EP0152179A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
UV curable silicone rubber compositions
Assignee: Henkel Loctite Corp
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Filing: 1985-01-15
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Granted: —
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Expires: 2005-01-15
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
EP
Data Source
google_patents
Last Synchronized
2026-11-03 06:21
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: 12
Claim 1
Independent Claim
69 words
A silicone composition curable to an elastomer characterized by comprising: (a) a silicone resin having an average linear molecular size of at least about 150 siloxane units which is characterized by terminal acrylic groups and an intermediate region free of acrylic groups, said acrylic groups having the formula: where R 1 is H or alkyl; (b) at least about 10% of a fumed silica filler; and (c) a photoinitiator.
Claim 2
Dependent Claim
69 words
A silicone composition curable to an elastomer characterized by comprising: (a) a silicone resin having an average linear molecular size of at least about 150 siloxane units which is characterized by terminal acrylic groups and an intermediate region free of acrylic groups, said acrylic groups having the formula: where R 1 is H or alkyl; (b) at least about 10% of a fumed silica filler; and (c) a photoinitiator.
Claim 3
Dependent Claim
30 words
A composition as in claim 1, characterized in that said silicone resin comprises at least one acrylic group capped linear polydimethylsiloxane having a molecular weight between about 12,000 and 50,000.
Claim 4
Dependent Claim
92 words
A composition as in claim 1, characterized in that said silicone is represented by the formula wherein R 1 is H or alkyl, preferably CH 3 , the R 2 groups are divalent hydrocarbon or hydrocarbonoxy groups preferably propylene or propenylene, the R 3 groups are the same or different alkyl, preferably methyl, substituted alkyl, aryl, substituted aryl, alkoxy, aryloxy or acrylic groups; the R 4 groups are the same or different alkyl, preferably methyl, substituted alkyl, aryl or substituted aryl groups, and n is an integer between about 150 and 700.
Claim 5
Dependent Claim
58 words
A composition as in any of claims 1 to 3, characterized by one or more of the following features: (a) said fumed silica filler is a hydrophobic silica; (b) said fumed silica filler is a dimethyldichlorosilane or hexamethyldisilazane treated silica; and (c) said fumed silica filler is present at a level of about 20% or more by weight.
Claim 6
Dependent Claim
52 words
A composition as in any of claims 1 to 4, characterized by one or more of the following features: (a) said photoinitiator is polymer bound; (b) said photoinitiator is selected from benzoin, substituted benzoins, benzophenone, Michler's Ketone, and dialkoxyacetophenones; and (c) said photoinitiator is present in the range of 0.1%-5% by weight.
Claim 7
Dependent Claim
29 words
b. A composition as in any of claims 1 to 5, characterized by further comprising up to 30%, based on total silicone resin weight, of a nonacrylic silicone resin.
Claim 8
Dependent Claim
32 words
A composition as in any of claims 1 to 6, curable to an elastomer characterized by a tensile strength of at least 200 psi and a Shore hardness of at least 20.
Claim 9
Dependent Claim
28 words
A composition as in claim 7, further characterized in that the tear resistance of the cured elastomer is in excess of 125 lb./in., preferably 170 Ib./in. or more.
Claim 10
Dependent Claim
70 words
A silicone composition curable to an elastomer characterized by comprising: (a) a silicone resin having an average linear molecular size of at least about 150 siloxane units which is characterized by terminal acrylic groups and an intermediate region free of acrylic groups, said acrylic groups having the formula: where R is H or alkyl; (b) at least about 10% of a fumed silica filler; and (c) a free radical initiator.
Claim 11
Dependent Claim
70 words
A silicone composition curable to an elastomer characterized by comprising: (a) a silicone resin having an average linear molecular size of at least about 150 siloxane units which is characterized by terminal acrylic groups and an intermediate region free of acrylic groups, said acrylic groups having the formula: where R is H or alkyl; (b) at least about 10% of a fumed silica filler; and (c) a free radical initiator.
Claim 12
Dependent Claim
17 words
Cured elastomeric products produced from the silicone compositions as claimed in any of claims 1 to 9.
References Cited (Backward Citations)
No citation records indexed.
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