US3839142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming non-woven fibrous material
Assignee: Arjo Wiggins Ltd
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Filing: 1972-09-12
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Granted: 1974-10-01
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Expires: 1992-09-12
Abstract
Abstract Water-repellent non-woven fibrous sheet material is formed from a suspension of fibres in a foam containing a liquid medium, a gas, and a surface active agent. The sheet material formed from the suspension is treated to destroy the surface active agent via chemical reaction with polyvalent metal cations and is then saturated with an organic water-repellent material and is heated to effect drying of the sheet material.
Inventors
- 👤 D Clarke
- 👤 I Biggs
- 👤 W Wycombe
- 👤 M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:47
CPC Classifications
D; D21; D21F; D21F11/00; D21F11/002; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/37; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
84 words
A METHOD OF PRODUCING A WATER-REPELLENT NONWOVEN FIBROUS SHEET MATERIAL COMPRISING THE STEPS OF FORMING A SUSPENSION OF FIBRES IN A FOAM CONTAINING WATER, AIR, AND AN ANIONIC SURFACE ACTIVE AGENT, FORMING A NON-WOVEN FIBROUS SHEET MATERIAL FROM THE SUSPENSION, TREATING THE NON-WOVEN FIBROUS SHEET MATERIAL TO DESTROY THE SURFACE ACTIVITY OF SAID SURFACE ACTIVE AGENT IN THE MATERIAL VIA CHEMICAL REACTION WITH POLYVALENT METAL CATIONS, SATURATING THE TREATED MATERIAL WITH AN ORGANIC WATER-REPELLENT MATERIAL, AND HEATING THE SATURATED MATERIAL TO EFFECT DRYING THEREOF.
Claim 2
Independent Claim
84 words
A METHOD OF PRODUCING A WATER-REPELLENT NONWOVEN FIBROUS SHEET MATERIAL COMPRISING THE STEPS OF FORMING A SUSPENSION OF FIBRES IN A FOAM CONTAINING WATER, AIR, AND AN ANIONIC SURFACE ACTIVE AGENT, FORMING A NON-WOVEN FIBROUS SHEET MATERIAL FROM THE SUSPENSION, TREATING THE NON-WOVEN FIBROUS SHEET MATERIAL TO DESTROY THE SURFACE ACTIVITY OF SAID SURFACE ACTIVE AGENT IN THE MATERIAL VIA CHEMICAL REACTION WITH POLYVALENT METAL CATIONS, SATURATING THE TREATED MATERIAL WITH AN ORGANIC WATER-REPELLENT MATERIAL, AND HEATING THE SATURATED MATERIAL TO EFFECT DRYING THEREOF.
Claim 3
Dependent Claim
44 words
The method according to claim 1 in which said saturation of the treated material is effected with said organic waterrepellent material admixed with a latex and the saturated material is heated to a temperature sufficient to effect curing of the latex and water-repellent material.
Claim 4
Dependent Claim
22 words
The method according to claim 2 in which said admixture comprises stearato chromic chloride in isopropanol and a vinyl acetate/acrylic copolymer latex.
Claim 5
Dependent Claim
85 words
The method according to claim 3 in which said admixture is prepared by diluting wet latex using equal parts by weight of said latex and water, preparing said organic water-repellent material by adding 28 parts by weight of said stearato chromic chloride in isopropanol to 220 parts by weight of water while stirring rapidly, adding 2.5 parts by weight of hexamine dissolved in 15 parts by weight of water while stirring to buffer the solution, and blending the diluted latex with said organic water-repellent material.
Claim 6
Independent Claim
98 words
A method of producing a water-repellent non-woven fibrous sheet material comprising the steps of forming a suspension of fibres in a foam containing water, air and an anionic surface active agent; forming a non-woven fibrous sheet material from the suspension; washing the non-woven fibrous sheet material to destroy the surface activity of said surface active agent via chemical reaction with a solution containing a chemical selected from the group consisting of aluminum sulphate, aluminum triformate, aluminum chloride, and zirconium acetate; saturating the washed material with an organic water-repellent material; and heating the saturated material to effect drying thereof.
Claim 7
Independent Claim
98 words
A method of producing a water-repellent non-woven fibrous sheet material comprising the steps of forming a suspension of fibres in a foam containing water, air and an anionic surface active agent; forming a non-woven fibrous sheet material from the suspension; washing the non-woven fibrous sheet material to destroy the surface activity of said surface active agent via chemical reaction with a solution containing a chemical selected from the group consisting of aluminum sulphate, aluminum triformate, aluminum chloride, and zirconium acetate; saturating the washed material with an organic water-repellent material; and heating the saturated material to effect drying thereof.
Claim 8
Dependent Claim
43 words
The method according to claim 5 in which saturation of the treated material is effected with said organic water-repellent material admixed with a Latex and the saturated material is heated to a temperature sufficient to effect curing of the latex and water-repellent material.
Claim 9
Dependent Claim
28 words
The method according to claim 6 in which the treated material is saturated with an admixture comprising stearato chromic chloride in isopropanol and a vinyl acetate/acrylic copolymer latex.
Claim 10
Dependent Claim
82 words
The method according to claim 7 in which said admixture is prepared by diluting wet latex using equal parts by weight of latex and water, preparing a water-repellent material by adding 28 parts by weight of the stearato chromic chloride in isopropanol to 220 parts by weight of water while stirring rapidly, adding 2.5 parts by weight of hexamine dissolved in 15 parts by weight of water while stirring to buffer the solution, and blending the diluted latex with said water-repellent material.
Claim 11
Independent Claim
85 words
A method of producing a water-repellent non-woven fibrous sheet material comprising the steps of forming a suspension of fibres in a foam containing water, air, and a sodium dodecyl benzene sulphonate surface active agent; forming a non-woven fibrous sheet material from the suspension; washing the non-woven sheet material to destroy said surface active agent via chemical reaction with a 2 percent to 5 percent aluminium sulphate solution; saturating the treated material with an organic water-repellent material; and heating the saturated material to effect drying thereof.
Claim 12
Independent Claim
85 words
A method of producing a water-repellent non-woven fibrous sheet material comprising the steps of forming a suspension of fibres in a foam containing water, air, and a sodium dodecyl benzene sulphonate surface active agent; forming a non-woven fibrous sheet material from the suspension; washing the non-woven sheet material to destroy said surface active agent via chemical reaction with a 2 percent to 5 percent aluminium sulphate solution; saturating the treated material with an organic water-repellent material; and heating the saturated material to effect drying thereof.
Claim 13
Dependent Claim
44 words
The method according to claim 9 in which saturation of the treated material is effected with said organic water-repellent material admixed with a latex and the saturated material is heated to a temperature sufficient to effect curing of the latex and said water-repellent material.
Claim 14
Dependent Claim
28 words
The method according to claim 10 in which the treated material is saturated with an admixture comprising stearato chromic chloride in isopropanol and a vinyl acetate/acrylic copolymer latex.
Claim 15
Dependent Claim
82 words
The method according to claim 11 in which said admixture is prepared by diluting wet latex using equal parts by weight of latex and water, preparing a water-repellent material by adding 28 parts by weight of the stearato chromic chloride in isopropanol to 220 parts by weight of water while stirring rapidly, adding 2.5 parts by weight of hexamine dissolved in 15 parts by weight of water while stirring to buffer the solution, and blending the diluted latex with said water-repellent material.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |