US Patent No: 6,251,220

Number of patents in Portfolio can not be more than 2000

Wastepaper deinking method using amine or acid salt of amine in the flotation stage

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Abstract

A deinking method comprising the steps of liberating ink from waste paper as a raw material and removing the liberated ink from a flotation system, wherein a nonionic surfactant, e.g., a reaction product obtained by adding an alkylene oxide to a mixture of an oil & fat and an alcohol, an alkylene oxide adduct of a fatty acid, or an alkylene oxide adduct of a higher alcohol, is used for the liberation of ink, and the flotation step is effected in the presence of a cationic compound, an amine, an acid salt of an amine or an amphoteric compound at a pH of from 4 to 9, provides a high quality deinked pulp having a high whiteness and a little residual ink spots.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KAO CORPORATIONTOKYO2482

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Irinatsu, Yuichi Wakayama, JP 5 30
Miyauchi, Yoshitaka Wakayama, JP 13 143
Takahashi, Hiromichi Wakayama, JP 33 280

Cited Art

Patent Info (Count) # Cites Year
 
GEO SPECIALTY CHEMICALS, INC. (2)
4,483,741 Low-foaming, pH sensitive, alkylamine polyether surface active agents and methods for using 32 1982
4,605,773 Low-foaming, pH sensitive, alkylamine polyether surface active agents and methods for using 21 1984
 
ANGLO-AMERICAN CLAYS CORPORATION (1)
4,293,097 Method for brightening natural calcitic ores 8 1979
 
GARDEN STATE PAPER COMPANY, INC. (1)
4,935,096 Process for the deinking of cellulosic materials 18 1988
 
HELLER FINANCIAL, INC. (1)
5,227,019 Wastepaper deinking process 25 1991

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
KEMIRA CHEMICALS, INC. (4)
7,862,685 Method for deinking pulp using premixed hydrophobically modified calcium carbonate particles 1 2006
7,897,010 Method for deinking pulp using premixed hydrophobically modified calcium carbonate particles 1 2007
8,317,973 Polyester surfactants for deinking 0 2009
8,287,690 Modified inorganic particles for deinking 0 2011
 
BASF AKTIENGESELLSCHAFT (1)
6,666,950 Process for deinking paper using a triglyceride 0 2001
 
THIELE KAOLIN COMPANY (1)
8,052,837 Deinking of waste paper 0 2006

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