3771 results about "Linear low-density polyethylene" patented technology

This invention relates to blends of linear low density polyethylene copolymers with other linear low density polyethylenes or very low density, low density, medium density, high density, and differentiated polyethylenes. The invention also includes articles produced from the linear low density polyethylene and polyethylene blends described.

A paper packaging container is formed from the packaging material comprising constitution layers of at least an outside thermoplastic material layer, a paper substrate layer, and an inside thermoplastic material layer, wherein the inside thermoplastic material layer contains at least a linear low density polyethylene, and has properties parameters of an average density of 0.900–0.930, a predetermined peak melting point, a melt flow index of 5–15, and a swelling ratio of 1.3–1.8. The use of the packaging material allows easy filling and packaging to the packaging container and quick heat sealing, and results in more toughly and strongly sealed container, and the material can be used for achieved good sealing independently of the temperature of food contents and thus maintaining the non-scalping and quality preservability of the content product.

Provided are ethylene-based polymer compositions, articles made therefrom, and methods of making the same. Ethylene-based polymer compositions include blends of a linear low density polyethylene prepared with metallocene catalyst and a low density polyethylene. The linear low density polyethylene may optionally have about five mole percent or less of monomer units derived from an alpha-olefin comonomer. Articles composed of such ethylene-based polymer compositions, such as blown films, exhibit favorable physical properties, including excellent optical properties and retained strength i.e., mitigation of expected decline in physical strength due to LDPE addition.

Provided herein is a composite, comprising: a polymer host selected from the group consisting of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), and polypropylene (PP), polyurethane, polycaprolactone (PCL), polydimethylsiloxane (PDMS), polymethylmethacrylate (PMMA), and polyoxymethylene (POM); and a guest molecule comprising hyaluronic acid; wherein the guest molecule is disposed within the polymer host, and wherein the guest molecule is covalently bonded to at least one other guest molecule. Also provided herein are methods for forming the composite, and blood-contracting devices made from the composite, such as heart valves and vascular grafts.

The invention discloses methods of improving blocking resistant properties and reducing the coefficient of friction of a multilayer film comprising providing at least one layer of an ethylene-propylene impact copolymer having from about 3% to about 30% by weight ethylene, wherein said copolymer has no more than two peaks in the melting curve within the range from about 110° C. to about 165° C., and wherein said layer is non-heat sealable, to a multilayer film having a core layer comprising polypropylene, high density polyethylene (HDPE) or linear low density polyethylene (LLDPE), whereby anti-blocking and coefficient of friction characteristics of said film is improved without necessity of adding an antiblock or slip agent.

The invention relates to a preparation method of recycled polyester chip microfilaments and a usage thereof, belonging to the field of plastic modification and category of composite material/alloy promoter. The polyester chip microfilament is an ideal promoter which has excellent performance, environment-friendliness, high added value, wide application range and broad market prospect and can change the mechanical property of the composite material/alloy. Recycled blow molding polyester (RPET/RPBT) is taken as main raw material, and the following formula and process are adopted for preparing the microfilament according to parts by weight: 100 parts of recycled polyester (RPET/RPBT), 5-30 parts of wire-drawing high-density polyethylene (HDPE)/ polypropylene (PP)/ linear low-density polyethylene (LLDPE), 0.1-4 parts of crosslinking agent/ chain extender/anchoring agent, 0.1-0.8 part of antioxidant, 0.5-6 parts of nucleating agent, and 1-5 parts of nucleate accelerant, and other processing aids (such as lubricant and plasticizer)/functional aids (such as fire retardant and ultraviolet absorber) can be additionally and appropriately added. The microfilament is prepared through extrusion, cooling, drawing and granulating by the reaction under 90-260 DEG C under the action of mechanical shear. The recycled polyester (RPET/RPBT) microfilament prepared in the invention can endow the composite material/alloy with excellent mechanical property.

