摘要:
A refractive index modulation element made of a refractive index modulation material. The refractive index can be thermally modulated. The refractive index modulation material can be a silicone resin represented by the following formula R.sub.n SiO.sub.(4--n)/2,where the average value of n is 0.5 to 3 and where K is an aliphatic or aromatic group with 1 to 18 carbon atoms or other functional group. The silicone resin has a spectral transmission factor that on average is higher than 80%, within the wavelength range of 350 nm to 1,600 nm, and a refractive index temperature dependence of -0.001/.degree.C. to -0.00005/.degree.C.
摘要:
This invention provides curable compositions comprising a polytitanosiloxane containing at least two alkenyl radicals per molecule and a crosslinking agent that is either 1) the combination of an organohydrogensiloxane containing at least two silicon-bonded hydrogen atoms per molecule and a platinum-containing catalyst or 2) an organic peroxide. This invention also provides a method for curing a polytitanosiloxane by reacting it with the crosslinking agent of the present compositions.
摘要:
Cross-liked resins exhibiting a high level of optical transparency and little variation of refractive index with temperature are prepared using mixtures of two organosiloxane resins in combination with a reinforcing silica filler. The types and relative concentrations of hydrocarbon radicals in the resins are within specified limits to obtain the required optical properties and each resin contains groups that react with groups on the other resin to form a crosslinked network.
摘要:
The invention is a method for the preparation of organic solvent-soluble polytitanosiloxanes that contain units with the formulas R.sup.1.sub.a R.sup.2.sub.(3-a) SiO.sub. 1/2 (M units), SiO.sub. 4/2 (Q units) and TiO.sub. 4/2. The method comprises hydrolyzing tetraalkyl titanate or a partial hydrolyzate-condensate thereof and tetraalkyl silicate or a partial hydrolyzate-condensate thereof using water in an amount which is less than 80% of the amount theoretically necessary for the hydrolysis of all the alkoxy groups, and reacting the cohydrolyzate-cocondensate with at least 1 silane compound with the formula R.sup.1.sub.a R.sup.2.sub.3-a) SiOR.sup.3, where in the preceding formulas, R.sup.1 is the hydrogen atom or a monovalent organic group, R.sup.2 is a monovalent organic group, R.sup.3 is the hydrogen atom or an acyl group having no more than 8 carbon atoms, and a is an integer with a value of 0 to 3.
摘要:
The present invention is a novel method for the manufacture of branched polysiloxanes having the polysiloxane SiO.sub.4/2 unit as the branch center precisely bonded to one end of a diorganopolysiloxane. The present invention concerns a method for the manufacture of a branched polysiloxane characterized by reacting alinear polysiloxane with a reactive polysiloxane having halogen substitution.
摘要:
The present invention concerns novel reactive polysiloxanes and a method for their manufacture. More specifically, the present invention concerns polysiloxanes of mainly SiO.sub.4/2 polysiloxane units which have highly reactive halogen atoms bonded to silicon and a method for their manufacture.
摘要:
The present invention is a method for the preparation of branched organopolysiloxane in which polysiloxane with the formula SiO.sub.2 constitutes the branching center or branch origin and the terminal on only one side of diorganopolysiloxane is bonded to the branch origin wherein this bonding is exactly to the branch origin. Specifically, the method for preparation of branched polyorganosiloxane comprises the reaction of an alkali metal compound with a silanol-containing polysiloxane described by formula{SiO.sub.4/2 }.sub.x {R.sup.1.sub.2 (OH)SiO.sub.1/2 }.sub.y {R.sup.1.sub.3 SiO.sub.1/2 }.sub.z {RO.sub.1/2 }.sub.u,wherein each R.sup.1 is independently selected from a group consisting of C1-8 alkyls, haloalkyls, alkenyls, and aryls; R is selected from a group consisting of hydrogen atom and C1-8 alkyls; 2.ltoreq.x.ltoreq.500; 2.ltoreq.y+z+u.ltoreq.150; 2.ltoreq.y; 0.ltoreq.z; 0.3 .ltoreq.(y+z+u)/x.ltoreq.3; and 0.ltoreq.u/(x+y+z).ltoreq.0.1); by subsequent reaction with cyclic organopolysiloxane described by formula{SiR.sup.2 R.sup.3 O}.sub.m,where R.sup.2 and R.sup.3 are defined as for R.sup.1 and 3.ltoreq.m.ltoreq.8; and finally by endcapping with triorganomonohalosilane or protic acid.
摘要:
The invention is a method for the preparation of organic solvent-soluble polyheterosiloxanes containing MO.sub.2 (M=Ti or Zr) and SiO.sub.2 units. A compound MA.sub.4 (M=Ti or Zr, A=hydrolyzable group) and a compound Si(OR).sub.4 (R=hydrocarbon group or alkali metal atom) are hydrolyzed and condensed in the presence of a carboxylic acid, a phenol, or a diketone. This is followed by the addition of an organosilane R.sup.1.sub.3 SiX (R.sup.1 =hydrogen or hydrocarbon group, X=hydrolyzable group) and hydrolysis and condensation.
摘要:
The introduction of a branched organopolysiloxane in which polysiloxane with the formula SiO.sub.2 constitutes the branching center or branch origin and the terminal on only one side of diorganopolysiloxane is bonded to the branch origin wherein this bonding is exactly to the branch origin. The branched organopolysiloxane is described by formula(SiO.sub.4/2).sub.x (R.sup.1.sub.2 ASiO.sub.1/2).sub.y (R.sup.1.sub.3 SiO.sub.1/2).sub.z (RO.sub.1/2).sub.u,wherein each R.sup.1 is independently selected from a group consisting of C.sub.1-8 alkyls, haloalkyls, alkenyls, and aryls; A is described by formula--(OSiR.sup.2 R.sup.3)n--R.sup.4wherein R.sup.2 and R.sup.3 are independently selected from a group consisting of C.sub.1-8 alkyls, haloalkyls, alkenyls, and aryls, R.sup.4 is selected from a group consisting of C.sub.1-8 alkyls, haloalkyls, alkenyls, hydrogen atom and hydroxyl, and 1.ltoreq.n.ltoreq.1,000; R is selected from a group consisting of hydrogen atom and C.sub.1-8 alkyls; 2.ltoreq.x.ltoreq.500; 0.ltoreq.z; 0.ltoreq.u.ltoreq.15; 2.ltoreq.y+z+u.ltoreq.150; 0.3.ltoreq.(y+z+u)/x.ltoreq.3.0; z+u>0; and 0.ltoreq.u/(y+z+u).ltoreq.0.1.
摘要:
An outboard motor includes a cooling water passage that guides cooling water to cool an exhaust passage and a cylinder unit. A cooling water intake port draws external cooling water into the cooling water passage. A water pump draws cooling water into the cooling water intake port and supplies the cooling water to the cooling water passage. A thermostat is arranged in the cooling water passage downstream of the catalytic converter and the cylinder unit. A first bypass passage is connected to a first connecting section provided on the cooling water passage. The first connecting section is provided along the cooling water passage at a position farther downstream than the catalytic converter and farther upstream than the thermostat.