4357 results about "Vinyl acetate" patented technology

Generally speaking, the present invention is a water-soluble copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%. The second monomer is preferably selected from the group of monomers having carboxylate functionality or sulfonate functionality. The resulting water-soluble copolymer film is disclosed for use in making pouches to contain a unit dose of liquid detergent, such as a liquid laundry detergent. However, it is an aspect of the copolymer film that film solubility is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.

The invention provides a controlled release bioactive agent delivery device that includes a body member having a direction of extension, a longitudinal axis along the direction of extension, and a proximal end and a distal end, wherein at least a portion of the body member deviates from the direction of extension, and a polymeric coated composition in contact with the body member, the polymeric coated composition including a first polymer, a second polymer, and a bioactive agent, wherein the first polymer comprises polyalkyl(meth)acrylate, aromatic poly(meth)acrylate, or a combination of polyalkyl(meth)acrylate and aromatic poly(meth)acrylate, and wherein the second polymer comprises poly(ethylene-co-vinyl acetate). The invention also provides methods of delivering a bioactive agent to a patient in a controlled release manner, as well as methods of making a controlled release bioactive agent delivery device.

A coating composition for use in coating implantable medical devices to improve their ability to release bioactive agents in vivo. The coating composition is particularly adapted for use with devices that undergo significant flexion and/or expansion in the course of their delivery and/or use, such as stents and catheters. The composition includes the bioactive agent in combination with a mixture of a first polymer component such as poly(butyl methacrylate) and a second polymer component such as poly(ethylene-co-vinyl acetate).

The invention relates to a composite comprising a weight fraction of single-wall carbon nanotubes and at least one polar polymer wherein the composite has an electrical and/or thermal conductivity enhanced over that of the polymer alone. The invention also comprises a method for making this polymer composition. The present application provides composite compositions that, over a wide range of single-wall carbon nanotube loading, have electrical conductivities exceeding those known in the art by more than one order of magnitude. The electrical conductivity enhancement depends on the weight fraction (F) of the single-wall carbon nanotubes in the composite. The electrical conductivity of the composite of this invention is at least 5 Siemens per centimeter (S/cm) at (F) of 0.5 (i.e. where single-wall carbon nanotube loading weight represents half of the total composite weight), at least 1 S/cm at a F of 0.1, at least 1×10^{−4 S/cm at (F) of 0.004, at least 6×10−9} S/cm at (F) of 0.001 and at least 3×10⁻¹⁶ S/cm (F) plus the intrinsic conductivity of the polymer matrix material at of 0.0001. The thermal conductivity enhancement is in excess of 1 Watt/m-° K. The polar polymer can be polycarbonate, poly(acrylic acid), poly(acrylic acid), poly(methacrylic acid), polyoxide, polysulfide, polysulfone, polyamides, polyester, polyurethane, polyimide, poly(vinyl acetate), poly(vinyl alcohol), poly(vinyl chloride), poly(vinyl pyridine), poly(vinyl pyrrolidone), copolymers thereof and combinations thereof. The composite can further comprise a nonpolar polymer, such as, a polyolefin polymer, polyethylene, polypropylene, polybutene, polyisobutene, polyisoprene, polystyrene, copolymers thereof and combinations thereof.

Disclosed is a catalyst. The catalyst comprises palladium, gold, and a support comprising titanium dioxide and tungsten trioxide. The support preferably comprises from 75 wt % to 99 wt % of titanium dioxide and from 1 wt % to 25 wt % of tungsten trioxide. A method for preparing the catalyst is also disclosed. The method comprises impregnating the support with a palladium compound and a gold compound, calcining the impregnated support, and then reducing the calcined support. Further disclosed is a method for preparing vinyl acetate with the catalyst. The catalyst exhibits improved catalytic activity and selectivity.

A catalyst for synthesizing vinyl acetate from acetylene and acetic acid is prepared from activated carbon, zinc acetate and alkaline bismuth carbonate in mass ratio of 100: (27-40): 0.026 by excessive solution dipping method.

The invention relates to a transdermal analyte monitoring system comprising a medium adapted to interface with a biological membrane and to receive an analyte from the biological membrane and an electrode assembly comprising a plurality of electrodes, wherein the medium is adapted to react continuously with the analyte, an electrical signal is detected by the electrode assembly, and the electrical signal correlates to an analyte value. The analyte value may be the flux of the analyte through the biological membrane or the concentration of the analyte in a body fluid of a subject. The medium may comprise a vinyl acetate based hydrogel, an agarose based hydrogel, or a polyethylene glycol diacrylate (PEG-DA) based hydrogel, for example. The surface region of the electrode may comprise pure platinum. The system may include an interference filter located between the biological membrane and the electrode assembly for reducing interference in the system. The system may comprise a processor programmed to implement an error correction method that corrects for sensor drift.

This invention provides an electrically conductive ink comprising an electrically conductive material and a vinyl chloride/vinyl acetate/hydroxyalkyl (meth)acrylate copolymer resin. There is also provided a noncontact-type medium comprising a base material and, provided on the base material, an electrically conductive circuit formed using the electrically conductive ink, and an IC chip mounted in the state of being electrically conducted to the electrically conductive circuit. An electrically conductive circuit, which is in a thin film form, can be used as an antenna circuit for noncontact-type media, has a low volume resistivity on the order of 10⁻⁵ Ω·cm, and is highly reliable under a high temperature and high humidity environment, can be formed by using the electrically conductive ink at a low temperature in a short time.

The present invention is directed to nanoparticulate compositions comprising a poorly soluble drug and at least one copolymer of vinyl pyrrolidone and vinyl acetate as a surface stabilizer adsorbed to the surface of the drug. Also encompassed by the invention are pharmaceutical compositions comprising a nanoparticulate composition of the invention, methods of making and using such nanoparticulate and pharmaceutical compositions.

The invention discloses a radiation pre-crosslinked ethylene-vinyl acetate (EVA) resin film which comprises the following components in parts by weight: 51-99.58 parts of EVA resin, 0.3-2 parts of organic peroxide crosslinking agent, 0.01-5 parts of assistant crosslinking agent, 0.1-2 parts of antioxidant, 0.01-2 parts of silane coupling agent, 0-40 parts of pigment and 0-40 parts of polyolefin elastomer. The invention also discloses a preparation method of the radiation pre-crosslinked EVA resin film, which comprises the steps of sufficiently mixing 51-99.58 parts of EVA resin, 0.3-2 parts of organic peroxide crosslinking agent, 0.01-5 parts of assistant crosslinking agent, 0.1-2 parts of antioxidant, 0.01-2 parts of silane coupling agent, 0-40 parts of pigment and 0-40 parts of polyolefin elastomer, and adding into an extruder; extruding and forming a film through a T-shaped flat mould; rolling and radiating to obtain the radiation pre-crosslinked EVA resin film. Since the film is partially crosslinked before use, the dimensional stability and heat resistance of the film are remarkably improved, thus the film is suitable for large-scale popularization and application.

A coating composition in the form of a one or multi-part system, and method of applying such a composition under conditions of controlled humidity, for use in coating device surfaces to control and/or improve their ability to release bioactive agents in aqueous systems. The coating composition is particularly adapted for use with medical devices that undergo significant flexion and/or expansion in the course of their delivery and/or use, such as stents and catheters. The composition includes the bioactive agent in combination with a first polymer component such as polyalkyl(meth)acrylate, polyaryl(meth)acrylate, polyaralkyl(meth)acrylate, or polyaryloxyalkyl(meth)acrylate and a second polymer component such as poly(ethylene-co-vinyl acetate).

The present invention relates to a thermoplastic/natural cellulosic fiber composite, and more specifically to a high molecular weight compatibilizer within that composite resulting in both a high flex strength and high modulus and significant reduction in water absorption. The compatibilizer is preferably a terpolymer comprising: a) 0.5-20 percent by weight of monomer units selected from the group consisting of maleic anhydride, substituted maleic anhydride, mono-ester of maleic anhydride, itaconic anhydride, maleic acid, fumaric acid, crotonic acid, acrylic acid and methacrylic acid; b) 0 to 40 percent by weight of monomer units selected from styrene and functionalized styrene; and c) 40 to 98.5 percent by weight of monomer units selected from the group consisting of C_1-8 alkyl acrylates and methacrylates, and vinyl acetate.

The invention provides a bittern-free flame-proof thermal contraction sleeve which comprises (by weight ratio), (1) 100 parts of one or more selected from ethane-vinyl acetate copolymer (EVA), ethene-ethyl acrylate copolymer (EEA), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), (2) 5-50 parts of one or more selected from ethylene-propylene terpolymerisate rubber (EPDM), ethylene propylene rubber (EPM), dimethyl silicone rubber (MQ), methylvinyl silicone rubber (VMQ), methylsilicone rubber with phenyl and vinyl Group (PVMQ), thermoplastic elastomer styrene - butadiene - styrene blocked copolymer (SBS), styrene-isoprene blocked copolymer (SIS), (3) 50-100 parts of bittern-free flame retardant, and (4) 0.5-6 parts of coupling agent.

The present invention relates to a novel hydrocolloid adhesive mass useful for medical purposes, characterized in that said hydrocolloid adhesive mass comprises:a) 0.2 to 5 parts by weight of an ethoxylated sorbitan fatty acid ester;b) 20 to 50 parts by weight of a hydrocolloid;c) 32 to 120 to parts by weight of an adhesive matrix made up of one or more polymers selected from poly(styrene/olefin/styrene) block copolymers, low-molecular polyisobutylenes and high-molecular polyisobutylenes, and one or more compounds selected from sticky resins, or tackifying resins, plasticizers, polybutenes, antioxidants, ethylene/vinyl acetate copolymers, butyl rubbers and ethylene/propylene block copolymers; andd) 0 to 15 parts by weight of an acrylate copolymer with a glass transition temperature below -20° C. It further relates to the use of this hydrocolloid adhesive mass for the production of dressings, especially for the treatment of superficial, deep, chronic or acute dermo-epidermal lesions, exudative wounds and bums.

A resin composition is provided which comprises (A) a saponified ethylene-vinyl acetate copolymer (referred to as EVOH for short) with an ethylene content of 20 to 60 mole percent and a saponification degree of not less than 90 mole percent, and contains therein (B) a boron compound as an essential component, (C) acetic acid as an optional component, and at least one compound selected from among (D) an acetic acid salt and (E) a phosphoric acid compound as an essential component, the contents of the respective additive components per 100 parts by weight of EVOH (A) being as follows:boron compound (B): 0.001 to 1 part by weight on the boron basis;acetic acid (C): 0 to 0.05 part by weight;acetic acid salt (D): 0.001 to 0.05 part by weight on the metal basis; andphosphoric acid compound (E): 0.0005 to 0.05 part by weight on the phosphate radical basis.This resin composition is typically produced by bringing EVOH (A) with a water content of 20 to 80% by weight into contact with an aqueous solution containing the respective additive components mentioned above and then subjecting the thus-treated EVOH to fluidized state drying and then to stationary state drying.

The invention relates to an aging-resistant EVA film adhesive for solar cell package and method for preparation, wherein the preparation constituents include ethane-vinyl acetate copolymer (EVA), cross-linking and curing agent, ultraviolet light absorbent, anti-oxidant, and hindered amine light-stability agent. The preparation comprises the steps of mixing homogeneously, blending extrusion, flow casting the extrudate, cooling down, drawing, and winding.

The invention relates to a cold-resistant PVC cable material which can resist the cold of minus 50DEG C, and a preparation method thereof; the material comprises PVC cable material; and after being added with the multipolymer of vinyl chloride and vinyl acetate, the cold resistant temperature of the cable material reaches minus 50DEG C. The invention has the advantages that: 1. the low-temperature impact brittleness temperature of the prepared low temperature resistant cable material can reaches minus 50DEG C; and 2. not only the process performance of PVC is not changed but also the manufacturing cost is low.

The invention discloses a radiation cross-linked low-smoke halogen-free red phosphorus-free flame retardant material, which comprises the following components of: by weight, 10-80 parts of ethene-vinyl acetate copolymer, 5-30 parts of ethylene-octene copolymer and/or ethene-butene copolymer and/or terpolymer EP rubber, 0-100 parts of polyethylene, 1-20 parts of a polymer compatilizer, 0.5-10 parts of organosilicon polymer, 1-10 parts of a composite anti-oxidant, 0-200 parts of aluminium hydroxide and/or magnesium hydroxide and/or modified aluminium hydroxide and/or modified magnesium hydroxide, 0.1-100 parts of high molecular weight ammonium polyphosphate and/or 0.1-50 parts of a phosphate ester fire retardant and/or 0.1-50 parts of MCA. The material provided by the invention reaches American UL224VW-1 standard when applied in thermal shrinkable tubes, reaches American UL1581VW-1 standard when applied in electric wires and cables, contains no halogen or red phosphorus, and is environmentally friendly.

A gel polymer electrolyte according to the present invention comprises a polymer selected from the group consisting of vinyl acetate copolymer, poly(ethylene/vinylacetate/carbon oxide: EVACM), and poly(ethylene/vinylacetate/maleic acid anhydride: EVAMA); an inorganic filler; and a liquid electrolyte that a lithium salt is dissolved in an aprotic solvent. It is preferable that the polymer material in a gel polymer electrolyte according to the present invention is in the range of 20 to 30% by weight, the inorganic material filler is in the range of 5 to 20% by weight, and the liquid electrolyte is in the range of 60 to 80 % by weight. As a specific functional group which has a high compatibility with a liquid electrolyte in the present invention is contained in the polymer material, a lithium ion becomes to move with ease in electrolyte, and the ionic conductivity is over 0.5 mS/cm which is the demand level of a gel polymer electrolyte. Also, it provides the gel polymer electrolyte material with a high film formability, a good property of containing an electrolyte, a good adhesion, and a good mechanical strength.

The present invention relates to high solid content vinyl acetate-ethylene copolymer latex for binder and the synthetic method, including 55 to 75 portion of vinyl acetate, 24 to 45 portion of ethylene, 3 to 5 portion of N-methylol acrylamide, 2 to 4 portion of PVA1788 and PVA0588, 0.4 to 1.0 portion of the compound of nonionic emulsifying agent nonyl phenol polyoxyethylene alkyl ether and anion emulsifying agent alkyl sulphate with 2:1 mixture ratio, 0.2 to 1.0 portion of 35 percents oxydol with 1:1 mixture ratio, 0.05 to 0.4 portion of formol zinc sulphate, 0.1 to 0.5 portion of ferrous sulphate, 0.5 to 1.0 portion of regular dodeca-carbon thiol-alcohol, 0.05 to 0.35 portion of potassium phosphate, 0.1 to 0.5 portion of sodium bicarbonate and 45 to 55 portion of de-ionized water. With the adoption of latex polymerization, low-residual monomer VAE latex with solid content more than 65 percents is synthesized, which is used as binder to be applied in timber processing industry and packaging industry.

The invention discloses a mildewproof preservative film and a preparation method thereof. The mildewproof preservative film comprises a base layer and a mildewproof preservative coating arranged on the base layer, wherein the mildewproof preservative coating is prepared from a mildewproof preservative paint. The mildewproof preservative paint comprises the following components in percentage by weight: 20-60% of resin, 30-70% of solvent, 0.5-10% of mildew preventive and 0.3-5% of aid. The resin is composed of at least one of polyurethane, an acrylate copolymer, polyvinyl alcohol, polyvinylidene chloride, modified polyvinylidene chloride, an ethylene-vinyl acetate copolymer, a polyvinyl acetate copolymer and a vinyl acetate-butyl ester copolymer; and the solvent is composed of at least one of water and ethanol. The mildewproof preservative coating of the mildewproof preservative film has the advantages of compact surface and no void; and by adding the mildew preventive, the mildewproof preservative coating has the favorable effects of keeping the moisture constant and preventing mildewing. The mildewproof preservative film is especially suitable for preserving fruits, bread, tobacco and other foods which have shorter storage period, can easily mildew in a short time and need to be eaten in time.

The disclosed radiation crosslinking low-fume non-halogen/phosphate nano flame-retardant heat-shrinkable material contains the ethene/vinyl-acetate copolymer, ethene/octene copolymer, polymer solvent, organosilicon polymer, composite antioxidant, nano Mg(OH)2 flame retardant, ultrafine Al(OH)3 Mg(OH)2 with activating-treated surface, lubricant, and lubricant; and can be manufactured by sitrring, extruding, drawing, air cooling, cutting grain, radiating, stretching and cooling form. The product has super flame-retardant effect and affects little to environment or human after abandonment. The preparation method is low cost and fit to industrial production.

A laundry detergent composition comprising a graft copolymer of polyethylene, polypropylene or polybutylene oxide with vinyl acetate in a weight ratio of from about 1:0.2 to about 1:10; from about 0.2% to about 8% of organic solvent; and from about 2% to about 20% of a surfactant system; wherein said detergent composition is in a form selected from: liquid; gel; and combinations thereof.

The present invention is directed to an oxygen scavenger composition comprising a mixture of (i) a polyester polymer composed of polymer segments containing cycloalkenyl group or functionality; and (ii) an ester type polymer selected from (a)a polyester having a high content of alkylene groups; (b) a polylactone; and (c) a polyvinylacetate having at least about 50 weight percent vinyl acetate mer units therein. The present polymer composition has been found to act as an oxygen scavenger agent under both ambient and refrigerated conditions, to be compatible with conventional film forming packaging materials, to provide compositions exhibiting low tack, and to be capable of being readily processed using conventional film forming equipment.

A low-smoke and non-halogen poly-olefine material with radiant graft maleic anhydride vinyl-vinyl acetate multi-polymer as compatilizer is prepared by dissolving maleic anhydride 1-5 proportion into acetone, mixing with vinyl-vinyl acetate multi-polymer 100 proportion, volatilizing for acetone, granulating in double-screw extruder, and electronic-ray or gamma-ray radiating by electronic accelerator with 5-30KGy. The compatilizer graft rate is greater than or equal to 1%, it has better poly-olefine material performance, more white fire retardant and no need for anti-smoke agent. It can be used to make poly-olefine thermal shrinkage pipe with VW-1 vertical burning performance according to UL224 standard.

The invention discloses a high temperature resistant flexible low-smoke zero-halogen flame-retardant polyolefin compound. The material formula thereof consists of the following materials: an ethylene-vinyl acetate copolymer, a propylene-ethylene copolymer, an interfacial compatilizer, a flame retardant, an antioxidant silane coupling agent and a lubricant, wherein, the Shore A hardness of the ethylene-vinyl acetate copolymer is less than 75, the weight content of the vinyl acetate in the raw material monomer is 30 percent to 70 percent, the Shore A hardness of the propylene-ethylene copolymer is less than 90, and the Shore A hardness of the interfacial compatilizer is less than 80. The invention can meet the high temperature resistant conditions of an aging test (135 DEG C 168h), and has the advantage of low cost.

A process for preparing self-adhesive polyethene-base protecting film includes such steps as extruding out basic film, middle layer and self-adhesive layer, and blowing film to obtain a composite film. Said basic film is prepared from low-density polyethene and low-density linear polyethene. Said middle layer is prepared from the polyethene of basic film and ethene-vinyl acetate. Said self-adhesive layer is prepared from 6 chemicals including ethene-vinyl acetate, polyethene of basic film, dioctyl adiptate, etc.

A polymer extender composition comprising monomers copolymerized in the following percentages by weight: (a) from about 5% to about 90% of a monomer of the formula I:

R₁—OC(O)—C(R)═CH₂  (I)

(b) from about 5% to about 85% of vinylidene chloride, vinyl chloride, vinyl acetate, or a mixture thereof, (c) from about 0.5% to about 3% of a monomer of the formula II:

HO—CH₂—NH—C(O)—C(R)═CH₂  (II)

(d) from about 0.5% to about 3% of a monomer of the formula III

HO—CH₂CH₂—OC(O)—C(R)═CH₂  (III)  and (e) from about 1% to about 5% of a monomer of the formula IV:

H—(OCH₂CH₂)_m—O—C(O)—C(R)═CH₂  (IV)

(f) from 0% to about 25% of methyl methacrylate, vinylbenzyl chloride, styrene or a mixture thereof, wherein

• • each R is independently H or CH₃;
  • R₁ is a linear or branched or cyclic alkyl chain having from about 4 to about 18 carbon atoms, and m is 2 to about 10.

The object of the present invention is to provide an intermediate film for a laminated glass having excellent transparency, adhesion, impact resistance and penetration resistance as well as excellent light resistance and weather resistance, and scarcely turning yellow in a heating treatment during its preparation. An intermediate film for a laminated glass comprising a laminate consisting of a layer (PVB layer) of a composition comprising polyvinyl butyral and a layer (EVA layer) of a composition comprising ethylene/vinyl acetate copolymer containing an organic peroxide, wherein the composition comprising polyvinyl butyral contains a benzophenone compound as an ultraviolet absorber; a laminated glass; and a process for the preparation of the same.

The invention relates to a radar aluminum plating transfer coating suitable for a seamless molding process and a preparation method thereof. The coating comprises the following components in percentage by weight: 0 to 4 percent of amino resin, 0 to 15 percent of cellulose ester resin, 3 to 28 percent of polyacrylate resin, 0 to 10 percent of nitro-cotton resin, 0 to 6 percent of vinyl acetate chlorate resin, 0 to 2.8 percent of additive, and 70 to 85 percent of solvent. The preparation method comprises the following steps of: adding the solvent and the resin components into a reaction kettle; stirring the mixture and then adding the additive into the mixture; and after adjusting the solid content and the viscosity, continuously stirring, cooling and filtering the mixture to obtain a product. Compared with the prior art, the radar aluminum plating transfer coating has the advantages of high production efficiency, low energy consumption, good process adaptability, good molding effect, easy elimination of seams, easy control of production, high smoothness degree, temperature resistance, good flexibility and the like.