The invention is related with the paint industry to use on surfaces of solid materials. The invention is a process to obtain paints using expanded polystyrene (EPS) waste as a raw material. From this technology we pursue to transform a waste into a useful product, saving resources and at the same time contributing to solve environmental contamination problems. This invention is composed by the following stages, a.-mixing the EPS waste with an organic solvent until reaching a concentration between 20% and 80% p/p; decanting impurities of the mixture obtained in stage (a) during 24 to 120 h; c.-collecting the supernatant obtained in stage (b); d.-dispersing a pigment in the supernatant obtained in stage (c) during 10 to 30 min at a velocity between 1.000 rpm and 2.000 rpm; e.-mixing the substance obtained in stage (d) with an organic solvent at a velocity between 300 rpm and 1.000 rpm until reaching the desired concentration. Additionally, the invention claims the formulation of a paint that is formed by 0% to 40% of pigment, 70% to 1% of EPS, 0.5% to 5.0% of dispersant, and the difference is solvent.

The method prepares an aqueous pigment dispersion. The method includes the following steps: providing a silica liquid including a hydrophilic fumed silica, potassium hydroxide and ion exchanged water; providing a styrene-acrylic acid copolymer obtained by copolymerizing monomers including a styrene monomer at an amount of 50 to 90 mass %; providing an aqueous medium; mixing a pigment with the styrene-acrylic acid copolymer and the aqueous medium to prepare a first mixture; and subsequently mixing the first mixture with the silica liquid to prepare the aqueous pigment dispersion.

Provided is a pigment dispersion liquid used in a curable composition capable of manufacturing a film having fewer foreign matters. Provided are a curable composition capable of manufacturing a film having fewer foreign matters, a film, a near infrared cut filter, a solid-state imaging element, an image display device, and an infrared sensor. The pigment dispersion liquid includes a near infrared absorbing organic pigment having an maximum absorption wavelength in a wavelength range of 600 to 1,200 nm; two or more kinds of pigment derivatives having different structures; and a solvent.

The present application provides a polyimide powder in which a conductive filler is uniformly dispersed within particles, and a polyamic acid varnish that is prepared from the powder and capable of implementing a polyimide molded article that not only has excellent moldability and processability, but also has excellent conductivity, tensile strength, elongation, and elastic modulus.

The present invention is a method for producing an aluminum flake paste including a first step of flaking a raw material aluminum powder in an organic solvent containing an aromatic hydrocarbon as a main ingredient to give aluminum flakes, and a second step of treating the aluminum flakes obtained in the first step with an organic compound having a polar group, and forming the treated flakes into a paste.

Provided are a dispersion liquid and a composition which have excellent particle dispersibility and make it possible to manufacture a film having a high color valency. Also provided are a film, a manufacturing method of a film, and a dispersant. The dispersion liquid contains particles, a solvent, and a dispersant. The dispersant has a particle adsorption portion and a solvophilic portion, and the solvophilic portion includes a moiety which is decomposed or denatured by an external stimulus.

A method for producing a multicoat coating (M) on a substrate (S) that includes:(!) producing a basecoat (B) on the substrate by applying an aqueous basecoat material (b) to the substrate (S), the basecoat material being a two-component coating composition, and (II) producing a clearcoat (K) directly on the basecoat (B) by applying an aqueous clearcoat material (k) directly to the basecoat (B), the clearcoat material being a two-component coating composition.

A dispersion that inorganic oxide microparticles may be dispersed at a high concentration in a solvent, a composition for film formation having high transparency, high refractive index and adhesion to a base layer. Inorganic oxide microparticles wherein an amphiphilic organosilicon compound having one or more selected from a polyoxyethylene group, a polyoxypropylene group, or a polyoxybutylene group as a hydrophilic group, and one or more selected from a C.sub.1-18 alkylene group or a vinylene group as a hydrophobic group bonded to a surface of modified metal oxide colloidal particles (C) having a primary particle diameter of 2 to 100 nm, the modified metal oxide colloidal particles wherein a surface of metal oxide colloidal particles (A) having a primary particle diameter of 2 to 60 nm as a nucleus is coated with a coating material (B) including metal oxide colloidal particles having a primary particle diameter of 1 to 4 nm.

A composition includes a plurality of pigment particles including a metal oxide, a polymeric first dispersant, and a second dispersant including molecules having a lower molecular weight than the first dispersant. The composition may be used in a hardcoat.

A polymer having N-functional imide groups is prepared from reactants that include: (a) an ethylenically unsaturated anhydride or diacid monomer; (b) at least one co-monomer that is different from (a) having an ethylenically unsaturated group that is reactive with (a); and at least one compound reactive with the anhydride or diacid functional groups of (a) that is represented by Chemical Formula I: H.sub.2NR.sup.1. With respect to Chemical Formula I, R.sup.1 is selected from NH.sub.2 or OH. Pigment dispersions and coating compositions are also prepared with the polymers having N-functional imide groups.