摘要:
A process for preparing a highly pure silicone ladder polymer of the general formula (1): wherein R1 and R2 represent F, H, a lower alkyl group, an alkenyl group, an aryl group, a lower fluorinated alkyl group, a fluorinated alkenyl group or a fluorinated aryl group; R3, R4, R5 and R6 each represents H, a lower alkyl group or a lower fluorinated alkyl group; and n represents an integer of 5 to 10000, which comprises: (a) a step of obtaining a prepolymer in which at least one organosilane compound is dissolved in an organic solvent and hydrolyzed with ultrapure water; (b) a step of washing the obtained prepolymer with ultrapure water; and, (c) a step of dissolving the washed prepolymer in an organic solvent and heating without a catalyst.
摘要:
An electromagnetic coil having an insulating coating formed by alternately laminating, on a coil conductor, a mica layer including mica and a reinforcing layer including fiber reinforcing material, inorganic particles and resin, wherein the inorganic particles include secondary agglomerate particles formed by agglomeration of primary particles of hexagonal crystal boron nitride. The electromagnetic coil is provided with an insulating coating that suppresses external outflow of inorganic particles and ensures favorable thermal conductivity. Furthermore, the invention also provides an insulating tape having a mica layer including mica and a reinforcing layer including fiber reinforcing material, inorganic particles and resin, which is layered on the mica layer, wherein the inorganic particles include secondary agglomerate particles formed by agglomeration of primary particles of hexagonal crystal boron nitride. This insulating tape is provided with an insulating coating that suppresses external outflow of inorganic particles and ensures favorable thermal conductivity.
摘要:
A semiconductor device having a stress-buffering film which is effective in buffering the stress caused by a molding resin during sealing, the stress-buffering film being made of a silicone ladder resin represented by formula (I) ##STR1## wherein each end group R may be the same or different and represents a hydrogen atom or an alkyl group, each side chain R' may be the same or different and represents a cyclohexyl group, a lower alkyl group, or a photopolymerizable unsaturated group, and n is an integer of 10 or larger.
摘要:
A colored paste composed of a silicone ladder polymer, a solvent, and an organic pigment insoluble in said solvent, said silicone ladder polymer being a polymer having an average molecular weight of 1.0.times.10.sup.3 to 3.5.times.10.sup.5. The colored paste has good storage stability and readily forms a uniform film by spin coating.
摘要:
The liquid thermosetting resin composition of the present invention comprises an epoxy resin in which at least one selected from the group consisting of a linear epoxy resin having a degree of polymerization of 2 or more and an epoxy acrylate resin and at least one selected from the group consisting of a novolac-type epoxy resin and a naphthalene-type epoxy compound are linked to each other via an ether linkage, and which has a weight average molecular weight of from 2,000 to 10,000. When the liquid thermosetting resin composition of the present invention is used for insulating a stator coil of a rotating electric machine, mechanical characteristics can be improved without causing a reduction in the heat resistance.
摘要:
To obtain water-dispersible varnish used in an alternative refrigerant/refrigerating machine oil refrigerant system or a natural refrigerant/refrigerating machine oil refrigerant system, the water-dispersible varnish being capable of solving two problems, namely, reducing the volatile components and the like during thermal curing and resistance of the cured varnish to the refrigerant system,wherein the water-dispersible varnish has a specific thermosetting resin as base polymer, a specific vinyl monomer as reactive diluent, organic peroxide as reaction initiator, and water mixed therein.
摘要:
Data related to an attractive force between a substrate holder 3 and a substrate 2 is detected when pushing up and releasing the substrate 2 from the substrate holder 3, and when the attractive force is detected to be greater than a predetermined value, the push-up operation is regulated by a controller 18.
摘要:
In a plasma processing apparatus having an upper electrode and a lower electrode in a vacuum chamber, a substrate receiving face of the lower electrode is formed to have a same convex surface as a deflected face of a substrate on condition that surface of the substrate is freely supported on an circumference thereof, and a uniform pressure is applied to the back of the substrate.
摘要:
An apparatus for concentrating polyvinyl alcohol liquid which comprises a supply line for supplying a liquid containing polyvinyl alcohol, a filter in connection with the supply line for filtering foreign materials from the liquid, a first tank for receiving the liquid after the liquid is passed through the filter, a preliminary mixing apparatus in fluid connection with the first tank, an evaporator in fluid connection with the preliminary mixing apparatus, the evaporator including a plurality of pipes through which the liquid may flow, a steam heating assembly in connection with the evaporator for heating the liquid flowing through the plurality of pipes, a second tank in fluid connection with the evaporator, the second tank receiving the liquid from the plurality of pipes within the evaporator, a return pipe in fluid connection with the second tank for returning liquid contained within the second tank to the preliminary mixing apparatus such that the liquid may be combined within the preliminary mixing apparatus with the liquid from the first tank, an outlet pipe in fluid connection with the second tank, a viscometer in connection with the outlet pipe, a regulating valve within the outlet pipe with the regulating valve being controlled by signals from the viscometer, and a pipe for leading vaporized polyvinyl alcohol waste liquid outwardly from the evaporator. The polyvinyl alcohol liquid is thereby recovered and made re-usable for sizing of fabrics.
摘要:
An optical scanning apparatus formed by combining a reflector and a frame in a gimbal construction and having two heart cams held in contact respectively with the reflector and the frame. The heart cams, when rotated each in a fixed direction, impart longitudinal and lateral oscillations to the reflector, enable the incident beam such as of an ultraviolet beam to provide planar scanning of the surface of a given test specimen and, at the same time, permit signals detected in the form of the amounts of oscillations of the reflector to be utilized as output signals for synchronization with a CRT.