378results about How to "Good heat sealing performance" patented technology

The invention relates to a halogen-free flame-retardant acrylonitrile butadiene styrene (ABS) / polycarbonate (PC) alloy material for electrical engineering and a preparation method thereof. The halogen-free flame-retardant ABS / PC alloy material for electrical engineering comprises the following components in part by weight: 55 to 63 parts of ABS, 21 to 34 parts of PC, 2 to 7 parts of maleic anhydride grafted ABS compatilizer, 7 to 15 parts of organic phosphate flame retardant, 0.1 to 0.5 part of anti-dripping agent FA500B, 1.0 to 3.0 parts of organic silicon Dymgard and 0.2 to 0.5 part of composite antioxidant. In the preparation method, the halogen-free flame-retardant ABS / PC alloy material for electrical engineering is prepared by mixing, plastifying, extruding and pelleting at one step by using a double-single-screw double-step extruder. The comprehensive properties of the product can meet shell performance requirements of storage batteries special for subway engineering, electric locomotives and mobile stations.

An ethylenic copolymer composition including an ethylenic copolymer having Mw / Mn of 1.5 to 4, Mw of 3,000 to 1,000,000, and a resin density of 0.85 to 0.95 g / cm3. The relationship between the half width at the half maximum [W / 2] of the Gaussian distribution curve, and the average, n, of short-chain branches in the copolymer satisfies the equation,0.704+0.147n=W / 2=−0.055+0.577n. The ethylenic copolymer composition also includes an ethylenic copolymer having an Mw of 3,000 to 1,000,000 and a resin density of 0.85 to 0.95 g / cm3.

A propylenic polymer according to the present invention or a composition thereof have an excellent melt flowability and contains a less amount of stickiness-causing components, and also has a low modulus and is pliable, and is capable of providing a transparent molded article, thus being useful as a substitute for a pliable vinyl chloride resin. In addition, a molded article made therefrom exhibits an excellent heat seal performance at a low temperature, and is excellent in terms of transparency and rigidity. Specifically, it has an isotactic pentad fraction (mmmm), which indicates a stereoregulariry, of 30 to 80%, a molecular weight distribution (Mw / Mn) of 3.5 or less and an intrinsic viscosity [η] of 0.8 to 5 dl / g.

The polypropylene composite film of the present invention comprises (A) a crystalline polypropylene layer and (B) a propylene-1-butene random copolymer layer which is laminated on at least one surface of the crystalline polypropylene layer (A). The propylene / 1-butene random copolymer (B) has the following properties: (1) the copolymer comprises 50 to 95% by mol of constituent units derived from propylene and 50 to 5% by mol of constituent units derived from 1-butene, (2) the intrinsic viscosity is 0.1 to 5 dl / g, (3) the molecular weight distribution (Mw / Mn) is not less than 3, and (4) the parameter B value is 1.0 to 1.5. The crystalline polypropylene layer (A) of this composite film may be unstretched, monoaxially stretched or biaxially oriented. The polypropylene composite film has excellent heat-sealing properties, such as low-temperature heat-sealing properties and heat-sealing strength, and hot tack properties. The polypropylene composite film is almost free from surface tackiness and shows good slip properties and high blocking resistance at high temperatures, so that it is suitable for high-speed packaging. In addition, this composite film also has good transparency and scratch resistance. The polypropylene composite film of the invention having the above-mentioned excellent properties can be favorably used for packaging of foods, fill packaging and fiber packaging.

A multi-layer biaxially oriented high density polyethylene (OHDPE) film with a novel formulation which exhibits superior heat seal properties is disclosed. This improved formulation comprises a blend of a single grade of high density polyethylene (HDPE) or several grades of high density polyethylene (HDPE) with a nucleating agent (NA) used in the core layer to achieve a lower sealing initiation temperature, higher heat seal strength and broader sealing temperature range HDPE-based film that still exhibits typical properties of OHDPE films and a lower haze than conventional OHDPE films. The multi-layer BOPP film has additional layers such as a third polyolefin resin-containing layer, a metal layer, or combinations thereof.

The invention relates to a high temperature resistance film for blister package of medical sterilization equipment and a preparation method thereof. The first layer of the film is a heat-sealing layer A, and comprises blending resin of block copolymerized polypropylene and metallocene catalyzed polypropylene (mPP), wherein, the melting point of the block copolymerized polypropylene is more than 131 DEG C; the dosage of the mPP accounts for 20 to 50 percent of the blending rein by weight; the second layer of the film is a secondary inner layer B, and comprises homopolymerized polypropylene; the third layer of the film is an intermediate layer C, and comprises homopolymerized polypropylene; the fourth layer of the film is a binding layer D, and comprises polypropylene grafted by maleic anhydride; and the fifth layer is a weather resistance layer E, and comprises nylon 6 or 66. The film is prepared by adopting a bottom blowing water cooling type co-extrusion process or a casting method, wherein, after plastic is sufficiently melted, is inflated or cast by a die, the plastic is cooled at water temperature of between 15 and 18 DEG C. The preparation method is simple, and the product can endure high temperature steam sterilization for long time, and has good heat-sealing performance of dialyzing paper.

The invention relates to a shrink package color film and a production method thereof. The shrink package color film comprises a color printing layer and a heat shrinkage film. For the heat shrinkage film, MPE metallocene polyethylene is employed and LDPE high pressure polyethylene, HDPE low pressure polyethylene and LLDPE linear low density polyethylene with different melt indexes are cooperatively used, so the shrink package color film provided by the invention has high resistance to impact and tear, high transparency and good heat sealability; thus, the shrink package color film is thinner and has more uniform thickness, packaging requirements of high-quality products are met, and production cost is reduced.

The invention discloses a modified atmosphere freshness-retaining method for strawberry. Freshly picked strawberry is pre-cooled and put in a packaging container and the mixed gas of oxygen, carbon dioxide and nitrogen is introduced into the packaging container to lead the nitrogen concentration to be 85-95%, the oxygen concentration to be 1-8% and the carbon dioxide concentration to be 1-6%. The packaged strawberry is put in a refrigerator for cold storage at the temperature of 0-2 DEG C. The method leads the strawberry which is liable to oxidation stain to keep fresh and unchanged color and taste within 25 days, thus the product quality is ensured.