1067 results about "Latex particle" patented technology

The invention provides a fluorine-silicon modified self-crosslinking acrylic ester emulsion and a preparation method thereof, belonging to the technical field of polymer synthesis. The emulsion is a product formed by organosilicon monomers, fluoride-containing acrylic monomers, (methyl) acrylic monomers and self-crosslinking monomers through core-shell emulsion polymerization. The preparation method adopts a core-shell emulsion polymerization method, thereby ensuring that the fluoride-containing acrylic monomers tend to surface polymerization, and fluorine atoms tend to polymer surface in emulsion film forming process; moreover, the monomers capable of self-crosslinking is added to a shell layer, so as to utilize the crosslinking of the monomers to fixedly limit the migration of the fluorine atoms towards the inside of latex particles, as well as the swing of chains, thereby ensuring that the performances of the fluoride-containing emulsion are completely embodied. The preparation method improves the water resistance, stain resistance, solvent resistance, weather resistance and other comprehensive performances of the emulsion. The fluorine-silicon modified self-crosslinking acrylic ester emulsion prepared through the preparation method can be widely applied to high-grade building paint, industrial paint and wooden ware varnish. Moreover, the preparation method has the characteristics of simple manufacturing process, easy reaction condition control, good emulsion stability and environment-friendly property.

A method has been disclosed of preparing ultrafine hydrophobic latex particles of polymers and copolymers by free radical emulsion polymerization in a water-based system, making use therefor, in order to polymerize or copolymerize monomers or monomer mixtures respectively, of at least one compound selected from the group consisting of dimers and cobalt complexes, acting as a chain transfer agent (CTA), wherein said latex particles have an average particle size of less than 100 nm, being more than 10% lower than if prepared in the absence of said CTA, characterized in that said polymerization is conducted in a water-based reaction in the presence of a chain transfer agent and of a surfactant, wherein said surfactant is present in a concentration versus said monomer or monomer mixture of from 5 up to 25% by weight for a non-ionic surfactant or from 0.05 up to 10% by weight for an ionic surfactant, more particularly a surfactant in a concentration below twice its critical micelle concentration.

The invention discloses an immunochromatographic test strip for full quantitative detection of C-reactive protein and a preparation method thereof. The test strip is composed of a sample pad, a mark pad, a coating film and absorbent paper which are successively overlapped and adhered on a baseplate, wherein the mark pad is coated with C-reactive protein (CRP) monoclonal antibody labelled by fluorescent latex particles and rabbit IgG labelled by fluorescent latex particles; and the coating film is composed of a detection region and a quality control region, and the detection region is coated with another CRP monoclonal antibody which is at different epitope with the CRP monoclonal antibody labelled by fluorescent latex particles. The C-reactive protein immunochromatographic test strip can perform sensitive quantitative detection on the full CRP in 10 seconds, can diagnose diseases and identify infection more rapidly and accurately, and can detect infectious illness state and determine the curative effect of antibiotics; and the full CRP has two detection results, namely hs-CRP and conventional CRP, comprehensive linear range and good detection sensitivity and less required sample amount, and is very convenient to operate.

The invention relates to a kit for determination of human alpha-fetoprotein content by a latex-enhanced immunoturbidimetry. The kit provided by the invention comprises an alpha-fetoprotein R1 reagent, an alpha-fetoprotein R2 reagent and an alpha-fetoprotein calibrator, wherein the alpha-fetoprotein R1 reagent comprises one or more electrolytes, a coagulation accelerator, one or more stabilizing agents, one or more surfactants, an antiseptic and a buffer solution; the alpha-fetoprotein R2 reagent comprises latex particles coated by polyclonal antibodies capable of resisting a human alpha-fetoprotein, one or more electrolytes, one or more stabilizing agents, one or more surfactants, an antiseptic and a buffer solution; and the alpha-fetoprotein calibrator comprises an antiseptic, one or more electrolytes, one or more stabilizing agents, alpha-fetoprotein antigens and a buffer solution. The kit has strong specificity and high sensitivity, is homogeneous and stable, can be used fast and conveniently and can be used for various biochemical analyzers.

The invention relates to a latex enhanced immunoturbidimetry kit for the detection of asymmetric dimethylarginine content. Specifically, the invention relates to a latex enhanced immunoturbidimetry kit for the detection of asymmetric dimethylarginine (ADMA) content in human blood samples. The kit comprises a mouse anti-human monoclonal antibody solution, an ADMA-human Serum albumin complex crosslinked latex particle expansion and an ADMA calibrator. According to the method, by the utilization of competitive binding of free ADMA in blood and ADMA crosslinked on the surface of latex particles to ADMA monoclonal antibody, turbidity formed by the reaction between the ADMA-crosslinked latex particles and ADMA monoclonal antibody is reduced. Therefore, the content of ADMA is detected through the reduction degree of turbidity. The kit provided by the invention can be applied in a biochemical analyzer commonly-used in clinic, is convenient and rapid to operate and has strong specificity. Both sensitivity and detection range of the kit can satisfy clinic application needs.

The invention relates to an organic silicon modified acrylic ester aqueous wood lacquer latex and a synthesizing method thereof. The organic silicon modified acrylic ester latex has a three-layer nuclear shell structure latex particle with a hard core and a soft shell, can carry out self crosslinking at room temperature and has the particle diameter of 80-200nm, the solid content of 40-50 percentand the lowest film forming temperature of lower than 40 DEG C. The latex is prepared in such a way that a dicarbonyl compound containing double bonds and a (methyl) acrylic ester crosslinking monomercontaining double functionality or/and polyfunctionality, which can realize a room temperature crosslinking function are led in the polymerization process of acrylic ester nuclear shell latex, and anorganic silicon prepolymer is led in the outermost layer of the shell. The polymerization technology is simple and practical without gel generation in the polymerization process, and the storage stability of the latex can reach more than one year. The synthesized latex can generate an interpenetrating network structure and a self-layering structure during film formation. When the latex is appliedas aqueous wood lacquer, the pencil hardness of a lacquer film is larger than and equal to 2H, and the latex has favorable adhesive force, flexibility, scratch resistance, water resistance, oil resistance and fouling prevention.

The present invention relates to an aqueous binder used in lithium ionic cell electric pole material and the preparation method thereof, which belongs to lithium ionic cell electric pole material preparation field. The present invention aims to provide an aqueous binder for producing lithium ionic cell positive and negative plate with adjustable flexibility, and can meet all electric pole material aqueous binder requirements under various conditions of lithium ionic cell production and processing, storage and usage. The aqueouspolymer latex particle emulsion has an inside soft and outside hard core-shell structure with low polar polymer as core and high polar polymer as shell, and the solid content of the emulsion is 5-40 wt%, the mass percentage of low polar polymer is more than 0 and smaller than or equal to 95% in the core-shell structure. The lithium ionic cell produced according to the invention is provided with high capacity exertion of electroactive material, long battery periodic duty life and high voltage of discharge platform.

The invention discloses an environmental-friendly microemulsion interpenetrating network pigment printing binding agent and a manufacturing method, and is made of a soft monomer, a hard monomer, a functional monomer, an emulsifying agent, an initiator and deionized water; latex particle of the interpenetrating network pigment printing environmental-friendly binding agent manufactured by the invention is distributed evenly and the product quality is stable; by using the binding agent to carry out pigment printing, the feel is good and the color fastness is high; formaldehyde is not released in the process of subsequent processing, thus meeting the requirement of environmental protection.

The invention relates to a double antibody latex enhanced retinol binding protein detection kit. More specifically, the invention discloses a double antibody coating latex enhanced immunoturbidimetry kit for detecting retinol binding protein. The kit contains a reagent 1, a reagent 2 and a calibrator. Paring monoclonal antibody A and B are respectively coated on latex particles. Coated antibody is bonded with RBP to be detected, and a plurality of bonders are aggregated together to form detectable turbidity change. The detection kit provided by the invention has high sensitivity, can be used to detect urine samples and serum samples and can be used as nutritive index to detect RBP in serum. Simultaneously, through the detection of RBP in urine, the kit is sensitive to the damage degree of renal proximal tubule.

The invention relates to a liquid double-reagent kit for measuring free light chains in serum or urine by a double-latex method. The kit provided by the invention comprises a reagent R1, a reagent R2 and a light chain antigen calibrator with known concentration, wherein the reagent R1 comprises a macromolecular accelerant, a preservative, a surface active agent, a reaction promoter, a stabilizer, an electrolyte and a buffer solution; R2 comprises two types of latex particles with different diameters, wherein the diameters of the latex particles are respectively in ranges from 40nm to 80nm and from 100nm to 200nm; the two types of latex particles are both cross linked with kappa-type or lambda-type anti-FLC (full-load current) polyclonal antibody, and the latex particles comprise the preservative, the surface active agent, the reaction promoter, the electrolyte, the stabilizer and the buffer solution; the light chain antigen calibrator with known concentration comprises the preservative, the electrolyte, the stabilizer, kappa-type or lambda-type FLC antigen and the buffer solution. The kit in the invention has the advantages that the specificity is strong, the sensitivity is high, the linear range is wide, the operation is simple, and the kit is suitable for various full automatic biochemical analyzers.

The invention relates to self-layering organic-inorganic nano composite emulsion and a method for preparing the same. The emulsion is made of mixed monomers, inorganic components and auxiliary components. The self-layering organic-inorganic nano composite emulsion is obtained by generating (or precipitating) organic nano particles inside (or on the surface) of latex particles in situ while introducing double-bond polysiloxane, and the emulsion is high in solid content, low in viscosity and high in storage stability. Due to differences of surface energy and compatibility (solubility parameters) between polysiloxane and other components in filming of emulsion, the polysiloxane molecules migrate to be enriched to a coating surface to form a self-layering structure.

Topically applicable cosmetic/dermatological UV protection compositions having enhanced SPF contain at least one organic UV screening agent and/or at least one inorganic screening agent, such compositions also containing at least the following constituents (A) and (B):

• • A) a semi-crystalline polymer which is solid at ambient temperature and has a melting point of greater than or equal to 30° C., containing a) a polymeric backbone and b) at least one crystallizable organic side chain and/or one crystallizable organic block forming part of the backbone of this said polymer, said polymer having a number-average molecular mass Mn of greater than or equal to 1,000, and
  • B) hollow latex particles having a particle size ranging from 150 to 380 nm, formulated into a topically applicable, physiologically acceptable medium therefor.

The invention discloses a graphene elastomer nano composite material with low filling quantity and a preparation method thereof, which belong to the technical field of preparation of dielectric elastomer. The preparation method comprises the following steps of: adding an aqueous solution of graphene oxide into water-soluble rubber latex so that the graphene oxide is dispersed in rubber matrix on molecular level, reducing the graphene oxide into graphene by adopting an in-situ hot-pressing reduction method, and thus forming a network structure that graphene flake layers wrap latex particles. The obtained composite material has high dielectric constant under low filling quantity, keeps low dielectric loss, and has low percolation value. The composite material solves the problem that the performance of the composite material is reduced because the filling quantity required when an inorganic conductor is filled with rubber and the dielectric constant and the dielectric loss are simultaneously improved.

This invention relates to preparation and use of nanocomposites comprised of an elastomer matrix which contains a dispersion therein of at least partially exfoliated platelets of an intercalated, multilayered, water swellable clay (e.g. montmorillonite clay). The exfoliated platelets are derived from such intercalated clay formed by an in situ cation exchange phenomenon between cationically exchangeable ions within the galleries between the layers of the multilayered clay with a preformed latex of cationic (positively charged) elastomer particles. Said positively charged latex elastomer particles may be prepared by free radical emulsion polymerization using: (A) a non-polymerizable cationic surfactant, and/or (B) a polymerizable cationic surfactant. Optionally, an additional cationic charge may be incorporated onto the cationic elastomer latex particles through the use and in the presence of: (C) a polymerizable comonomer bearing a cationic charge, (D) a free radical generating polymerization initiator bearing a cationic charge, and/or (E) a free radical chain transfer agent bearing a cationic charge. Such free radical induced emulsion polymerizations are exclusive of a thermoplastic polymer latex and are exclusive of the presence of an anionic surfactant. Rubber composites can be prepared by blending such nanocomposite with additional elastomer(s), additional reinforcing filler(s) and/or a coupling agent. The invention further relates to the preparation of articles of manufacture, including tires, having at least one component comprised of said nanocomposite or said rubber composite. Such a tire component may be selected from, for example, tire tread and tire innerliner.

The present invention relates to photo crystal film, and is especially one kind of colloidal photon crystal film and its preparation and application in ultraviolet preventing material or cosmetics material. The colloidal photon crystal film is prepared through coating monodispersed polymer latex in hard core-soft shell structure on flat substrate and volatilizing the dispersing liquid; the obtained monodispersed polymer latex particle has shell of 20-50 nm thickness, particle size of 100-160 nm and multiple dispersion index not greater than 0.005; and colloidal photon crystal film has photon band gap in the ultraviolet region of 200-400 nm. The colloidal photon crystal film is used as the ultraviolet preventing material in cosmetics, paint, etc.

Disclosed are an acrylate emulsion modified by one or more acryloxyalkoxysilanes with a controllable latex particle shape, and a preparation method and application thereof. The emulsion of the present invention is obtained by the emulsion copolymerization of (meth)acryloyloxyalkoxysilane and acrylic acid hydrocarbyl ester, and it is not necessary to use methacrylate monomers with high volatility and toxicity, styrene and unsaturated acids. other types of unsaturated monomers. Using the relationship of the reactivity ratio in the reaction kinetics, by controlling the entry of the reaction raw materials, copolymers with different latex particle morphological structures can be obtained through emulsion polymerization. The copolymerization method is simple in operation, low in cost and environmentally friendly. The polymer product thus obtained has significantly improved certain mechanical properties. The emulsions can be used in buffer coatings, adhesives, sealants, gaskets, inks, and cleaning agents. The sealant made with this emulsion has good stability and can be placed stably for more than one year at room temperature. It can be widely used in sealing, coating and bonding of automobiles, building materials, daily products, etc.

The invention relates to a graphene-based dielectric elastomer composite material and a preparing method thereof. The composite material comprises an elastomer matrix, graphene oxide dielectric padding and a crosslinking system, wherein the graphene oxide dielectric padding is oxidation graphene with the surface wrapped by a poly-dopamine organic layer and is scattered in the elastomer matrix in a nanometer horizontal layer mode, and an isolation network structure that an oxidized graphene slice layer which is wrapped by the poly-dopamine organic layer wraps latex particles. According to the preparing method, the dopamine bionic ornament oxidization graphene is adopted, the dielectric loss is obviously reduced, the electric breakdown strength is improved, the organic layer thickness of the poly-dopamine can be regulated through the parameters of the modification process of the dopamine, the dielectric constant, the dielectric loss and the electric breakdown strength of the composite material can be adjusted according to the demands, and the graphene-based dielectric elastomer composite material meeting the safety requirement in the biology medical field can be prepared.

The invention provides a high-water-resistance acrylate emulsion. The emulsion comprises the following raw materials in percentage by weight: 20%-25% of styrene, 15%-20% of butyl acrylate, 3%-5% of methyl methacrylate, 1%-3% of acrylic acid, 1%-2% of organic silicon monomer, 1%-2% of mixed emulsifying agent, 0.5% of sodium bicarbonate, 0.5% of initiator and the balance of water. According to the invention, in the emulsion polymerization process, a reaction type emulsifying agent is adopted to carry out a polymerization reaction, and the emulsifying agent is polymerized to a large molecule chain in the polymerization process, thereby reducing the transfer of the emulsifying agent in a paint film, reducing the water adsorption rate of the paint film and improving water resistance; through adopting a nucleus-shell polymerization process, a shell polymerization part is subjected to copolymerization modification with organic silicon, so that a hydrophobic structure is formed on the surface of a latex particle, thereby improving the water resistance after film formation finally; and through the synergistic effect of the two methods, the water resistance of the prepared emulsion is greatly improved and the prepared emulsion can be widely applied to production and preparation of paints for inner and outer walls.

The invention relates to compositions and methods of treatment employing compositions comprising polyelectrolyte complexes. The compositions include a water-soluble first polyelectrolyte bearing a net cationic charge or capable of developing a net cationic charge and a water-soluble second polyelectrolyte bearing a net anionic charge or capable of developing a net anionic charge. The total polyelectrolyte concentration of the first solution is at least 110 millimolar. The composition is free of coacervates, precipitates, latex particles, synthetic block copolymers, silicone copolymers, cross-linked poly(acrylic) and cross-linked water-soluble polyelectrolyte. The composition may be a concentrate, to be diluted prior to use to treat a surface.

The present invention is drawn to the use of blocked maleimide monomers for the preparation of latex particles, including those having active maleimide surface groups. In accordance with this, a method of forming latex particulates can comprise the steps of preparing a monomer emulsion including an aqueous phase and an organic monomer phase, wherein the organic monomer phase includes at least one blocked maleimide monomer; polymerizing the organic monomer phase to form blocked maleimide latex particulates dispersed in the aqueous phase; and unblocking the blocked maleimide latex particulates to form latex particulates with active maleimide groups at least on the surface of the latex particulates.

Latex additives, methods for treating latex additives, drilling fluid systems, and lost circulation pills comprising the latex additives, the latex additive comprising latex particles having a particle size distribution before aging comprising an average particle diameter of about 1 micron or less; and a quantity of one or more water soluble oxygenated organic molecules comprising two or more oxygen atoms effective to maintain substantially the same particle size distribution before and after freezing the latex additive.