Abstract: A pressing bag comprising silicone rubber sheets and uncured silicone members for covering a prepreg placed on a molding die to cure the prepreg in an evacuated state, the pressing bag being integrally molded in a shape in agreement with the molding die.

Abstract: A pressing bag comprising silicone rubber sheets and uncured silicone members for covering a prepreg placed on a molding die to cure the prepreg in an evacuated state, the pressing bag being integrally molded in a shape in agreement with the molding die.

Abstract: A slip casting mold includes a water absorption layer having self water absorption capability and substantial water resistance. With the water saturation percentage of the water absorption layer being controlled, a slurry layer is deposited in the slip casting mold mainly under capillary attractive forces of the slip casting mold. The water absorption layer comprises an open porous body which is manufactured by stirring a mixture of an epoxy compound having at least one epoxy ring in one molecule, a hardener for reacting with the epoxy compound to harden the epoxy compound, a filler for developing self water absorption capability and mold releasability, and water into an O/W-type emulsion slurry, and casting the emulsion slurry into a mold impermeable to water, hardening the emulsion slurry in the mold while containing water.

Abstract: A method for cutting a honeycomb core which has a plurality of hollow tubular cells, wherein the method includes the steps of: filling or coating a hollow tubular cell of the honeycomb core with a resin composition that is in a gel state at an ordinary temperature; cooling the resin composition to a solid state; cutting the hollow tubular cell together with the resin composition in the solid state; allowing to stand or heating the resin composition to a gel state; and removing the resin composition in the gel state from the hollow tubular cell.

Abstract: A method for cutting a honeycomb core comprising a plurality of hollow tubular cells, wherein the method comprises the steps of: filling or coating a hollow tubular cell of the honeycomb core with a resin composition that is in a gel state at an ordinary temperature; cooling the resin composition to a solid state; cutting the hollow tubular cell together with the resin composition in the solid state; allowing to stand or heating the resin composition to a gel state; and removing the resin composition in the gel state from the hollow tubular cell.

Abstract: A method of slip casting using a casting mold provided with a water-absorbent layer that has a self-water-absorbent ability, substantially has a water resistance, and is controlled in the saturated water content thereof, the slip casting being conducted by employing mainly a capillary sucking force as the driving force of the water-absorbent layer of cast formation. An open-cell porous body usable as the water-absorbent layer is produced by agitating a mixture comprising a compound having at least one epoxy ring in its molecule, a curing agent which cures the epoxy compound by reaction, a filler developing for a self-water-absorbent ability and a mold release property, and water to prepare an O/W emulsion slurry and curing the slurry, as such in a hydrous state.

Abstract: A block copolymer comprising a polyphenylenesulfide portion and a polysulfone portion, and having a logarithmic viscosity [.eta.] in the range of 0.03 to 1.0, said logarithmic viscosity [.eta.] being a value calculated by the following equation from a relative viscosity measured at 206.degree. C. for a solution of a polymer in .alpha.-chloronaphthalene in a polymer concentration of 0.4 g/100 ml.[.eta.]=ln (relative viscosity)/polymer concentration;and a resin composition comprising a block copolymer composed of a polyphenylenesulfide portion and a polysulfone portion, polyphenylenesulfide and/or polysulfone, and if required, a filler.