US4518681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of synthetic paper and the product thereof
Assignee: Dow Chemical Co
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Filing: 1983-12-23
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Granted: 1985-05-21
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Expires: 2003-12-23
Abstract
Abstract An improved process for making synthetic paper/film from a blend of polystyrene and polyethylene resins wherein titanium dioxide is employed as the sole inorganic filler and the film is given an oxidizing post-treatment, such as corona discharge or surface sulfonation. The film so-prepared has improved adhesion to photographic gel emulsions.
Inventors
- 👤 Oscar Johnson
- 👤 Robert A. Luecke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/915; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08L; C08L25/00; C08L25/02; C08L25/04; G03C1/7614; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
In a method of preparing a synthetic film having adhered thereto a photographic gel emulsion wherein the synthetic film comprises a blend comprising a styrene polymer resin, an ethylene polymer resin, and an inorganic filler, the improvement which comprises utilizing titanium dioxide as the sole inorganic filler and oxidizing at least one surface of the film so-prepared, thereby obtaining a synthetic film having the capability of enhanced adhesion to a photographic gel emulsion and adhering a layer of photographic gel emulsion to said oxidized surface of said synthetic film.
Claim 2
Dependent Claim
89 words
In a method of preparing a synthetic film having adhered thereto a photographic gel emulsion wherein the synthetic film comprises a blend comprising a styrene polymer resin, an ethylene polymer resin, and an inorganic filler, the improvement which comprises utilizing titanium dioxide as the sole inorganic filler and oxidizing at least one surface of the film so-prepared, thereby obtaining a synthetic film having the capability of enhanced adhesion to a photographic gel emulsion and adhering a layer of photographic gel emulsion to said oxidized surface of said synthetic film.
Claim 3
Dependent Claim
55 words
The improvement of claim 1, wherein the blend comprises from about 78 to about 88 weight percent styrene polymer resin, from about 3 to about 6 weight percent ethylene polymer resin, from about 3 to about 6 weight percent of an elastomeric polymer compound, and from about 6 to about 10 weight percent titanium dioxide.
Claim 4
Dependent Claim
33 words
The improvement of claim 2, wherein the styrene polymer resin is styrene homopolymer or thermoplastic styrene-butadiene copolymer, the ethylene polymer resin is ethylene homopolymer and the elastomeric compound is a styrene-butadiene star-block copolymer.
Claim 5
Dependent Claim
14 words
The improvement of claim 1, wherein the film surface is oxidized by corona discharge.
Claim 6
Dependent Claim
20 words
The improvement of claim 4, wherein the watt density employed in the corona discharge treatment is greater than about 8.
Claim 7
Dependent Claim
14 words
The improvement of claim 1, wherein the film surface is oxidized by surface sulfonation.
Claim 8
Dependent Claim
13 words
The improvement of claim 1, wherein the blend also includes an anti-static agent.
Claim 9
Dependent Claim
21 words
A synthetic film having adhered thereto a layer of a photographic gel emulsion prepared by the improved method of claim 1.
References Cited (Backward Citations)
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DE1929339A1
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GB1257512A
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DE1934096A1
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US3840625A
Cited
GB1421046A
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DE2558393A1
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |