Patent US5122230A successfully refreshed from Google Patents.
US5122230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for modifying hydrophilic fibers with substantially water-insoluble inorganic substance
Assignee: New Oji Paper Co Ltd
•
Filing: 1991-05-13
•
Granted: 1992-06-16
•
Expires: 2011-05-13
Abstract
Abstract A hydrophilic fibers modified with a substantially water-insoluble inorganic compound is produced by immersing hydrophilic fibers, for example, pulp fibers, in an aqueous solution of a water-soluble inorganic compound (a) which is precipitated when brought into contact with a precipitant (b), adjusting the amount of the aqueous solution impregnated in the hydrophilic fibers to 60 to 400% based on the weight of the hydrophilic fibers, and bringing the hydrophilic fibers with the aqueous solution of the inorganic compound (a) into contact with the precipitant in the state of a gas or aqueous solution to thereby cause the resultant substantially water-insoluble compound to be precipitated in and fixed to the hydrophilic fibers.
Inventors
- 👤 Keihachiro Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/11; D06M11/32; D06M11/36; D06M11/44; D06M11/45; D06M11/48; D06M11/51; D06M11/55; D06M11/58; D06M11/64; D06M11/68; D06M11/70; D06M11/71; D06M11/73; D06M11/76; D06M11/80; D06M11/82; D21; D21H; D21H11/00; D21H11/16; D21H13/00; D21H13/10; D21H13/12; D21H13/16; D21H13/18; D21H17/00; D21H17/63; D21H17/70; D06M2101/00; D06M2101/02; D06M2101/04; D06M2101/06; D06M2200/00; D06M2200/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
A process for modifying hydrophilic fibers with a substantially water-insoluble inorganic substance, comprising the steps of: immersing hydrophilic fibers in an aqueous solution comprising 6 to 60% by weight of a water-soluble inorganic compound (a) which is converted to a substantially water-insoluble inorganic compound when brought into contact with a precipitant (b); adjusting the amount of the water-soluble inorganic compound (a) aqueous solution impregnated in the hydrophilic fibers to a level of 60 to 400% based on the dry weight of the hydrophilic fibers; and bringing the impregnated hydrophilic fibers into contact with the precipitant (b) in the state of a gas, to cause the resultant substantially water-insoluble inorganic compound to be precipitated in and fixed to the hydrophilic fibers.
Claim 2
Dependent Claim
120 words
A process for modifying hydrophilic fibers with a substantially water-insoluble inorganic substance, comprising the steps of: immersing hydrophilic fibers in an aqueous solution comprising 6 to 60% by weight of a water-soluble inorganic compound (a) which is converted to a substantially water-insoluble inorganic compound when brought into contact with a precipitant (b); adjusting the amount of the water-soluble inorganic compound (a) aqueous solution impregnated in the hydrophilic fibers to a level of 60 to 400% based on the dry weight of the hydrophilic fibers; and bringing the impregnated hydrophilic fibers into contact with the precipitant (b) in the state of a gas, to cause the resultant substantially water-insoluble inorganic compound to be precipitated in and fixed to the hydrophilic fibers.
Claim 3
Dependent Claim
30 words
The process as claimed in claim 1, wherein the hydrophilic fibers are selected from at least one member of the group consisting of polyvinylalcohol fibers, polyacrylamide fibers and lignocellulosic fibers.
Claim 4
Dependent Claim
14 words
The process as claimed in claim 2, wherein the cellulosic fibers are pulp fibers.
Claim 5
Dependent Claim
49 words
The process as claimed in claim 1, wherein the water-soluble inorganic compound (a) is selected from the group consisting of aluminates, silicates and zincates of alkali metals, and the gaseous precipitant (b) comprises at least one acidic compound selected from the group consisting of carbon dioxide and hydrogen chloride.
Claim 6
Dependent Claim
35 words
The process as claimed in claim 1, wherein the water-soluble inorganic compound (a) is selected from the group consisting of silver nitrate, lead nitrate, and mercurous nitrate, and the gaseous precipitant (b) comprises a halogen.
Claim 7
Dependent Claim
42 words
The process as claimed in claim 1, wherein the water-soluble inorganic compound (a) is selected from the group consisting of silver nitrate, lead nitrate, copper sulfate, mercurous nitrate and tin (II or IV) nitrate and the gaseous precipitant (b) comprises hydrogen sulfide.
Claim 8
Dependent Claim
43 words
The process as claimed in claim 1, wherein the water-soluble inorganic compound (a) is selected from the group consisting of water-soluble salts of aluminum, chromium (III), zinc, manganese, iron (II or III), nickel and cobalt, and the gaseous precipitant (b) comprises hydrogen sulfide.
Claim 9
Dependent Claim
45 words
The process as claimed in claim 1, wherein the aqueous solution of the water-soluble inorganic compound (a) contains at least one water-soluble salt of an alkaline earth metal together with either ammonia or an alkali metal carbonate, and the gaseous precipitant (B) comprises carbon dioxide.
Claim 10
Dependent Claim
38 words
The process as claimed in claim 1, wherein the water-soluble inorganic compound (a) is a water-soluble salt of a metallic element other than an alkali metal, and the precipitant (b) comprises ammonia in the state of a gas.
Claim 11
Dependent Claim
40 words
The process as claimed in claim 9, wherein said water soluble salt is selected from the group consisting of water-soluble nitrates, chlorides, and sulfates of silver, zinc, aluminum, cobalt, zirconium, tin, titanium, iron, copper, lead, magnesium, cadmium, mercury, and chromium.
Claim 12
Dependent Claim
39 words
The process as claimed in claim 1, wherein the hydrophilic fibers impregnated with the aqueous solution of the water-soluble inorganic compound (a) are opened in the ambient air atmosphere before being brought into contact with the gaseous precipitant (b).
Claim 13
Dependent Claim
24 words
The process as claimed in claim 1, wherein the gaseous precipitant (b) is diluted by a gas non-reactive to the water-soluble inorganic compound (a).
References Cited (Backward Citations)
US113454A
Cited
US670511A
Cited
US2399982A
Cited
US2599091A
Cited
US2583548A
Cited
US2599093A
Cited
US2599094A
Cited
GB726803A
Cited
US2709653A
Cited
US2823997A
Cited
US3044924A
Cited
US3029181A
Cited
JPS62162098A
Cited
JPS62199898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-16 | 1995-12-16 | 1996-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-16 | 1999-12-16 | 2000-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-16 | 2003-12-16 | 2004-06-16 | $7700.00 | Window Closed / Lapsed |