摘要:
The present invention provides a hydrosilylation curable silicone composition 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 in the air, and for sealing, covering, or adhering an optical semiconductor element, the curable silicone composition comprising: (A) an organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule; (B) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms per molecule; (C) a tetrazole-based compound; and (D) a hydrosilylation reaction catalyst. In addition, the present invention provides an optical semiconductor device in which an optical semiconductor element is sealed, covered, or adhered by the cured product of the composition so that the discoloration of silver electrodes or a silver-plated substrate due to a sulfur-containing gas in the air is inhibited.
摘要:
The present invention relates to a curable silicone composition comprising: (A) an organopolysiloxane represented by a specific average unit formula and having at least two alkenyl groups in a molecule, (B) an optional straight-chain organopolysiloxane having at least two alkenyl groups and not having any silicon-bonded hydrogen atoms in a molecule, (C) an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, wherein at least 80 mass % of this component comprises an organotrisiloxane represented by the formula: H(CH3)2SiO(C6H5)2SiOSi(CH3)2H, and (D) a hydrosilylation reaction catalyst. The curable silicone composition has excellent handleability and high reactivity and forms a cured product with low gas permeability.
摘要:
A solvent-type curable organopolysiloxane composition comprising (A) at least one type of gum-like or liquid organopolysiloxane having a viscosity of not less than 20 mPA·s, a content of the vinyl(CH2═CH—) part of higher alkenyl groups being in a range of 2.0 to 5.0% by mass; (B) an organopolysiloxane having a viscosity of not less than 1,000,000 mPa·s, a content of the vinyl(CH2═CH—) part of alkenyl groups being less than 0.1% by mass; (C) an organohydrogenpolysiloxane; (D) a hydrosilylation reaction catalyst; and (E) an organic solvent. In such a composition, a mass ratio of the component (A) to the component (B) is in a range of 2/8 to 8/2.
摘要:
An anti-foaming agent containing (A) an organopolysiloxane and a finely powdered inorganic filler, (B) a polyoxyalkylene group-containing branched chain organopolysiloxane, and (C) an anionic surfactant. This anti-foaming agent exhibits stable anti-foaming performance even at high temperatures that reach, for example, 80 QC or under strongly alkaline conditions and produces no aggregates.
摘要:
A copolymer comprising: (A) an unsaturated monomer having a carbosiloxane dendrimer structure; and (B) an unsaturated monomer having at least one hydrophilic group in the molecule is disclosed. A content of the unsaturated monomer having the carbosiloxane dendrimer structure is in the range of 35 to 50% by mass of the total monomer units of the copolymer. The present invention is also a liquid composition, surface treatment agent, and powder composition including the copolymer, as well as a cosmetic raw material containing such components.
摘要:
A copolymer in which from 45 to 60% by mass of all monomer units are unsaturated monomers having a specific carbosiloxane dendrimer structure is disclosed, along with a composition, a cosmetic raw material, and a cosmetic containing the copolymer. The copolymer has excellent physical properties, including compatibility with other cosmetic raw materials, e.g. hardly soluble ultraviolet absorbers, and is capable of improving the compounding stability of cosmetics. The copolymer imparts cosmetics with good water resistance, sebum resistance, luster, tactile sensation, and adhesiveness to the hair or skin.
摘要:
A curable silicone composition comprises: (A) an organopolysiloxane represented by an average unit formula; (B) an organopolysiloxane having 10 or less silicon atoms, wherein 30 to 60 mole % of all silicon atom-bonded organic groups are alkenyl groups having from 2 to 6 carbons; (C) an organopolysiloxane represented by a general formula; (D) an organopolysiloxane having at least 2 silicon atom-bonded hydrogen atoms in a molecule, wherein the content of phenyl groups in all silicon atom-bonded organic groups in this component is 20 to 70 mole %; (E) an organopolysiloxane represented by an average unit formula; (F) a hydrosilylation reaction catalyst; (G) a white pigment; and (H) an inorganic filler other than a white pigment, has excellent formability for forming a cured product that has little discoloration and lowering of mechanical strength by heat and light, has high light reflectance, has excellent dimensional stability, and is capable of good attachment by a sealing agent used for an optical semiconductor device.
摘要:
A liquid organopolysiloxane having fluidity at least 100° C., a silicon-bonded glycerin derivative group, and a crosslinked structure comprising a carbon-silicon bond at the crosslinking portion.
摘要:
The present invention has an objective to provide a surface treatment agent which is safe with no generation of hydrogen, can be suitably used in a surface treatment of powder(s), exhibits good compatibility with other raw materials of cosmetics, and therefore, can improve a dispersing property and stability of powder(s) contained in a cosmetic, as well as provide a powder which has been subjected to a surface treatment with the aforementioned powder treatment agent, and a cosmetic raw material and a cosmetic which are produced by blending them, exhibit superior storage stability, have a superior outer appearance, and exhibit a superior sensation during use. A sugar alcohol-modified organopolysiloxane having a specified structure is used in the powder treatment.
摘要:
A multi-component room-temperature-curable silicone elastomer composition comprises (A) a diorganopolysiloxane including (A-1) a diorganopolysiloxane capped at both molecular terminals with alkoxysilyl groups or hydroxysilyl groups and (A-2) a diorganopolysiloxane capped at only one molecular terminal by an alkoxysilyl group or a hydroxysilyl group and at the other molecular terminal with an alkyl group or an alkenyl group, having a viscosity at 25° C. of 20 to 1,000,000 mPa·s. The composition further comprises (B) a silicon-bonded aryl group-containing alkoxysilane, (C) an organic compound having at least two alkoxysilyl groups in one molecule (and being free of siloxane bonds), and (D) a curing catalyst. Components (A), (B), (C), and (D) are not contained simultaneously in the composition. The composition generally shows sufficient usable life at low temperatures, curing properties with low dependence on temperature and excellent curability at low temperatures, and excellent adhesion.