133 results about "Stabilizer for polymers" patented technology

A metal nanoparticle colloid solution, metal-polymer nanocomposites, and methods for preparing the same are provided. The metal nanoparticle colloid solution and the metal-polymer nanocomposites can be prepared with a variety of polymeric stabilizers and have uniform particle diameter and shape. The metal nanoparticle colloid solution and the metal-polymer nanocomposites have wide applications, for example, as an antibacterial agent, a sterilizer, a conductive adhesiv, conductive ink or an electromagnetic wave shielder for an image display.

An aqueous dispersion including (A) at least one base polymer selected from the group consisting of an ethylene-based co-polymer and a propylene-based co-polymer; (B) at least one polymeric stabilizing agent; and at least one filler; wherein the polymeric stabilizing agent is different from the at least one base polymer and is compatible with the at least one base polymer and the at least one filler, and wherein the dispersion has filler in the range of greater than 0 to about 600 parts per hundred parts of a combined amount of the at least one base polymer and the polymeric stabilizing agent is disclosed.

The invention relates to a cationic acrylamide copolymer aqueous emulsion-water and the method for preparing the same. The compound comprises 5-25 wt% of cationic polymer, 1.0-15 wt% of polymer stabilizer and 15-32 wt% inorganic salt. Said active cationic polymer comprises 72.8-90 mol% of at least one water-soluble monomer (A), 10-26 mol% of at least one cationic monomer (B), and 0.2-1.0 mol% of at least one hydrophobic monomer (C), and said polymer is prepared through free radical polymerization with pH being 3-8. The monomer (A) (B) possesses general formula respectively, monomer (c) is C1-C8 dialkyl ester of itaconic acid or C1-C32 alkyl ester of acroleic acid or C1-C32 alkyl ester or diene monomer of methacrylic acid. The method is multi-stage, and it can reduce polymerization system viscosity, increase active material content and stability of aqueous emulsion-in-water, which is characterized by high concentration, low cost, good fluidity and easiness for treatment.

The present disclosure includes a waterborne polyolefin based coating layer that has improved features as compared to epoxy coatings. The coating composition of the present disclosure include 40 to 80 weight percent (wt. %) of a base polymer; 10 to 30 wt. % of a polymeric stabilizing agent; 5 to 15 wt. % of a polymeric coupling agent; 0 to 35 wt. % of a polymeric performance improving agent; a neutralizing agent that partially or fully neutralize the polymeric stabilizing agent; and a fluid medium, where the wt. % values are based on the total weight of the base polymer, the polymeric coupling agent, the polymeric stabilizing agent and, when present, the polymeric performance improving agent (as used herein, this total weight of the base polymer, the polymeric coupling agent, the polymeric stabilizing agent and, when present, the polymeric performance improving agent may be referred to as the “solid content” of the coating composition).

The invention belongs to the technical field of oil production engineering, and provides a preparation method of a low molecular weight polymer clay stabilizer. The clay stabilizer is prepared from raw materials of carbon-containing ammonium salt and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) in the presence of an initiator in an aqueous solution through polymerization. The number average molecular weight of the polymer is less than 50000. The sulfonic acid group is introduced into the polymer stabilizer, so as to increase the water solubility and high temperature performance of the polymer. The stabilizer can form multiple point adsorption with a plurality of clay particles in the water; after adsorption, a layer of protective film is formed on the surface of clay particles to prevent expansion and migration of clay particles; and the stabilizer has the high temperature resistance performance reaching more than 120 DEG C.

The invention discloses a low-addition-amount environment-friendly alkali-free chlorine liquid accelerator. The low-addition-amount environment-friendly alkali-free chlorine liquid accelerator is prepared from, by mass, 45-55% of aluminum sulphate, 5-10% of magnesium sulfate, 5-10% of alcohol amine, 1-5% of organic acid, 1-5% of high-molecular polymer, 0-3% of a stabilizing agent and the balance water. The aluminum sulphate is at the industrial level, and the mass fraction percent of alumina is larger than or equal to 16.00. The magnesium sulfate is at the industrial level, and the alcohol amine is diethanolamine or triethanolamine. The organic acid is oxalic acid, formic acid or benzoic acid. The high-molecular polymer is polyacrylic acid or polyacrylamide. The stabilizing agent contains citric acid. The organic acid is used as a coagulation accelerating component and a pH adjusting agent, and on the basis that no alkali exists, the accelerator is stable and free of strength loss within 28 days, and concrete resilience is small, the addition amount is remarkably reduced; polyacrylic acid is used, not only is later-stage strength not affected, but also the stability of a solution is improved, and the stable time of the accelerator is longer than half a year.

The asphalt composition consists of petroleum asphalt 70-86 wt%, polymer 8-15 wt%, stabilizer 0.08-0.6 wt%, compatibilizing agent 6-10 wt% and stuffing 0-10 wt%. Its preparation process includes the following steps: heating petroleum asphalt to 175-185 deg.c and to reach flowing state, adding compatibilizing agent, polymer and stuffing successively through stirring, grinding in a colloid mill in the rotation speed of 2000-4000 rpm, swelling through stirring for 2-10, adding stabilizer and reacting for 1-5 hr to obtain the product. The asphalt composition has high stability at high temperature, high flexibility at low temperature and high elasticity restoring capacity, and is used in the antiscour layer of semi-rigid cement concrete road and the antifatigue layer of bridge.

A non-aqueous dispersion comprising a continuous phase and a dispersed phase, wherein the dispersed phase comprises the dispersion polymerization reaction product prepared from a reaction mixture comprising an ethylenically unsaturated monomer, an acrylic polymer stabilizer, and an aliphatic polyester stabilized seed polymer, is disclosed. Related coatings and coated substrates are also disclosed.

A solid dispersion transdermal drug delivery system comprising a therapeutic agent in a stable amorphous form and a combination polymeric stabilizing and dispersing agent having a hydrogen bond-forming functional group, and a method of manufacturing these systems is provided. The weight ratio of the combination polymeric stabilizing and dispersing agent to the therapeutic agent is also disclosed.

The invention relates to a shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer, belonging to the technical field of oilfield drag reducers. The drag reducer is prepared by initiating polymerization of a component A, a component B and a component C by a free-radical initiator in water, wherein the component A is composed of a plurality of nonionic water-soluble monomers with carbon-carbon double bond; the component B is a water-soluble polymer stabilizer of univalent cationic monomers; and the component C is a univalent cationic inorganic salt. The drag reducer is simple to use, quick to hydrate and convenient to add, is green and environment-friendly, and has the advantages of high dissolution rate, no bubbling, salt resistance, calcium resistance, pollution resistance, high temperature resistance, favorable compatibility, no need of adding defoaming agent and the like; and the drag reduction efficiency can reach 70% when the drag reducer is used in fracturing. The drag reducer solves the problems of high tendency to granulation and low tendency to hydration in the use process of the existing drag reducer using dry powder, and the problem that the poor compatibility among various different ions and chemical assistants in the fracturing fluid can directly influence the feasibility and effectiveness of the slickwater fracturing.

The present invention provides glass polishing compositions and methods suitable for polishing a glass substrate at a down force of about 110 g/cm² or less. One preferred polishing composition comprises a particulate cerium oxide abrasive (e.g., about 1 to about 15 percent by weight) suspended in an aqueous carrier containing a polymeric stabilizer, e.g., about 50 to about 1500 ppm of the stabilizer, and optionally, a water soluble inorganic salt. Preferably, the particulate cerium oxide abrasive has a mean particle size in the range of about 0.35 to about 0.9 μm. Another preferred composition comprises about 1 to about 15 percent by weight of a particulate cerium oxide abrasive characterized by a mean particle size of at least about 0.2 μm and a purity of at least about 99.9% CeO², on a weight basis, suspended in an aqueous carrier at a pH at least about 1 unit higher or lower than the isoelectric point (IEP) of the cerium oxide abrasive.

The invention comprises a polymeric amphiphilic stabilizing agent and its use in the inverse-emulsion and inverse-suspenion polymerization of acrylic monomers. The stabilizing agent produces inverse-emulsions and inverse-suspensions having good stability, polymers with high molecular weights, high solid content, low coagulum and which can be branched providing a means to prepare branched, or structured, dry polymers. The stabilizing agent is amphiphilic copolymer that is prepared from a mixture of linear alkylmethacrylates monomers and acrylic or methacrylic acid co-monomers. Typically, the mixture of alkylmethacrylates is comprised of esters having alkyl moieties that are from 14 to 20 carbon atoms in length. The stabilizing agent copolymers typically have number average molecular weights from about 500 to 50,000 g/mol, or weight average molecular weights from 50,000 to 100,000 g/mol.

The present invention provides an aqueous suspoemulsion comprising (a) an oil phase comprising (i) at least one triazole active compound as emulsified component, solid at room temperature, (ii) at least one alkyl carboxylic acid amide as a solvent and a crystal growth inhibitor, and (iii) a polymeric stabilizer, and (b) a continuous water phase comprising (i) at least one strobilurin active compound as suspended solid component, solid at room temperature, (ii) at least one dispersant selected from the group consisting of methacrylic acid-methyl methacrylate-polyethyleneglycol graft copolymer, tristyrylphenolethoxylates and/or propylene oxide/ethylene oxide block copolymer with 10% to 50% EO, preferably with 20% to 50% EO and most preferably with 30% to 40% EO, (iii) water, and (iiii) additives, if appropriate. a process for preparing the suspoemulsion and its use for applying the active compounds comprised therein to plants and/or their habitat are also provided.

The present invention relates to a process for preparing a polymer dispersion comprising polymerising one or more water soluble anionic monomers (m₁) and one or more non-ionic vinyl monomers (m₂) present in a reaction mixture further comprising a polymeric stabiliser (B) and a polymeric co-stabiliser (C). It further relates to a polymer dispersion, the use of the polymer dispersion and a process for producing paper.

A working fluid for a heat pipe includes a liquid solvent; a plurality of nano-particles dispersed in the liquid solvent; and a polymer stability agent configured for preventing the nano-particles from aggregating in the liquid solvent. A method for manufacturing the working fluid includes the steps of: providing a vessel containing a liquid solvent containing a polymer stability agent dispersed therein, the polymer stability agent being configured for preventing the created nano-particles from aggregating in the liquid solvent; arranging a target in the liquid solvent; and bombarding the target to create nano-particles, whereupon the nano-particles are dispersed into the polar solvent, thereby obtaining the working fluid.

The present invention is directed to stable liquid growth hormone formulations that remain stable after physical agitation, and after exposure to one or more freeze-thaw events. Formulations of the present invention can be stored long term at a variety of temperatures, even frozen. In the present invention, a combination of buffer and stabilizing agents, including a non-ionic surfactant (e.g., polysorbate 20), a polymer stabilizer (e.g., polyethylene glycol), and other optional stabilizers combine to provide unexpected stability to aqueous formulations of a growth hormone (e.g., human growth hormone).

The invention discloses a high-temperature-resistant salt-resistant polymer as well as a preparation method and application thereof, and belongs to the field of preparation of high-molecular polymers. An aqueous solution free radical polymerization and photo-initiation system is adopted, copolymerization with acrylamide, sodium acrylate and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt is carried out in an aqueous solution, and meanwhile, a polymer stabilizer, a polymer branching agent and a nanocellulose cosolvent are added; and after polymerization, granulating and drying are performed to obtain a high-temperature-resistant and high-salt-resistant anionic polyacrylamide filtrate reducer. The high-temperature-resistant and high-salt-resistant polymer filtrate reducer prepared by the invention has the characteristics of efficient tackifying property, better temperature resistance and salt resistance, and good water solubility and stability including shear stability, chemical stability, thermal stability, salt stability, biological stability and long-acting stability.