Patent US5397685A successfully refreshed from Google Patents.
US5397685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive composition and process
Assignee: Shipley Co Inc
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Filing: 1993-11-26
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Granted: 1995-03-14
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Expires: 2013-11-26
Abstract
Abstract A photoimageable composition and process for use of the same. The composition comprises a binder that is a mixture of a phenolic resin and a multifunctional epoxy or vinyl compound and a curing system comprising a photoactive compound capable of generating a curing catalyst capable of crosslinking the binder components. The process for use of the composition comprises application of the composition to a substrate, drying of the same, exposing the dried coating to activating radiation, curing the binder in light exposed areas, developing the coating and thermally curing the developed image. The composition is especially useful as a solder mask.
Inventors
- 👤 George R. E. Daniels
- 👤 Michael J. Oddi
- 👤 Kevin J. Cheetham
- 👤 Stephen S. Rodriguez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:21
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; H05K3/287; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
210 words
A method for forming an imaged film over a substrate, said method comprising the steps of: a. coating said substrate with a composition comprising a binder and a curing system for components of said binder, said binder comprising an admixture of a phenolic resin and a compound having at least two reactive functionalities selected from the group of an epoxy radical, a vinyl ether radical and a mixture of an epoxy and a vinyl ether radical, and said curing system comprising a crosslinking agent for the phenolic resin and a photoactive compound capable of generating a curing catalyst for said binder, said phenolic resin being present in an amount sufficient to render unexposed portions of the composition alkali soluble, said compound having at least two reactive functionalities being present in an amount capable of hardening said composition and said curing system being present in an amount capable of curing the components of the binder upon exposure to activating ratdiation and baking before development; b. exposing at least a portion of said coating to activating radiation to generate said curing catalyst in exposed portions of said coating; c. curing said exposed portions of said coating by baking the same; and d. developing said coating by contact with an aqueous based developer.
Claim 2
Independent Claim
210 words
A method for forming an imaged film over a substrate, said method comprising the steps of: a. coating said substrate with a composition comprising a binder and a curing system for components of said binder, said binder comprising an admixture of a phenolic resin and a compound having at least two reactive functionalities selected from the group of an epoxy radical, a vinyl ether radical and a mixture of an epoxy and a vinyl ether radical, and said curing system comprising a crosslinking agent for the phenolic resin and a photoactive compound capable of generating a curing catalyst for said binder, said phenolic resin being present in an amount sufficient to render unexposed portions of the composition alkali soluble, said compound having at least two reactive functionalities being present in an amount capable of hardening said composition and said curing system being present in an amount capable of curing the components of the binder upon exposure to activating ratdiation and baking before development; b. exposing at least a portion of said coating to activating radiation to generate said curing catalyst in exposed portions of said coating; c. curing said exposed portions of said coating by baking the same; and d. developing said coating by contact with an aqueous based developer.
Claim 3
Dependent Claim
77 words
The method of claim 1 where the phenolic resin is selected from the group consisting of a novolak resin and a polyvinyl phenol, the compound having the reactive functionality is an epoxy resin, and the curing system is an onium salt and an acid activated crosslinking agent for the phenolic resin, each being present in a concentration in parts by weight as follows: ______________________________________
phenolic resin 25-65
epoxy resin 15-50
crosslinking agent
5-35
onium salt 1-15.
______________________________________
Claim 4
Dependent Claim
32 words
The method of claim 2 where said components are present in the following amounts in parts by weight: ______________________________________
phenolic resin 40-50
epoxy resin 25-35
crosslinking agent
1-20
onium salt 2-10.
______________________________________
Claim 5
Dependent Claim
13 words
The method of claim 2 where said crosslinking agent is a melamine resin.
Claim 6
Dependent Claim
11 words
The method of claim 4 where the melamine resin is hexamethoxymethylmelamine.
Claim 7
Dependent Claim
13 words
The method of claim 2 where said onium salt is a sulfonium compound.
Claim 8
Dependent Claim
35 words
The method of claim 2 where the composition is applied as a liquid coating composition and the concentration of solids in solution varies between about 10 and 50 percent by weight of the total composition.
Claim 9
Dependent Claim
14 words
The method of claim 2 where the composition is applied as a dry film.
Claim 10
Dependent Claim
26 words
The method of claim 2 where the step of curing prior to development is by heating to a temperature of between about 85° and 120° C.
Claim 11
Dependent Claim
26 words
The method of claim 2 including a post development thermal cure by heating the developed coating to a temperature of between about 120° and 160° C.
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) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |