33results about How to "Deterioration of physical property" patented technology

The present invention provides a highly productive method for manufacturing a water-absorbing resin, the amounts of fine powder and dust of which are small, the amount of residual monomer of which is small, and whose absorption rate is high. That is, the method for manufacturing the water-absorbing resin of the present invention is a method for crosslinking and polymerizing an aqueous solution of an acid-group containing unsaturated monomer, and is characterized in that stationary polymerization is carried out in such a manner that a solid matter is added to the monomer aqueous solution, and an initiation temperature of the polymerization is adjusted to 40° C. or more or a maximum temperature of the polymerization is adjusted to 100° C. or more.

A surface crosslinking treatment method of a water-absorbing resin powder is disclosed that can overcome various problems in production encountered in the production of surface crosslinked water-absorbing resin powders on an industrial scale and can produce a water-absorbing resin powder having excellent physical properties without causing deterioration in physical properties of resin. The surface crosslinking treatment method of a water-absorbing resin powder includes adding a surface crosslinking agent to a water-absorbing resin powder and heat treating the mixture, wherein (1) the water-absorbing resin powder after the heat treatment is stirred and cooled under an air flow; (2) the water-absorbing resin powder after the heat treatment is cooled under an air flow, and at the same time, at least a part of fine particles of the water-absorbing resin powder and/or the residual crosslinking agent is removed by the air flow; or (3) the water-absorbing resin powder after the heat treatment is cooled and simultaneously granulated, and preferably an aqueous solution is added to the water-absorbing resin powder at a temperature of 40-100° C. during the cooling treatment.

The present invention relates to plenum cables jacketed with a composition comprising perfluoropolymer, inorganic char-forming agent, and hydrocarbon polymer, which passes the NFPA-255 burn test.

Provided is a pneumatic tire: which has an inner liner layer formed of a thermoplastic resin or a thermoplastic elastomer composition containing a blend of a thermoplastic resin with an elastomer; and which, despite of this, is free from air inclusion in bead parts and is capable of preventing curing failure attributable to the air inclusion. The pneumatic tire of the present invention includes: a carcass layer laid between a pair of bead parts; an inner liner layer disposed at a tire cavity side of the carcass layer; a tie rubber layer interposed between the carcass layer and the inner liner layer; and chafers for protecting the respective bead parts, an end portion on a tire cavity side of each chafer being inserted between the carcass layer and the inner liner layer. In the pneumatic tire, the inner liner layer is formed of a thermoplastic resin or a thermoplastic elastomer composition containing a blend of a thermoplastic resin with an elastomer; and the tie rubber layer is disposed between the inner liner layer and the chafer.

The invention provides a process for the preparation of a thermoplastic elastomeric resin composition comprising melt kneading(a) 100 parts by weight of a block copolymer consisting of at least two polymeric blocks (A) composed mainly of a vinyl aromatic compound and at least one polymeric block (B) composed mainly of a conjugated diene compound, and/or a hydrogenated block copolymer obtained by hydrogenating said block copolymer,(b) 40 to 240 parts by weight of a non-aromatic softening agent for rubber,(c) 5 to 300 parts by weight of polyethylene or a copolymer composed mainly of ethylene, and(d) 5 to 60 parts by weight of polypropylene or a copolymer composed mainly of propylene,characterized in that the process comprises the following steps:(I) melt kneading the whole amounts of components (a), (b) and (d) and a part of component (c), and, at the same time or subsequently, melt kneading these with (f) an organic peroxide, and(II) melt kneading the product obtained from step (I) with the remaining part of component (c),and component (c) is one which has been prepared using a single site catalyst.The obtained composition is soft and excellent in heat deformation resistance and mechanical strength, moldability and processability. The present invention also provide a thermoplastic elastomeric resin composition comprising the above components (a), (c) and (d) in an amount of 100 parts by weight, 5 to 150 parts by weight and 5 to 80 parts by weight, respectively. The composition is soft and excellent in heat deformation resistance and mechanical strength, moldability and processability and shows good results in the extraction tests.

Provided are a method for forming conductive pattern by direct radiation of an electromagnetic wave capable of forming fine conductive patterns on various kinds of polymer resin products or resin layers by a simplified process, and appropriately implementing the polymer resin products having white color or various colors, and the like, even without containing specific inorganic additives in the polymer resin itself, and a resin structure having the conductive pattern formed therefrom.

The method for forming the conductive pattern by direct radiation of the electromagnetic wave includes: forming a first region having a predetermined surface roughness by selectively radiating the electromagnetic wave on a polymer resin substrate containing titanium dioxide (TiO₂); forming a conductive seed on the polymer resin substrate; forming a metal layer by plating the polymer resin substrate having the conductive seed formed thereon; and removing the conductive seed and the metal layer from a second region of the polymer resin substrate, wherein the second region has surface roughness smaller than that of the first region.

There is provided a polyoxyalkylene-modified vinyl acetal polymer which has polyoxyalkylene groups represented by general formula (I) in side chain, in which a viscosity-average polymerization degree P is 150 to 5000, an acetalization degree is 10 to 85 mol % and a polyoxyalkylene modification rate S is 0.1 to 10 mol %. Such a polymer has a feature that a film or sheet produced therefrom has improved film strength and flexibility, as well as a feature that a resin composition therefrom is free from phase separation.

In durability tests of a moisture-curing composition, it is difficult to both suppress foaming inside of the cured product and to stably maintain the physical properties of the cured products. [Solution] This moisture-curing composition contains components (A)-(D), and contains 0.5-5.0 parts by mass of component (C) per 100 parts by mass of component (A). Component (A): An oligomer which has a polymer of (meth)acrylic monomers as the primary chain and which has a hydrolyzable silyl group in the molecule Component (B): A specific polydialkylsiloxane Component (C): A silicate Component (D): A curing catalyst

To provide an antistatic film, an antistatic foam sheet or an antistatic bubble sheet which has favorable physical properties, such as a continued antistatic effect and a high strength, and which causes little contamination of rollers or other devices when the sheet is formed. The antistatic film according to the present invention is characterized in that it is made of a polyethylene-based resin composition containing a polyethylene-based resin and a high-polymer-type, polyether-based antistatic agent. Furthermore, the antistatic foam sheet and the bubble sheet according to the present invention are characterized in that they are made of a polyolefin-based resin composition containing a polyolefin-based resin and a high-polymer-type antistatic agent.

A method of evaluating dispersion degrees of mixed epoxy resins includes, first, obtaining a resin mixture by mixing a plurality of aromatic epoxy resins, and taking a plurality of measurement samples from a plurality of sites of the resin mixture. The measurement samples are spectroscopically analyzed to obtain the spectra, and a plurality of common functional group peaks in the spectra are selected. The absorbances of the selected peaks are standardized to obtain absorbance ratios, based on the absorbance of a standard peak, in each of the spectra. Then, the standard deviations of the absorbance ratios of the selected peaks are calculated between the measurement samples. The maximum value of the obtained standard deviations is compared with a predetermined threshold value to evaluate the dispersion degrees of the aromatic epoxy resins.

The present invention relates to a coating composition for insulating film production, a preparation method of a low dielectric insulating film using the same, a low dielectric insulating film for a semiconductor device prepared therefrom, and a semiconductor device comprising the same, and more particularly to a coating composition for insulating film production having a low dielectric constant and that is capable of producing an insulating film with superior mechanical strength (elasticity), a preparation method of a low dielectric insulating film using the same, a low dielectric insulating film for a semiconductor device prepared therefrom, and a semiconductor device comprising the same. The coating composition of the present invention comprises an organic siloxane resin having a small molecular weight, and water, and significantly improves low dielectricity and mechanical strength of an insulating film.

The rubber composite was fabricated by use of direct vulcanization adhesion method with a sulfenamide-based vulcanization accelerators, and the sulfenamide-based vulcanization accelerator is used for a rubber composite using a sulfenamide compound as a vulcanization accelerator, the adhesion properties of the steel cord/rubber adhesion boundary surface and the anti-scorch properties can be achieved simultaneously, the sulfenamide-based vulcanization accelerator being such that the bond order between an amine generated form the sulfenamide compound and a surface of a metal material is zero, and the distance of the S—N (amine moiety) bond of the sulfenamide compound is less than 1.67 Å, and the electric charge on N of the amine radical generated as a result of dissociation of the S—N bond is −0.295 or less.

Disclosed herein is a method of preparing a high-melting point flame retardant crystal, comprising the steps of: reacting 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with 1,4-naphthoquinone in an inert solvent having a dielectric constant of 10 or less to reduce a content of by-products, thereby obtaining a reaction composition; and dissolving the reaction composition in any one solvent selected from the group consisting of ethyleneglycol, propyleneglycol, diethyleneglycol, cyclohexanone, benzyl alcohol, acetate ester, benzoate ester and a mixture thereof to recrystallize and refine the reaction composition, thereby obtaining high-melting point retardant crystal, represented by Formula 1, having a start melting point of 280° C. or more and a melting point of 291° C. or more, which are measured by differential thermogravimetric analysis:

The present disclosure relates to a spunbond nonwoven fabric for a tile carpet base fabric which can manufacture tile carpets with excellent sound absorption performance and tuft withdraw force, including high-thickness nonwoven fabrics made of hollow fibers to which recycled polyester raw materials are applied, and a tile carpet using the same.

Provided are a dielectric material, a device including the dielectric material, and a method of preparing the dielectric material, in which the dielectric material may include: a layered perovskite compound, wherein the layered perovskite compound may include at least one selected from a Dion-Jacobson phase, an Aurivillius phase, and a Ruddlesden-Popper phase, a temperature coefficient of capacitance (TCC) of a capacitance at 200° C. with respect to a capacitance at 40° C. may be in a range of about −15 percent (%) to about 15%, and a permittivity of the dielectric material may be 200 or greater in a range of about 1 kilohertz (kHz) to about 1 megahertz (MHz).

A blend of polylactic acid resin and copolyester resin, which has excellent impact resistance and heat resistance, and a molded article manufactured using the same are disclosed. The blend of polylactic acid resin and copolyester resin, comprises 5 to 94 wt % of a polylactic acid resin; 3 to 92 wt % of a copolyester resin comprising a dicarboxylic acid component, which contains a terephthalic acid residue, and a diol component which contains 3 to 99 mol % of a cyclohexanedimethanol residue and 1 to 60 mol % of an isosorbide residue; and 3-30 wt % of a compatibilizer containing at least one reactive functional group selected from the group consisting of glycidyl, maleic anhydride, epoxy, isocyanate, amino, carboxylic acid and oxazoline groups, and mixtures thereof.

A bio-based polycarbonate ester and a method for making the bio-based polycarbonate are disclosed. The bio-based polycarbonate ester has excellent mechanical properties, such as tensile strength and impact strength. The method produces the bio-based polycarbonate ester using a high-viscosity polycondensation reactor.