271 results about "4-Methyl-1-pentene" patented technology

Copolymers, especially multi-block copolymer containing therein two or more segments or blocks differing in chemical or physical properties, are prepared by polymerizing propylene, 4-methyl-1-pentene, or other C4-8α-olefin and one or more copolymerizable comonomers, especially ethylene in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

Novel transparent composites composed of single wall carbon nanotubes incorporated into the matrix of a polymer are utilized in services wherein the composites are exposed to ionizing radiation, including galactic cosmic radiation. Accordingly, the composites are useful in deep space applications like space vehicles, space stations, personal equipment as well as applications in the biomedical arts and atom splitting research. The composites can be modified with organic dyes containing at least one phenyl ring and the resulting doped composite is useful as a radiation detector. The preferred polymer is poly(4-methyl-1-pentene).

The invention discloses a capacitor film with low density polyethylene as substrate and a preparation method thereof. The capacitor film comprises the following raw materials by weight: 50-55 parts of LDPE (low density polyethylene), 20-25 parts of LLDPE (linear low density polyethylene), 10-15 parts of homo-polymer, 3-5 parts of epoxy linseed oil, 2-3 parts of polyvinyl alcohol, 1-2 parts of aluminum hydroxide, 1-2 parts of polyisobutylene, 8-12 parts of diatomite, 1-2 parts of ferrocene, 0.8-1.2 parts of poly-4-methyl-1-pentene, 5-10 parts of calcium carbonate, 2-4 parts of hydrotalcite, 1.3-1.8 parts of zinc dialkyl dithiophosphate, 0.4-0.6 part of phthalic acid ester, 0.4-0.7 part of smoke sheet rubber, 1-3 parts of zinc stearate and 0.9-1.3 parts of modified wood ash. The invention mainly adopts low density polyethylene assisted with linear low density polyethylene; and various accessories and additives are subjected to mixing and extrusion, blown film sizing and cutting to prepare the capacitor film. The preparation method is simple; and diatomite, hydrotalcite and modified wood ash are added into the raw materials at the same time to enhance barrier property and air tightness of the film; besides, the capacitor film has characteristics of good pressure resistance, impact resistance, high heat sealing strength, and good heat sealing performance.

The invention discloses a heat aging-resisting and low-pressure change sulfur vulcanized EPDM (Ethylene-Propylene-Diene Monomer) rubber composition, a preparation method, application and an application product thereof. The composition is prepared from 100 parts of EPDM rubber, 50 to 130 parts of carbon black, 10 to 60 parts of paroline, 2 to 8 parts of zinc oxide, 0.5 to 3 parts of stearic acid, 1 to 6 parts of an anti-aging agent, 0.2 to 1 part of sulfur and 1 to 6 parts of an accelerator. Compared with a sulfur vulcanized EPDM rubber composition prepared in the prior art, the composition has the advantages that heat aging resistance and low compression set are remarkably increased, and the composition is applied to rubber products having the requirements on heat aging resistance and low pressure change, and is particularly applied to an outer adhesive layer of a rubber hose which adopts a poly-4-methyl-1-pentene (TPX) coating and vulcanizing technology; meanwhile, the preparation method of the composition is simple, the vulcanization temperature is lower, and the purpose of saving energy is achieved.

A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [η] is 0.5 (dl / g) or greater.

Provided are: a mold release film, which has excellent mold releasability to a semiconductor resin package and does not easily generate warpage, wrinkles and the like; and a method for obtaining a semiconductor resin package having excellent dimensional accuracy by using such mold release film. The mold release film for manufacturing a semiconductor resin package has one or more base material layers (C), a pair of outermost layers (A) which sandwich the base material layers (C) and contain a 4-methyl-1-pentene polymer as a main component, and a pair of adhesive layers (B) which adhere together the base material layers (C) and the outermost layers (A).

The invention relates to a method for preparing a modified atmosphere fresh-keeping film for fruits and vegetables. The fresh-keeping film is prepared by compounding an ethylene absorption and decomposition agent with gas absorbency and resin. The modified atmosphere fresh-keeping film comprises the following components in percentage by weight: 60 to 80 percent of poly(4-methyl-1-pentene) resin, 10 to 20 percent of low-density polyethylene, 2 to 5 percent of inorganic moisture-penetrating agent and 0.1 to 5 percent of ethylene absorption and decomposition agent. The modified atmosphere fresh-keeping film has the advantages of retarding the metabolic ageing of the fruits and the vegetables and prolonging the quality guarantee periods of the fruits and the vegetables, along with high carbon dioxide and oxygen permeability, high moisture-penetrability, ethylene absorption and decomposition functions, and relatively better fresh-keeping effects on the fruits such as bananas, apples and the like.

Copolymers, especially multi-block copolymer containing therein two or more segments or blocks, are prepared by polymerizing propylene, 4-methyl-1-pentene, or another C4-8 α-olefin in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers having increased incidence of regio-irregular branching compared to the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.

A multilayered 4-methyl-1-pentene copolymer film which is a laminate comprising layers (A) made of a 4-methyl-1-pentene copolymer and a layer (B) made of polypropylene or polyethylene and optionally further having one or more layers (C) made of an adhesive resin, the layers (A) being disposed respectively on both sides of the layer (B) optionally through the layers (C), the film having been monoaxially stretched at least 2 times or having been biaxially stretched at least 1.5 times in each of the machine and transverse directions. The multilayered film has satisfactory stretchability in production, has high rigidity, and has satisfactory releasability from blackened copper foils. It is suitable for use as a release film for MLB production.

The invention discloses an impact-resistance-modified polyvinyl chloride composite material which is prepared from polyvinyl chloride, polyurethane, methyl methacrylate-butyl acrylate copolymer, polystyrene, polytetrafluoroethylene, nano graphite microsheets, magnesium hydroxide, zinc stannate, zinc borate, chlorinated paraffin, organic modified montmorillonite, poly-4-methyl-1-amylene, sulfonated polyethersulfone, methyl tin mercaptide, epoxy soybean oil, pentaerythritol, tri(2,4- di-tert-phenyl) phosphite, hexamethyl phosphoric triamide and triethyl phosphate. The impact-resistance-modified polyvinyl chloride composite material disclosed by the invention has the advantages of favorable toughness, excellent impact resistance, excellent processability, high flame retardancy and favorable antistatic property.

The invention discloses an oil-proof anti-static polyvinyl chloride pipe. The polyvinyl chloride pipe comprises the following raw materials in part by weight: 100 parts of polyvinyl chloride, 10-30 parts of chloride polyethylene, 1-10 parts of ethylene-propylene-diene monomer, 1-3.5 parts of zinc oxide modified graphene oxide, 2-10 parts of zinc borate, 3-10 parts of aluminium hydroxide, 2-5 parts of coupling agent modified diatomite, 0.5-1.5 parts of antimony pent(iso-octyl thioglycollate), 1-2.5 parts of N-isopropyl-N'-phenyl p-phenylenediamine, 1-3 parts of calcium stearate, 1-2.5 parts of lanthanum stearate, 1-5 parts of epoxy soybean oil, 5-10 parts of polyethylene wax, 5-15 parts of poly-4-methyl-1-pentene, 0.5-2 parts of trioctyl trimellitate, and 1-5 parts of 2,4-bis(1,1-dimethylethyl)-pheno phosphite. The oil-proof anti-static polyvinyl chloride pipe disclosed by the invention has excellent oil resistance and static resistance, and is low in cost and good in processing property.