Patent US4787973A successfully refreshed from Google Patents.
Patent US4675346A successfully refreshed from Google Patents.
US4675346A
Expired / Lapsed
US
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UV curable silicone rubber compositions
Assignee: LOCITE Corp
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Filing: 1984-01-16
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Granted: 1987-06-23
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Expires: 2004-01-16
Abstract
Abstract Compositions of (a) a silicone resin characterized by an intermediate region free of acrylic groups, at least 150 siloxane units long, and terminal acrylic groups; (b) at least 10% of a fumed silica filler; and (c) a photoinitiator, can be cured by UV irradiation to tough elastomeric materials useful in adhesive and sealant applications.
Inventors
- 👤 Samuel Q. S. Lin
- 👤 Steven T. Nakos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:07
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0025; C08F; C08F2/00; C08F2/46; C08F2/48; C08F2/50; C08F299/00; C08F299/02; C08F299/08; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/38; C08J; C08J3/00; C08J3/24; C08J3/243; C08K3/00; C08K3/34; C08K3/36; C09; C09J; C09J183/00; C09J183/04; C09J183/06; H; H05; H05K; H05K3/00; H05K3/22; H05K3/28; H05K3/285; C08J2383/00; C08J2383/04; C08L; C08L2666/00; C08L2666/28; C08L2666/54
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
107 words
A silicone composition curable by UV irradiation to an elastomer comprising: (a) At least 56% by weight of a silicone resin or mixture of silicone resins represented by the formula: ##STR4## where R 1 is H or alkyl, the R 2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R 3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups; the R 4 groups are the same or different alkyl, halo substituted alkyl, or aryl groups and n is an integer between about 150 and 700; (b) At least about 10% of a fumed silica filler; and (c) A photoinitiator.
Claim 2
Dependent Claim
107 words
A silicone composition curable by UV irradiation to an elastomer comprising: (a) At least 56% by weight of a silicone resin or mixture of silicone resins represented by the formula: ##STR4## where R 1 is H or alkyl, the R 2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R 3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups; the R 4 groups are the same or different alkyl, halo substituted alkyl, or aryl groups and n is an integer between about 150 and 700; (b) At least about 10% of a fumed silica filler; and (c) A photoinitiator.
Claim 3
Dependent Claim
14 words
A composition as in claim 1 wherein the R 4 groups are all methyl.
Claim 4
Dependent Claim
15 words
A composition as in claim 1 wherein said fumed silica filler is a hydrophobic silica.
Claim 5
Dependent Claim
23 words
A composition as in claim 1 wherein said fumed silica filler is present at a level of about 20% or more by weight.
Claim 6
Dependent Claim
18 words
A composition as in claim 4 wherein said fumed silica filler is a dimethyldichlorosilane or hexamethyldisilazane treated silica.
Claim 7
Dependent Claim
29 words
A composition as in claim 1 curable to an elastomer characterized by a tensile strength of at least 200 psi and a Shore A hardness of at least 20.
Claim 8
Dependent Claim
21 words
A composition as in claim 6 further characterized by a tear resistance of the cured elastomer in excess of 125 lb./in.
Claim 9
Dependent Claim
17 words
A composition as in claim 7 wherein the cured elastomer tear resistance is 170 lb./in. or more.
Claim 10
Dependent Claim
18 words
A composition as in claim 1 wherein the photoinitiator is present in the range of 0.1%-5% by weight.
Claim 11
Dependent Claim
20 words
A composition as in claim 1 wherein the photoinitiator is selected from benzoin, substituted benzoins, benzophenone, Michler's Ketone, and dialkoxyacetophenones.
Claim 12
Dependent Claim
12 words
A composition as in claim 1 wherein the photoinitiator is polymer bound.
Claim 13
Dependent Claim
22 words
A composition as in claim 1 wherein R 1 is H or CH 3 , and R 2 is propylene or propenylene.
Claim 14
Dependent Claim
14 words
A composition as in claim 12 wherein R 3 and R 4 are methyl.
Claim 15
Dependent Claim
7 words
A cured composition as in claim 1.
Claim 16
Dependent Claim
7 words
A cured composition as in claim 4.
Claim 17
Dependent Claim
7 words
A cured composition as in claim 6.
Claim 18
Dependent Claim
7 words
A cured composition as in claim 7.
Claim 19
Dependent Claim
7 words
A cured composition as in claim 13.
Claim 20
Dependent Claim
105 words
A silicone composition curable to an elastomer comprising: (a) At least 56% by weight of a silicone resin or mixture of resins represented by the formula: ##STR5## where R 1 is H or alkyl, the R 2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R 3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups; the R 4 groups are the same or different alkyl, halo substituted alkyl, or aryl groups and n is an integer between about 150 and 700; (b) At least about 10% of a fumed silica filler; and (c) A free radical initiator.
Claim 21
Dependent Claim
105 words
A silicone composition curable to an elastomer comprising: (a) At least 56% by weight of a silicone resin or mixture of resins represented by the formula: ##STR5## where R 1 is H or alkyl, the R 2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R 3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups; the R 4 groups are the same or different alkyl, halo substituted alkyl, or aryl groups and n is an integer between about 150 and 700; (b) At least about 10% of a fumed silica filler; and (c) A free radical initiator.
References Cited (Backward Citations)
US4158617A
Cited
US4227979A
Cited
US4201808A
Cited
GB2039287A
Cited
US4293397A
Cited
US4364809A
Cited
US4348454A
Cited
US4477326A
Cited
US4504629A
Cited
US4528081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |