摘要:
A siloxane gum is prepared by adding a silane or siloxane having two hydrolyzable groups in a molecule to a silanol-terminated organopolysiloxane in such an amount to give a molar ratio of silanol group/hydrolyzable group of from 0.5 to 3 and effecting condensation polymerization. The resulting organopoly-siloxane has a degree of polymerization of higher than 1,000 and a minimized content of low-molecular weight cyclic siloxanes of less than 5,000 ppm.
摘要:
A method of producing a silicone rubber composition, comprising heating a mixture of an organopolysiloxane having a silanol group at both the ends of the molecular chain, a end blocking agent, such as a triorganosilanol, a silane or a siloxane having two dialkylaminosilyl groups in the molecule, and a reinforcing filler thereby carrying out chain lengthening and end blocking of said organopolysiloxane. According to this method, a silicone rubber composition whose low-molecular siloxane content is held down remarkably can be produced without consuming a large amount of energy for the mixing.
摘要:
The silicone rubber composition of the present invention comprises (A) an organopolysiloxane obtained by mixing and heating an organopolysiloxane having a silanol group at both ends of the molecular chain and a silane or a siloxane having two hydrolyzable groups in the molecule, (B) a finely divided silica, and (C) a curing agent. The composition, wherein the content of low-molecule siloxanes is remarkably constrained, is quite useful in the application wherein low-molecular siloxanes are obnoxious, for example, in the application of electrical contacts and parts used adjacent thereto, roll materials of copying machines, gaskets for construction, etc.
摘要:
Organopolysiloxanes having a silanol group at both terminal ends of molecular chain thereof are brought into condensation reaction with each other in the presence of a silane or siloxane having at least two dialkylaminosilyl groups per molecule as a condensation catalyst and a triorganosilanol or other endblocking agent, to lengthen the chain of the organopolysiloxane under reaction, whereby a triorganosilyl-endblocked organopolysiloxane with a high polymerization degree is obtained. The process yields a triorganosilyl-endblocked high-polymerization-degree organopolysiloxane while effectively suppressing or preventing the formation of low-molecular-weight siloxanes.
摘要:
A conductive silicone rubber composition is prepared by mixing an organopolysiloxane having an aminoalkyl radical, an organopolysiloxane having a (meth)acryloxyalkyl or glycidoxyalkyl radical, and conductive carbon black to form silicone rubber composition (A) in which the carbon black is fixed, and then mixing it with a silicone rubber composition (B) comprising a dimethylpolysiloxane. The composition has stable resistivity in the semiconductive region independent of molding conditions.
摘要:
A manufacturing method of organosilanes having silanol groups which is characterized by mixing organoalkoxy silanes, having at most a 20 ppm content of chlorine, expressed by the general chemical formula (1) below:Si(R.sup.1).sub.m (R.sup.2).sub.n (OR.sup.3).sub.k (1)wherein each of R.sup.1 and R.sup.2 is either a substituted or unsubstituted monovalent hydrocarbon group; R.sup.3 is an alkyl group of 1 to 4 carbon atoms; subscripts m and n are 0, 1, 2, or 3; k is either 1 or 2; and the sum of subscripts m+n+k=4, with ion-exchanged water having an electroconductivity of at least 10.sup.10 M.OMEGA., then further adding a macro-porous cation-exchange resin with a pore volume measured by the mercury injection method of at least 0.1 ml/g to the said mixture, followed by stirring of the mixture and removal of the cation-exchange resin. According to the present invention, organosilanes having silanol groups which are useful as a dispersing agent in silicone rubbers may be obtained by a simple process from organoalkoxy silanes, such as relatively inexpensive dimethoxy dimethyl silane.
摘要翻译:具有硅烷醇基的有机硅烷的制造方法,其特征在于混合由通式(1)表示的含有至多20ppm含量的有机烷氧基硅烷:Si(R 1)m(R 2)n(OR 3)k (1)其中R1和R2各自为取代或未取代的单价烃基; R3是1-4个碳原子的烷基; 下标m和n分别为0,1,2或3; k是1或2; 和下标m + n + k = 4的总和,其中离子交换水的电导率至少为1010M欧米茄,然后进一步加入具有通过汞注入法测量的孔体积的大孔阳离子交换树脂 至少0.1ml / g,然后搅拌混合物并除去阳离子交换树脂。 根据本发明,可以通过有机烷氧基硅烷如相对廉价的二甲氧基二甲基硅烷的简单方法获得在硅橡胶中用作分散剂的具有硅烷醇基的有机硅烷。
摘要:
A method for designing a semiconductor device includes computing a contact resistance value based on an allowable power supply voltage drop set for a second position corresponding to a given region of a second power supply line on a second wiring layer different from a first wiring layer, and computing a number of vias for the given region based on a result of a comparison between a resistance value of a via coupling a first power supply line and the second power supply line and the contact resistance value.
摘要:
A floorplanning apparatus includes a seed position decision section for deciding a placement position of a logic seed of each hierarchical block; a cell placement section for placing cells belonging to the hierarchical block around the placement position of each logic seed; and a placement region decision section for deciding placement and routing regions of each hierarchical block considering cell placement results produced by the cell placement section.
摘要:
A home electronics system enabling rapid execution of remote control of controlled devices includes a home server, a cellular phone connected to the home server via a public line network, and devices to be controlled controlled in response to a signal from the home server. When the user selects via cellular phone an area, a state or a type of the devices to, the home server creates an image of the current state information showing the state of the devices for transmitting to the cellular phone.
摘要:
A built-in self-test circuit including a signal generator and operational elements. The operational elements perform arithmetic operations on a test signal value A, generated by the signal generator, to obtain a comparison signal value A which is fundamentally equal to the test signal value A of the signal generator. By comparing the test signal value A with the comparison signal value A, a test result is obtained.