The invention provides a low density paperboard material for use in producing an insulated container, and is especially well-suited for making cups. The paperboard material comprises a paperboard web including wood fibers and expanded microspheres, and has a relatively low density ranging from about 6 to about 10 lb/3MSF/mil, a relatively high caliper ranging from about 24 to about 35 mil, and an internal bond strength of at least about 80×10⁻³ ft-lb_f preferably at least 100×10⁻³ ft-lb_f. For applications such as cups the material is also coated on one or both sides with a barrier coating, preferably low density polyethylene, to limit liquid penetration into the web. The low density paperboard material of the invention is convertible for manufacture of containers, particularly cups, and the surface of the low density board may have a Sheffield smoothness of 300 SU or greater.

The invention discloses an antibacterial polyethylene film and a method for preparing the same. The film consists of an outer layer, a middle layer and an inner layer; the outer layer consists of low-density polyethylene and linear low-density polyethylene; the middle layer consists of low-density polyethylene and linear low-density polyethylene; and the inner layer comprises low-density polyethylene, linear low-density polyethylene, metallocene linear low-density polyethylene, a slipping agent and an antibacterial agent. Compared with the prior art, the antibacterial polyethylene film has the characteristics of broad-spectrum sterilization, lasting antibacterial effect, good safety, no toxicity, no side effects and uneasy discoloration, thereby really achieving the protective function on packaged foods.

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.

Electronic packaging films, tapes, bags and pouches having excellent optical properties and heat sealability, low hexane extractables and a good balance of physical properties may be prepared from linear low density polyethylene having a melt flow ratio (I₂₁/I₂) from about 23 to about 32, prepared in a tandem dual reactor solution phase polymerization in the presence of a phosphinimine catalyst and a co-catalyst system which comprises an aluminum based co-catalyst, an ionic activator or a mixture thereof.

The invention discloses a soft low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof. The cable material comprises the following components (based on by mass part ratio): 80-90 parts of copolymer of ethylene-vinylacetate, 10-20 parts of linear low-density polyethylene, 65-130 parts of an inorganic fire retardant through surface treatment, 10-30 parts of high-effective flame retardant synergist, 10-20 parts of high molecular compatilizer, 0.9-1.5 parts of antioxidant and 1-2 parts of processing aid. The preparation method comprises the steps of resin blending extrusion; surface treatment of the inorganic fire retardant; batching, mixing, extrusion, granulation and the like. Compared with the prior art, the invention has the characteristics of predominant flame retardation (an oxygen index up to 36), excellent toughness, excellent bending resistance, low density (density is only 1.28g/cm<3>), low smoke, low corrosion, low toxicity, environmental protection, good processability, bright surface of extrudates and the like.

We disclose a shrink film comprising a first layer comprising a monovinylarene-conjugated diene copolymer; a second layer comprising low density polyethylene (LDPE) and linear low density polyethylene (LLDPE); and a third layer comprising a monovinylarene-conjugated diene copolymer; wherein the second layer is disposed between the first layer and the third layer. We also disclose methods of using the shrink film to prepare bundled or fully enclosed groups of objects.

The invention provides a low-smoke halogen-free inflaming-retarding cable material and preparation method thereof. The cable material comprises 5 to 15 parts (part by weight) of compatilizer that comprises maleic anhydride functional group grafted ethylene-vinyl acetate copolymer and maleic anhydride functional group grafted ethylene propylene terpolymer; 85 to 95 parts of base material formed by blending two or more than two of linear low-density polyethylene, ethylene-vinyl acetate copolymer and ethylene propylene terpolymer granular materials; 2 to 6 parts of composite antioxidant composed of the following antioxidants in terms of weight ratio: hindered phenol antioxidants : thiol ester antioxidants = 1 : (2 to 6); 20 to 40 parts of ammonium polyphosphate; 10 to 20 parts of pentaerythritol; 8 to 15 parts of melamine; 50 to 100 parts of composite inorganic fire retardant composed of the following fire retardants: magnesium hydroxide : zinc borate = (2 to 4) : 1; 2 to 6 parts of lubricant; 0 to 0.5 parts of metal passivator; 0 to 3 parts of crosslinking assistant agent; and 0 to 5 parts of halogen-free master batch. The invention has provided a harmless halogen-free inflaming-retarding cable material having high temperature tolerance, high tension, high elongation and high fire resistance.

A flexible thermoplastic composition comprises poly(arylene ether); a plasticizer having an affinity for polyolefin; a polyolefin and a hydrogenated block copolymer of an alkenyl aromatic compound and a conjugated diene, wherein the polyolefin comprises (i) an ethylene/C₇-C₂₀ alpha olefin copolymer having an alpha olefin content greater than or equal to about 10%, (ii) a thermoplastic vulcanizate (iii) a combination of linear low density polyethylene and a thermoplastic vulcanizate, (iv) a combination of an ethylene/C₇-C₂₀ alpha olefin copolymer having an alpha olefin content greater than or equal to about 10%, a linear low density polyethylene, and a thermoplastic vulcanizate, (v) a combination of an ethylene/C₇-C₂₀ alpha olefin copolymer having an alpha olefin content greater than or equal to about 10% and a thermoplastic vulcanizate or (vi) a combination of an ethylene/C₇-C₂₀ alpha olefin copolymer having an alpha olefin content greater than or equal to about 10% and linear low density polyethylene.

The invention relates to a thermoplastic oil-resistant halogen-free low-smoke flame-retardant polyolefin cable material. The material is characterized in that: the material is prepared from raw materials of: substrate resin, a fire retardant, a lubricating agent, and an anti-oxidant. The substrate resin is composed of metallocene linear low-density polyethylene (MLLDPE), an ethylene-vinyl acetate polymer, and an interface compatibilizing agent. The preparation method comprises the steps that: the raw materials are well mixed in a high-speed mixing machine; the mixture is subjected to mixed extrusion under a processing temperature of 125-145 DEG C on a same-direction double-screw extruder; and the material is subjected to hot-cut granulation, such that a finished product is obtained. Compared with a traditional thermoplastic halogen-free low-smoke flame-retardant polyolefin cable material, the cable material provided by the invention has good oil resistance. When the cable material is soaked in mineral oil, the change rates in tensile strength and breaking elongation are low.

This invention relates to the laminated material for food packaging, and its manufacturing process. The laminated material (10) consists of the quality keeping intermediate layer (12) laminated inside the paper core layer (11) and the core layer and the heat sealable innermost layer (13). The quality keeping intermediate layer comprises of an extrusion coatable blend polymer consisting of polymer component A 50-95% of nylon-MXD6 or EVOH and, polymer component B 5-50% of nylon 6, nylon 6, the blends or PET. The quality keeping intermediate layer is extruded and laminated directly in the core layer, the innermost layer contains at least the linear low density polyethylene which has a narrow molecular weight distribution, and has the properties parameter of mean density of 0.910-0.925, 100-122 degrees C. peak melting point, melt flow index of 5-20, swelling ratio (SR) of 1.4-1.6, and 5-50 micrometer layer thickness.

The hardness, production efficiency, and cost performance of the barrier packaging container formed by the packaging material are improved.

The invention belongs to the technical field of high molecule modification and processing and relates to a modified polypropylene material as well as a preparation method and application thereof. The material provided by the invention comprises the following components in parts by weight: 40-50 parts of bulk polypropylene, 20-35 parts of co-polypropylene, 15-24 parts of toughening agent, 0-15 parts of linear low-density polyethylene, 8-15 parts of filler retention aid, 6-12 parts of compatilizer, 0-8 parts of scratch-resistant smoothing agent, 0.5-1 part of lubricating agent, 3.5-5 parts of composite antioxidant and 1.5-3 parts of coupling agent. Compared with the prior art, the modified polypropylene material provided by the invention has the advantages of good rigidity, ductility, improvement on impact strength, heat resistance, ageing resistance, scratch resistance and excellent processing performance. The material provided by the invention can be widely applied to various interior trim parts of automobiles.

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.

The invention provides a cable semi-conductive shielding material which belongs to the field of electric cable fabrication technique and a preparation method thereof, and the components of the material and the content thereof are as follows: ethylene-vinyl acetate copolymer or linear low density polyethylene 100 proportion by weight, black carbon 10-50 proportion by weight, anti-oxidant 0.1-5 proportion by weight as well as cross linker 0.1-5 proportion by weight. The method provided by the invention can effectively inhibit accumulation of space charges in insulation material, and improves electric field threshold value of injected space charge, which reduces insulation material electric conductivity increased effect induced by space charge-limited current (SCLC), and the electric field distortion rate in XLPE is only 14-19% under -60kV/mm extra electric field for 60 minutes.

The invention discloses a rotational molding wear-resistant polyolefin resin and a preparation method thereof. In the rotational molding wear-resistant polyolefin resin, raw materials commonly used in the rotational molding process, namely linear low-density polyethylene, high-density polyethylene or polypropylene is taken as a matrix material; and by adding components of an inorganic filler, ultrahigh molecular weight polyethylene and a lubricant, the wear resistance of the matrix resin is improved. The rotational molding wear-resistant polyolefin resin consists of the following components in percentage by mass: 70 to 80 percent of matrix resin, 10 to 15 percent of inorganic filler subjected to surface treatment, 4 to 13 percent of ultrahigh molecular weight polyethylene and 1.5 to 2 percent of lubricant, wherein the matrix resin is the linear low-density polyethylene, the high-density polyethylene or the polypropylene; and a range of a melt flow rate of the matrix resin is between 2g/10min and 15g/10min.

A polyethylene heavy packaging film composite can be widely used for producing blisterpack, such as FFS package, large goods package, tray package and so on, which can effectively improve the all round performance of packaging film, and make the package of goods more beauty, firm, green and effective. The film composite comprises: linear low density polyethylene accounting for 60-80% of the sum of the material, low density polyethylene accounting for 5-25% of the sum of the material, metallocene linear low density polyethylene accounting for 10-30% of the sum of the material, additive accounting for 3-7% of the sum of the material. An automatic feed proportioning system feeds the material of three extruders to die head and the heavy packaging film combination is obtained after three-layer extruding and mixing. The additive is combination of one or several kinds of slippery agent, antistatic agent, antioxidant, opening agent, thermal stabilizer.

The invention discloses an antistatic blocking resistant smooth linear low-density polyethylene composition based on LLDPE as base, which comprises the following parts: 0.05-0.2% opening agent, 0.05-0.3% smooth agent, 0.05-0.3% antistatic agent, 0.05-0.2% anti-oxidant and 0.05-0.2% manufacturing and heat stabilizer, wherein the opening agent contains inorganic blocking resistant agent or organic opening agent; the smooth agent is amide, soap or organic silicane; the main auxiliary anti-oxidant is hindered phenol and phosphorus anti-oxidant; the antistatic agent adopts composite pattern of non-ionic typed antistatic agent and ion-typed antistatic agent. The making method compress the following steps: adopting LLDPE as base; adding blended auxiliary material into graining stage; or graining auxiliary agent into mother grain; adding mother grain; manufacturing specific material.

A plastic fastening device that includes a recycled material. In one embodiment, at least a portion of the fastening device includes a blend of two or more thermoplastic resins, at least one of which is a recycled material. The blend may include, for example, a fresh thermoplastic resin and a recycled thermoplastic resin. The fresh thermoplastic resin may include, for example, one or more of a polyethylene (PE), a polyamide (PA), or a polycarbonate (PC). The recycled thermoplastic resin may include, for example, a recycled polyethylene terephthalate (rPET). In a preferred embodiment, the blend of two or more thermoplastic resins includes a blend of (i) rPET and (ii) one of a low-density polyethylene (LDPE), a LDPE/LLDPE (linear low-density polyethylene) blend and LLDPE, (iii) wherein the rPET constitutes about 88% to 98% of the total material content and the LDPE, the LDPE/LLDPE blend, or the LLDPE constitutes the balance.

The invention relates to adhesive resin with antiseptic function for steel pipe, which is prepared by HDPE, LLDPE, LDPE, PP, maleic anhydride, initiator, EVA, tackifier, antioxidant, color filler, and structural modifying agent with double-screws extruder. The product has high joint strength, and friend environment.