Patent US4424273A successfully refreshed from Google Patents.
US4424273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subbing polyester support bases and photographic film comprising said improved support bases
Assignee: 3M Co
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Filing: 1982-05-17
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Granted: 1984-01-03
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Expires: 2002-05-17
Abstract
Abstract The present invention relates to an improved photographic polyester support base coated with a first hydrophobic subbing layer and a second hydrophilic subbing layer, the improvement consisting of having said second subbing layer derived from a hardener containing, aqueous coating composition including (1) gelatin, (2) a vinyl addition polymer compound and (3) a low viscosity highly sulfonated water soluble polyacetal compound derived from the reaction of an aldehyde sulfonic acid compound with a polyvinyl alcohol compound, the relative quantities of said gelatin and vinyl addition polymer compound to the polyacetal compound being such as to provide good adhesion characteristics without any significant loss in antistatic properties.
Inventors
- 👤 Simone Franco
- 👤 Alberto Valsecchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:02
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A polyester support base coated with a first hydrophobic subbing layer and a second hydrophilic subbing layer for further coating with photographic layers, characterized by the fact that said second subbing layer is a hardened aqueous coating composition comprising ( 1) gelatin, (2) a vinyl addition polymer compound and (3) a low viscosity highly sulfonated water soluble polyacetal compound having at least 50% by weight of the polyacetal as sulfonated moieties, said compound derived from the reaction of an aldehyde sulfonic acid compound with a low viscosity polyvinyl alcohol compound having a viscosity of less than 1.5 dl/g, the relative quantities of said gelatin and vinyl addition polymer compound with respect to the polyacetal compound being such as to provide good adhesion characteristics without any significant loss in antistatic properties.
Claim 2
Dependent Claim
130 words
A polyester support base coated with a first hydrophobic subbing layer and a second hydrophilic subbing layer for further coating with photographic layers, characterized by the fact that said second subbing layer is a hardened aqueous coating composition comprising ( 1) gelatin, (2) a vinyl addition polymer compound and (3) a low viscosity highly sulfonated water soluble polyacetal compound having at least 50% by weight of the polyacetal as sulfonated moieties, said compound derived from the reaction of an aldehyde sulfonic acid compound with a low viscosity polyvinyl alcohol compound having a viscosity of less than 1.5 dl/g, the relative quantities of said gelatin and vinyl addition polymer compound with respect to the polyacetal compound being such as to provide good adhesion characteristics without any significant loss in antistatic properties.
Claim 3
Dependent Claim
17 words
A subbed support base according to claim 1 , wherein the aldehyde sulfonic acid is benzaldehyde-2,4-disulfonic acid.
Claim 4
Dependent Claim
28 words
A subbed support base according to claim 1, in which the sulfonated moieties of the polyacetal are present in the range of 50 to 85 percent by weight.
Claim 5
Dependent Claim
25 words
A subbed support base according to claim 1, in which the polyacetal compound has an intrinsic viscosity in the range of 0.2 to 0.8 dl/g.
Claim 6
Dependent Claim
17 words
A subbed support base according to claim 1, in which the vinyl addition polymer compound is polyethylacrylate.
Claim 7
Dependent Claim
15 words
A subbed support base according to claim 1, wherein the composition is hardened with glutaraldehyde.
Claim 8
Dependent Claim
18 words
A subbed support base according to claim 1, wherein the composition is hardened with a chlorinated triazine compound.
Claim 9
Dependent Claim
29 words
A subbed support base according to claim 1, wherein the gelatin is present in an amount of 20 to 60 percent by weight with respect to the polyacetal compound.
Claim 10
Dependent Claim
32 words
A subbed support base according to claim 1, wherein the vinyl addition polymer compound is present in an amount of 10 to 60 percent by weight with respect to the polyacetal compound.
Claim 11
Dependent Claim
26 words
A light-sensitive photographic film comprising a subbed support base according to any preceding claim and at least one photographic layer coated directly onto said subbing layer.
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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |