Abstract: Hot water (12) in a bath (11) is pumped up by a suction pump (9) and introduced into a carbon dioxide gas dissolver (7) through solution flow rate adjusting means (14) and then, poured into the bath (11). Carbon dioxide gas supplied from a carbon dioxide gas cylinder (1) is introduced into the carbon dioxide gas dissolver (7) through gas flow rate adjusting means (5). At this time, the quantity of bubbles existing in artificial carbonated spring in a take-out pipe (15) is measured with a measuring device (13), and the solution flow rate adjusting means (14), gas flow rate adjusting means (5) and the like are controlled by means of a control device (16) using a relational expression between a preliminarily set quantity of bubbles and carbon dioxide concentration to obtain a desired concentration of carbon dioxide gas in carbonated spring.

Abstract: The present invention provides a gas-permeable hollow fiber membrane having an inner diameter of 50 to 500 &mgr;m, which is preferably a composite hollow fiber membrane having a three-layer structure consisting of a nonporous layer having porous layers disposed on both sides thereof. This membrane can be used to remove dissolved gases present in an ink.

Abstract: N-(3-acetylthio-2-D-methylpropionyl)-L-proline useful as a precursor of captopril, one of antihypertensive agents, is prepared by allowing thioacetic acid to react with methyl methacrylate to prepare racetalc methyl 3-acetylthio-2-DL-methylpropionate, contacting the propionate with cells of, for example, Pseudomonas in order to effect biological and asymmetric hydrolysis, extracting 3-acetylthio-D-2-methylpropionic acid and allowing the acid to react with L-proline.

Abstract: An optical memory disk hub made essentially of from 7 to 55% by weight of a thermoplastic resin and from 45 to 93% by weight of magnetic powder and/or magnetic fiber.

Abstract: Thermosetting (meth)acrylate molding liquid resin consisting of a specified type of unsaturated oligourethane and alkyl (meth)acrylate within a specified range of ratio. Such a specified type of unsaturated oligourethane may be obtained by reaction between 2-isocyanatoalkyl (meth)acrylate and polyhydric alcohol or by reacting 2-isocyanatoalkyl (meth)acrylate with polyhydric alcohol at molar ratio of functional groups NCO/OH between 1.1 and 1.6 to form a urethane compound and reacting hydroxyalkyl (meth)acrylate with a residual portion of 2-isocyanatoalkyl (meth)acrylate at molar ratio of functional groups OH/NCO between 1.0 and 1.5. This invention also includes molding compositions containing such liquid resin and a specified type of inorganic filler and/or a certain type of thermoplastic high molecular compound as well as molded objects obtained by curing such compositions in a mold.

Abstract: A process for producing a toner resin by a two-step suspension polymerization process, which entails preparing a polymer of high molecular weight having a weight average molecular weight of greater than about 350,000 from at least one monomer having a polymerizable vinyl group using a compound having at least three t-butyl peroxide groups in one molecule, as a polymerization initiator, and then preparing a low molecular weight polymer in the presence of the high molecular weight polymer. A toner having an excellent fixing property and offset resistance can be obtained from the above resin.

Abstract: A heat resistant and impact resistant resin composition is disclosed which composition comprises 5 to 95 parts by weight of a maleimide copolymer (A) prepared by continuous polymerization in the absence of water, containing only small amounts of residual monomers and volatile components, and having a Mw/Mn of not greater than 3, a yellow index of not greater than 30, and an intrinsic viscosity of 0.3 to 1.5, and 5 to 95 parts by weight of a rubber-reinforced resin (B).

Abstract: A process is disclosed for producing carbon fibers with modified surfaces by electrolytic treatment. In the process, electric current is passed between carbon fibers and a counter electrode in an electrolytic solution to which an aromatic compound having at least one hydroxyl group and/or amino group is added.

Abstract: A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2% to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having(a) a molecular weight (Mw) of greater than 50,000 and less than 200,000 as measured by GPC, and(b) an amount of amide segments in the polymer of less than 5% by weight. The methacrylimide containing polymer has excellent transparency and heat resistance, as well as a low yellowness and aging coloration under heating.

Abstract: A methacrylimide containing polymer which is a thermoplastic polymer comprising from 2 to 100% by weight of a structural unit represented by the general formula: ##STR1## where R represents a hydrogen atom or an aliphatic group, aromatic group or cycloaliphatic hydrocarbon group with 1 to 20 carbon atoms and from 0 to 98% by weight of a structural unit derived from as ethylenic monomer, the polymer having(a) a molecular weight (Mw) of greater than 50,000 and less than 200,000 as measured by GPC, and(b) an amount of amide segments in the polymer of less than 5% by weight. The methacrylimide containing polymer has excellent transparency and heat resistance, as well as a low yellowness and aging coloration under heating.

Abstract: A photopolymerizable composition comprising a vinylic compound, a sulfur-containing compound and an .alpha.-diketone is disclosed. The sulfur-containing compound may be a mercaptobenzoic acid or a polysulfide.

Abstract: A resin for toner containing fine particles with a particle size passing through a 200 mesh sieve of not greater than 10% by weight.

Abstract: A vinyl chloride resin composition having excellent impact resistance even at a low temperature and good weather resistance is disclosed. Such vinyl chloride resin composition comprises:(A) a vinyl chloride resin, and(B) a compound rubber type graft copolymer wherein one or more vinyl monomers are graft-polymerized onto a compound rubber that has an average particle diameter of 0.08 to 0.6 .mu.m and possesses such a structure that 1 to 99 wt. % of a polyorganosiloxane rubber component and 1 to 990 wt. % of a polyalkyl (meth)acrylate rubber component are entangled in an inseparable fashion, and the total amount of the polyorganosiloxane rubber component and the polyalkyl (meth)acrylate rubber component is 100 wt. %.

Abstract: An impact-resistant resin composition having excellent impact resistance, weather resistance, surface appearance and wear characteristics is disclosed.The resin composition comprises:(A) a compound rubber type graft copolymer wherein at least one vinyl monomers is graft-polymerized onto a compound rubber that has an average particle diameter of 0.08 to 0.6 .mu.m and possesses such a structure that 10 to 90 wt. % of a polyorganosiloxane rubber component and 10 to 90 wt. % of a polyalkyl (meth)acrylate rubber component are entangled in an inseparable fashion, and the total amount of the polyorganosiloxane rubber component and the polyalkyl (meth)arcylate rubber component is 100 wt. %; and(B) a vinyl polymer obtained by polymerizing 70 to 100 wt. % of at least one vinyl monomer selected from the group consisting of aromatic alkenyl compounds, vinyl cyanide compounds, and alkyl (meth)acrylates with 0 to 30 wt. % of other vinyl monomer copolymerizable with them.

Abstract: A polyester resin for toner, which consists essentially of (a) from 0.5 to 50 mol %, based on the entire alcohol components, of at least one trihydric or higher polyhydric alcohol, (b) from 50 to 99.5 mol %, based on the entire alcohol components, of at least one diol and (c) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, and which has a softening temperature of from 90.degree. to 170.degree. C., a glass transition temperature (Tg) of from 30.degree. to 70.degree. C., an acid value of from 0.5 to 15 mgKOH/g and a gel content of from 1.5 to 40%.

Abstract: A dental adhesive composition containing as major components:(a) at least one isocyanate-group-containing urethane prepolymer,(b) at least one isocyanate-group-containing silane compound,(c) at least one radical-polymerizable unsaturated monomer, and(d) at least one initiator selected from the group consisting of redox polymerization initiators and photopolymerization initiatorsis disclosed.This composition is excellent in bonding properties when it is used to bond a living dental tissue with a restoring material such as a metal, organic polymer, and ceramic. Also, this adhesive composition does not require a troublesome pretreatment of the restoring material with an etching agent such as phosphoric acid when the restorating material is required to bond to the living tissue.

Abstract: A thermoplastic resin composition comprising 0.01 to 10 parts by weight of at least one ultraviolet ray absorbent having a peak absorption wavelength at 240-300 nm in the range of 240-400 nm and 100 parts by weight of methacrylimide group-containing polymer containing at least 5% by weight of imide ring structural unit expressed by the following structural formula is disclosed: ##STR1## (wherein R.sub.1 is a hydrogen atom, or a substituted or non-substituted alkyl group having 1-20 carbon atoms, cycloalkyl group, aryl group, alkalyl group, alalkyl group, or allyl group.)This composition has an improved weather durability and thermal resistance as well as light transmittance.

Abstract: A photopolymerizable dental composition, which comprises:(A) an organic composite filler obtained by polymerizing at least one carboxylic acid monomer of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a --COOY group, a halogen atom, or a phenyl group or a derivative thereof; R.sub.2 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a --COOZ group, a halogen atom, or a phenyl group or a derivative thereof; R.sub.3 is a hydrogen atom, a C.sub.1 -C.sub.15 alkyl group, a halogen atom, or a phenyl group or a derivative thereof; and each of X, Y and Z is a hydrogen atom, NH.sub.4 or an alkali metal atom; or the formula: ##STR2## wherein each of R.sub.4 and R.sub.5 is a hydrogen atom, a C.sub.1 -C.sub.

Abstract: A thermoplastic resin composition, comprising:(A) 20-95% by weight of a methacrylimide group-containing resin polymer containing at least 5% by weight of an imide ring structural unit expressed by the structural formula (I) ##STR1## (wherein R.sub.1 is a hydrogen atom or a substituted or non-substituted alkyl group having 1-20 carbon atoms, cycloalkyl group, aryl group, alkaryl group or an aralkyl group or allyl group);(B) 2.5-30% by weight of at least one thermoplastic elastomer selected from the group consisting of polyether esters, polyether ester amides and polyether amides; and(C) 2.5-50% by weight of a graft-copolymer obtained by graft-polymerizing at least one monomer selected from the group consisting of vinyl cyanate monomer, aromatic vinyl monomer and acrylic vinyl monomer to a butadiene rubber,is disclosed. This composition has balanced properties in heat resistance, impact strength and moldability.

Abstract: A thermoplastic resin composition comprising:(A) 1-99 parts by weight of polymethacrylimide and(B) 99-1 parts by weight of ethylene-ethyl acrylate copolymer, polyamide-imide, polyether-ether ketone, or polyether sulfone. The thermoplastic resin composition has a high impact strength as well as good processability.