US4278752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant radiation sensitive element
Assignee: EIDP Inc
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Filing: 1980-02-14
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Granted: 1981-07-14
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Expires: 2000-02-14
Abstract
Abstract A radiation sensitive element comprising a support bearing a layer of photopolymerizable composition which comprises (1) at least one addition polymerizable ethylenically unsaturated compound, (2) an initiator activatable in the ultraviolet to visible region of the spectrum, and (3) at least 20% by weight of a polymeric binder containing at least 5% by weight of acrylonitrile, the composition having present at least 5% by weight halogen based on the total weight of composition covalently bonded to an aromatic moiety of at least one of said components of the composition and/or a conjugated vinyl component. The elements withstand soldering and are flame retardant and are useful as solder masks.
Inventors
- 👤 Joseph E. Gervay
- 👤 Yvan P. Pilette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:25
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; H05K3/287; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/033; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
188 words
In a solvent-developable radiation-sensitive solder mask element having a support bearing a layer of photopolymerizable composition useful as a permanent coating for a printed circuit, which comprises (a) at least one addition polymerizable ethylenically unsaturated compound having a boiling point above 100° C. at normal pressure, (b) an organic free radical-generating addition polymerization initiator activatable by actinic radiation in the ultraviolet-to-visible region of the spectrum and (c) at least 20% by weight of a macromolecular organic polymeric binder, based on the total weight of the composition, the improvement for the purpose of rendering the composition flame retardant and resistant to molten solder without blistering or degradiation of the photopolymerizable layer upon polymerization which comprises (1) utilizing as the binder component a macromolecular organic polymer containing at least 5% by weight acrylonitrile monomeric units and (2) incorporating halogen by covalent bonding to at least component (a) of the photopolymerizable composition, the weight percent of covalently bonded halogen based on the total weight of the composition being at least 5 weight percent, with the proviso that the covalent halogen bond is to an aromatic moiety or a conjugated vinyl component.
Claim 2
Dependent Claim
188 words
In a solvent-developable radiation-sensitive solder mask element having a support bearing a layer of photopolymerizable composition useful as a permanent coating for a printed circuit, which comprises (a) at least one addition polymerizable ethylenically unsaturated compound having a boiling point above 100° C. at normal pressure, (b) an organic free radical-generating addition polymerization initiator activatable by actinic radiation in the ultraviolet-to-visible region of the spectrum and (c) at least 20% by weight of a macromolecular organic polymeric binder, based on the total weight of the composition, the improvement for the purpose of rendering the composition flame retardant and resistant to molten solder without blistering or degradiation of the photopolymerizable layer upon polymerization which comprises (1) utilizing as the binder component a macromolecular organic polymer containing at least 5% by weight acrylonitrile monomeric units and (2) incorporating halogen by covalent bonding to at least component (a) of the photopolymerizable composition, the weight percent of covalently bonded halogen based on the total weight of the composition being at least 5 weight percent, with the proviso that the covalent halogen bond is to an aromatic moiety or a conjugated vinyl component.
Claim 3
Dependent Claim
19 words
An element according to claim 1 wherein any of said unsaturated compound (a) is at least a difunctional compound.
Claim 4
Dependent Claim
18 words
An element according to claim 1 wherein the halogen is covalently bonded solely to said unsaturated compound (a).
Claim 5
Dependent Claim
21 words
The element according to claim 3 wherein said halogen is covalently bonded to an aromatic moiety of said unsaturated compound (a).
Claim 6
Dependent Claim
21 words
An element according to claim 3 wherein the halogenated unsaturated compound is present together with at least one other unsaturated compound.
Claim 7
Dependent Claim
22 words
An element according to claim 1 wherein a portion of said halogen is covalently bonded to an aromatic moiety of said initiator.
Claim 8
Dependent Claim
13 words
An element according to claim 1 wherein said polymeric binder compound is nonhalogenated.
Claim 9
Dependent Claim
15 words
An element according to claim 1 wherein at least one ethylenically unsaturated compound is nonhalogenated.
Claim 10
Dependent Claim
61 words
An element according to claim 1 wherein said photopolymerizable composition comprises 20 to 65% by weight of up to four ethylenically unsaturated compounds; 20 to 35% by weight of up to three macromolecular organic polymeric binders; and 0.4 to 10.0% by weight of an organic, free-radical generating addition polymerization initiator, all weight percentages being based on the total weight of composition.
Claim 11
Dependent Claim
20 words
An element according to claim 9 wherein 10 to 50% by weight of the ethylenically unsaturated compounds are halogenated compounds.
Claim 12
Dependent Claim
24 words
An element according to claims 5, 7 or 9 wherein the composition contains up to 10% by weight of Sb 2 O 3 .
Claim 13
Dependent Claim
17 words
An element according to claim 1 wherein a strippable cover sheet is present on said photopolymerizable layer.
Claim 14
Dependent Claim
24 words
An element according to claim 1 wherein at least one of said halogenated unsaturated compounds (a) is a di(acryloxy)ether of tetrachloro or tetrabromo bisphenol-A.
Claim 15
Dependent Claim
12 words
An element according to claim 1 wherein a binder present is polybromostyrene.
Claim 16
Dependent Claim
19 words
An element according to claim 1 wherein at least one of said covalently bonded halogen compounds is a 2-chlorobutadiene-1,3-polymer.
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) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |