Dic Corporation

Dainippon Ink and Chemicals, Incorporated

Other

Research Triangle Institute

Sony Corporation

Satoshi Idemura

Katsuji Takahashi

Michiya Nakashima

Kenji Sugo

Yoshio Ohashi

Masaru Uryu

Kunihiko Tokura

Tomoyuki Uezono

Kazutoshi Haraguchi

Jack Preston

Hiroshi Katsube

Toshihiro Ebine

Munekazu Hayashi

Masanori Fujimaki

Atsuo Kobayashi

Toshikazu Ohtake

Kazumi Ohi

Yuji Kunitake

Hiroshi Maru

Masao Yamada

Koichi Fujimoto

Kenji Sugou

The present invention relates to an ink-jet recording ink which can simultaneously achieve long-term preservation stability, high luster, and light fastness of a printed image, and an aqueous pigment liquid dispersion to produce the ink. Moreover, the present invention relates to a production method of the aqueous pigment liquid dispersion. For the aforementioned objects, the applicant provides an aqueous pigment liquid dispersion, including: C. I. pigment green 36 (a); a styrene-acrylic acid type copolymer (b); a basic compound (c); and a wetting agent (d), wherein the styrene-acrylic acid type copolymer (b) has styrene-based monomer units of 60 mass % or more in the total of all the monomer units, an acid value of 120 to 240, and a weight average molecular weight of 6,000 to 40,000, and the mass ratio (b)/(a) is within a range from 0.15 to 0.25.

Aqueous pigment liquid dispersion and ink-jet recording ink, and production method of aqueous pigment liquid dispersion

A production method of an aqueous pigment dispersion liquid of the present invention includes: a kneading step of kneading a mixture including (a) C. I. pigment violet 23, (b) a styrene-acrylic acid-based copolymer with an acid value of 50 to 300 mgKOH/g, (c) an alkali metal hydroxide, (d) water, and (e) a wetting agent, thereby producing a colored, kneaded material; and a dispersion step of dispersing the pigmented, kneaded material in an aqueous medium by using a dispersing machine with media, wherein the mass ratio of (b)/(a) in the kneading step is within a range of 0.15 to 0.45, the mass ratio of (d)/(a) in the first half of the kneading step is within a range of 0.04 to 0.42, and the change in viscosity of materials to be dispersed in the dispersion step is 10% or lower.

Aqueous pigment dispersion liquid and ink-jet recording ink

A yellow water-based pigment dispersion liquid is provided that includes pigment particles dispersed with a significantly small particle size, that has excellent dispersion stability, that causes less precipitation even at low viscosity, and that provides high gloss when the dispersion liquid is used as a main component of inkjet recording ink. In order to produce the water-based pigment dispersion liquid, it is important to add, as a kneading aid, an acetylene glycol surfactant having a specific structure and an HLB value of 8 to 12 to a mixture containing a bis-acetoacetallylide pigment, a styrene-acrylic acid copolymer having an acid value of 145 to 175, a basic compound, and a humectant and then to knead the resultant mixture to obtain a pigment dispersion. By dispersing the pigment dispersion in a water-based medium, a water-based pigment dispersion liquid for inkjet recording having the characteristics above can be produced.

Pigment dispersion, water-based pigment dispersion liquid, and inkjet recording ink and method for producing water-based pigment dispersion liquid

A pigment dispersion of the present invention includes a bisacetoacetarylide pigment (a); a styrene-acrylic acid-based copolymer (b); a basic compound (c); and a wetting agent (d), wherein the wetting agent (d) includes at least one diol compound (e), the diol compound (e) is selected from the group consisting of dipropylene glycol, 2-ethyl-1,3-hexanediol, and 1,2-hexanediol the mass ratio (e)/(a) of the diol compound (e) and the bisacetoacetarylide pigment (a) is within a range from 3/100 to 8/100.

Pigment dispersion, aqueous pigment liquid dispersion, and ink-jet recording ink

The present invention is to provide an orange ink composition for inkjet recording high in color saturation and gloss, while having long storage stability and jet stability, and also to provide an aqueous pigment dispersion mainly composing the ink composition. The aqueous pigment dispersion which contains a styrene-acrylic acid copolymer containing 60% by mass or more of styrene-based monomer units with respect to total monomer components and having an acid value of 130 to 200 and a weight-average molecular weight of 6,000 to 40,000, an alkali metal hydroxide, a wetting agent and C. I. Pigment Red 168 is excellent in storage stability and high in gloss. Further, an ink composition for inkjet recording mainly composing the aqueous pigment dispersion reflects an excellent dispersibility of the aqueous pigment dispersion, thereby having a favorable jettability and excellent light fastness.

Aqueous pigment dispersion and ink composition for inkjet recording

An organic-inorganic composite material is disclosed wherein an inorganic compound is finely dispersed in an organic polymer matrix in nanometer order and the inorganic compound content is large. The organic-inorganic composite material has formability and flexibility of organic materials and features of various metal compounds (such as hardness, catalytic power, insulating property, semiconducting property, electronic conductivity, ionic conductivity, large specific surface area, high heat resistance, wear resistance, and dimensional stability to temperature changes or moisture absorption) at the same time.

Organic-inorganic composite material and method for producing the same

An epoxy resin cured article has a high glass transition temperature and low dissipation factor. An epoxy resin composition from which the cured article can be having excellent solubility in solvents is used to produce the cured articles. A polyester as a curing agent of an epoxy resin composition having an aromatic polyhydroxy coumpound residue including an aryloxycarbonyl group at the molecule of the terminal, an aromatic polyvalent hydrocarbon group residue, and bulky structure, is used. Since the curing agent behaves as a polyfunctional curing agent, a cured article produced therefrom has a high crosslink density. Since highly polar hydroxyl groups are not formed during curing, a cured article has high glass transition temperature and a low dissipation factor. The cured article does not release low molecular weight carboxylic acids though hydrolysis of ester bonds at crosslinked bonds. Since the polyester has a bulky structure, the crystallization of the molecular chain is prevented and the solubility of the epoxy resin composition containing the polyester is excellent.

Epoxy resin composition

A loudspeaker in which the input resistance is improved and the effect of humidity on the playback frequency response is suppressed, and a method for the preparation of the loudspeaker. A sheet-like product, containing glass particles with a particle size of 8 nm to 300 nm and polyamide resin, and prepared by application of a paper-making technique, is used as the diaphragm. The content of the glass particles in the compound material is 5 weight % to 70 weight %. In preparing the diaphragm, a phase of an aqueous solution containing diamine and water glass is contacted with a phase of an organic solution containing a dicarboxylic acid halide to generate a compound material containing glass particles and the polyamide resin. The compound material so prepared is formed into a sheet by a paper-making technique. In the process of the preparation by the paper-making technique, the compound material mixed with other fibrous material may also be used as a starting material.

Loudspeaker and method for the preparation thereof

Loudspeaker diaphragm

Disclosed is a process for producing a glass-polyamide composite comprising bringing into contact or mixing (A) an aqueous solution containing water, water glass, and a diamine and (B) an organic solution containing an organic solvent and a dicarboxylic acid halide to carry out polyamide formation and polycondensation of water glass simultaneously.

Glass-polyamide composite and process for producing the same

Polymer blend materials composed of an aromatic polyamide and flexible polyamide wherein the aromatic polyamide molecules are uniformly dispersed in a matrix of the flexible polyamide which are produced by first blending the flexible polyamide and monomer(s) for the aromatic polyamide in a solvent, then next polymerizing the monomer(s) in the presence of a phosphite compound, resulting in a transparent gel product capable of being fabricated into useful shaped articles without causing marked phase separation observed in polymer blend materials obtained by conventional coagulation method. The in situ formed aromatic polyamide is uniformly dispersed in the flexible polyamide matrix even in fabricated forms, giving improved transparency over the starting flexible polyamide and improved resistance toward chemicals such as acids, especially after heat treatment.

Polymer blend materials composed of an aromatic polyamide and a soluble

A process for producing a prepreg and a process for producing a laminated sheet therefrom are disclosed, the process for producing a prepreg comprising impregnating a fibrous base with an impregnating resin composition essentially comprising (A.sub.1) a room temperature liquid epoxy resin, (A.sub.2) an epoxy resin curing agent, (B.sub.1) a resin containing a polymerizable unsaturated group, (B.sub.2) a room temperature liquid polymerizable vinyl monomer, and (B.sub.3) a polymerization initiator and containing no solvent other than said polymerizable vinyl monomer (B.sub.2), to obtain an impregnated base, and then removing the polymerizable vinyl monomer present in said impregnated base and converting the resin components to the B-stage. The prepreg is tack-free and soft, and the laminated sheet obtained therefrom has improved metal foil peel strength and interlaminar peel strength.

Growing community of inventors

Saitama, Japan

Satoshi Idemura