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US 4,675,346 AGranted
UV curable silicone rubber compositions
AssigneeLoctite Corporation
InventorsSamuel Q. S. Lin, Steven T. Nakos
Life of this patent
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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.
Claims19
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.sup.1 is H or alkyl, the R.sup.2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups;
- the R.sup.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.
3 more elements
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.sup.1 is H or alkyl, the R.sup.2 groups are divalent hydrocarbon or hydrocarbonoxy groups, the R.sup.3 groups are the same or different alkyl, substituted alkyl, aryl, substituted aryl, alkoxy, or aryloxy groups;
- the R.sup.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.
3 more elements
Dependencies are inferred from the claim text.