US4457997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-component diazotype material
Assignee: Hoechst AG
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Filing: 1982-01-05
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Granted: 1984-07-03
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Expires: 2002-01-05
Abstract
Abstract A two-component diazotype material, composed of a support and a light-sensitive layer which is applied thereto and contains a polymeric binder, a diazonium salt, a coupler, an acid stabilizer and conventional additives, wherein the support is a biaxially oriented polyester film and the polymeric binder comprises a mixture of about 10-60 percent by weight of a polymer or copolymer of vinyl acetate, for example, a copolymer of vinyl acetate and crotonic acid, and about 40-90 percent by weight of a cellulose ester, such as cellulose acetopropionate, cellulose acetobutyrate, cellulose propionate or cellulose butyrate.
Inventors
- 👤 Klaus Thoese
- 👤 Hans-Dieter Frommeld
- 👤 Siegfried Scheler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:53
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/11; Y10S430/111; Y10S430/112
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A two-component diazotype material, comprising: a support comprising a biaxially oriented polyester film; and a light-sensitive layer which is applied to said support and comprises a polymeric binder, a diazonium salt, a coupler, and an acid stabilizer, wherein the polymeric binder comprises a mixture of from about 10 to 60 percent by weight of a copolymer of vinyl acetate and crotonic acid and from about 90-40 percent by weight of a cellulose ester selected from the group of cellulose acetopropionate, cellulose acetobutyrate, cellulose propionate and cellulose butyrate.
Claim 2
Dependent Claim
87 words
A two-component diazotype material, comprising: a support comprising a biaxially oriented polyester film; and a light-sensitive layer which is applied to said support and comprises a polymeric binder, a diazonium salt, a coupler, and an acid stabilizer, wherein the polymeric binder comprises a mixture of from about 10 to 60 percent by weight of a copolymer of vinyl acetate and crotonic acid and from about 90-40 percent by weight of a cellulose ester selected from the group of cellulose acetopropionate, cellulose acetobutyrate, cellulose propionate and cellulose butyrate.
Claim 3
Dependent Claim
28 words
A diazotype material as claimed in 1, wherein the copolymer of vinyl acetate and crotonic acid contains from about 4 to 12 percent by weight of crotonic acid.
Claim 4
Dependent Claim
16 words
A diazotype material as claimed in claim 1, wherein the support comprises a polyethylene terephthalate film.
Claim 5
Dependent Claim
25 words
A diazotype material as claimed in claim 1 or 3, further comprising an adhesive layer applied to one or both surfaces of the polyester film.
Claim 6
Dependent Claim
15 words
A diazotype material as claimed in claim 1, wherein said cellulose ester comprises cellulose acetopropionate.
Claim 7
Dependent Claim
29 words
A diazotype material as claimed in claim 5, wherein said binder comprises equal parts by weight of said cellulose ester and said copolymer of vinyl acetate and crotonic acid.
Claim 8
Dependent Claim
23 words
A diazotype material as claimed in claim 1, wherein said copolymer has an acid number within the range of about 30 to 90.
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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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |