284 results about "Methacrylonitrile" patented technology

The invention provides a fluid-bed catalyst, which can withstand high voltage and high load, contains non corrosive halide, and has a high single-pass yield. The catalyst comprises metal oxide containing multi active component of Mo, Bi, Fe, Ni and Sm, and a carrier of SiO2, Al2O3 or the mixture. It can be used to prepare the high selective acrylic with propone. Comparing with the prior technique, in the condition of keeping the single- pass yield of acrylic, with the invented catalyst, production capacity of fluid-bed reactor can be improved by 20- 30%, and the usage of the catalyst can decreases by 35%.

Process for producing acrylonitrile or methacrylonitrile from propane or isobutane by ammoxidation at a temperature in the range of from 380 to 500 DEG C. in a fluidized-bed reactor containing a catalyst composition preheated to a temperature of not lower than 300 DEG C. and lower than the ammoxidation reaction temperature, the catalyst composition comprising a carrier having supported thereon an oxide catalyst comprising a compound oxide of molybdenum, vanadium, niobium and at least one element selected from tellurium and antimony, wherein the ammoxidation of propane or isobutane is preceded by a specific temperature elevation operation in which the catalyst temperature in the reactor is elevated, while supplying into the fluidized-bed reactor a molecular oxygen-containing gas together with a combustible gas capable of combustion by reaction with the molecular oxygen in the presence of said catalyst composition, until the temperature of the catalyst composition reaches said ammoxidation reaction temperature. The process of the present invention is advantageous in that the temperature elevation of the catalyst can be performed without suffering a deterioration of the catalytic activity during the temperature elevation, thereby allowing the catalyst to fully exhibit its performance.

This invention relates to novel acetylcysteine compositions in solution, comprising acetylcysteine and which are substantially free of metal chelating agents, such as EDTA. Further, this invention relates to methods of making and using the acetylcysteine compositions. The present compositions and methods are designed to improve patient tolerance and compliance, while at the same time maintaining the stability of the pharmaceutical formulation. The compositions and methods of this invention are useful in the treatment of acetaminophen overdose, acute liver failure, various cancers, methacrylonitrile poisoning, reperfusion injury during cardio bypass surgery, and radiocontrast-induced nephropathy, and can also be used as a mucolytic agent.

The invention provides polymethacrylimide foam/inorganic nano-composite material and a preparation method thereof. The composite material takes polymethacrylimide as a base body and inorganic nano-material as reinforcing material. The preparation method is as follows: high-speed stirring and power ultrasound are used to evenly disperse the inorganic nano-material into a system of methacrylic acid, methacrylamide and methacrylonitrile monomers containing auxiliary agents such as evocating agent, vesicant, polymerization inhibitor, cross linker, surfactant, parting agent and so on, the evocating agent evocates copolymerization under certain conditions to form methacrylic acid-methacrylamide-methacrylonitrile copolymer/inorganic nano-composite material with light crosslinking, and the composite material undergoes temperature rising with certain procedures, is foamed at a high temperature and produces an imide ring reaction to produce the polymethacrylimide foam/inorganic nano-composite material. The inorganic nano-material is added, so the mechanical property and the heat resistance of the composite material are apparently improved.

The invention relates to a low-temperature heat-sealing high-barrier food packaging film coating latex. The composition points of the mixed monomer of the latex is that vinylidene chloride accounts for 80 to 93 percent of the total amount of the mixed monomer; methyl acrylate, methyl ethyl oxalate, methyl methacrylate, butyl ester, acrylonitrile or methacrylonitrile account for 2 to 10 percent of the total amount of the mixed monomer; itaconic acid, acrylic acid, methacrylic acid account for 0.5 to 5 percent of the total amount of the mixed monomer; the surfactants added are 0.7 portion of SAS and 0.3 portion of sodium dodecyl sulfate; the additive 3 is 0.01 portion of metallic salt. The preparation method includes the following steps: deionized water, surfactant and additive are added in a reactor; the reactor is vacuumized and the gas is replaced by nitrogen gas; the mixed monomer is added. The product of the invention has the advantages of low temperature heat sealing and high barrier performance, and the food using the product has longer shelf life.

Composition containing, based in each case on its total weight,

• • A) 50.0% by weight to 99.5% by weight of at least one (meth)acrylate (co)polymer and
  • B) 0.5% by weight to 50.0% by weight of at least one copolymer obtainable by polymerisation of a monomer mixture comprising
    • i. 70% by weight to 92% by weight of a vinylaromatic monomer and
    • ii. 8% by weight to 30% by weight of acrylonitrile or methacrylonitrile or mixtures thereof and
    • iii. 0% by weight to 22% by weight of at least one further monomer, the composition having a haze according to ASTM D1003 of less than 2.0% at 23° C. and a haze according to ASTM D1003 of less than 4.0% at 40° C. and the composition containing at least one (meth)acrylate (co)polymer a) having a solution viscosity in chloroform at 25° C. (ISO 1628—part 6) of greater than 55 ml/g.

The mouldings obtainable from the composition are distinguished in particular by improved stress cracking resistance and are suitable in particular for coverings, finishes or films.

The invention relates to whisker modified polymethacrylimide foamed plastic, which is prepared from the following raw materials in part by weight: 30 to 70 parts of acrylic acid or methacrylic acid, 30 to 70 parts of acrylonitrile or methacrylonitrile, 0.1 to 20 parts of whisker material, 0.1 to 5 parts of thixotropic agent, 0.1 to 6 parts of nucleating agent, 0.05 to 2 parts of initiator, 0.1 to 15 parts of foaming agent, 0.01 to 2 parts of cross-linking agent and 0.01 to 0.7 part of retarding agent. The invention also relates to a preparation method of the foamed plastic, which comprises the following steps of: (1) mixing the raw materials; (2) performing polymerization reaction on the materials obtained in the step (1); (3) heating a plate prepared in the step (2), and preheating and foaming; and (4) heating the foamed plate prepared in the step (3). The combustibility and smoke density of the foamed plastic are reduced, and the foamed plastic is a plastic material with high performance.

The invention relates to a composition containing, in relation to the total weight of said composition, A) between 50.0% by weight and 99.5% by weight of at least one (meth)acrylate (co)polymer and B) between 0.5% by weight and 50.0% by weight of at least one copolymer, obtained by the polymerisation of a monomer mixture consisting of i. between 70% by weight and 92% by weight of a vinyl aromatic monomer and ii. between 8% by weight and 30% by weight of acryl nitrile or methacryl nitrile or mixtures thereof iii. between 0% by weight and 22% by weight of at least one other monomer, the composition having at 50° C. a ΔE of less than 0.15, ΔE being defined according to the relationship (1): (1) in which ΔL*: the modification of the colour co-ordinates L* compared with the colour co-ordinates L* at 23° C., Δa*: the modification of the colour co-ordinates a* compared with the colour co-ordinates a* at 23° C., Δb*: the modification of the colour co-ordinates b* compared to the colour co-ordinates b* at 23° C., and the composition contains at least one (meth)acrylate (co)polymer a) with a solution viscosity in chloroform at 25° C. (ISO 1628 part 6) greater than 55 ml/g. The moulded bodies that can be obtained from the composition are characterised in particular by improved stress cracking resistance and are suitable in particular for use in coatings, paints or films.

Provided are a block copolymer including a polymer block containing acrylonitrile or methacrylonitrile as a principal constituent, which is excellent in heat resistance, weatherability, oil resistance, flame retardancy, and low-temperature resistance and which can be economically produced; and a thermoplastic resin composition and an elastomer composition each containing the block copolymer. The block copolymer is produced by reversible addition-fragmentation chain transfer polymerization in the presence of a thiocarbonylthio group-containing compound.

A slurry composition for electrode comprising a binder, an active material, and a liquid medium, characterized in that the binder comprises a polymer (X) comprising 60 to 95 mole % of repeating units derived from acrylonitrile or methacrylonitrile and 5 to 30 mole % of repeating units derived from at least one kind of a monomer selected from 1-olefins and compounds represented by the following general formula (1): CH₂═CR¹—COOR² wherein R¹ represents a hydrogen atom or a methyl group and R² represents an alkyl group; and the liquid medium is capable of dissolving the polymer (X). The slurry composition allows the manufacture of a lithium ion secondary battery having enhanced capacity and good charge-discharge cycle characteristics and good charge-discharge rate characteristics.

The invention discloses a method for preparing a graphene reinforced PMI (polymethacrylimide) foam material. Graphene is taken as a reinforcing material, methacrylonitrile and methacrylic acid are taken as a comonomer, an initiator, a crosslinking agent, a foaming agent, a nucleating agent and the like are added to prepare a foamable polymerized plate, and finally the foamable polymerized plate is freely foamed and subjected to thermal treatment in a drying oven so as to prepare polymethacrylimide rigid foam. Reactions of crosslinking, cyclization and the like are sufficiently conducted in the foaming and thermal treatment process, so as to harden copolymer molecular chain, and finally the foam plastic with excellent property is prepared. Due to adoption of the method, the tensile strength, the bending strength, the compression strength and the shearing strength of PMI are improved, and the electromagnetic shielding property and the anti-static property of the PMI foam are also improved. The PMI foam with excellent mechanical property can be widely applied to manufacturing of foam interlayer components in the fields of spaceflight, aviation, vessels, trains and the like.

A catalyst comprising a complex of catalytic oxides comprising potassium, cesium, cerium, chromium, cobalt, nickel, iron, bismuth, molybdenum, wherein the relative ratios of these elements is represented by the following general formula AaKbCscCedCreCofNigXhFeiBijMo12Ox wherein A is Rb, Na, Li, Tl, or mixtures thereof, X is P, Sb, Te, B, Ge, W, Ca, Mg, a rare earth element, or mixtures thereof, a is about 0 to about 1, b is about 0.01 to about 1, c is about 0.01 to about 1, d is about 0.01 to about 3, e is about 0.01 to about 2, f is about 0.01 to about 10, g is about 0.1 to about 10, h is about 0 to about 4, i is about 0.1 to about 4, j is about 0.05 to about 4, x is a number determined by the valence requirements of the other elements present, and wherein the catalyst is substantially free of manganese and zinc. The catalyst is useful in processes for the ammoxidation of an olefin selected from the group consisting of propylene, isobutylene or mixtures thereof, to acrylonitrile, methacrylonitrile and mixtures thereof, respectively.

A catalytic composition useful for the conversion of an olefin selected from the group consisting of propylene, isobutylene or mixtures thereof, to acrylonitrile, methacrylonitrile, and mixtures thereof. The catalytic composition comprising a complex of metal oxides comprising bismuth, molybdenum, iron, cerium and other promoter elements, wherein the X-ray diffraction pattern of the catalytic composition has X-ray diffraction peaks at 2θ angle 28±0.3 degrees and 2θ angle 26.5±0.3 degrees, and wherein the ratio of the intensity of the most intense x-ray diffraction peak within 2θ angle 28±0.3 degrees to the intensity of most intense x-ray diffraction peak within 2θ angle 26.5±0.3 degrees is defined as X/Y, and wherein X/Y is greater than or equal to 0.7.

The invention relates to an anode of a lithium ion battery, which comprises a current collector and an anode material on the current collector. The anode material contains an anode active material and a binding agent, wherein the binding agent comprises a first polymer and a second polymer. The first polymer contains fluorine with a functional group, and the second polymer contains at least a cell of acrylonitrile cell, a methylacrylonitrile cell, an acrylic acid ester cell and a methacrylic acid ester cell. The invention also provides the lithium ion battery containing the anode. The anode of the lithium ion battery provided by the invention can improve the specific capacity, rate performance and cycle performance of the battery.

A catalyst composition comprising molybdenum, vanadium, antimony niobium, at least one element select from the group consisting of titanium, tin, germanium, zirconium, and hafnium, and at least one lanthanide selected from the group consisting of lanthanum, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; with the proviso that catalyst contains germanium (in the absence of at last one of titanium, tin, zirconium, hafnium) only in combination with neodymium and/or praseodymium and no other lanthanides. Such catalyst compositions are effective for the gas-phase conversion of propane to acrylonitrile and isobutane to methacrylonitrile (via ammoxidation).

The invention discloses a polymethacrylimide foam material and a preparation method thereof. The preparation method comprises the following steps: mixing a propylene monomer containing carboxyl, a propylene monomer containing acylamino, a polymerization initiating agent, a foaming agent and a cross-linking agent according to a proportion in parts by weight; electrically stirring or magnetically stirring to obtain uniform mixed liquid; pouring the mixed liquid into a sealed glass container to pre-polymerize so as to obtain a transparent block; and then hot processing to obtain the polymethacrylimide foam material. The propylene monomer containing the carboxyl and the propylene monomer containing the acylamino are used as main monomers to prepare the polymethacrylimide foam material by prepolymerization and hot processing without any virulent (methyl) acrylonitrile after being mixed. The invention has the advantages of simple and convenient working procedures and great production cost reduction. The prepared polymethacrylimide foam material can be directly widely applied to the fields of aerospace, carrier rockets, railway locomotives, ships, wind power generating blades, sports goods, and the like.

This invention aims to provide a thermally foamable microsphere which is excellent in heat resistance, has a high expansion ratio, and shows stable foaming behavior; a method of producing the thermally foamable microsphere; and suitable use thereof.

This invention provides a thermally foamable microsphere in which an outer shell encapsulating a foaming agent is formed of a copolymer having a polymethacrylimide structure. In particular, this invention provides a thermally foamable microsphere in which monomers capable of forming the polymethacrylimide structure by a copolymerization reaction are methacrylonitrile and methacrylic acid. Moreover, this invention provides a method of producing the thermally foamable microsphere and use of the thermally foamable microsphere as an additive.