Patent US3634082A successfully refreshed from Google Patents.
US3634082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive naphthoquinone diazide composition containing a polyvinyl ether
Assignee: Shipley Co Inc
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Filing: 1967-07-07
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Granted: 1972-01-11
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Expires: 1987-07-07
Abstract
Abstract A photosensitive coating composition useful for the production of printing plates and for forming photoresists for metal plating and etching of metal, ceramic or the like comprising a lightsensitive diazo compound as photosensitizer, a polyvinyl ether, and preferably, an alkali soluble resinous material such as a novolak resin. The addition of the polyvinyl ether provides a coating of improved flexibility, electrical and chemical resistance, and thickness characteristics.
Inventors
- 👤 Carl W Christensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:40
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
The composition of claim 1, where the polyvinyl ether has a K value of at least 0.040.
Claim 2
Dependent Claim
14 words
The composition of claim 1 where the polyvinyl ether is a polyvinyl methyl ether.
Claim 3
Dependent Claim
14 words
The composition of claim 1 where the polyvinyl ether is a polyvinyl ethyl ether.
Claim 4
Dependent Claim
19 words
The composition of claim 1 where the ratio of the polyvinyl ether to photosensitizer varies between 0.5:1 and 6:1.
Claim 5
Dependent Claim
18 words
The composition of claim 1 where the ratio of polyvinyl ether to photosensitizer varies between 1:1 and 3:1.
Claim 6
Dependent Claim
44 words
The composition of claim 1 including as an additional additive a film-forming material which is alkali-resistant, light-insensitive forms a nontacky dried film within 10 minutes at 100* C., is compatible with he photosensitizer composition, and has a molecular weight ranging between 500 and 12,000.
Claim 7
Dependent Claim
48 words
The composition of claim 7 where the film forming material is selected from the group consisting of polystyrene; alpha methyl copolymer; the polymeric reaction product of melamine, formaldehyde, and a lower alkyl monoalcohol; the polymeric reaction product of benzoguanamine, formaldehyde and a lower alkyl monoalcohol; and sucrose benzoate.
Claim 8
Dependent Claim
28 words
The composition of claim 1 where the ratio of polyvinyl ether and novolak resin to photosensitizer is as follows: polyvinyl ether 0.5:1 to 6:1 novolak 1:1 to 6:1
Claim 9
Dependent Claim
12 words
A coating composition comprising the composition of claim 1 dissolved in solvent.
Claim 10
Dependent Claim
32 words
The coating composition of claim 10 where the solvent is selected from the group consisting of a glycol monoalkyl ether an aliphatic ester, an aliphatic ketone, a monocyclic aromatic and mixtures thereof.
Claim 11
Dependent Claim
37 words
The coating composition of claim 10 having the following composition: Photosensitizer 1-5 wt. percent novolak 4-12 wt. percent polyvinyl ether 1-10 wt. percent film forming additive 0-5 wt. percent dyes and plasticizers 0-2 wt. percent solvent remainder
Claim 12
Dependent Claim
27 words
Light-sensitive material adapted for use as a photoresist comprising a base having on at least one surface thereof a dry coating having the composition of claim 1.
Claim 13
Dependent Claim
46 words
The method of making a photoresist which comprises providing a coating composition on a base according to claim 13, exposing said coating to light in a predetermined pattern, and treating the exposed coating with weakly alkaline developing solution to remove exposed coating without removing unexposed portions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |