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US 8,940,851 B2Granted
Highly transparent silicone mixtures that can be cross-linked by light
AssigneeWacker Chemie AG
InventorPhilipp Mueller
Life of this patent
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Abstract
Silicone fibers suitable for use as optical fibers are prepared by crosslinking an extruded mixture of a silicone resin and an organopolysiloxane, both containing aliphatically unsaturated groups, an organopolysiloxane bearing Si—H groups, and a light activatable trimethyl(methylcyclopentadienyl) platinum catalyst.
Claims19
A transparent silicone mixture crosslinkable under the influence of light, comprising
- (A) at least one organosiloxane resin comprising units of the formulae I, II, III and IV
- R3SiO1/2 (I),
- R2SiO2/2 (II),
- RSiO3/2 (III),
- SiO4/2 (IV),
- in which
- R are saturated hydrocarbyl radicals optionally substituted by halogens, and having 1-40 carbon atoms, —OH, or a C1-10 alkenyl radical
- with the proviso that
- at least 20 mol % of the units are selected from units of the general formulae III and IV,
- at least 2 of the R radicals are alkenyl radicals having 1-10 carbon atoms and
- at most 2% by weight of the R radicals are —OH radicals,
- (B) at least one polyorganosiloxane containing at least two alkenyl groups per molecule and having a chain length of the longest chain of 200 to 10,000 siloxy units, in an amount of from 10 to 90 parts by weight per 100 parts of organosiloxane resin (A),
- (C) at least one organosilicon compound containing at least two SiH functions per molecule and
- (D) as one catalyst, MeCp(PtMe3) activatable by light from 200 to 500 nm.
11 more elements
A transparent silicone mixture crosslinkable under the influence of light, comprising
- (A) at least one organosiloxane resin comprising units of the formulae I, II, III and IV
- R3SiO1/2 (I),
- R2SiO2/2 (II),
- RSiO3/2 (III),
- SiO4/2 (IV),
- in which
- R are saturated hydrocarbyl radicals optionally substituted by halogens, and having 1-40 carbon atoms, —OH, or a C1-10 alkenyl radical with the proviso that at least 20 mol % of the units are selected from units of the general formulae III and IV,
- at least 2 of the R radicals are alkenyl radicals having 1-10 carbon atoms and
- at most 2% by weight of the R radicals are —OH radicals,
- (B) at least one polyorganosiloxane containing at least two alkenyl groups per molecule and having a chain length of the longest chain of 200 to 10,000 siloxy units,
- (C) at least one organosilicon compound containing at least two SiH functions per molecule and
- (D) as one catalyst, MeCp(PtMe3) activatable by light from 200 to 500 nm,
- wherein the transparent silicone composition has a viscosity of ≧1000 Pa·s measured at 25° C.
10 more elements
Dependencies are inferred from the claim text.