US4303471A
Expired / Lapsed
US
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Method of producing fluffed pulp
Assignee: Nouryon Surface Chemistry AB
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Filing: 1979-07-20
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Granted: 1981-12-01
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Expires: 1999-07-20
Abstract
Abstract The invention relates to a method at the production of absorbent cellulose pulp, so-called fluff. By using certain nonionic fatty acid esters in combination with cationic retention agents, good disintegration properties of the cellulose pulp is obtained and the fluff which is obtained after dry-defibration has fast liquid absorption. The esters, which are used, are partially fatty acid esters of polyvalent alcohols, and as cationic retention agents quaternary ammonium compounds can e.g. be used.
Inventors
- 👤 Bente L. Laursen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/001; D21C9/002; D21C9/005; A; A61; A61L; A61L15/00; A61L15/16; A61L15/20; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
In the method that includes: forming a liquid suspension of cellulose pulp, removing a substantial portion of the liquid to form an essentially dry mass of cellulose pulp, and disintegrating the essentially dry mass of cellulose pulp into a fluff, the improvement which comprises reducing the amount of energy required to disintegrate said mass into fluff which comprises including in said liquid suspension a mixture of (a) a non-ionic compound in an amount sufficient to reduce the bonding forces between cellulose fibers, and (b) at least one cationic retention agent, said nonionic compound being a partial fatty acid ester of polyvalent alcohol having 2-8 carbon atoms, or an anhydride thereof, or a partial fatty acid ester of polyethylene glycol or polypropylene glycol having a molecular weight up to 500.
Claim 2
Dependent Claim
129 words
In the method that includes: forming a liquid suspension of cellulose pulp, removing a substantial portion of the liquid to form an essentially dry mass of cellulose pulp, and disintegrating the essentially dry mass of cellulose pulp into a fluff, the improvement which comprises reducing the amount of energy required to disintegrate said mass into fluff which comprises including in said liquid suspension a mixture of (a) a non-ionic compound in an amount sufficient to reduce the bonding forces between cellulose fibers, and (b) at least one cationic retention agent, said nonionic compound being a partial fatty acid ester of polyvalent alcohol having 2-8 carbon atoms, or an anhydride thereof, or a partial fatty acid ester of polyethylene glycol or polypropylene glycol having a molecular weight up to 500.
Claim 3
Dependent Claim
20 words
A method according to claim 1 characterized in that the nonionic compound is a fatty acid ester of diethylene glycol.
Claim 4
Dependent Claim
37 words
A method according to claim 1 or 2 characterized in that the fatty acid ester is used in combination with a quaternary ammonium compound containing at least one aliphatic hydrocarbon group having 8 to 20 carbon atoms.
Claim 5
Dependent Claim
31 words
The method according to claim 3 wherein the amount of the quaternary ammonium compound is 2 to 30 percent by weight of the total weight of said nonionic and cationic compounds.
Claim 6
Dependent Claim
60 words
A method according to claim 1 wherein said nonionic compound is selected from the group consisting of diethylene glycol mono-oleate, mono-oleate of polyethylene glycol, having a molecular weight of 200-400 and sorbitan monolaurate and said cationic retention agent is selected from the group consisting of didodecyl dimethyl ammonium chloride, didecylmethylamine, didecyl dimethyl ammonium chloride and didecyl methyl benzyl ammonium chloride.
Claim 7
Dependent Claim
78 words
A composition for facilitating the debonding of an aqueous cellulose pulp solution comprising in combination: (a) a non-ionic compound in an amount sufficient to reduce the bonding forces between celulose fibers, and (b) at least one cationic retention agent, said nonionic compound being a partial fatty acid ester of polyvalent alcohol having 2-8 carbon atoms, or an anhydride thereof, or a partial fatty acid ester of polyethylene glycol or polypropylene glycol having a molecular weight up to 500.
Claim 8
Dependent Claim
78 words
A composition for facilitating the debonding of an aqueous cellulose pulp solution comprising in combination: (a) a non-ionic compound in an amount sufficient to reduce the bonding forces between celulose fibers, and (b) at least one cationic retention agent, said nonionic compound being a partial fatty acid ester of polyvalent alcohol having 2-8 carbon atoms, or an anhydride thereof, or a partial fatty acid ester of polyethylene glycol or polypropylene glycol having a molecular weight up to 500.
Claim 9
Dependent Claim
20 words
A composition according to claim 6 characterized in that the nonionic compound is a fatty acid ester of diethylene glycol.
Claim 10
Dependent Claim
37 words
A composition according to claim 6 or 7 characterized in that the fatty acid ester is used in combination with a quaternary ammonium compound containing at least one aliphatic hydrocarbon group having 8 to 20 carbon atoms.
Claim 11
Dependent Claim
31 words
A composition according to claim 6 wherein the amount of the quaternary ammonium compound is 2 to 30 percent by weight of the total weight of said nonionic and cationic compounds.
Claim 12
Dependent Claim
60 words
A composition according to claim 6 wherein said nonionic compound is selected from the group consisting of diethylene glycol mono-oleate, mono-oleate of polyethylene glycol, having a molecular weight of 200-400 and sorbitan monolaurate and said cationic retention agent is selected from the group consisting of didodecyl dimethyl ammonium chloride, didecylmethylamine, didecyl dimethyl ammonium chloride and didecyl methyl benzyl ammonium chloride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |