A plastic pump comprises a complete body having an inner body made of a fluorine resin and an outer body made of a plastic material by molding the plastic material in a first mold after fixing a pre-manufactured inner body to the first mold, an impeller made of a fluorine resin material by means of injection molding, and an impeller cover made of a plastic material by molding the plastic material in a second mold to protect the impeller, and a fluid transporting path is lined with the fluorine resin of the inner body.

The invention relates to a thermally insulated conduit pipe, comprising at least one medium pipe, at least one thermal insulation arranged around the medium pipe, and at least one outer jacket arranged around the thermal insulation, wherein the outer jacket possibly comprises a barrier made of plastic, and wherein the thermal insulation comprises a foam, the cell gas of which contains at least 10 vol % HFOs. Such conduit pipe has good insulating behavior, good environmental balance, and is easily producible.

To provide a polymer wherein a linking group that connects the main chain of the polymer and a cyclic perfluoroaliphatic disulfonimide skeleton, is a fluoroalkylene group which may have an ether oxygen atom. A polymer which has either one or both of units represented by formula u1-1 and units represented by formula u1-2: ##STR00001##
R.sup.F1, R.sup.F2: a C.sub.1-3 perfluoroalkylene group; R.sup.F3: a C.sub.1-6 perfluoroalkylene group; m: 0 or 1; and X: a hydrogen atom, an alkali metal atom, a fluorine atom, an alkyl group, ammonium or the like.

Disclosed is polymer-ceramic composite material with colossal permittivity, comprising polymer matrix and ceramic powders embedded in the polymer matrix, wherein a part of the polymer matrix is exposed and adsorbed to the surface of the ceramic powders, and the polymer is electrically insulating. This invention simultaneously achieves large dielectric constant, negligible dielectric loss and high energy density in flexible composite capacitors based on metal-ion co-doped colossal permittivity materials. The host oxides used in this CP system is friendly to the environment, non-toxic and abundant. Additionally, the process developed is relatively simple, low cost and suitable for mass production-scale. Therefore, these composite capacitors have great technological potential for many applications. Compared to the conventional ceramic materials, composites of this invention are lightweight, scalable and easily fabricated into complex shapes towards miniaturization of the compact systems. The additional flexibility feature also possesses broad application prospects in modern electronic and energy storage devices.

The present disclosure provides a welded body having a connecting structure formed by welding a first molded body and a second molded body, wherein the first and second molded bodies contain at least one copolymer selected from the group consisting of a tetrafluoroethylene/fluoro (alkyl vinyl ether) copolymer and a tetrafluoroethylene/hexafluoropropylene copolymer, and wherein the connecting structure has a liquid contact surface to be in contact with a liquid having a solubility parameter of 14 to 35 (MPa).sup.1/2, a welded part formed in the connecting structure is not exposed to the liquid contact surface, and the number of particles of 30 nm or larger to be eluted from the liquid contact surface in the connecting structure is 1,000 particles/ml or less.

There is provided an injection molded article obtained by injection molding a copolymer using a mold provided with a gate, wherein the copolymer contains tetrafluoroethylene (TFE) unit and a fluoro(alkyl vinyl ether) (FAVE) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 5.2 to 6.3% by mass with respect to the whole of the monomer units, the melt flow rate at 372 C. of the copolymer is 19.0 to 35.0 g/10 min, the number of functional groups of the copolymer is 50 or less per 10.sup.6 main-chain carbon atoms, and the injection molded article has a gate section corresponding to the gate of the mold, and the ratio of the maximum flow length (a) from the gate section of the injection molded article to the average value (b) of the product thickness on the maximum flow length, ((a)/(b)), is 80 to 200.

Provided an injection molded article obtained by injection molding a copolymer using a mold provided with a gate, wherein the copolymer contains tetrafluoroethylene (TFE) unit and a fluoro(alkyl vinyl ether) (PAVE) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 3.5 to 4.7% by mass with respect to the whole of the monomer units, the melt flow rate at 372 C. of the copolymer is 22.0 to 35.0 g/10 min, the number of functional groups of the copolymer is 20 or less per 10.sup.6 main-chain carbon atoms, and the injection molded article has a gate section corresponding to the gate of the mold, and the ratio of the maximum flow length from the gate section of the injection molded article (a) to the average value of the product thickness on the maximum flow length (b), ((a)/(b)), is 80 to 200.

Provided is an injection molded article containing a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, wherein the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 3.9 to 4.8% by mass with respect to the whole of the monomer units, the melt flow rate at 372 C. of the copolymer is 11.0 to 19.0 g/10 min, the melting point of the copolymer is 296 to 305 C., and the amount of fluorine ions dissolving out from the injection molded article into water is 7,500 g/m.sup.2 or lower.

Provided is an injection molded article containing a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, wherein the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 4.7 to 7.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372 C. of the copolymer is 11.0 to 22.0 g/10 min, the melting point of the copolymer is 296 to 305 C., and the amount of fluorine ions dissolving out from the injection molded article into water is 7,500 g/m.sup.2 or lower.

Provided is an injection molded article including a bottom surface section, and a side surface section erected from a peripheral edge of the bottom surface section, wherein the height from the bottom surface section of the side surface section is 3.8 cm or larger, the ratio of the height from the bottom surface section of the side surface section to the average thickness of the side surface section (height/thickness) is 19.0 or more, the load applied to the lower end section of the side surface section is 0.8 kPa or higher, the injection molded article contains a copolymer containing tetrafluoroethylene unit and a fluoro(alkyl vinyl ether) unit, the content of the fluoro(alkyl vinyl ether) unit of the copolymer is 4.5 to 6.0% by mass with respect to the whole of the monomer units, the melt flow rate at 372 C. of the copolymer is 35.0 to 60.0 g/10 min, and the number of functional groups of the copolymer is 50 or less.