Claims
- 1. A method for deinking waste paper, comprising:
- (I) pulping the waste paper,
- (II) subjecting the pulp to at least one treatment step selected from the group consisting of kneading, dispersing, chemical mixing and refining, and
- (III) subjecting the treated pulp to a flotation or washing step,
- wherein a deinking composition comprising water and a deinking agent selected from the group consisting of:
- (i) a reaction product having a solubility parameter of 8.9 to 10.2, which is obtained from the addition reaction of an alkylene oxide to a polyfunctional alcohol having 1 to 10 carbon atoms, wherein 1 to 4 moles of alkylene oxide units are added per 1 mole of functional group, provided that the total addition of alkylene oxide does not exceed 22 moles per 1 mole of polyfunctional alcohol;
- (ii) a reaction product having a solubility parameter of 8.9 to 10.2, which is obtained from the addition reaction of an alkylene oxide to a polyfunctional fatty acid having 1 to 10 carbon atoms, wherein 1 to 4 moles of alkylene oxide units are added per 1 mole of functional group, provided that the total addition of alkylene oxide does not exceed 22 moles per 1 mole of polyfunctional fatty acid; and
- (iii) a partial ester mixture having a solubility parameter of 8.9 to 9.8 and a degree of esterification of 15 to 75% by mole, which is formed by reacting the reaction product of (ii) with a fatty acid having 2 to 8 carbon atoms is added during steps (I) and, (II) and/or (III).
- 2. The method for deinking waste paper according to claim 1, wherein the ratio of the deinking composition added in step (I) to steps (II) and/or (III) is 10/90 to 90/10 by weight.
- 3. The method for deinking waste paper according to claim 1, wherein the waste paper is waste office automation (OA) papers or blends containing thereof.
- 4. The method for deinking waste paper according to claim 3, wherein the deinking composition comprises a deinking agent of the alkylene oxide adduct compound mixture (III).
- 5. The method according to claim 1, wherein said deinking agent is (IV).
- 6. The method according to claim 5, wherein said deinking agent is an ethylene oxide adduct of 2-ethylhexanol.
- 7. The method according to claim 1, wherein the deinking agent is added in an amount of 0.03 to 1.0 wt. %, based on the weight of the deinking composition.
- 8. A method for deinking waste paper, comprising:
- (I) pulping the waste paper,
- (II) subjecting the pulp to at least one treatment step selected from the group consisting of kneading, dispersing, chemical mixing and refining, and
- (III) subjecting the treated pulp to a flotation or washing step,
- wherein a deinking composition comprising water and a deinking agent selected from the group consisting of:
- (i) a reaction product having a solubility parameter of 8.9 to 10.2, which is obtained from the addition reaction of an alkylene oxide to a polyfunctional alcohol having 1 to 10 carbon atoms, wherein 1 to 4 moles of alkylene oxide units are added per 1 mole of functional group, provided that the total addition of alkylene oxide does not exceed 22 moles per 1 mole of polyfunctional alcohol;
- (ii) a reaction product having a solubility parameter of 8.9 to 10.2, which is obtained from the addition reaction of an alkylene oxide to a polyfunctional fatty acid having 1 to 10 carbon atoms, wherein 1 to 4 moles of alkylene oxide units are added per 1 mole of functional group, provided that the total addition of alkylene oxide does not exceed 22 moles per 1 mole of polyfunctional fatty acid; and
- (iii) a partial ester mixture having a solubility parameter of 8.9 to 9.8 and a degree of esterification of 15 to 75% by mole, which is formed by reacting the reaction product of (ii) with a fatty acid having 2 to 8 carbon atoms is added during steps (I) and (II).
- 9. The method according to claim 8, wherein said deinking agent is (IV).
- 10. The method according to claim 9, wherein said deinking agent is an ethylene oxide adduct of 2-ethylhexanol.
- 11. The method according to claim 8, wherein the deinking agent is added in an amount of 0.03 to 1.0 wt. %, based on the weight of the deinking composition.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-73048 |
Apr 1991 |
JPX |
|
3-73049 |
Apr 1991 |
JPX |
|
Parent Case Info
This application is a divisional of application Ser. No. 07/861,435, filed on Apr. 1, 1992, the entire contents of which are hereby incorporated by reference now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
241224 |
Oct 1987 |
EPX |
307024 |
Mar 1989 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
861435 |
Apr 1992 |
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