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US5017406A
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UV curable compositions cured with polysilane and peroxide initiators
Assignee: Dow Silicones Corp
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Filing: 1988-12-08
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Granted: 1991-05-21
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Expires: 2008-12-08
Abstract
Abstract UV curable compositions suitable for use as potting and encapsulating compounds for electrical and electronic devices are provided. The compositions comprise: (a) a UV curable compound polymerizable by a free radical process and containing reactive unsaturated groups, (b) a polysilane photoinitiator, and (c) a peroxide photoinitiator. The use of the two photoinitiators enables one to get a more complete cure, both at the surface and deep into the coating.
Inventors
- 👤 Michael A. Lutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:30
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
111 words
An improved composition comprising (a) a UV curable compound polymerizable by a free radical process and containing reactive unsaturated groups selected from the group consisting of acrylics, methacrylics, styrenics, acrylamides, acrylonitriles, vinyl acetates, alkynes, and alkenes, (b) a polysilane photoinitiator selected from the group consisting of (RR'Si) x , Me(Me 2 Si) x , and Me(PhMeSi) x Me in which R and R' are independently selected from aliphatic and aromatic radicals, x is an integer of from 4 to 7, Me is methyl, and Ph is phenyl, and (c) a peroxide photoinitiator selected from the group consisting of dibenzoyl peroxide, cumene hydroperoxide, di-t-butyl peroxide, diacetyl peroxide, hydrogen peroxide, peroxydisulfates, and 2,2-bis(terbutylperoxy)-2,5-dimethylhexane.
Claim 2
Dependent Claim
111 words
An improved composition comprising (a) a UV curable compound polymerizable by a free radical process and containing reactive unsaturated groups selected from the group consisting of acrylics, methacrylics, styrenics, acrylamides, acrylonitriles, vinyl acetates, alkynes, and alkenes, (b) a polysilane photoinitiator selected from the group consisting of (RR'Si) x , Me(Me 2 Si) x , and Me(PhMeSi) x Me in which R and R' are independently selected from aliphatic and aromatic radicals, x is an integer of from 4 to 7, Me is methyl, and Ph is phenyl, and (c) a peroxide photoinitiator selected from the group consisting of dibenzoyl peroxide, cumene hydroperoxide, di-t-butyl peroxide, diacetyl peroxide, hydrogen peroxide, peroxydisulfates, and 2,2-bis(terbutylperoxy)-2,5-dimethylhexane.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the UV curable compound is a vinyl functional polysiloxane.
Claim 4
Dependent Claim
34 words
The composition of claim 2, wherein the vinyl functional polysiloxane has the average structural formula (MeSiO.sub.3/2).sub.3 (Me.sub.2 SiO).sub.95 (Me.sub.3 SiO.sub.1/2).sub.1.3 (ViMe.sub.2 SiO.sub.1/2).sub.0.7 in which formula Me and Vi represent methyl and vinyl radicals, respectively.
Claim 5
Dependent Claim
38 words
The composition of claim 2, wherein the vinyl functional polysiloxane has the average structural formula ViMe 2 SiO(Me 2 SiO) 145 (ViMeSiO) 3 SiMe 2 Vi in which formula Me and Vi represent methyl and vinyl radicals, respectively.
Claim 6
Dependent Claim
37 words
The composition of claim 1, wherein the polysilane comprises a polysilane of the structure, (RR'Si).sub.x wherein R and R' are independently selected from aliphatic and aromatic radicals, and x is an integer of from 4 through 7.
Claim 7
Dependent Claim
22 words
The composition of claim 5, wherein the polysilane consists essentially of (Me 2 Si) 6 , and Me represents the methyl radical.
Claim 8
Dependent Claim
37 words
The composition of claim 2, wherein the polysilane comprises a polysilane of the structure, (RR'Si).sub.x wherein R and R' are independently selected from aliphatic and aromatic radicals, and x is an integer of from 4 through 7.
Claim 9
Dependent Claim
22 words
The composition of claim 7, wherein the polysilane consists essentially of (Me 2 Si) 6 , and Me represents the methyl radical.
Claim 10
Independent Claim
129 words
A method of coating a substrate which comprises applying to said substrate, a composition comprising (a) a UV curable compound polymerizable by a free radical process and containing reactive unsaturated groups selected from the group consisting of acrylics, methacrylics, styrenics, acrylamides, acrylonitriles, vinyl acetates, alkynes, and alkenes, (b) a polysilane photoinitiator selected from the group consisting of (RR'Si) x , Me(Me 2 Si) x , and Me(PhMeSi) x Me in which R and R' are independently selected from aliphatic and aromatic radicals, x is an integer of from 4 to 7, Me is methyl, and Ph is phenyl, and (c) a peroxide photoinitiator selected from the group consisting of dibenzoyl peroxide, cumene hydroperoxide, di-t-butyl peroxide, diacetyl peroxide, hydrogen peroxide, peroxydisulfates, and 2,2-bis(terbutylperoxy)-2,5-dimethylhexane, and curing said composition with UV radiation.
Claim 11
Independent Claim
129 words
A method of coating a substrate which comprises applying to said substrate, a composition comprising (a) a UV curable compound polymerizable by a free radical process and containing reactive unsaturated groups selected from the group consisting of acrylics, methacrylics, styrenics, acrylamides, acrylonitriles, vinyl acetates, alkynes, and alkenes, (b) a polysilane photoinitiator selected from the group consisting of (RR'Si) x , Me(Me 2 Si) x , and Me(PhMeSi) x Me in which R and R' are independently selected from aliphatic and aromatic radicals, x is an integer of from 4 to 7, Me is methyl, and Ph is phenyl, and (c) a peroxide photoinitiator selected from the group consisting of dibenzoyl peroxide, cumene hydroperoxide, di-t-butyl peroxide, diacetyl peroxide, hydrogen peroxide, peroxydisulfates, and 2,2-bis(terbutylperoxy)-2,5-dimethylhexane, and curing said composition with UV radiation.
Claim 12
Dependent Claim
15 words
The method of claim 9, wherein the substrate coated is an electrical or electronic device.
Claim 13
Dependent Claim
13 words
The method of claim 9, wherein the composition is also cured with heat.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |