US3878019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing spot bonded non-woven webs using ultra-violet radiation
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1973-05-16
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Granted: 1975-04-15
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Expires: 1993-05-16
Abstract
Abstract A process for bonding non-woven webs by applying a film-forming polymer and subsequently cross-linking said polymer by photochemical means.
Inventors
- 👤 Charles Brian Chapman
- 👤 Robert Anthony Haldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:09
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/507; D06M15/51; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/66; D06M14/00; D06M14/18; D06M14/26; D06M14/30; D06M14/34; G; G03; G03F; G03F7/00; G03F7/0012; Y; Y10; Y10S; Y10S522/00; Y10S522/904; Y10S522/905; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/31504; Y10T428/31786; Y10T428/31794; Y10T442/00; Y10T442/60; Y10T442/659; Y10T442/666; Y10T442/667
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A PROCESS FOR PRODUCING A BONDED NON-WOVEN FLEXIBLE WEB COMPRISING: A. FORMING A NON-WOVEN WEB OF FIBROUS MATERIAL, B. APPLYING ON THE WEB A COATING OF A FILM-FORMING POLYMER CONTAINING A PHOTOSENSITIVE GROUP THEREIN OR ADDING THERETO A COMPOUND CONTAINING PHOTOSENSITIVE GROUPS, C. SUBJECTING DISCRETE LOCATIONS OF THE FILM-FORMING POLYMER COATED WEB TO ULTRA-VIOLET READIATION FOR A PERIOD OF TIME SUFFICIENT TO CAUSE CROSS-POLYMERIZATION OF THE FILM: FORMING POLYMER AT THE DISCRETE LOCATIONS TO THEREBY EFFECT POLYMER BONDING OF THE WEB AT THESE LOCATIONS, D. REMOVING UNPOLYMERIZED POLYMER FROM THE WEB THEREBY FORMING A FLEXIBLE WEB HAVING A BENDING LENGTH AS MEASURED BY A SHIRLEY STIFFNESS TESTER LESS THAN A FULLY BONDED WEB.
Claim 2
Dependent Claim
113 words
A PROCESS FOR PRODUCING A BONDED NON-WOVEN FLEXIBLE WEB COMPRISING: A. FORMING A NON-WOVEN WEB OF FIBROUS MATERIAL, B. APPLYING ON THE WEB A COATING OF A FILM-FORMING POLYMER CONTAINING A PHOTOSENSITIVE GROUP THEREIN OR ADDING THERETO A COMPOUND CONTAINING PHOTOSENSITIVE GROUPS, C. SUBJECTING DISCRETE LOCATIONS OF THE FILM-FORMING POLYMER COATED WEB TO ULTRA-VIOLET READIATION FOR A PERIOD OF TIME SUFFICIENT TO CAUSE CROSS-POLYMERIZATION OF THE FILM: FORMING POLYMER AT THE DISCRETE LOCATIONS TO THEREBY EFFECT POLYMER BONDING OF THE WEB AT THESE LOCATIONS, D. REMOVING UNPOLYMERIZED POLYMER FROM THE WEB THEREBY FORMING A FLEXIBLE WEB HAVING A BENDING LENGTH AS MEASURED BY A SHIRLEY STIFFNESS TESTER LESS THAN A FULLY BONDED WEB.
Claim 3
Dependent Claim
29 words
A process as in claim 1 wherein the non-woven web is constructed of fibres of material selected from the group consisting of natural organic material and synthetic organic material.
Claim 4
Dependent Claim
79 words
A process according to claim 1 wherein the web is a nylon web and the film-forming polymers are selected from the group consisting of homo- and copolymers derived from acrylonitrile, styrene, acrylamide, vinyl acetate alkyl acrylates and methacrylates, butadiene, acrylic acid, vinyl pyrrolidone, vinyl pyridine, polyethyl acrylate 2-hydroxyethyl acrylate and methacrylate, polyvinyl cinnamate and polyester elastomers and mixtures thereof and the photosensitive compounds are selected from the group consisting of benzophenone, sodium benzoate, 4-chloro-benzophenone, desoxy benzoin, benzaldehyde and benzil.
Claim 5
Dependent Claim
17 words
A process of claim 3 wherein the film-forming polymer is polyethyl acrylate and the photosensitisor is benzophenone.
Claim 6
Dependent Claim
17 words
A process of claim 3 wherein the film-forming polymer is polyvinyl cinnamate and the photosensitisor is benzophenone.
Claim 7
Dependent Claim
13 words
A non-woven polymer bonded flexible web prepared by the process of claim 1.
Claim 8
Dependent Claim
14 words
A process according to claim 1 in which the non-woven web contains staple fibres.
Claim 9
Dependent Claim
14 words
A process according to claim 1 in which the non-woven web contains continuous filaments.
Claim 10
Dependent Claim
18 words
A process according to claim 1 in which the non-woven web has been subjected to a needling treatment.
Claim 11
Dependent Claim
21 words
A process according to claim 1 in which the photosensitive group forms a part of the structure of the film-forming polymer.
Claim 12
Dependent Claim
18 words
A process according to claim 1 in which the photosensitive group forms a part of a separate compound.
Claim 13
Dependent Claim
19 words
A process according to claim 1 in which the coating is applied to the web by a spraying technique.
Claim 14
Dependent Claim
19 words
A process according to claim 1 in which the coating is applied to the web by an immersion technique.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |