Patent US4247616A successfully refreshed from Google Patents.
US4247616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive-acting photoresist composition
Assignee: 3M Co
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Filing: 1979-07-27
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Granted: 1981-01-27
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Expires: 1999-07-27
Abstract
Abstract A positive-acting light-sensitive composition having excellent utility as a photoresist, comprising: (a) a crosslinked urethane resin formed by a catalyzed crosslinking of a non-heat reactive novalac phenolic resin and a polyisocyanate compound; (b) an epoxy resin having an epoxide equivalent weight of less than about 400 and a curing agent therefor; and (c) a positive-acting photosensitizer. Upon applying to a substrate and drying, the epoxy resin cures, resulting in a film useful as a photoresist or in the formation of lithographic printing plates.
Inventors
- 👤 John P. Vikesland
- 👤 Richard M. Presley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/022; G03F7/023; G03F7/0233; G03F7/0236; G03F7/016; G03F7/021; G03F7/0212; G03F7/0217; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/107
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
81 words
A positive-acting light sensitive composition comprising: (a) a crosslinked urethane resin formed by a catalyzed crosslinking of a non-heat-reactive novalac phenolic resin with a polyisocyanate compound in an amount equal to 3 to 20 percent by weight of the novalac resin; (b) an epoxy resin having an epoxide equivalent weight of less than about 400 and a curing agent therefor; and (c) a positive-acting photosensitizer which when struck by radiation decomposes into a material which is more acidic than said photosensitizer.
Claim 2
Dependent Claim
81 words
A positive-acting light sensitive composition comprising: (a) a crosslinked urethane resin formed by a catalyzed crosslinking of a non-heat-reactive novalac phenolic resin with a polyisocyanate compound in an amount equal to 3 to 20 percent by weight of the novalac resin; (b) an epoxy resin having an epoxide equivalent weight of less than about 400 and a curing agent therefor; and (c) a positive-acting photosensitizer which when struck by radiation decomposes into a material which is more acidic than said photosensitizer.
Claim 3
Dependent Claim
81 words
The composition of claim 1 wherein said novalac resin comprises from about 40 to about 80 weight percent of said composition, said polyisocyanate concentration is from about 6 to about 12 parts by weight per 100 parts of said novalac resin, said epoxy resin concentration is from about 20 to about 40 parts by weight per 100 parts of said novalac resin, and said photosensitizer concentration is at least about 10 parts by weight per 100 parts of said novalac resin.
Claim 4
Dependent Claim
20 words
The composition of claim 2 wherein said novalac resin comprises from about 50 to 70 weight percent of said composition.
Claim 5
Dependent Claim
14 words
The composition of claim 1 wherein said novalac resin is a novalac phenolic/formaldehyde resin.
Claim 6
Dependent Claim
20 words
The composition of claim 4 wherein said novalac resin has a molecular weight of from about 500 to about 1000.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein said epoxy resin is a diglycidyl ether of bisphenol A.
Claim 8
Dependent Claim
23 words
The composition of claim 1 wherein said curing agent is selected from the group consisting of phthalic anhydride, diamino diphenylsulfone, and mixtures thereof.
Claim 9
Dependent Claim
91 words
A positive-acting light sensitive article comprising a substrate having coated on the surface thereof a light-sensitive composition comprising (a) a urethane resin formed by catalyzed crosslinking of a non-heat-reactive novalac phenolic resin with a polyisocyanate compound present in an amount equal to 3 to 20 percent by weight of said novalac resin; (b) a cured epoxy resin, said epoxy resin having an epoxide equivalent weight of less than about 400; and (c) a positive-acting photosensitizer which when struck by radiation decomposes into a material which is more acidic than said photosensitizer.
Claim 10
Dependent Claim
91 words
A positive-acting light sensitive article comprising a substrate having coated on the surface thereof a light-sensitive composition comprising (a) a urethane resin formed by catalyzed crosslinking of a non-heat-reactive novalac phenolic resin with a polyisocyanate compound present in an amount equal to 3 to 20 percent by weight of said novalac resin; (b) a cured epoxy resin, said epoxy resin having an epoxide equivalent weight of less than about 400; and (c) a positive-acting photosensitizer which when struck by radiation decomposes into a material which is more acidic than said photosensitizer.
Claim 11
Dependent Claim
81 words
The article of claim 8 wherein said novalac resin comprises from about 40 to about 80 weight percent of said composition, said polyisocyanate concentration is from about 6 to about 12 parts by weight per 100 parts of said novalac resin, said epoxy resin concentration is from about 20 to about 40 parts by weight per 100 parts of said novalac resin, and said photosensitizer concentration is at least about 10 parts by weight per 100 parts of said novalac resin.
Claim 12
Dependent Claim
19 words
The article of claim 9 wherein said novalac resin comprises from 50 to 70 weight percent of said composition.
Claim 13
Dependent Claim
14 words
The article of claim 8 wherein said novalac resin is a novalac phenolic/formaldehyde resin.
Claim 14
Dependent Claim
20 words
The article of claim 8 wherein said novalac resin has a molecular weight of from about 500 to about 1000.
Claim 15
Dependent Claim
16 words
The article of claim 8 wherein said epoxy resin is a diglycidyl ether of bisphenol A.
Claim 16
Dependent Claim
11 words
The article of claim 8 wherein said substrate is a polyester.
Claim 17
Dependent Claim
10 words
The article of claim 8 wherein said substrate is aluminum.
Claim 18
Dependent Claim
17 words
The article of claim 8 wherein said substrate comprises a flexible backing having a release coating thereon.
Claim 19
Dependent Claim
11 words
The article of claim 8 wherein said substrate is stainless steel.
Claim 20
Dependent Claim
18 words
The article of claim 8 wherein said polyisocyanate comprises a diisocyanate having from 10 to 50 carbon atoms.
Claim 21
Dependent Claim
21 words
The article of claim 8 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
Claim 22
Dependent Claim
21 words
The article of claim 9 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
Claim 23
Dependent Claim
21 words
The article of claim 18 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
Claim 24
Dependent Claim
21 words
The composition of claim 1 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
Claim 25
Dependent Claim
21 words
The composition of claim 2 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
Claim 26
Dependent Claim
21 words
The composition of claim 5 wherein said positive-acting photosensitizer is selected from the group consisting of diazo oxides and diazo sulfones.
References Cited (Backward Citations)
US3295974A
Cited
US3634082A
Cited
US3660097A
Cited
US3890152A
Cited
US3900325A
Cited
US3956043A
Cited
US4148654A
Cited
US4148655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |