1133 results about "BoPET" patented technology

Disclosed is a biaxially stretched multilayer polypropylene film wherein a front layer and back layer composed of a propylene polymer (a1) are respectively arranged on both sides of a biaxially stretched polypropylene film base layer (B) which is composed of a propylene polymer composition (A) obtained by adding an inorganic compound powder (a2) to the propylene polymer (a1). This biaxially stretched multilayer polypropylene film is characterized in that the front and back layers have a surface roughness (three-dimensional center plane average roughness SRa) of less than 0.08 [mu]m and a glossiness (incident angle: 60 degrees) of not less than 114%, and the multilayer polypropylene film has a total light transmittance of not more than 20% and a density of 0.40-0.65 g / cm<3>.

The invention provides a preparation method of copolymerization latex of polyvinylidene chloride and acrylate, which comprises that reacts raw materials polyvinylidene chloride monomer, second monomer, functional monomer, composite emulsifier, pH adjuster, initiator, seed latex, and water in inertia gas, 0.08-0.12MPa and 50-60DEG C, collects polyvinylidene chloride and acrylate copolymerization latex from reaction product. The inventive PVDC latex is white stably, without changing into yellow after coating, with high stability. The latex can be directly coated on surface of base material as BOPP, BOPET and PVC hard sheet, while the coated or coated and dried film has barrier property, damp proofness, fragrance protectiveness, chemical drug resistance, and fireproof or the like. The film is transparent for long time, without changing into yellow. The inventive product can be used in one-time environment-friend dinnerware and inner layer of paper package, as tobacco, food and drug.

The present invention provides a process for preparing high melt strength propylene polymer by direct polymerization, comprising that a propylene polymer with wide molecular weight distribution and containing “very high molecular weight fraction” can be prepared by controlling the species and ratios of the external electron donors in the Ziegler-Natta catalyst system at different reaction stages according to the requirment for different molecular weight fractions in the different propylene polymerization stage of the series operation, and said polymer has excellent mechnical properties, especially with very high melt strength. The present invention also provides a propylene homopolymer with high melt strength, comprising the following features: (1) the MFR is 0.2-10 g / 10 min at 230° C. with a load of 2.16 kg; (2) the molecular weight distribution Mw / Mn is 6-20; (3) the content of the fraction with a molecular weight higher than 5,000,000 is higher than or equal to 0.8 wt %; (4) Mz+1 / Mn is higher than or equal to 70. Said homopolymer can be used in the preparation of foam products, thermoforming products, biaxial stretching films, blown films and blow-molded products.

The present invention provides a propylene polymer composition for producing a biaxially oriented film, comprising propylene random copolymer and propylene homopolymer; wherein the propylene random copolymer is a copolymer of propylene and ethylene, optionally comprising one or more alpha-olefins of C4-C10; the propylene polymer composition has an overall isotacticity index, as determined by nuclear magnetic resonance method, of greater than or equal to 96.5%, and an ethylene content of greater than 0.3 wt %; and wherein, the melt flow rate of the propylene random copolymer is lower than that of the propylene homopolymer. The biaxially oriented polypropylene film produced by the propylene polymer composition of the present invention exhibits excellent physical properties, and has, in the absence of any stiffening agent, relatively higher modulus and stiffness. Moreover, the process for producing the biaxially oriented polypropylene film is featured with a good film-forming stability and a high film-forming stretching speed.

The invention relates to a preparation method of an electronic-grade polyimide film with low linear expansion coefficient. The method comprises the following steps that (1) the step-by-step condensation polymerization technology is used for obtaining polybasic block copolymerization polyamide acid glue solutions comprising one or more bar-shaped rigid chain sections containing para-benzene or biphenyl and one or more soft chain sections containing ether bonds or silicon-oxygen bonds and the like; (2) polyamide acid comprising one or more bar-shaped rigid chain structures containing para-benzene or biphenyl and polyamide acid comprising one or more soft chain structures containing ether bonds or silicon-oxygen bonds are independently compounded, and the two or more polyamide acid glue solutions different in rigidity and softness are mixed and compounded; (3) the compounded glue solutions are subjected to filtration, vacuum defoamation, casting filming, bidirectional stretching, chemical amidization or thermal amidization, infrared complete amidization, high-temperature thermal forming processing, corona processing and a reeling process, and therefore the electronic-grade polyimide film with the thickness being 7.5-125 micrometers, the linear expansion coefficient being 5-18ppm / DEG C, and good physical mechanical performance is obtained.

Disclosed is a process for producing a 3-layer co-extruded biaxially polypropylene (hereinafter as BOPP) synthetic paper of thickness 25-250 mum. More particularly, the invention relates to a process for producing a 3-layer biaxially-oriented PP synthetic paper by means of 3-layer co-extrusion wherein two different PP resin compositions are separately extruded by one primary and two secondary extruders first, and then are co-flowed by a same T-die to form a three layers coating sheet, and through cooling, biaxial orientation, corona treatment and winding to form a 3-layer co-extrusion synthetic paper of thickness 25-250 mum. The 3-layer structure of said 3-layer co-extrusion synthetic paper of thickness 25-250 mum can be made into three kinds, such as: paper sheet layer / foamed intermediate layer / paper sheet layer with double side paper sheet layer, paper sheet layer / foamed intermediate layer / resin layer with single side paper sheet layer and resin layer / foamed intermediate layer / resin layerwith double side high gloss resin layer.

The invention discloses a two-way stretch polylactic acid film capable of being directly thermally sealed and a preparation method of the two-way stretch polylactic acid film. The two-way stretch polylactic acid film comprises an A layer, a B layer and a C layer, which are sequentially arranged, wherein the A layer is a surface layer heat-seal layer, the B layer is a middle core layer, the C layer is an anti-adhesion layer. The preparation method comprises the steps of melting and extruding raw material sections of the layer A, the layer B and the layer C respectively at the temperature of 180 to 220 DEG C by virtue of a double-screw extruder, placing fused mass in a three-layer co-extrusion die head, casting the fused mass to form PLA sheets, preheating the PLA sheets, carrying out longitudinal stretch and cooling stereotyping on the PLA sheets, re-preheating the PLA sheets after the longitudinal stretch and cooling stereotyping, then transversely stretching the PLA sheets, carrying out stereotyping crystallization and cooling stereotyping on the PLA sheets, carrying out the pulling sectioning and corona treatment on the PLA sheets, and carrying out the coiling to prepare the two-way stretch polylactic acid film capable of being directly thermally sealed with thickness of 20 to 100 micrometers. The two-way stretch polylactic acid film capable of being directly thermally sealed can be directly produced on a BOPET production line, the prepared film can be directly thermally sealed, and the application range of the polylactic acid film can be enlarged.

It is an object of the present invention to provide a biaxially oriented laminated polyester film which has excellent dimensional stability to environmental changes such as temperature and humidity variations and excellent flatness and windability.The present invention is a biaxially oriented laminated polyester film comprising a film layer B on one side of a film layer A and having a surface roughness (RaB) on the film layer B side which is 1.0 nm or more larger than the surface roughness (RaA) on the film layer A side, whereinat least one of the film layers comprises an aromatic polyester (I) composed of a glycol component and a dicarboxylic acid component containing 5 mol % or more and less than 80 mol % of a recurring unit represented by the following formula (A):wherein RA is an alkylene group having 1 to 10 carbon atoms.

This invention relates to a coextruded, transparent, biaxially oriented polyester film comprising a base layer (B) and a heatsealable top layer (A) which is peelable from at least the APET side of an APET / CPET tray, the heatsealable and peelable top layer (A) consisting ofa) 50–95% by weight of polyester andb) 5–40% by weight of a polyester-incompatible polymer (=anti-PET polymer)based on the mass of the top layer (A), whereinc) the polyester is composed of 20–95 mol % of units derived from at least one aromatic dicarboxylic acid and 5–80 mol % of units derived from at least one aliphatic dicarboxylic acid, andd) the layer thickness dA is from 1.3 to 3.0 μm.The invention further relates to a process for producing the film and to its use.

The invention relates to the technical field of polylactic acid films, especially to a degradable biaxially-oriented polylactic acid cigarette film and a preparation method thereof. The invention overcomes the problems that an existing polypropylene cigarette film is non-degradable and an existing degradable polylactic acid film is difficult to be applied to cigarette films. According to a technical scheme, the degradable biaxially-oriented polylactic acid cigarette film is composed of a layer A, a layer B and a layer C which are co-extruded and stretched. The layer A comprises, by mass, 80%-90% of heat-seal I-type PLA, 8%-15% of a slipping agent and 2%-5% of an anti-blocking agent, wherein the heat-seal I-type PLA is composed of 70%-80% of crystalline PLA and 20%-30% of non-crystalline PLA. The layer B comprises 90-95% of crystalline PLA, 1-5% of an antistatic agent, 1-2% of a stiffening agent and 1-5% of a toughening agent. The layer C comprises 94-97% of heat-seal II-type PLA, 2-3%of a slipping agent and 1-3% of an anti-blocking agent, wherein the heat-seal II-type PLA is composed of 75-85% of crystalline PLA and 15-25% of non-crystalline PLA. The preparation method comprises the following steps: drying the above components according to the use amounts, carrying out melt extrusion, performing biaxially stretching, carrying out corona treatment, and then successively conducting rolling, aging, and slitting.

The invention discloses a method for preparing polyolefin micro-porous film. The method includes fusing and mixing a polyolefin resin and a film forming solvent in an extruder to prepare a polyolefin homogeneous melt; extruding the polyolefin homogeneous melt from a flat film die to form a molded melt, imposing various temperature fields on the surface of the molded melt for cooling, and imposing a shear force in the thickness direction during the cooling to form sheets; preheating the sheets, and performing longitudinal or bidirectional drawing on the sheets to form micro fibrillated film; extracting the film forming solvent in the micro fibrillated film with an extraction solvent, and drying the film forming solvent to form micro-porous film; preheating the micro-porous film, and subjecting the micro-porous film to secondary drawing and heat shaping. According to the method for preparing polyolefin micro-porous film, the pore diameter of the micro-porous film changes in the film thickness direction, and a compact structure layer and a coarse pore diameter structure layer are provided. The micro-porous film has the advantages of being rapid in electrolyte absorption, high in puncture strength, small in air permeability change and the like, and can meet the use requirements of lithium ion battery diaphragms.