US4187113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voided films of polyester with polyolefin particles
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1977-11-03
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Granted: 1980-02-05
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Expires: 1997-11-03
Abstract
Abstract Opaque voided films having a total luminous transmission not exceeding 25% are made from blends of a polyester preferably polyethylene terephthalate, with 3 to 27% of an ethylene or propylene polymer, prepared by dry blending. One end use of the film, as a base for photographic prints is also described.
Inventors
- 👤 Carl F. Mathews
- 👤 Christopher Deverell
- 👤 Gordon E. A. Pears
- 👤 Peter G. Knowles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/95; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31536
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
139 words
A photographic print material, which comprises a support in the form of an opaque molecularly oriented and heat set film produced from a blend of particles of a linear polyester produced by condensing at least one dicarboxylic acid, a lower alkyl diester thereof or bis-p-carboxyphenoxyethane with at least one glycol and from 3 to 27% by weight of particles of a homopolymer or copolymer of ethylene or propylene sufficient to increase the opacity of the resulting film, the homopolymer or copolymer being dispersed in the form of discrete particles throughout the oriented and heat set film, said support including voids between the regions of the linear polyester and the homopolymer or copolymer of ethylene or propylene sufficient to give said support a total luminous transmission not in excess of 20%, said support carrying a photosensitive silver halide-containing gelatinous layer.
Claim 2
Dependent Claim
139 words
A photographic print material, which comprises a support in the form of an opaque molecularly oriented and heat set film produced from a blend of particles of a linear polyester produced by condensing at least one dicarboxylic acid, a lower alkyl diester thereof or bis-p-carboxyphenoxyethane with at least one glycol and from 3 to 27% by weight of particles of a homopolymer or copolymer of ethylene or propylene sufficient to increase the opacity of the resulting film, the homopolymer or copolymer being dispersed in the form of discrete particles throughout the oriented and heat set film, said support including voids between the regions of the linear polyester and the homopolymer or copolymer of ethylene or propylene sufficient to give said support a total luminous transmission not in excess of 20%, said support carrying a photosensitive silver halide-containing gelatinous layer.
Claim 3
Dependent Claim
18 words
A photographic print material according to claim 1 wherein said film has a thickness of at least 100μ.
Claim 4
Dependent Claim
20 words
A photographic print material according to claim 1 wherein said film has a density in the range 0.7 to 1.20.
Claim 5
Dependent Claim
15 words
A photographic print material according to claim 1 wherein said linear polyester is polyethylene terephthalate.
Claim 6
Dependent Claim
33 words
A photographic print base, according to claim 1, in which a layer of a non-voided polyester or a polymer or copolymer of an α-olefine is applied to the surface of the opaque film.
Claim 7
Dependent Claim
120 words
A photographic print material, which comprises a support in the form of an opaque molecularly oriented and heat set film produced from a blend of particles of a linear polyester produced by condensing at least one dicarboxylic acid, a lower alkyl diester thereof or bis-p-carboxyphenoxyethane with at least one glycol and from 3 to 27% by weight of particles of a homopolymer of ethylene or propylene, the homopolymer being dispersed in the form of discrete particles throughout the oriented and heat set film, said support including voids between the regions of the linear polyester and the homopolymer sufficient to give said support a total luminous transmission not in excess of 20%, said support carrying a photosensitive silver halide-containing gelatinous layer.
Claim 8
Dependent Claim
120 words
A photographic print material, which comprises a support in the form of an opaque molecularly oriented and heat set film produced from a blend of particles of a linear polyester produced by condensing at least one dicarboxylic acid, a lower alkyl diester thereof or bis-p-carboxyphenoxyethane with at least one glycol and from 3 to 27% by weight of particles of a homopolymer of ethylene or propylene, the homopolymer being dispersed in the form of discrete particles throughout the oriented and heat set film, said support including voids between the regions of the linear polyester and the homopolymer sufficient to give said support a total luminous transmission not in excess of 20%, said support carrying a photosensitive silver halide-containing gelatinous layer.
Claim 9
Dependent Claim
15 words
A photographic print material according to claim 6 wherein said linear polyester is polyethylene terephthalate.
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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) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |