318 results about "Methacrylic acid copolymer" patented technology

The present invention is a new stable extended release drug composition particularly suitable for use as a beta-adrenoreceptor antagonist agent. The present invention is specifically a drug composition comprising a pharmaceutical, a methacrylic acid copolymer and a matrix forming agent, and a method for manufacturing same. When applied to highly soluble drugs like metoprolol succinate, the resulting drug composition is characterized by an extended-release profile.

The aqueous paste for an electrochemical cell of the present invention comprises an aqueous dispersion for an electrochemical cell that comprises an olefin copolymer (a); an active material; and a conductive assistant, wherein the olefin copolymer (a) has a weight average molecular weight of not less than 50,000 and is at least one kind selected from a random propylene copolymer (a-1) containing 50% by weight to less than 85% by weight of a structural unit derived from propylene; an acid-modified random propylene copolymer (a-2) obtained by modifying the copolymer (a-1) with an acid; and an ethylene-(meth) acrylic acid copolymer (a-3) containing 5% by weight to less than 25% by weight of a structural unit derived from (meth) acrylic acid.

A multilayer heat-sealable chlorine-free film of relatively low modulus, high interlaminar strength, and low noise upon flexing is provided. The film includes an odor barrier layer and at least one directly adjoining heat-sealable skin layer. The barrier layer is composed of either an aliphatic or partially aromatic polyamide resin, or a blend thereof, blended with an ionomer resin consisting essentially of a partially neutralized ethylene-methacrylic acid copolymer, and the heat-sealable skin layer or layers bonded directly to the barrier layer are composed of copolymers of ethylene and an ester-containing comonomer. High resistance to delamination of the barrier layer and skin layer(s) is achieved without tie layers therebetween. Pouches formed of such multilayer chlorine-free films are also disclosed.

The present invention relates to a gastric retentive tablet composition comprising: (1) coated particles essentially consisting of a drug and an amino methacrylate copolymer, (2) a methacrylic acid copolymer and (3) an excipient, wherein items 1, 2, and 3 are blended together, and then compressed into a gastric retentive tablet. Thus, the coated particles (item 1), a methacrylic acid copolymer and the excipient are evenly distributed in the tablet. The excipient is selected from a group consisting of a retarding agent, a binder, a filler, a chelating agent, a diluent, a disintegrant, a lubricant, a colorant, a solubilizing agent, or a mixture thereof. The coated particles (item 1) do not contain methacrylic acid polymer.

An object of the present invention is to provide a golf ball having an excellent properties like flight distance and low temperature durability. The present invention provides a golf ball comprising: a core consisting of a center and one or more intermediate layers covering the center; and a cover covering the core, wherein at least one piece or one layer of said intermediate layers is formed from a highly elastic intermediate layer composition that contains (A) a highly elastic polyamide resin having a flexural modulus in a range from 700 MPa to 5,000 MPa; (B) a metal-neutralized product of ethylene-(meth)acrylic acid copolymer and (C) a resin having a polar functional group in a specific way.

A negative electrode for a lithium ion secondary battery, including: a negative electrode material mixture including an active material powder capable of reversibly absorbing and desorbing lithium, and a binder, wherein the active material includes at least one element selected from the group consisting of Si and Sn, and the binder includes at least one selected from the group consisting of an ethylene-acrylic acid copolymer and an ethylene-methacrylic acid copolymer.

A flame retardant polycarbonate resin composition that can have excellent scratch resistance and impact resistance includes: (A) about 10 to about 89 wt % of a polycarbonate resin; (B) about 10 to about 89 wt % of a polycarbonate-polysiloxane copolymer; (C) about 1 to about 70 wt % of a modified (meth)acrylic copolymer resin; and (D) about 1 to about 50 parts by weight of a phosphorus-based flame retardant, based on about 100 parts by weight of components (A)+(B)+(C).

The invention is a reactive hot melt composition which has excellent adhesion and curing properties, and can be formulated into free-flowing pellets or beads, by using an ethylene-acrylic acid copolymer, and athylene-methacrylic acid copolymer, and/or an ethylene-acrylic acid methacrylic acid terpolymer as a component of the composition along with free radical crosslinking initiators. The incorporation of a foaming agent enables the production of compositions which are useful in space-filling applications, (i.e., as so-called "anti-flutter" compositions).

The present invention relates to an adhesive useful as a tie layer between a metal foil and polyethylene film that is a blend of two ethylene acrylic or methacrylic acid copolymers, one having a high-acid and a high-melt index and the other having a lower acid content and a lower melt index.

The invention relates to a high-temperature-resistant soft double-shield instrument cable for maritime oil and gas engineering and a manufacturing method thereof. The cable is characterized in that a chemical cross-linked polyolefin insulation layer is extruded at the periphery of a tin-plated annealed stranded copper conductor to form a power cable insulation wire core; every two insulation wire cores are stranded, and then wrapped with a wire core copper foil polyester composite tape shielding layer and a wire core polyester tape, and then the insulation wire cores are stranded to form a cable core; and the periphery of the cable core is successively provided with an extruded cable core copper foil polyester tape and cable core polyester tape, an extruded inner sheath, a clad copper alloy wire weaving armor layer, a wrapped water-proof wrapping tape, and an extruded outer sheath. The insulation layer comprises the following raw material components: 12 parts of ethylene/vinyl acetate copolymer, 6 parts of high density polyethylene, 2 parts of ethylene-methacrylic acid copolymer, 0.5-1 part of cross-linking agent DCP (Dicumyl Peroxide), 0.4-0.9 part of antioxidant 1076, 0.2-0.4 part of antioxidant DNP, 0.2-1 part of lubricant stearic acid, 25-30 parts of aluminum hydroxide, 0.6-1 part of red phosphorus; and 0.05-0.1 part of ultraviolet ray absorber UV-326. The insulation layer of the cable is excellent in high-temperature resistance and ageing resistance, and long in service life.

The present invention relates to solid oral pharmaceutical compositions of duloxetine, process for preparing such compositions and method of using such compositions. Preferably, the invention relates to a delayed release composition of duloxetine comprising a core comprising duloxetine, optional separating coat and an enteric coat, wherein the enteric coat comprises methacrylic acid copolymer.

A thermoplastic resin composition according to the present invention is characterized by comprising: (A) a polycarbonate resin; and (B) a biphenyl group-containing (meth)acrylic copolymer. As such, the refractive index of the biphenyl group-containing (meth)acrylic copolymer (B) can be approximately from 1.495 to 1.640. The thermoplastic resin composition exhibits superior balance of material properties such as impact strength, internal scratch resistance, transparency, thermal resistance and appearance.

Delayed release formulations of duloxetine hydrochloride and methods for its manufacture are described. A preferred formulation includes an inert core, a drug layer comprising duloxetine hydrochloride, a separating layer and an enteric layer comprising at least one of methacrylic acid copolymer and hydroxypropyl methyl cellulose phthalate.

The present invention provides an adhesive composition, an optical member, a surface protective film, and an adhesive sheet, wherein the adhesive composition includes 100 parts by weight of a (meth)acrylic copolymer having a weight average molecular weight of about 100,000 to about 2,000,000 g/mol; about 0.01 to about 5 parts by weight of a peroxide crosslinking agent; and about 0.001 to about 5 parts by weight of a carbodiimide.

The invention discloses a preparation method for acrylonitrile/methacrylic acid copolymer foamed plastic. The preparation method comprises the following steps: adding deionized water, a suspending agent and an aqueous phase inhibitor into a reactor, and uniformly agitating; uniformly mixing monosomic acrylonitrile, methacrylic acid and an initiator, adding the mixture into the reactor, agitating the mixture at the room temperature so as to obtain a stable suspension, rising the temperature to a reaction temperature, and performing free radical suspension polymerization under the condition of agitation; drying a slurry-shaped mixture obtained after the reaction; uniformly mixing copolymer powder, a carbamide foaming agent and a bismaleimide (BMI) crosslinking agent which are obtained after drying; performing hot-pressing foaming formation of the mixture, and otaining polymethacrylimide foamed plastic via heat treatment. The technical scheme provided by the invention is high in production efficiency and yield, can obtain a product with stable performance, is simple and convenient to operate and environmental-friendly, and realizes a beneficial implement effect.

The present invention provides an antistatic agent composition which attains sufficient antistatic properties and also has antistatic properties having excellent durability against high temperature, high humidity and ultraviolet irradiation. The antistatic agent composition of the present invention comprises a water-soluble resin having a carboxyl group, a crosslinking agent having a functional group capable of reacting with a carboxyl group, and an ammonium salt having a specific chemical structure. One or more crosslinking agents selected from a carbodiimide resin, an epoxy resin, an isocyanate resin and a zirconium salt are preferably used as the crosslinking agent. At least one kind of a water-soluble resin selected from the group consisting of polyacrylic acid and an acrylic acid-methacrylic acid copolymer is preferably used as the water-soluble resin.

Disclosed herein is a methacrylic copolymer which is a polymer of a monomer mixture comprising about 20 to about 99.9% by weight of a C_6-20 aromatic methacrylate, an aliphatic methacrylate, or a combination thereof, and about 0.1 to about 80% by weight of a mono-functional unsaturated monomer. The methacrylic copolymer can have a high refractive index of about 1.495 to about 1.59, and thus when it is blended with polycarbonate resin, it is possible to obtain a methacrylic resin composition having improved compatibility without any other compatibilizer.

The invention discloses a method for preparing a polymer retanning fat-liquoring agent and the retanning fat-liquoring agent. The preparation method comprises the following steps of: preparing long-chain fatty alcohol maleic acid monoester by adopting C8-C18 long-chain fatty alcohol and maleic anhydride, preparing the long-chain fatty alcohol maleic acid monoester into long-chain fatty alcohol maleic acid monoester salt, and then dripping methacrylic acid octadecyl ester, aqueous solution of sodium methacrylate and aqueous solution of initiator into the long-chain fatty alcohol maleic acid monoester salt to perform aqueous emulsion copolymerization to form the polymer retanning fat-liquoring agent. The polymer retanning fat-liquoring agent contains terpolymer of the methacrylic acid octadecyl ester, the long-chain fatty alcohol maleic acid monoester and the methacrylic acid. The preparation method saves an organic solvent during synthesizing the retanning fat-liquoring agent so as to reduce environmental pollution, and meanwhile overcomes the defect of insufficient fat-liquoring performance of a long-chain fatty alcohol maleic acid monoester and methacrylic acid copolymer by introducing oleophilic methacrylic acid octadecyl ester monomer into the polymer.

The invention discloses a production method of ionic middle membrane laminated glass. The method comprises the steps of earlier stage glass processing, glass lamination, and glass doping, an ionic middle membrane is an ethylene and methacrylic acid copolymer, about 1% of metal sodium ions contained are bonded with the glass by ionic bonds, the bonding strength is larger compared with the strength of PVB (Polyvinyl butyral), the shearing modulus is more than 50 times that of the PVB/PU (polyurethane), the tearing strength is 5 times higher than that of the PVB/PU, and the transparency is good.

The invention discloses concrete synergist and a preparation method thereof. The concrete synergist comprises, by weight, 10-30 parts of alcamines substances, 8-18 parts of organic alcohol, 5-15 parts of methacrylic acid copolymers, 4-12 parts of alkaline inorganic salt, 0.1-2 parts of hydroxyl silicones, 0.5-4 parts of tripolyphosphate and 35-60 parts of water, and the methacrylic acid copolymers refer to one or two copolymers among methacrylic acid-hydroxyethyl acrylate copolymer co-MAA-HEA of which the molecular weight is 50000-6000 and the block proportion MAA: HEA is (3-4): 1, methacrylic acid-hydroxy-propyl acrylate copolymer co-MAA-HPA of which the molecular weight is 40000-50000 and the block proportion MAA: HPA is (4-5): 1 and methacrylic acid-ethyl acrylate co-MAA-EA of which the molecular weight is 30000-40000 and the block proportion MAA: EA is (4-6): 1. The concrete synergist is free from strong odor and toxicity, high in efficiency and environmental friendly.

To provide: a (meth)acrylic acid copolymer, which exhibits excellent chelating ability, dispersibility, and gel resistance, and can be preferably used in various applications, for example, in a dispersant such as an inorganic pigment and a metal ion, a detergent builder, and a water treatment agent such as a corrosion inhibitor and a scale inhibitor; and a method for producing the (meth)acrylic acid copolymer; and an application thereof. A (meth)acrylic acid copolymer having a constitutional unit (a) derived from a (meth)acrylic acid monomer (A) represented by a general formula (1) and a constitutional unit (b) derived from a hydroxyalkyl (meth)acrylate monomer (B) represented by a general formula (2),

• • wherein the copolymer has a sulfonic acid (sulfonate) group, and a value A of 10 or more, the value A being defined by a formula (1): A=1/(Abs−Abs0)