through 22 carbon atoms.
4. The method of claim 1 in which said saturated aliphatic secondary alcohol has a chain length of 8 carbon atoms.
5. The method of claim 1 in which said saturated aliphatic primary hydrocarbon has a chain length of 7 through 28 carbon atoms.
6. The process of claims 1, 2, 3, 4 or 5 in which the temperature of the process is in the range of the melting point of said ~ .chemical and 100°C.
7. The process of claims 1, 2, 3, 4 or 5 in which the temperature of the process is in the range of 30 and 100°C.
8. The process of claims 1, 2, 3, 4 or 5 in which the temperature of the process is in the range of 40 and 80°C.

9. The process of claims 1, 2, 3, 4 or 5 in which the time of the process is in the range of one minute and one hour.
10. The process of claims 1, 2, 3, 4 or 5 in which the time of the process is in the range of ten and thirty minutes.

AMENDED CLAIMS
(received by the International Bureau on 20 March 1981 (20.03.81))

(amended) 1- The method of removing toner from electrophotographic copy paper containing said toner comprising
pulping said paper containing said toner to form an aqueous pulp and toner slurry which is mixable,
adding to said pulp slurry from 0.25 to 5% of the weight of the pulp fiber of a solid material selected from the group consisting of polystyrene, polyvinyl chloride, polyurethane, polypropylene, and polyacrylates,
adding to said pulp slurry at least 0.75% of the weight of the pulp fiber a chemical which is substantially insoluble in water, has a melting point which is in the range of the approximate melting point of said solid material and 75°C, and is selected from a group consisting of a saturated aliphatic primary alcohol, a mixture of said primary alcohols, an unsaturated aliphatic primary alcohol, a mixture of said unsaturated alcohols, a saturated aliphatic secondary alcohol, a saturated aliphatic primary hydrocarbon, a mixture of said hydrocarbons, and a mixture of said hydrocarbons and said alcohols,
maintaining the temperature of said slurry at at least the melting point of said chemical for a period of at least one minute, and
after said period, removing said solid material and toner from said slurry.
2. The method of claim 1 in which said saturated aliphatic primary alcohol has a chain length of 8 through 22 carbon atoms.
3. The method of claim 1 in which said unsaturated aliphatic primary alcohol has a chain length of 8 through 22 carbon atoms.
4. The method of claim 1 in which said saturated aliphatic secondary alcohol has a chain length of 8 carbon atoms.
5. The method of claim 1 in which said saturated aliphatic primary hydrocarbon has a chain length of 7 through 28 carbon atoms.
6. The process of claims 1 , 2, 3, 4 or 5 in which the temperature of the process is in the range of the melting point of said chemical and 100°C.
7. The process of claims 1 , 2, 3, 4 or 5 in which the temperature of the process is in the range of 30 and 100°C.
8. The process of claims 1, 2, 3, 4 or 5 in
temperature of the process is in the range of 40 and 80°C.

9. The process of claims 1, 2, 3, 4 or 5 In which the time of the process is in the range of one minute and one hour.
10. The process of claims 1, 2, 3, 4 or 5 in which the time of the process is in the range of ten and thirty minutes.