6606 results about "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 filler rod for occupying space in a stranded optical fiber communications cable having at least one buffer tube containing at least one optical fiber is disclosed. The filler rod comprises an elongated rod extruded from a polypropylene homopolymer, a polypropylene-polyethylene copolymer (i-PP) resin material, or preferably, from a polypropylene-polyethylene copolymer having a nucleating agent disbursed therein. The resin material is foamed during extrusion so as to have a plurality of void spaces therein and a relative density which is less than 1 relative to the unfoamed resin material. As compared to rods made from high density polyethylene, the i-PP filler rods show a greater foaming efficiency, more efficient use of material, an improved combination of mechanical properties and density, reduced post-extrusion shrinkage and a substantial reduction in the sticking of the filler rods to the outer jacket that is experienced with high density polyethylene filler rods.

A resealable cap (110, 210) for a medicament vial (114, 214) has a base portion (112, 212) formed of vulcanized rubber or like material known for providing a stable environment for the medicament contained within the vial, and a resealable portion (126, 226) overlying the base portion. The resealable portion (126, 226) is made of low-density polyethylene or like material, and can be punctured by a needle or like injection member (140, 282) for dispensing medicament into the vial (114, 214). Prior to filling, the cap (110, 210) is assembled to the vial (114, 214) and the cap/vial assembly is sterilized. Then, a needle (140, 282) is inserted through the cap (110, 210) and medicament is introduced through the needle and into the vial. Upon withdrawal of the needle (140, 282), the penetrated region of the cap (248) is fused by laser (276) or direct heat sealing (264) to hermetically seal the needle hole (294) in the cap.

A flame retardant composition comprising(A) about 50 to about 95 percent by weight of at least one ethylene co-polymer selected from an ethylene/vinyl ester copolymer; ethylene/alpha, beta unsaturated carboxylate copolymer; and very low density ethylene/alpha-olefin copolymer; and(B) about 5 to about 50 percent by weight of an ethylene/alpha-olefin copolymer having been prepared with a single site catalyst, and, for each 100 parts by weight of component (A) and component (B) combined,(C) about 2 to about 50 parts by weight of a polyethylene modified with a functional group containing compound;(D) about 5 to about 250 parts by weight of a metal hydrate;(E) about 1 to about 12 parts by weight of a triazine ring containing compound; and(F) about 0.5 to about 5 parts by weight of a flame retardant compound selected from the group consisting of a boron compound, a molybdenum compound, and a silicone.

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 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.

A pipe composition comprising, in one embodiment, from 80 to 99 wt % of a high density polyethylene by weight of the composition and from 1 to 20 wt % of a filler by weight of the composition; the polyethylene having a density of from 0.940 to 0.980 g/cm³, and an 121 of from 2 to 18 dg/min; characterized in that the pipe composition extrudes at an advantageously low melt temperature and at an advantageously high specific throughput. Also provided is a method of forming a pipe comprising in embodiment providing a filler composition comprising from 5 to 50 wt % of a filler and from 95 to 50 wt % of a low density polyethylene and from 0 to 3 wt % of one or more stabilizers; then melt blending the filler composition and a high density polyethylene having a density of from 0.940 to 0.980 g/cm³, and an I₂₁ of from 2 to 18 dg/min to a target drop temperature of from 16° C. to 185° C. to form a pipe composition, melt blending such that the pipe composition comprises from 1 to 20 wt % of the filler by weight of the pipe composition; and extruding the pipe composition to form a pipe.

The invention relates to high-voltage DC cable insulating material and a preparation method thereof in the technical field of the insulating material. The preparation method is that: 100 weight portions of low-density polyethylene, 0.1-1 weight portion of anti-oxidizer, 0.5-5 weight portions of nano inorganic powder and 0.2-5 weight portions of maleic anhydride are placed into and mixed and compounded in a banbury mixer; the temperature of mixing and compounding is 373K to 378K and the mixing and compounding time is 10 to 15 minutes; 0.1-5 weight portions of cross-linking agent is added into the mixture and is mixed and compounded under the temperature of 373K to 378K for 10 to 15 minutes; then, the high-voltage DC cable insulating material is obtained; wherein, the density of the low-density polyethylene is less than 0.9g/cm<3>. The insulating material of the preparation method can effectively improve the mechanical and electric properties of the high-voltage DC cable, thus avoiding the disadvantage that the environment is polluted and damaged by an oilpaper insulating cable due to the leakage of the insulating oil.

The invention provides an antibacterial master batch based on a guanidinium polymer and a preparation method thereof. The antibacterial master batch comprises the following blended components: a matrix resin, a composite antibacterial agent and a dispersant, wherein, on the basis of 100 parts by weight of the matrix resin, the composite antibacterial agent is 10 to 30 parts by weight, the dispersant is 2 to 10 parts by weight, the matrix resin is at least one selected from the group consisting of low-density polyethylene and high-melt index polypropylene, and the composite antibacterial agentis a polyguanidine/polysilicate composite antibacterial agent and is prepared by mixing an aqueous solution of water-soluble polyguanidine inorganic acid salt or organic acid salt with an aqueous solution of water-soluble silicate and adding an aqueous solution of water-soluble metal salt. The antibacterial master batch is used for antimicrobial modification of polypropylene, and addition amount of the antibacterial master batch is 2 to 10 wt % of the matrix material polypropylene; prepared modified polypropylene has the advantages of high antibacterial efficiency, a white color, good washingfastness, etc.

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 an expandable polypropylene bead and a preparation method of the expandable polypropylene beads, and also provides foaming beads and foaming molding products of the expandable polypropylene beads, which relates to the resin expandable beads technical field. Random copolymerized polypropylene is used as basic resin, so that melting intensity can reach to an ideal range when in foaming with high melting intensity polypropylene and low density polyethylene resin being added. Expandable beads are prepared in a closed reactor without external pressure with pentane being used as foaming agent. The expandable beads contain 1 to 15 parts by weight of the high melting intensity polypropylene, 1 to 10 parts by weight of the low density polyethylene, 1.0 to 3.8 parts by weight of the foaming agent and 0.1 to 10 parts by weight of nucleating agent on the basis of 100 parts by weight of the random copolymerized polypropylene. The expandable polypropylene beads are easy to foam, whose foaming rate can reach to 16 times with uniform cells and whose foam volume weight is about 0.05 to 0.12g/cm3. The invention adopts a low-pressure method to produce the polypropylene foaming products in different shapes according to the requirement with low equipment requirement and low cost.

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.

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.