US4219616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording materials for vesicular imaging
Assignee: Imperial Chemical Industries Ltd
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Filing: 1978-11-20
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Granted: 1980-08-26
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Expires: 1998-11-20
Abstract
Abstract Vesicular recording materials incorporate a sensitized layer comprising, as vehicle for the sensitizing agent, a quaternized polyelectrolyte, e.g. preferably polymers of dimethylamino ethyl methacrylate. The water sensitivity of the preferred polymers is reduced by copolymerisation with insolubilizing comonomers such as itaconic acid.
Inventors
- 👤 John A. Pope
- 👤 Stuart C. Rennison
- 👤 Ronald J. Stacey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:15
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/60
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A recording material suitable for vesicular imaging, which consists essentially of a polymeric vehicle and dispersed uniformly therein a sensitising agent which releases a vesicle-forming gas upon exposure to light so as to provide a latent gas image in the polymeric vehicle, said polymeric vehicle consisting of a polyelectrolyte having a nitrogen permeability constant in the range 1×10 -17 to 1×10 -10 and being softenable upon heating to permit the gas released by the sensitising agent in the light-struck areas to form light-scattering or reflecting vesicles therein.
Claim 2
Dependent Claim
87 words
A recording material suitable for vesicular imaging, which consists essentially of a polymeric vehicle and dispersed uniformly therein a sensitising agent which releases a vesicle-forming gas upon exposure to light so as to provide a latent gas image in the polymeric vehicle, said polymeric vehicle consisting of a polyelectrolyte having a nitrogen permeability constant in the range 1×10 -17 to 1×10 -10 and being softenable upon heating to permit the gas released by the sensitising agent in the light-struck areas to form light-scattering or reflecting vesicles therein.
Claim 3
Dependent Claim
33 words
A recording material according to claim 1, in which the polymeric vehicle is a cationic polyelectrolyte containing a sulphonium, phosphonium, quaternary ammonium or protonated primary, secondary or tertiary amine group as hereinbefore defined.
Claim 4
Dependent Claim
83 words
A recording material suitable for vesicular imaging, which consists essentially of a polymeric vehicle and dispersed uniformly therein a sensitising agent which releases a vesicle-forming gas upon exposure to light, said polymeric vehicle consisting essentially of a quaternised homopolymer or copolymer of an amino acrylate having a nitrogen permeability constant in the range 1×10 -17 to 1×10 -10 and being softenable upon heating to permit the gas released by the sensitising agent in the light-struck areas to form light-scattering or reflecting vesicles therein.
Claim 5
Dependent Claim
83 words
A recording material suitable for vesicular imaging, which consists essentially of a polymeric vehicle and dispersed uniformly therein a sensitising agent which releases a vesicle-forming gas upon exposure to light, said polymeric vehicle consisting essentially of a quaternised homopolymer or copolymer of an amino acrylate having a nitrogen permeability constant in the range 1×10 -17 to 1×10 -10 and being softenable upon heating to permit the gas released by the sensitising agent in the light-struck areas to form light-scattering or reflecting vesicles therein.
Claim 6
Dependent Claim
25 words
A recording material according to claim 3, in which the polymeric vehicle comprises a copolymer of 5 to 95 mole % of dimethylamino ethyl methacrylate.
Claim 7
Dependent Claim
25 words
A recording material according to claim 4, in which the polymeric vehicle comprises a copolymer of equimolar quantities of dimethylamino ethyl methacrylate and methyl methacrylate.
Claim 8
Dependent Claim
25 words
A recording material according to claim 3, in which the layer comprising the polymeric vehicle and the sensitising agent is overcoated with a water-impermeable layer.
Claim 9
Dependent Claim
42 words
A recording material according to claim 3, in which the polymeric vehicle is modified by the inclusion of an insolubilising anion in the polyelectrolyte, by cross-linking the polymer, or by admixing the polymer with a polymer insoluble or less soluble in water.
Claim 10
Dependent Claim
40 words
A recording material according to claim 3, in which the polyelectrolyte vehicle is derived from a copolymer of an amino acrylate and 1 to 25% mole % of itaconic acid based upon the total molar content of the comonomeric mixture.
Claim 11
Dependent Claim
23 words
A recording material according to claim 8, in which the proportion of itaconic acid in the copolymer does not exceed 15 mole %.
Claim 12
Dependent Claim
47 words
A recording material according to claim 9, in which the polyelectrolyte comprises a comonomer of 42.5 mole % dimethylamino ethyl methacrylate/42.5 mole % methyl methacrylate/15 mole % itaconic acid or a copolymer of 45 mole % dimethylamino ethyl methacrylate/45 mole % methyl methacrylate/10 mole % itaconic acid.
Claim 13
Dependent Claim
20 words
A recording material according to claim 8, in which the polymeric vehicle is a quaternised copolymer of an amino acrylate.
Claim 14
Dependent Claim
25 words
A recording material according to claim 8, in which the polymeric vehicle comprises a copolymer of 5 to 95 mole % of dimethylamino ethyl methacrylate.
References Cited (Backward Citations)
US3779774A
Cited
US4032344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-26 | 1984-02-25 | 1984-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-26 | 1988-02-25 | 1988-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-26 | 1992-02-25 | 1992-08-26 | $7700.00 | Window Closed / Lapsed |