US3911170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing porous materials
Assignee: Fujifilm Holdings Corp
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Filing: 1973-06-11
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Granted: 1975-10-07
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Expires: 1993-06-11
Abstract
Abstract The present invention relates to a method for processing porous materials. The porous material is coated with a surface-coating material. The surface-coating material substantially completly prevents mass penetration of liquid into the porous material, but since the surface-coating material is not entirely cohesive or entirely film-forming, tiny pinholes are formed in the surface of the surface-coating material. This causes problems when a liquid is later applied to the porous material coated iwth the surfacecoating material because the liquid penetrates into the porous material. This problem is solved by, after applying the surfacecoating material and drying the same, applying thereto a ''''pinhole-filling dispersion,'''' which comprises a liquid and a finely dispersed substance therein, whereby the liquid easily penetrates through the pinholes in the surface-coating material, carrying the finely dispersed substance, whereafter, the finely dispersed substance ''''coagulates'''' in the pinholes and blocks them completely, whereby the combined surface-coating material/pinhole-clogging material forms a substantially impermeable film.
Inventors
- 👤 Satoru Honjo
- 👤 Masaaki Takimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:29
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/80; D21H19/82; D21H19/822; G; G03; G03G; G03G5/00; G03G5/10; G03G5/101; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
158 words
A METHOD FOR PROCESSING A POROUS PAPER COATED WITH A LAYER OF A SURFACE COATING OF A FILM-FORMING RESIN TO REDUCE OR REMOVE PINHOLES WHICH PERMIT THE PENETRATION OF A LIQUID AND WHICH EXIST IN THE SURFACE COATING OF A FILM-FORMING RESIN WHICH IS CAPABLE OF NEARLY PREVENTING PENETRATION OF A LIQUID TO THE POROUS MATERIAL, WHICH METHOD COMPRISES BRINGING SAID LAYER OF SURFACE-COATING RESIN INTO CONTACT WITH A PINHOLE-FILLING DISPERSION COMPRISING A LIQUID AND A FINELY DISPERSED SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF A COLORLESS PIGMENT, A PLASTIC PARTICLE OR A PIGMENT COATED WITH A PLASTIC THEREIN, SAID LIQUID EASILY PENETRATING INTO THE INTERIOR OF THE POROUS PAPER THROUGH PINHOLES FORMED IN SAID SURFACE-COATING RESIN AND CARRYING SAID FINELY DISPERSED SUBSTANCE INTO SAID PINHOLES, WHEREBY SAID FINELY DISPERSED SUBSTANCE FILLS AND SEALS SAID PINHOLES AND WHEREIN THE RATE OF PENETRATION OF SAID PINHOLE-FILLING DISPERSION IS FROM ABOUT 2 X 10**-4 MM3 TO ABOUT 60 X 10-4MM3/SEC.
Claim 2
Independent Claim
158 words
A METHOD FOR PROCESSING A POROUS PAPER COATED WITH A LAYER OF A SURFACE COATING OF A FILM-FORMING RESIN TO REDUCE OR REMOVE PINHOLES WHICH PERMIT THE PENETRATION OF A LIQUID AND WHICH EXIST IN THE SURFACE COATING OF A FILM-FORMING RESIN WHICH IS CAPABLE OF NEARLY PREVENTING PENETRATION OF A LIQUID TO THE POROUS MATERIAL, WHICH METHOD COMPRISES BRINGING SAID LAYER OF SURFACE-COATING RESIN INTO CONTACT WITH A PINHOLE-FILLING DISPERSION COMPRISING A LIQUID AND A FINELY DISPERSED SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF A COLORLESS PIGMENT, A PLASTIC PARTICLE OR A PIGMENT COATED WITH A PLASTIC THEREIN, SAID LIQUID EASILY PENETRATING INTO THE INTERIOR OF THE POROUS PAPER THROUGH PINHOLES FORMED IN SAID SURFACE-COATING RESIN AND CARRYING SAID FINELY DISPERSED SUBSTANCE INTO SAID PINHOLES, WHEREBY SAID FINELY DISPERSED SUBSTANCE FILLS AND SEALS SAID PINHOLES AND WHEREIN THE RATE OF PENETRATION OF SAID PINHOLE-FILLING DISPERSION IS FROM ABOUT 2 X 10**-4 MM3 TO ABOUT 60 X 10-4MM3/SEC.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein prior to the treatment with the pinhole-filling dispersion from 5 to 30 pinholes per cm2 are present and after the treatment with the pinhole-filling dispersion less than 5 pinholes per cm2 Are present.
Claim 4
Dependent Claim
34 words
The method of claim 2 where the pinholes have a diameter less than about 10 microns and the finely dispersed substance has a size equal to or less than the size of the pinholes.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein the size of the finely dispersed substance is from about 0.5 micron to about 5 microns.
Claim 6
Dependent Claim
33 words
The method of claim 3 wherein the liquid carrying the finely dispersed substance therein is selected from the group consisting of one or more volatile petroleum hydrocarbons, esters, ketones, alcohols and halogenated hydrocarbons.
Claim 7
Dependent Claim
49 words
The method of claim 1 wherein the surface coating resin is a polyalkyl acrylate, polymethacrylate, copolymer of an alkylacrylate, copolymer of an alkylmethacrylate, copolymer of a methacrylate, polystyrene, polyvinyl acetate, linear polyester, unsaturated polyester, alkyd epoxy resin, polyvinyl alcohol, polyvinylbenzyl trimethylammonium chloride or a copolymer of styrene and butadiene.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the finely dispersed substance comprises from about 1 to 20% by volume of the said liquid.
Claim 9
Dependent Claim
33 words
The method of claim 1 wherein the liquid carrying said finely dispersed substances therein is contacted with the surface-coating resin for about 2 seconds to about 40 seconds, after which drying is conducted.
Claim 10
Dependent Claim
14 words
The method of claim 8 wherein drying is at about 60* to about 120*C.
Claim 11
Dependent Claim
12 words
The method of claim 8 which consists essentially of the recited steps.
Claim 12
Dependent Claim
14 words
The method of claim 1 where the finely dispersed substance is a colorless pigment.
Claim 13
Dependent Claim
14 words
The method of claim 1 wherein the finely dispersed substance is a plastic particle.
Claim 14
Dependent Claim
17 words
The method of claim 1 wherein the finely dispersed substance is a pigment coated with a plastic.
Claim 15
Dependent Claim
29 words
The method of claim 1 where the pinholes have a diameter of less than about 10 microns and the finely dispersed substance has a size equal to the pinholes.
Claim 16
Dependent Claim
12 words
The method of claim 1 wherein said liquid is an organic liquid.
Claim 17
Dependent Claim
25 words
The method of claim 1 wherein the rate of penetration of said pinhole-filling dispersion of from 4 X 10 4 to 32 X 10 4mm3/sec.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |