In an automatic bread maker, after the temperature of temperature control means (7) reaches a predetermined temperature, the rate of energization of a heater (2) is fixed by control means (14), and by doing so, bread, having a predetermined baking color, can be stably prepared.

Automatic bread maker

Provided is an underside protective sheet for solar cells that has superior gas-barrier properties against oxygen, water vapor, or the like. The underside protective sheet for solar cells is characterized by comprising: a composite substrate (1) configured from platy inorganic particles and a polymer having a water vapor permeability of 10g/m 2 per day or less when measured on the basis of JIS K7126 at 23℃ with a relative humidity of 90% and a thickness of 100μm; and a sol-gel layer (2) that is formed by being laminated on top of and integrated with the aforementioned composite substrate (1) and by hardening one or more compounds selected from (A) a silicon compound represented by R 1 n Si(OX) 4-n or a hydrolysate thereof, (B) an organic metal compound represented by M(OX) m or a hydrolysate thereof, and (C) an alkali metal polysilicate.

Underside protective sheet for solar cell, solar cell module, and gas-barrier film

The present invention relates to a resin composition having a high dielectric constant and a low dielectric loss tangent under high frequency conditions and articles obtained therefrom. The resin composition comprises 100 parts by weight of thermoplastic resin and 50-900 parts by weight of ferroelectric material. The formed articles can be used as substrates for a miniaturized antenna or circuit.

Resin composition and articles made therefrom

A press-through package obtained by placing objects to be packed, in the accommodating pockets formed by vacuum forming or the like of a sheet made of a thermoplastic norbornene type resin, particularly preferably a hydrogenated product of ring-opening polymerization product of a dicyclopentadiene type monomer, and then closing the openings of pockets of the sheet with another sheet such as metal foil to pack the objects to be packed, which package makes the packed objects clearly visible in the pocket portions, prevents the deterioration of the packed objects by moisture bacause of its excellent water vapor barrier properties, and is good in production efficiency.

Press-through package

PURPOSE:To provide the subject molded article having excellent heat-resistance, solvent resistance, rigidity and impact resistance and composed of a (co)polymer produced by the ring-opening polymerization of a specific cycloolefin. CONSTITUTION:The objective molded article is composed of a (co)polymer produced by the ring-opening polymerization of a cycloolefin of formula (n is 0 or positive integer; R to R are H, halogen or hydrocarbon group; R to R may be bonded with each other to form a monocyclic or polycyclic group which may contain double bond; R and R or R and R may together form an alkylidene group), its hydrogenated product and/or a copolymer produced by the addition polymerization of the cycloolefin of formula with an ethylene component.

Injection-molded article composed of cycloolefin polymer

PURPOSE:To prepare the title hydrogenated product having excellent heat resistance and mechanical characteristics and good balance among transparency, water resistance etc., and being usable in a wide range of application fields, by hydrogenating a part or the whole of olefinically unsatd. groups of a specified ring-opening polycyclic norbornene copolymer. CONSTITUTION:A ring-opening polycyclic norbornene copolymer having repeating units of formulas IV and V wherein at least 50% of bonds of formula III constituting the main chain are single bonds is prepd. by hydrogenating a part or the whole of olefinically unsatd. groups of a ring-opening polycyclic norbornene copolymer contg. 90-30mol.% repeating units of formula I or alkyl deriv. thereof and 10-70mol.% repeating units of formula II or alkyl deriv. thereof and having an intrinsic viscosity [eta] of 0.01-20dl/g as measured at 25 deg.C in toluene with hydrogen by using a hydrogenation catalyst. This hydrogenated product has excellent heat resistance, mechanical strengths, transparency and, resistance to water absorption and is usable in a wide range of application fields such as an optical field.

Hydrogenated product of ring-opening copolymer and preparation thereof

PURPOSE:To prepare an addition polymer having an excellent heat resistance, by polymerizing a product obtd. by the heat treatment of dicyclopentadienes and ethylene in the presence of a Ziegler catalyst. CONSTITUTION:A dicyclopentadiene is submitted to heat treatment in the presence of an antioxidant, if necessary, in an inert gaseous atmosphere at 120-250 deg.C for 0.5-20hr to give a product A which is waxy with a coagulating point of 100 deg.C or lower, or which is oily with a viscosity of 200cps (at 30 deg.C). The component A and ethylene B in a molar ratio of B to A of 95-0/5-100 are polymerized in the presence of a Ziegler catalyst C consisting of a transition metal compd., such as a Ti compd., a Ti compd. supported on an Mg compd. or a V compd., and a reducing agent, such as an alkylaluminum compd., in a hydrocarbon medium under a pressure of 0-50kg/cm at -50-300 deg.C to give an addition polymer. This polymer is hydrogenated, if necessary, in the presence of a hydrogenation catalyst.

Preparation of addition polymer

PURPOSE:To obtain a polymer having excellent optical suitability, by heat- treating a dicyclopentadiene alone or a mixture of dicyclopentadiene and a dienophile to give the title monomer and subjecting the monomer to ring opening polymerization. CONSTITUTION:A dicyclopentadiene alone or a mixture of the dicyclopentadiene and a dienophile (aliphatic or aromatic olefin) is heat-treated in an inert gas atmosphere at 150-230 deg.C for 1-10hours to give a tetra or more cyclic polycyclic norbornene monomer, solvent-insoluble components existing in the resulting substance are removed by filtration or solvent extraction to give the above-mentioned monomer having >=85% light transmission, which is subjected to ring opening polymerization to give a polymer. The heat treatment is carried out preferably in the presence of a phenolic antioxidant. The polymerization is done in the presence of a catalytic system containing a transition metal compound and an organic metal or the transition metal compound, the organic metal and a third component such as triethylamine.

Production of polycyclic norbornene monomer and polymer thereof

PURPOSE:To obtain a thin film body for optical use having >=80% transmittance of 300nm light by providing a solvent-soluble dicyclopentadiene ring opening polymer or the partially hydrogenated matter thereof to said body. CONSTITUTION:The ring opening polymer of the dicyclopentadiene or the hydrogenated matter thereof is a polymer having the structural unit body expressed by the formula I. In the formula, between CH and CH is indicated as to be a single bond or double bonds. This ring opening polymer is produced by using the dicyclopentadiene as a monomer and producing the polymer by a known ring opening polymn. method for cyclic olefin. The hydrogenated matter of the ring opening polymer is also produced by utilizing an ordinary hydrogenation reaction method. The thin film body for optical use, the resin material of which has excellent transparency, water resistance, heat resistance, etc., and has >=80% transmittance of 300nm rays, is thereby obtd.

Nishi Giichi

Papers

Hydrogenated product of ring-opening copolymer and preparation thereof

Preparation of addition polymer

Production of polycyclic norbornene monomer and polymer thereof

Thin film body for optical use