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US4710267A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for reducing discoloration and/or tackiness in processing waste paper fibers

Assignee: Nouryon Surface Chemistry AB
•
Filing: 1985-03-19
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Granted: 1987-12-01
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Expires: 2005-03-19
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Abstract

Abstract Waste paper fibers containing tacky impurities processed for the preparation of recycle paper fiber products in the presence of a surface-active tertiary amine or tertiary or quaternary ammonium compound, thereby reducing discoloration and tackiness.

Inventors

  • 👤 Leif Elsby
  • 👤 Agneta Carlsson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 13:45
CPC Classifications
D; D21; D21C; D21C5/00; D21C5/02; D21C5/022; D21C9/00; D21C9/08; D21C9/086; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/64

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 316 words
A process for reducing discoloration and tackiness in the processing of waste paper fibers which contain tacky impurities for the preparation of recycle paper fiber products, which comprises adding during processing the waste paper fibers which contain tacky impurities as an aqueous pulp suspension an amount effective to reduce discoloration and tackiness of a surface-active tertiary amine or tertiary or quaternary ammonium compound having the formula: ##STR9## in which: the groups X and Y are present only when N is tetravalent; A is selected from the group consisting of (i) alkyl having from one to about four carbon atoms; and (ii) B p H where B is an alkyleneoxy group derived from an alkylene oxide having from two to four carbon atoms or mixtures thereof, at least 50% of the alkyleneoxy groups being the ethyleneoxy groups; p is an average number representing the number of alkyleneoxy groups within the range from 1 to 30; m is a number from 1 to 3; X is selected from the group consisting of hydrogen, alkyl having from 1 to 2 carbon atoms, and hydroxyalkyl having from two to four carbon atoms; Y is an anion; R is selected from the group consisting of: ##STR10## where: R 1 is hydrocarbon having from about nine to about twenty-three carbon atoms; q is a number from 2 to 4; B and p are as above; ##STR11## where: B and p are as above; R 2 and R 3 are selected from the group consisting of hydrogen and alkyl having from one to about eighteen carbon atoms; and groups having the formula: ##STR12## where: X and Y are present only when the nitrogen is tetravalent; and A, X and Y are as above; ##STR13## where: R 4 is hydrocarbon having from about ten to about thirty-five carbon atoms; r is a number from 1 to 3; and B and p are as above.
Claim 2
Dependent Claim 316 words
A process for reducing discoloration and tackiness in the processing of waste paper fibers which contain tacky impurities for the preparation of recycle paper fiber products, which comprises adding during processing the waste paper fibers which contain tacky impurities as an aqueous pulp suspension an amount effective to reduce discoloration and tackiness of a surface-active tertiary amine or tertiary or quaternary ammonium compound having the formula: ##STR9## in which: the groups X and Y are present only when N is tetravalent; A is selected from the group consisting of (i) alkyl having from one to about four carbon atoms; and (ii) B p H where B is an alkyleneoxy group derived from an alkylene oxide having from two to four carbon atoms or mixtures thereof, at least 50% of the alkyleneoxy groups being the ethyleneoxy groups; p is an average number representing the number of alkyleneoxy groups within the range from 1 to 30; m is a number from 1 to 3; X is selected from the group consisting of hydrogen, alkyl having from 1 to 2 carbon atoms, and hydroxyalkyl having from two to four carbon atoms; Y is an anion; R is selected from the group consisting of: ##STR10## where: R 1 is hydrocarbon having from about nine to about twenty-three carbon atoms; q is a number from 2 to 4; B and p are as above; ##STR11## where: B and p are as above; R 2 and R 3 are selected from the group consisting of hydrogen and alkyl having from one to about eighteen carbon atoms; and groups having the formula: ##STR12## where: X and Y are present only when the nitrogen is tetravalent; and A, X and Y are as above; ##STR13## where: R 4 is hydrocarbon having from about ten to about thirty-five carbon atoms; r is a number from 1 to 3; and B and p are as above.
Claim 3
Dependent Claim 30 words
A process according to claim 1 in which the compound has the formula: ##STR14## where: R 1 , B, X, Y, m, p and q are as in claim 1.
Claim 4
Dependent Claim 63 words
A process according to claim 1 in which the compound has the formula: ##STR15## where: B, X, Y and p are as in claim 1, and R 2 and R 3 are alkyl having from one to about eighteen carbon atoms selected from the group consisting of CH 2 --N(B p H) 2 , where B and p are as in claim 1.
Claim 5
Dependent Claim 30 words
A process according to claim 1 in which the compound has the formula: ##STR16## where: R 4 , B, A, X, Y, m and p are as in claim 1.
Claim 6
Dependent Claim 15 words
A process according to claim 4 in which m is 2 and A is methyl.
Claim 7
Dependent Claim 31 words
A process according to claim 1 in which the compound is added in an amount within the range from about 0.05 to about 2% by weight of the dry waste fibers.
Claim 8
Dependent Claim 31 words
A process according to claim 1 in which the compound is added in an amount within the range from about 0.1 to about 1% by weight of the dry waste fibers.
Claim 9
Dependent Claim 21 words
A process according to claim 1 in which the compound is added to the pulp after deinking but before sheet formation.

References Cited (Backward Citations)

US3790606A Cited
SU926129A1 Cited
US4144122A Cited
US4264412A Cited
EP0013758A1 Cited
US4476323A Cited
JPS5725489A Cited
JPS5729691A Cited
JPS5742991A Cited
US4483741A Cited
JPS59150191A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-11-30 1991-06-01 1991-12-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-11-30 1995-06-01 1995-12-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-11-30 1999-06-01 1999-12-01 $7700.00 Window Closed / Lapsed

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