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US 10,294,352 B2Granted
Curable, highly transparent silicone composition with improved mechanics, for optical components
AssigneeWacker Chemie AG
InventorsArvid Kuhn, Inge Schreiber
Life of this patent
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Abstract
Cast silicone compositions with high transparency suitable for use as optical components contain a base polymer with a refractive index ≥1.42, and a reinforcing particulate silica which is surface modified to have a refractive index within 0.03 of the refractive index of the base polymer, by reaction with an aryl-silane or aryl-siloxane.
Claims15
In a process wherein a casting compound is used in the manufacture of an optical component, the improvement comprising casting, employing as a casting compound, an addition-crosslinking silicone composition comprising:
- (A) at least one linear compound comprising radicals having aliphatic carbon-carbon multiple bonds,
- (B) at least one linear organopolysiloxane having Si-bonded hydrogen atoms, or, instead of (A) and (B),
- (C) at least one linear organopolysiloxane comprising SiC-bonded radicals having aliphatic carbon-carbon multiple bonds, and Si-bonded hydrogen atoms,
- wherein the refractive index nD25 of (A) and (C) is at least 1.48,
- (D) at least one hydrosilylation catalyst,
- (E) at least one reinforcing filler comprising fumed silica having a BET surface area of 100-400 m2/g, surface modified to have a refractive index nD25 differing by at most 0.03 from (A) and/or (C), by reacting with an aryl-silane prior to compounding with other ingredients of the addition-crosslinking silicone composition.
3 more elements
Dependencies are inferred from the claim text.