US3914518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Barrier coated cellulosic substrates
Assignee: EIDP Inc
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Filing: 1974-05-22
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Granted: 1975-10-21
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Expires: 1994-05-22
Abstract
Abstract Water-sensitive cellulosic substrates coated on at least one surface with a barrier coating (e.g., vinylidene chloride copolymer or aluminum or iron orthophosphate) applied from an organic solvent wherein the substrate surface is first impregnated with about 0.15 to 1.5 g./m.2 of an alkali metal silicate (e.g., Na2SiO3 or Li2SiO3) wherein the mole ratio of SiO2 to alkali metal oxide is from about 1.6 to 4.6. A preferred coated substrate may be represented by the following sequence of layers: D R A W I N G
Inventors
- 👤 Vernon Charles Haskell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:11
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/0423; C08J7/043; C08J7/048; C08J7/052; C08J2301/00; C08J2301/06; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
89 words
IN A SHAPED ARTICLE COMPRISING A WATER-SENSITIVE REGENERATED CELLULOSE SUBSTRATE HAVING COATED ON AT LEAST ONE SURFACE THEREOF A MOISTURE AND OXYGEN BARRIER COATING CONSISTING ESSENTIALLY OF ALUMINUM ORTHOPHOSPHATE, IRON ORTHOPHOSPHATE, OR A VINYLIDENE CHLORIDE COPOLYMER APPLIED FROM AN ORGANIC SOLVENT, THE IMPROVEMENT WHEREIN INCREASED MOISTURE AND OXYGEN BARRIER PROPERTIES CAN BE OBTAINED, WHICH IMPROVEMENT SONSISTS IN SAID SUBSTRATE SURFACE BEING FIRST IMPREGNATED WITH ABOUT 0.15 TO 1.5G/M.2 OF AN ALKALI METAL SILICATE WHEREIN THE MOLE RATIO OF SIO2 TO ALKALI METAL OXIDE IS FROM ABOUT 1.6 TO 4.6.
Claim 2
Dependent Claim
89 words
IN A SHAPED ARTICLE COMPRISING A WATER-SENSITIVE REGENERATED CELLULOSE SUBSTRATE HAVING COATED ON AT LEAST ONE SURFACE THEREOF A MOISTURE AND OXYGEN BARRIER COATING CONSISTING ESSENTIALLY OF ALUMINUM ORTHOPHOSPHATE, IRON ORTHOPHOSPHATE, OR A VINYLIDENE CHLORIDE COPOLYMER APPLIED FROM AN ORGANIC SOLVENT, THE IMPROVEMENT WHEREIN INCREASED MOISTURE AND OXYGEN BARRIER PROPERTIES CAN BE OBTAINED, WHICH IMPROVEMENT SONSISTS IN SAID SUBSTRATE SURFACE BEING FIRST IMPREGNATED WITH ABOUT 0.15 TO 1.5G/M.2 OF AN ALKALI METAL SILICATE WHEREIN THE MOLE RATIO OF SIO2 TO ALKALI METAL OXIDE IS FROM ABOUT 1.6 TO 4.6.
Claim 3
Dependent Claim
24 words
The article as defined in claim 1 wherein said alkali metal silicate is sodium silicate in an amount from about 0.3 to 1 g./m.2.
Claim 4
Dependent Claim
24 words
The article as defined in claim 1 wherein said alkali metal silicate is lithium silicate in an amount from about 0.3 to 1 g./m.2.
Claim 5
Dependent Claim
16 words
The article as defined in claim 1 wherein said barrier coating is a vinylidene chloride copolymer.
Claim 6
Dependent Claim
23 words
The article defined in claim 1 wherein the barrier coating contains aluminum orthophosphate with an aluminum to phosphorus ratio between 2.3 and 0.5.
Claim 7
Dependent Claim
18 words
The article defined in claim 5 wherein the barrier coating has a layer of vinylidene chloride copolymer thereover.
Claim 8
Dependent Claim
27 words
The article defined in claim 1 wherein the cellulosic substrate contains from about 5 to 12 percent of softener based on the total weight of the substrate.
Claim 9
Dependent Claim
22 words
The article defined in claim 1 wherein the mole ratio of SiO2 to alkali metal oxides is from about 2.5 to 4.
Claim 10
Dependent Claim
84 words
In a process for applying a moisture and oxygen barrier coating consisting essentially of aluminum orthophosphate, iron orthophosphate, or a vinylidene chloride copolymer to at least one surface of a water-sensitive regenerated cellulose substrate, said barrier coating applied from an organic solvent, the improvement of increasing the moisture and oxyGen barrier properties by first impregnating said surface with about 0.15 to 1.5 g./m.2 of an alkali metal silicate wherein the mole ratio of SiO2 to alkali metal oxide is from about 1.6 to 4.6.
Claim 11
Dependent Claim
84 words
In a process for applying a moisture and oxygen barrier coating consisting essentially of aluminum orthophosphate, iron orthophosphate, or a vinylidene chloride copolymer to at least one surface of a water-sensitive regenerated cellulose substrate, said barrier coating applied from an organic solvent, the improvement of increasing the moisture and oxyGen barrier properties by first impregnating said surface with about 0.15 to 1.5 g./m.2 of an alkali metal silicate wherein the mole ratio of SiO2 to alkali metal oxide is from about 1.6 to 4.6.
Claim 12
Dependent Claim
24 words
The process as defined in claim 9 wherein said alkali metal silicate is sodium silicate in an amount from about 0.3 to 1 g./m.2.
Claim 13
Dependent Claim
24 words
The process as defined in claim 9 wherein said alkali metal silicate is lithium silicate in an amount from about 0.3 to 1 g./m.2.
Claim 14
Dependent Claim
16 words
The process as defined in claim 9 wherein said barrier coating is a vinylidene chloride copolymer.
Claim 15
Dependent Claim
23 words
The process defined in claim 9 wherein the barrier coating contains aluminum orthophosphate with an aluminum to phosphorus ratio between 2.3 and 0.5.
Claim 16
Dependent Claim
18 words
The process defined in claim 13 wherein the barrier coating has a layer of vinylidene chloride copolymer thereover.
Claim 17
Dependent Claim
27 words
The process defined in claim 9 wherein the cellulosic substrate contains from about 5 to 12 percent of softener based on the total weight of the substrate.
Claim 18
Dependent Claim
22 words
The process defined in claim 9 wherein the mole ratio of SiO2 to alkali metal oxides is from about 2.5 to 4.
Claim 19
Dependent Claim
32 words
The process defined in claim 9 wherein the alkali metal silicate is applied to said film in an aqueous dispersion containing about 4 to 40 percent alkali metal silicate plus a softener.
Claim 20
Dependent Claim
24 words
The article as defined in claim 1 wherein the barrier coating contains iron orthophosphate with an iron to phosphorus ratio between 2.3 and 0.5.
Claim 21
Dependent Claim
25 words
The process as defined in claim 9 wherein the barrier coating contains an iron orthophosphate with an iron to phosphorus ratio between 2.3 and 0.5.
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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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |