Abstract: A curable silicone composition is provided. The curable silicone composition is useful for forming a cured product which inhibits the discoloration of silver electrodes or a silver-plated substrate in an optical semiconductor device due to a sulfur-containing gas. The curable silicone composition comprises at least one type of a crown compound. An optical semiconductor device is also provided. The optical semiconductor device has excellent reliability after a sulfur resistance test, in which an optical semiconductor device on silver electrodes or a silver-plated substrate is sealed, covered, or adhered with a cured product of the curable silicone composition.

Abstract: A curable organopolysiloxane composition that can be used as a sealant or a bonding agent for optical semiconductor elements is disclosed. The composition comprises: (A) an alkenyl-containing organopolysiloxane that comprises constituent (A-1) of an average compositional formula and constituent (A-2) of an average compositional formula; (B) an organopolysiloxane that contains silicon-bonded hydrogen atoms and comprises a constituent (B-1) containing at least 0.5 wt. % of silicon-bonded hydrogen atoms and represented by an average molecular formula, constituent (B-2) containing at least 0.5 wt. % of silicon-bonded hydrogen atoms and represented by an average compositional formula, and, optionally, constituent (B-3) of an average molecular formula; (C) an adhesion promoter; and (D) a hydrosilylation-reaction catalyst. The composition can form a cured body that possesses long-lasting properties of light transmittance and bondability, and relatively high hardness.

Abstract: A curable organopolysiloxane composition that can be used as a sealant or a bonding agent for optical semiconductor elements is disclosed. The composition comprises: (A) an alkenyl-containing organopolysiloxane that comprises constituent (A-1) of an average compositional formula and constituent (A-2) of an average compositional formula; (B) an organopolysiloxane that contains silicon-bonded hydrogen atoms and comprises a constituent (B-1) containing at least 0.5 wt. % of silicon-bonded hydrogen atoms and represented by an average molecular formula, constituent (B-2) containing at least 0.5 wt. % of silicon-bonded hydrogen atoms and represented by an average compositional formula, and, optionally, constituent (B-3) of an average molecular formula; (C) an adhesion promoter; and (D) a hydrosilylation-reaction catalyst. The composition can form a cured body that possesses long-lasting properties of light transmittance and bondability, and relatively high hardness.

Abstract: A curable silicone composition is provided. The curable silicone composition is useful for forming a cured product which inhibits the discoloration of silver electrodes or a silver-plated substrate in an optical semiconductor device due to a sulfur-containing gas. The curable silicone composition comprises at least one type of a crown compound. An optical semiconductor device is also provided. The optical semiconductor device has excellent reliability after a sulfur resistance test, in which an optical semiconductor device on silver electrodes or a silver-plated substrate is sealed, covered, or adhered with a cured product of the curable silicone composition.

Abstract: A photocurable silicone composition comprises: (A) an organopolysiloxane represented by the average composition formula: R1aR2bSiO(4-a-b)/2 where R1 is an alkenyl group having from 2 to 12 carbons, R2 is an alkyl group having from 1 to 12 carbons, an aryl group having from 6 to 12 carbons, or an aralkyl group having from 7 to 12 carbons; provided that, at least 30 mol % of R2 are the aryl groups or the aralkyl groups; and “a” and “b” are positive numbers satisfying: 1?(a+b)?2.5 and 0.001?a/(a+b)?0.2; (B) an organic compound having at least two ether bonds and at least one aliphatic carbon-carbon double bond in a molecule; (C) a compound having at least two thiol groups in a molecule; (D) a photoradical initiator having a phosphorus atom; and (E) a hindered phenol compound.

Abstract: A photocurable silicone composition comprises: (A) an organopolysiloxane represented by the average composition formula: R1aR2bSiO(4-a-b)/2 where R1 is an alkenyl group having from 2 to 12 carbons, R2 is an alkyl group having from 1 to 12 carbons, an aryl group having from 6 to 12 carbons, or an aralkyl group having from 7 to 12 carbons; provided that, at least 30 mol % of R2 are the aryl groups or the aralkyl groups; and “a” and “b” are positive numbers satisfying: 1?(a+b)?2.5 and 0.001?a/(a+b)?0.2; (B) an organic compound having at least two ether bonds and at least one aliphatic carbon-carbon double bond in a molecule; (C) a compound having at least two thiol groups in a molecule; (D) a photoradical initiator having a phosphorus atom; and (E) a hindered phenol compound.

Abstract: This invention relates to a reactive silicone composition for forming a hotmelt material, comprising: (A) an organopolysiloxane resin represented by the specific average unit formula; (B) an organopolysiloxane resin free of alkenyl group and represented by the specific average unit formula; (C) a diorganopolysiloxane represented by the specific average formula; (D) an organohydrogenpolysiloxane having two silicon-bonded hydrogen atoms in a molecule; (E) an organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms in a molecule; and (F) a hydrosilylation catalyst. The reactive silicone composition can be reacted to form a hotmelt material having excellent shelf life stability, instant adhesion performance by hotmelt process.

Abstract: This invention relates to a reactive silicone composition for forming a hotmelt material, comprising: (A) an organopolysiloxane resin represented by the specific average unit formula; (B) an organopolysiloxane resin free of alkenyl group and represented by the specific average unit formula; (C) a diorganopolysiloxane represented by the specific average formula; (D) an organohydrogenpolysiloxane having two silicon-bonded hydrogen atoms in a molecule; (E) an organohydrogenpolysiloxane having at least three silicon-bonded hydrogen atoms in a molecule; and (F) a hydrosilylation catalyst. The reactive silicone composition can be reacted to form a hotmelt material having excellent shelf life stability, instant adhesion performance by hotmelt process.

Abstract: Provided are a gas barrier film that is simply and economically manufactured, and has high hardness and strength, excellent gas blocking properties, controllable refraction index and transparency, and a compositionally gradient structure, and a method of producing the same. The gas barrier film includes a base material; and an organic/inorganic hybrid gas barrier layer that is formed on the base material and has a composition-gradient structure. The organic/inorganic hybrid gas barrier layer has a network structure having —O—Si—O— linkages. The network structure contains an organic functional group having a carbon atom directly linked to a silicon atom of the —O—Si—O— linkages, and other element that exists in an oxide form in the interstitial location of the network structure or that is linked to an oxygen atom of the —O—Si—O— linkages, wherein the other element comprises at least one selected from alkali metal, alkaline earth metal, transition metal, post transition metal, metalloid, boron, and phosphorous.