US5145558A
Expired / Lapsed
US
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Composition for alkaline peroxide bleaching of wood pulp using a quaternary amine as additive
Assignee: Dow Chemical Co
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Filing: 1991-02-15
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Granted: 1992-09-08
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Expires: 2011-02-15
Abstract
Abstract A composition for alkaline hydrogen peroxide bleaching of mechanical wood pulp which employs a quaternary amine compound, such as (3-chloro-2-hydroxy-propyl) trimethyl ammonium chloride, in the stabilized bleach solution. The brightness of the final paper product made from such bleached pulp shows marked improvement over that in which only chelating agents are employed to improve the brightness according to the known art. The process is useful in both silicate and silicate-free bleach solutions.
Inventors
- 👤 Steven H. Christiansen
- 👤 Teresa Littleton
- 👤 Robert T. Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:26
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026; D21C9/1042
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
An alkaline composition for bleaching wood pulp comprising water, hydrogen peroxide, at least one stabilizer for the hydrogen peroxide and at least one quaternary amine represented by Formula I or Formula 2 wherein Formula I is: ##STR5## wherein R is an alkyl group containing 1-3 carbon atoms and R' is hydrogen, a halogen, hydroxyl, R or --N + (R) 3 , together with X - , and X - is a negatively charged counter-ion; and Formula 2 is: ##STR6## wherein R is an alkyl group containing 1-3 carbon atoms and X - is a negatively charged counter-ion wherein the water, stabilizer, and at least one quaternary amine are present in amounts to provide an alkaline composition.
Claim 2
Dependent Claim
116 words
An alkaline composition for bleaching wood pulp comprising water, hydrogen peroxide, at least one stabilizer for the hydrogen peroxide and at least one quaternary amine represented by Formula I or Formula 2 wherein Formula I is: ##STR5## wherein R is an alkyl group containing 1-3 carbon atoms and R' is hydrogen, a halogen, hydroxyl, R or --N + (R) 3 , together with X - , and X - is a negatively charged counter-ion; and Formula 2 is: ##STR6## wherein R is an alkyl group containing 1-3 carbon atoms and X - is a negatively charged counter-ion wherein the water, stabilizer, and at least one quaternary amine are present in amounts to provide an alkaline composition.
Claim 3
Dependent Claim
31 words
The composition of claim 1 wherein the stabilizer is a soluble silicate, aminocarboxylic acid, polyphosphate, polycarboxylic acid, polycarboxylic amide, sulfonic acid derivative of a polycarboxylic amide, aminophosphonic acid or combination thereof.
Claim 4
Dependent Claim
21 words
The composition of claim 2 wherein the stabilizer is in the form of an acid or of an alkali metal salt.
Claim 5
Dependent Claim
18 words
The composition of claim 2 wherein the stabilizer is an aminophosphonic acid, silicate, aminocarboxylic acid or combination thereof.
Claim 6
Dependent Claim
12 words
The composition of claim 4 wherein the stabilizer is an aminophosphonic acid.
Claim 7
Dependent Claim
12 words
The composition of claim 5 wherein the amino-phosphonic acid is diethylenetriaminepenta(methylenephosphonic acid).
Claim 8
Dependent Claim
22 words
The composition of claim 4 wherein the stabilizer is an alkali metal polyphosphate and an alkali metal salt of diethylenetriaminepenta(methylene phosphonic acid).
Claim 9
Dependent Claim
11 words
The composition of claim 2 wherein the stabilizer is a silicate.
Claim 10
Dependent Claim
38 words
The composition of claim 8 wherein there is additionally present wood pulp, and the quaternary amine is present in an amount of less than about 1 percent by weight based on oven dry weight of the wood pulp.
Claim 11
Dependent Claim
16 words
The composition of claim 8 wherein each R in Formula I or formula 2 is methyl.
Claim 12
Dependent Claim
33 words
The composition of claim 1 wherein R in Formula I or Formula 2 is an alkyl group containing 1-3 carbon atoms and R' is a halogen, hydroxyl or --N + (R) 3 .
Claim 13
Dependent Claim
18 words
The composition of claim 11 wherein each R in Formula I or Formula 2 is a methyl group.
Claim 14
Dependent Claim
25 words
The composition of claim 12 wherein quaternary amine is (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride, (2,3-epoxypropyl)trimethyl ammonium chloride, (2,3-dihydroxypropyl)trimethyl ammonium chloride, bis(trimethylammonium chloride)-2-hydroxy propane or a combination thereof.
Claim 15
Dependent Claim
13 words
The composition of claim 13 wherein the quaternary amine is (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride.
Claim 16
Dependent Claim
13 words
The composition of claim 13 wherein the quaternary amine is (2,3-epoxypropyl)trimethyl ammonium chloride.
Claim 17
Dependent Claim
13 words
The composition of claim 13 wherein the quaternary amine is (2,3-dihydroxypropyl)trimethyl ammonium chloride.
Claim 18
Dependent Claim
13 words
The composition of claim 13 wherein the quaternary amine is bis(trimethylammonium chloride)-2-hydroxy propane.
Claim 19
Dependent Claim
9 words
The composition of claim 1 additionally comprising wood pulp.
Claim 20
Dependent Claim
31 words
The composition of claim 18 wherein the quaternary amine is present in an amount of less than about 1 percent by weight based on oven dry weight of the wood pulp.
Claim 21
Dependent Claim
25 words
The composition of claim 18 wherein quaternary amine is (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride, (2,3-epoxypropyl)trimethyl ammonium chloride, (2,3-dihydroxypropyl)trimethyl ammonium chloride, bis(trimethylammonium chloride)-2-hydroxy propane or a combination thereof.
Claim 22
Dependent Claim
13 words
The composition of claim 20 wherein the quaternary amine is (3-chloro-2-hydroxypropyl)trimethyl ammonium chloride.
Claim 23
Dependent Claim
13 words
The composition of claim 20 wherein the quaternary amine is (2,3-dihydroxypropyl)trimethyl ammonium chloride.
Claim 24
Dependent Claim
13 words
The composition of claim 20 wherein the quaternary amine is bis(trimethylammonium chloride)-2- hydroxypropane.
Claim 25
Dependent Claim
14 words
The composition of claim 20 wherein the quaternary amine is (2,3-epoxypropyl) trimethyl ammonium chloride.
Claim 26
Dependent Claim
20 words
The composition of claim 18 wherein the stabilizer comprises an aminophosphonic acid, a silicate, an aminocarboxylic acid or combination thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-08 | 1996-03-09 | 1996-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-08 | 2000-03-09 | 2000-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-08 | 2004-03-09 | 2004-09-08 | $7700.00 | Window Closed / Lapsed |