US3617439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving comminution pulp sheets and resulting air-laid absorbent products
Assignee: Georgia Pacific Nonwovens LLC
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Filing: 1969-01-02
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Granted: 1971-11-02
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Expires: 1989-01-02
Abstract
Abstract A method for producing comminution pulp sheets from cellulosic fibers and the products resulting therefrom as pulp sheets and air-laid absorbent batts, which method comprises impregnating the fibers of the comminution pulp sheets with about 0.1 to 2 percent of a selected zwitterionic surfactant, such as N-octadecyl -N, Ndimethylammonio-12-dodecanoate either in slurry prior to or during comminution pulp sheet formation and prior to pulp sheet drying. The resulting comminution pulp sheet is easily and effectively fiberized or comminuted to yield fibers from which air-laid absorbent products are prepared, and the air-laid absorbent products are characterized by improved bulk, resiliency and absorbency characteristics.
Inventors
- 👤 Benjamin E Chapman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:19
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/20; A61F; A61F13/00; A61F13/01; A61F13/01008; D; D21; D21C; D21C9/00; D21C9/001; D21C9/002; D21C9/005; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; A61F2013/00361; A61F2013/00727; A61F2013/00731
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A method for the manufacture of a comminution pulp sheet, which meThod comprises impregnating the cellulosic fibers of said pulp sheet, prior to final dewatering in sheet formation, with about 0.1 percent to 2.0 percent of a zwitterionic surfactant selected from the group consisting of N-octadecyl-N,N-dimethylammonio-12-dodecanoate, N-eicosyl-N,N-dimethylammonio-3-propane-1-sulfonate, N-tallowalkyl-N,N-dimethylammonio-2-hydroxy-3-propane-1-sulfonate, N-C16-C18alkyl (and alkenyl)-N,N-dimethylammonioacetate, N-(2-hydroxy, C16-C18alkyl)-N,N-dimethylammoniacetate, N-tallowalkyl-N,N-dimethylammonioacetate, N-soyaalkyl (and alkenyl)-N,N-dimethylammonioacetate, N-eicosyl (and docosyl)-N,N-dimethylammonioacetate, N-octadecyl-N,N-dimethylammonioacetate, N-octadecyl-N,N-dimethylammonioethylsulfate, and N-(1-methyl,C16-C18alkyl)-N,N-dimethylammonioacetate, whereby the comminution of said pulp sheet and the absorbency characteristics of air-laid absorbent pads produced therefrom are improved.
Claim 2
Dependent Claim
35 words
The method for the manufacture of a sheet of claim 2 wherein the comminution of pulp sheet is comprised of wood fibers, and said pulp sheet is impregnated with about 0.2 percent of zwitterionic surfactant.
Claim 3
Dependent Claim
34 words
The method for the manufacture of a comminution pulp sheet of claim 2 wherein said pulp sheet is impregnated with a zwitterionic surfactant by a displacement shower, prior to find dewatering in sheet formation.
Claim 4
Independent Claim
57 words
A method for the manufacture of a comminution pulp sheet, which method comprises impregnating the cellulosic fibers of said pulp sheet prior to final dewatering in sheet formation with about 0.1 percent to about 2.0 percent of N-tallowalkyl-N,N-dimethylammonioacetate, whereby the comminution of said pulp sheet and the absorbency characteristics of air-laid absorbent pads produced therefrom are improved.
Claim 5
Dependent Claim
142 words
A comminution pulp sheet, the cellulosic fibers of which pulp sheet are impregnated with about 0.1 percent to about 2.0 percent, based on the weight of active surfactant and the bone dry weight of said pulp sheet, of a zwitterionic surfactant having the general structure: wherein R1 is an alkyl or alkenyl group containing about 16 to about 22 carbon atoms, R2 and R3 are selected from the group consisting of hydrogen and alkyl groups containing one to two carbon atoms, R4 is an alkylene group containing one to about 11 carbon atoms, which alkylene group can have one or more hydroxyl groups attached to carbon atoms, and R5 is selected from the group consisting of -COO , -SO3 , and -OSO3 , whereby the comminution of said pulp sheet and the absorbency characteristics of air-laid absorbent pads produced therefrom are improved.
Claim 6
Dependent Claim
82 words
A comminution pulp sheet, the cellulosic fibers of which pulp sheet are impregnated with about 0.1 percent to about 2.0 percent, based on the weight of active surfactant and the weight of bone dry pulp, of a zwitterionic surfactant selected from the group consisting of N-octadecyl-N,N-dimethylammonio-12-dodecanoate, N-eicosyl-N,N-dimethylammonio-3-propane-1-sulfonate, N-tallowalkyl-N,N-dimethylammonio-2-hydroxy-3-propane-1-sulfonate, N-C16-C18alkyl (and alkenyl)-N,N-dimethylammonioacetate, N-(2-hydroxy,C16-C18alkyl)-N,N-dimethylammonioacetate, N-tallowalkyl-N,N-dimethylammonioacetate, N-soyaalkyl (and alkenyl)-N,N-dimethylammonioacetate, N-eicosyl (and docosyl)-N,N-dimethylammonioacetate, N-octadecyl-N,N-dimethylammonioacetate, N-octadecyl-N,N-dimethylammonioethylsulfate, and N-(1-methyl,C16-C18alkyl)-N,N-dimethylammonioacetate, whereby the comminution of said pulp sheet and the absorbency characteristics of air-laid absorbent pads produced therefrom aRe improved.
Claim 7
Dependent Claim
23 words
The comminution pulp sheet of claim 7, which comminution pulp sheet is comprised of wood fibers impregnated with about 0.2 percent of N-tallowalkyl-N,N-dimethylammonioacetate.
Claim 8
Dependent Claim
13 words
An air-laid absorbent pad produced from the comminution pulp sheet of claim 7.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |