摘要:
A novel epoxy resin composition is comprised of a mixture of a cyclic epoxide type epoxy resin having an epoxy equivalent of 200 or below and a phenoxy resin having a molecular weight of approximately 30,000, a curing agent, and an inorganic filler. This resin composition is useful in the fabrication of cast insulators to be employed in electric machines.
摘要:
An epoxy resin composition consisting essentially of an epoxy resin having an epoxy equivalent of 200 or lower, a mixture of polybasic carboxylic acid anhydride and aromatic ester as a curing agent, and inorganic powder as a filler.
摘要:
An epoxy resin composition which comprises:(a) an epoxy resin having an epoxy equivalent of at most 200;(b) a condensation mixture of 1 mol of a polybasic carboxylic acid anhydride, from 0.07 to 0.3 mol of a bisphenol A having the formula: ##STR1## and from 0.07 to 0.3 mol of a monohydric phenol having the formula: ##STR2## wherein R is an alkyl group, as a curing agent; and (c) an inorganic powder, as a filler.
摘要:
A novel epoxy resin composition is prepared by first mixing 100 parts by weight of an epoxy resin having an epoxy equivalent of no more than 200 with 0.5-10 parts by weight of a phenoxy resin to form a uniform mixture, then blending the mixture with a curing agent (i.e., a condensation product of a polybasic carboxylic acid and bisphenol A) and an inorganic filler. The epoxy resin composition has a suitable degree of rigidity and softness within the molecular chain without sacrificing its resistance to heat or thermal shock and will not cause precipitation of any portion of the filler in the resin composition. This resin composition is useful in the making of cast insulators employed in electric machines.
摘要:
An epoxy resin composition consisting essentially of a heat-melted mixture obtained by mixing under heat 100 parts by weight of an epoxy resin having an epoxy equivalent of 200 or below and 0.5 to 10 parts by weight of polysulfone resin; a curing agent; and an inorganic filling material.
摘要:
An epoxy resin composition which comprises an epoxy resin having an epoxy equivalent of at most 200; a condensation mixture (A) of a polybasic carboxylic acid anhydride, a bisphenol A having the formula: ##STR1## and a polyhydric alcohol, as a curing agent; and an inorganic powder, as a filler.
摘要:
A container from which its contents can be readily taken out by a simple one-hand finger operation, is provided. The container comprises a lid and a container main body and is sealed at least at its peripheral flange. The container main body can be bent outwardly, and it comprises two contents-holding portions which are divided by the portion for bending and which are designed such that when the container main body is bent these two portions may be pressed by each other. The lid comprises at least a monoaxially oriented film. The lengthwise direction of the portion for bending coincides with the direction of orientation of the monoaxially oriented film. A non-sealed portion is provided at an edge portion of the peripheral flange coincident with at least one end of the portion for bending, and at least two slit lines for initiating tear are provided in a part of the lid which constitutes the non-sealed portion.
摘要:
A method of continuous molding a rod-like product includes forming an uncured rod-like molding by passing reinforcing fibers impregnated with uncured thermosetting resin through a squeezing die having a predetermined shape. Molten thermoplastic fluororesin is extruded in a ring shape to enclose the rod-like molding. A sheathing layer of the thermoplastic resin is formed by causing the thermoplastic resin to come into contact with the outer periphery of the uncured rod-like molding and by cooling and solidifying the thermoplastic resin. The uncured rod-like molding and the sheathing layer are introduced into a heated tank thereby hardening the thermosetting resin. The sheathing layer is stripped from the molding to form a rod-like product having a surface of fiber reinforced thermosetting resin.
摘要:
The invention provides a method for purification of an .alpha.-olefin selected from ethylene and propylene for polymerization use which comprises contacting the .alpha.-olefin with an alkali metal carried on a support material. The invention further provides a method for production of a poly-.alpha.-olefin which comprises polymerizing the thus purified .alpha.-olefin in the presence of a polymerization catalyst comprising a transition metal catalyst component and an organometallic catalyst component.
摘要:
A cleaning device for use in an image forming apparatus which includes an image carrier, an image forming device to form a toner image on the image carrier, and a transferor to transfer the toner image from the image carrier onto a recording sheet, in which the cleaning device cleans a residual toner on the image carrier after transferring. The cleaning device includes a cleaning blade to scrape off the residual toner on a circumferential surface of the image carrier, a contacting member to bring a tip end of the cleaning blade into contact with the circumferential surface of the image carrier in a direction upstream of a moving direction of the image carrier when a cleaning operation of the blade is conducted, and a releasing member to release the tip end of the cleaning blade from the circumferential surface. The blade is made of an elastic member having a coefficient of dynamic friction between the blade and the image carrier of 0.15 to 0.4.