US3892575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of modifying the surface properties of a substrate
Assignee: 3M Co
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Filing: 1972-12-07
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Granted: 1975-07-01
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Expires: 1992-12-07
Abstract
Abstract This invention provided a way of modifying the surface properties of substrates such as films of plastics material. The substrate is given a very thin coating of a mixture of modifying materials and the latter is then bonded to the substrate by irradiation with ultra-violet light. A modifying material which gives the desired surface properties is present as an emulsion in a solution of a second modifier which is readily bondable to the substrate by ultraviolet light. Although the resulting bonded modifying material is so thin as to lead to negligible increase in weight, the surface properties of the substrate become those of the modifying material while its bulk properties remain the same. The invention is particularly useful for imparting hydrophilic surfaces to films of plastics material.
Inventors
- 👤 Ronald E Watts
- 👤 Louis A Errede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:31
CPC Classifications
B; B05; B05D; B05D3/00; B05D3/06; B05D3/061; B05D3/065; B05D3/067; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J7/056; G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/915; G03C1/93; B05D2201/00; B05D2401/00; B05D2401/20; B05D5/00; B05D5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A PROCESS FOR MODIFYING THE SURFACE PROPERTIES OF A SUBSTRATE BY BONDING TO SAID SUBSTRATE A COATING OF A MIXTURE OF TWO MODIFYING MATERIALS IN AN AMOUNT GIVING NO MORE THAN NEGLIGIBLE INCREASE IN WEIGHT AND A FINAL THICKNESS OF NO MORE THAN ABOUT 0.1 U COMPRISING A. COATING SAID SUBSTRATE WITH SAID MIXTURE IN WHICH ONE MODIFYING MATERIAL IS SELECTED TO PROVIDE FINALLY DESIRED SURFACE PROPERTIES AND THE OTHER IS SELECTED TO BE READILY BONDABLE TO SAID SUBSTRATE UNDER THE INFLUENCE OF ULTRAVIOLET LIGHT AND IS PRESENT AS AN EMULSION IN A SOLUTION OF THE FIRST SAID MODIFYING MATERIAL, DRYING SAID COATING AND B. IRRADIATING THROUGH SAID COATING AT A TEMPERATURE OF 60* TO 180*C TO THE INTERFACE WITH SAID SUBSTRATE WITH ULTRAVIOLET LIGHT OF WAVELENGTH ABOUT 180 TO 400 MM. FOR A TIME SUFFICIENT TO GIVE EFFECTIVE BONDING OF MODIFYING MATERIAL TO SAID SUBSTRATE WITHOUT SUBSTANTIAL DEGREDATION OF THE MOLECULES OF MODIFYING MATERIALS OF SUBSTRATE.
Claim 2
Dependent Claim
157 words
A PROCESS FOR MODIFYING THE SURFACE PROPERTIES OF A SUBSTRATE BY BONDING TO SAID SUBSTRATE A COATING OF A MIXTURE OF TWO MODIFYING MATERIALS IN AN AMOUNT GIVING NO MORE THAN NEGLIGIBLE INCREASE IN WEIGHT AND A FINAL THICKNESS OF NO MORE THAN ABOUT 0.1 U COMPRISING A. COATING SAID SUBSTRATE WITH SAID MIXTURE IN WHICH ONE MODIFYING MATERIAL IS SELECTED TO PROVIDE FINALLY DESIRED SURFACE PROPERTIES AND THE OTHER IS SELECTED TO BE READILY BONDABLE TO SAID SUBSTRATE UNDER THE INFLUENCE OF ULTRAVIOLET LIGHT AND IS PRESENT AS AN EMULSION IN A SOLUTION OF THE FIRST SAID MODIFYING MATERIAL, DRYING SAID COATING AND B. IRRADIATING THROUGH SAID COATING AT A TEMPERATURE OF 60* TO 180*C TO THE INTERFACE WITH SAID SUBSTRATE WITH ULTRAVIOLET LIGHT OF WAVELENGTH ABOUT 180 TO 400 MM. FOR A TIME SUFFICIENT TO GIVE EFFECTIVE BONDING OF MODIFYING MATERIAL TO SAID SUBSTRATE WITHOUT SUBSTANTIAL DEGREDATION OF THE MOLECULES OF MODIFYING MATERIALS OF SUBSTRATE.
Claim 3
Dependent Claim
27 words
A process as claimed in claim 1 in which the substrate is a polyester, a polyamide, a polyimide, a polymeric olefin, a modified cellulose or a metal.
Claim 4
Dependent Claim
99 words
A process as claimed in claim 1 in which the modifying material which provides is a member of the group consisting of a poly(ethylene oxide), poly(propylene oxide), sulphonated polystyrene, sulphonated poly(vinyl toluene), p-(n-dodecyl)benzene sulphonic acid, n-dodecyl dimethylamine, gelatin, modified cellulose, poly(vinyl pyrrolidone), poly(vinyl pyridine), maleic anhydride copolymer, poly- Beta -perfluoroctyl sulphonamide, polymer or copolymer of acrylic acids, acrylic acid amides, acrylic acid esters, polyvinyl alcohol, partially hydrolysed poly(vinyl acetate), polyethyleneimine, hydrocarbon polymer, fluorocarbon polymer, hydrocarbon and fluorocarbon copolymer including block copolymer, a siLicone polymer, water soluble urea formaldehyde condensate and compatible mixture of two or more of these compounds;
Claim 5
Dependent Claim
15 words
The process according to claim 1 wherein at least one modifying material absorbs ultra-violet light.
Claim 6
Dependent Claim
89 words
A process for the preparation of subbed hydrophilic photographic polyester film base wherein polyester film base is modified, with negligible increase in weight and to a thickness of less than 0.1 Mu , by first coating with a mixture of an aqueous emulsion of sulfonated polystyrene in a gelatine solution, drying and thereafter irradiating with ultra-violet light of a wavelength of 180 to 400 nm. for a time sufficient to give effective bonding of said sulfonated polystyrene and gelatine without substantial degradation thereof or of said polymer film base.
Claim 7
Dependent Claim
89 words
A process for the preparation of subbed hydrophilic photographic polyester film base wherein polyester film base is modified, with negligible increase in weight and to a thickness of less than 0.1 Mu , by first coating with a mixture of an aqueous emulsion of sulfonated polystyrene in a gelatine solution, drying and thereafter irradiating with ultra-violet light of a wavelength of 180 to 400 nm. for a time sufficient to give effective bonding of said sulfonated polystyrene and gelatine without substantial degradation thereof or of said polymer film base.
Claim 8
Dependent Claim
47 words
A subbed hydrophilic photographic film base comprising a polyester film base and effectively bonded to at least one surface a hydrophilic layer no more than 0.1 Mu thick imparting negligible increase in weight to said polyester film base said layer consisting essentially of sulphonated polystyrene and gelatine.
Claim 9
Dependent Claim
47 words
A subbed hydrophilic photographic film base comprising a polyester film base and effectively bonded to at least one surface a hydrophilic layer no more than 0.1 Mu thick imparting negligible increase in weight to said polyester film base said layer consisting essentially of sulphonated polystyrene and gelatine.
References Cited (Backward Citations)
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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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |