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 (I): ##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 an ethylenic monomer, in which a distribution range of an imidization radio of the polymer is less than 5%. The methacrylimide containing polymer has excellent transparency and heat resistance.

Abstract: A photopolymerizable dental composition, which comprises:(A) an organic composite filler obtained by polymerizing a sulfonic acid or sulfonate monomer of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom, a C.sub.1 -C.sub.20 alkyl group, a phenyl group or a derivative thereof, or a halogen atom; ##STR2## wherein each of R.sub.2 and R.sub.3 is a hydrogen atom or a C.sub.1 -C.sub.15 alkyl group, R.sub.4 is a C.sub.1 -C.sub.15 alkylene group, m is an integer of from 1 to 20 and n is an integer of from 0 to 20; and Y is a hydrogen atom, NH.sub.4 or an alkali metal atom, and at least one radical polymerizable vinyl monomer in a polymerization system in which an inorganic compound is dispersed;(B) a monomer mixture comprising 2,2-bis[4-(methacryloxyethoxy)phenyl]propane, at least one hexa-functional urethane (meth)acrylate of the formula: ##STR3## wherein X is ##STR4## wherein n is an integer of from 1 to 10, and each of R.sub.1 and R.sub.

Abstract: A thermoplastic polyester resin composition comprising from 10 to 80% by weight of a thermoplastic polyester (A); from 5 to 55% by weight of a compound rubber type graft copolymer (B) having at least one vinyl monomer graft-polymerized onto a compound rubber composed of from 10 to 90% by weight of a polyorganosiloxane rubber and from 10 to 90% by weight of a polyalkyl (meth)acrylate rubber in a total amount of 100% by weight in an inseparably interlocking fashion and having an average particle size of from 0.08 to 0.6 .mu.m; from 5 to 70% by weight of a thermoplastic polyester elastomer (C); and from 0 to 60% by weight of a filler (D), with the total amount of components (A) to (D) being 100% by weight.

Abstract: A polycarbonate resin composition comprising a polycarbonate resin (A) or a mixture (A') of a polycarbonate resin with a saturated polyester resin and/or a polyester elastomer, and a compound rubber type graft copolymer (B) having at least one vinyl monomer graft-polymerized onto a compound rubber composed of from 10 to 90% by weight of a polyorganosiloxane rubber and from 10 to 90% by weight of a polyalkyl (meth)acrylate rubber in a total amount of 100% by weight in an inseparable interlocking fashion and having an average particle size of from 0.08 to 0.6 .mu.m, or a mixture (B') of such a compound rubber type graft copolymer (B) with a vinyl monomer, wherein component (B) or (B') is in an amount such that the compound rubber is from 0.5 to 60% by weight based on the entire resin composition.

Abstract: A process for producing a low gloss thermoplastic resin which comprises polymerizing in two steps from 20 to 70 parts by weight of a butadiene polymer, at least 70% by weight of which is constituted by butadiene, with from 30 to 80 parts by weight of a total of from 15 to 40% by weight of a vinyl cyanide monomer and from 60 to 85% by weight of an aromatic vinyl monomer, characterized in that for the polymerization of the first step, the butadiene polymer, the vinyl cyanide monomer and the aromatic vinyl monomer were charged in amounts corresponding to from 20 to 80% by weight of the entire butadiene polymer, from 20 to 80% by weight of the entire vinyl cyanide monomer and from 20 to 80% by weight of the entire aromatic vinyl monomer, respectively, and after the completion of the polymerization of the first step, the rest of the butadiene polymer, the vinyl cyanide monomer and the aromatic vinyl monomer were charged for the polymerization of the second step.

Abstract: A polyester resin for toner, which consists essentially of (a) from 5 to 60 equivalent %, based on the entire carboxylic acid components, of at least one member selected from the group consisting of tribasic and higher polybasic carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol, and which has a softening temeprature of from 100.degree. to 170.degree. C., a glass transition temperature (Tg) of from 50.degree. to 70.degree. C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%.

Abstract: Methacrylimide-containing polymers are continuously produced by introducing 10 to 60 wt. % of an inert solvent, 90 to 40 wt. % of methacrylic acid, a methacrylic acid ester or a monomer mixture comprising at least 50 wt. % of methacrylic acid or a methacrylic acid ester, and a radical polymerization initiator and a molecular weight modifier into a polymerization reaction zone, converting at least 80 wt. % of the charged monomer to a polymer at 60.degree.-170.degree. C., adding a compound represented by the formula:R--NH.sub.2wherein R represents a hydrogen atom, an alkyl group having 1-12 carbon atoms, a cycloalkyl group having 7-11 carbon atoms or an aryl group having 6-10 carbon atoms,to the polymerization reaction liquid, carrying out reaction of the resulting mixture at 150.degree. to 300.degree. C. in an imidization reaction zone, and finally separating volatile substances from the reaction fluid.

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 thermoplastic resin composition comprising:(A) from 15 to 90 parts by weight of a polycarbonate resin;(B) from 10 to 85 parts by weight of a multi-stage graft copolymer obtained by graft polymerizing from 2 to 50 parts by weight of an acrylate monomer (b) as a monomer for the first stage graft polymerization, in the presence of from 15 to 80 parts by weight of a rubbery polymer (a) of which at least 50% by weight is constituted by butadiene units and then graft polymerizing from 18 to 83 parts by weight of vinyl monomers (c) comprising from 25 to 85% by weight of an aromatic vinyl monomer (i), from 15 to 40% by weight of a vinyl cyanide monomer (ii) and from 0 to 35% by weight of another vinyl monomer (iii) copolymerizable with these monomers, as monomers for the second stage or subsequent graft polymerization, the total amount of the monomers (i) to (iii) being 100% by weight, and the total amount of components (a) to (c) being 100 parts by weight; and(C) from 0 to 60 parts by weight of a polymer obtained

Abstract: A thermoplastic resin composition comrpising:(A) from 5 to 50 parts by weight of a graft copolymer obtained by graft polymerizing from 20 to less than 40 parts by weight of monomers comprising from 20 to 80% by weight of an .alpha.-alkyl aromatic vinyl monomer, from 3 to 40% by weight of an aromatic vinyl monomer containing no .alpha.

Abstract: An electrostatic recording material comprising a substrate treated for low electric resistance and a dielectric layer formed on the substrate and composed of a composition comprising an insulating resin having a volume specific resistance of at least 10.sup.12 .OMEGA.cm and a powder of an acrylonitrile-type polymer having a copolymerized acrylonitrile content of at least 95% by weight and containing substantially no ionic groups, said powder having a volume average particle size of from 1.5 to 4 .mu.m and a content of particles having a size exceeding 8 .mu.m as measured by a particle size distribution measuring apparatus, being at most 0.02% by number.

Abstract: A coating composition comprising (A) 100 parts by weight of an acrylic copolymer and (B) from 0 to 40 parts by weight of a curing agent, wherein said acrylic copolymer is a copolymer of a monomer mixture composed essentially of:(1) from 1 to 50% by weight of 1,4-butanediol mono(meth)acrylate,(2) from 0.2 to 10% by weight of an .alpha.,.beta.-monoethylenic unsaturated carboxylic acid, and(3) from 40 to 98.8% by weight of other copolymerizable monomers,provided that the total of the 1,4-butanediol mono(meth)acrylate and hydroxyl group-containing monomers in the copolymerizable monomers, is not more than 50% by weight of the monomer mixture.

Abstract: An ultraviolet curable ink composition comprising, as main components,(A) a polyurethane poly(meth)acrylate obtained by reacting a polyisocyanate compound of the formula: ##STR1## wherein R.sub.1 is a hydrogen atom or a methyl group, and n is an integer of from 1 to 20, with a hydroxyl group-containing (meth)acrylate, and having, in one molecule, at least two (meth)acryloyl groups and at least two urethane bonds,(B) a radical polymerizable low molecular weight compound, and(C) a photopolymerization initiator.

Abstract: A thermoplastic resin composition having excellent heat resistance, impact resistance, moldability and platability, which comprises:(i) from 10 to 90% by weight of a thermoplastic polycarbonate;(ii) from 10 to 90% by weight of a graft copolymer obtained by firstly polymerizing a monomer mixture comprising more than 30 and not more than 50% by weight of acrylonitrile and at least 50 and less than 70% by weight of styrene, as monomers for the first stage of graft polymerization, in the presence of a rubber-like polymer, and then polymerizing a monomer mixture comprising from 15 to 40% by weight of acrylonitrile and from 60 to 85% by weight of .alpha.

Abstract: Organic carboxylic acid ester represented by the formula (II): ##STR1## wherein R.sub.1 is an alkyl, an aralkyl or an aryl group; R.sub.2 is an alkyl group; R.sub.3 is an alkyl group; n is 1 or 2, are synthesized in racemic form, and then the acid ester (II) is treated with a source containing enzyme capable of rearranging with or without asymmetrically hydrolyzing ester bond until either a d-form or 1-form optically active carboxylic acid ester represented by the formula (II) with or without the antipode acid thereof is produced.

Abstract: Apparatus for stirring hydrogel particles of a water-soluble polymer made as a tank defined by a drum within which is housed an inner drum. Water-soluble polymers are introduced through a top opening in the tank into an annular space defined by the inner wall surfaces of the tank and the outer wall surfaces of the inner drum. The water-soluble polymer contents in the annular space are stirred by vanes mounted on a corresponding vertically disposed driven arms. The vanes have leading surfaces advanced in different circular paths within the annular space. One of the vane stirring arms and vane thereon is disposed to travel along a circular path in the vicinity of the inner surfaces of the tank and the other stirring arm vane and corresponding vane are advanced along a circular path in the vicinity of the outer wall surfaces of the inner drum.

Abstract: A flame resistant acrylic resin composition comprising a polymer composed of from 40 to 88% by weight of methyl methacrylate, from 1 to 15% by weight of .alpha.-methyl styrene, from 5 to 15% by weight of styrene, from 5 to 15% by weight of maleic anhydride and from 1 to 15% by weight of methacrylic acid, and a flame retardant.

Abstract: Disclosed is a resin composition which is usable for an exterior article without being coated on its surface when molded into the article and is excellent in the color tone and has good impact resistance and weatherability, said composition comprising (I) 10 to 70% by weight of a high-rubber-content graft polymer obtained by polymerizing 50 to 10% by weight of a monomer mixture (C) comprising 10 to 90% by weight of at least one aromatic vinyl monomer and 90 to 10% by weight of at least one ethylenically unsaturated monomer represented by the following general formula:CH.sub.2 .dbd.CRXwherein R stands for a hydrogen atom or methyl group, and X stands for a group --CN or --COOR.sub.1 in which R.sub.1 stands for an alkyl group having 1 to 8 carbon atoms, in the presence of a latex of a multi-layer crosslinked acrylic rubber particles containing 5 to 30% by weight of a rigid crosslinked resin (A) having a core particle size of 0.15 to 0.40.mu.

Abstract: Medical appliances are continuously packed for sterilization thereof by the process wherein (1) bags having micropores in peripheral side portions thereof to be sealed, which micropores allow passage of a sterilizing gas and a high pressure steam but do not allow passage of germs, are formed from packing sheets; (2) medical appliances are inserted into the bags while the bags are formed; (3) all the peripheral side portions of the bags are sealed; and (4) the sealed bags containing the packed medical appliances are separated into packages each having the packed medical appliance.

Abstract: A process for improving the operating characteristics of a phosphorous-, molybdenum-, and oxygen-containing catalyst used for the production of an unsaturated carboxylic acid by gas phase catalytic oxidation of a corresponding unsaturated aldehyde, comprising the step of calcinating the catalyst at a temperature of 300.degree.-500.degree. C. while a gas containing 0.05-3 vol. % of ammonia and/or steam is passed over the catalyst.