Patent US4944723A successfully refreshed from Google Patents.
Patent US3751257A successfully refreshed from Google Patents.
US3751257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide-diazo resin composition
Assignee: 3M Co
•
Filing: 1971-04-16
•
Granted: 1973-08-07
•
Expires: 1991-04-16
Abstract
Abstract An oleophobic composition suitable as the ink-receptive areas for printing plates comprising as a dried coating at least 50 percent by weight of light-sensitive diazo resin and no more than 50 percent by weight of a polyamide resin. The printing plate so provided is developed by an aqueous solution of a wetting agent which removes unexposed portions of the diazo-polyamide resin coating without any substantial effect on the exposed portions.
Inventors
- 👤 K Dahlman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:11
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212; C; C08; C08L; C08L77/00; C09; C09D; C09D177/00; C09D177/02; C09D177/06
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
The composition of claim 1 wherein said diazo resin and said polyamide resin are both alcohol soluble.
Claim 2
Dependent Claim
47 words
The composition of claim 1 wherein said diazo resin and said polyamide resin are present in proportions sufficient to provide a dried coating comprising about 60 percent to about 70 percent by weight diazo resin and about 30 percent to about 40 percent by weight polyamide resin.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein said polyamide resin is a copolymer of caprolactam and the hexamethylene diamine salts of adipic and sebacic acid.
Claim 4
Dependent Claim
40 words
The composition of claim 1 wherein said polyamide resin is a copolymer of caprolactam and the hexamethylene diamine salts of adipic and sebacic acid and said diazo resin is a salt of the condensation product of paraformaldehyde and p-diazodiphenyl amine.
Claim 5
Dependent Claim
43 words
An article comprising a dimensionally stable substrate bearing a coating on at least one surface thereof comprising at least 50 percent by weight of a light-sensitive diazo resin and no more than about 50 percent by weight of a mutually soluble polyamide resin.
Claim 6
Dependent Claim
11 words
The article of claim 6 wherein said substrate is a metal.
Claim 7
Dependent Claim
10 words
The article of claim 6 wherein said substrate is paper.
Claim 8
Dependent Claim
16 words
The article of claim 6 wherein said polyamide and said diazo resin are soluble in alcohol.
Claim 9
Dependent Claim
48 words
The article of claim 6 wherein said diazo resin is present to the extent of about 60 percent to about 70 percent of said coating and said polyamide resin is present to the extent of about 30 percent to about 40 percent by weight of said polyamide resin.
Claim 10
Dependent Claim
40 words
The article of claim 6 wherein said polyamide resin is a copolymer of caprolactam, and the hexamethylene diamine salts of adipic and sebacic acid and said diazo resin is a salt of the condensation product of paraformaldehyde and p-diazodiphenyl amine.
Claim 11
Dependent Claim
19 words
The article of claim 6 wherein said surface of said substrate bearing said coating is a passivatably treated surface.
Claim 12
Dependent Claim
26 words
The article of claim 6 wherein said surface of said substrate is treated with a soluble silicate to passivate said surface with respect to said coating.
Claim 13
Dependent Claim
29 words
The article of claim 6 wherein said substrate is aluminum and said surface bears a treatment of a soluble silicate to passivate said surface with respect to said coating.
References Cited (Backward Citations)
US3660097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |