Abstract:
Provided are pre-expanded polypropylene resin particles having a dimensional expansion coefficient of 1.5% or more determined with a thermomechanical analyzer at a constant compressive load of 1 mg during heating from 30° C. to 100° C. at a temperature increase rate of 10° C./min. Using the pre-expanded polypropylene resin particles can yield an in-mold foam molded product of polypropylene resin having few wrinkles and small dimensional shrinkage without pretreatment such as internal pressure application or compression packing during packing the pre-expanded particles in a mold for in-mold foam molding.
Abstract translation:本发明提供一种预发泡聚丙烯树脂颗粒,其在30℃至100℃的温度下以10℃的恒定压缩载荷下,用热机械分析仪测定的尺寸膨胀系数为1.5%以上。 °C / min。 使用预发泡的聚丙烯树脂颗粒可以产生具有很少皱纹和小尺寸收缩的聚丙烯树脂的模内发泡模制产品,而不需要预处理,例如在将预发泡颗粒包装在模具中的内部压力施加或压缩填料, 模具发泡成型。
Abstract:
Decorative foamed articles are prepared from foamed pellets, beads, particles, or other articles of a thermoplastic elastomer infused with a supercritical fluid in a pressurized container, then rapidly depressurized and heated either by immersion in a heated fluid that can rapidly heat the article or with infrared or microwave radiation to heat and foam the pellets, beads, particles, or other articles that are then molded into the articles. The pellets are dyed with a nonionic or anionic dye one of: (1) before being infused with the supercritical fluid, (2) during being infused with the supercritical fluid by a nonionic or anionic dye dissolved or dispersed in the supercritical fluid, which optionally comprises a polar liquid, (3) during immersion in the heated fluid, where the heated fluid contains the dye, or (4) after being foamed.
Abstract:
Polypropylene resin foamed particles containing a polypropylene random copolymer having a ratio of a Z-average molecular weight Mz to a number average molecular weight Mn, Mz/Mn, of 20 or more and 300 or less, a melt-flow rate of 5 g/10 minutes or more and 20 g/10 minutes or less, a melt strength of 2.5 cN or less, and a flexural modulus of 600 MPa or more and 1600 MPa or less, and preferably having at least two heat quantity areas of fusion can provide an in-mold foam molded article such as a returnable box having a short molding cycle at in-mold foam molding and beautiful surface properties; and are excellent in moldability even if an inner pressure more than the atmospheric pressure is not provided to the particles or the particles are filled in a mold without compressing them with a gas during the in-mold foam molding.
Abstract:
Carbon black-containing composite resin pre-expanded particles comprising 100 to 400 parts by mass of a polystyrene-based resin with respect to 100 parts by mass of a carbon black-containing polyolefin-based resin; having a carbon black content of 0.5 to 5.0% by mass and a bulk density of 0.015 to 0.25 g/cm3; and having an outermost layer of 30 to 80 pm after undergoing the following tests: (a) one of the carbon black-containing composite resin pre-expanded particles is sliced into a 1-mm slice in such a way that cross-section surfaces of cells are exposed on both surfaces of the slice; (b) the obtained slice is immersed in toluene at 25° C. for 24 hours to extract a polystyrene-based resin component as described above; (c) the cross-section surface of the slice is then subjected to magnified photographing by a microscope; (d) the obtained microscope image is observed.
Abstract:
Provided are (i) polyethylene resin foamed particles which are obtained by foaming polyethylene resin particles to be foamed having good productivity and a high expansion ratio and which are suppressed in reduction of cell diameters, and (ii) a polyethylene resin in-mold foam molded article obtained from the polyethylene resin foamed particles which has good surface smoothness while being reduced in surface yellowing. The polyethylene resin foamed particles (i) contain, as a base resin, a polyethylene resin composition containing, in an amount of not less than 1000 ppm to not more than 4000 ppm in total, one or more compounds selected from the group consisting of antioxidants, metal stearates, and inorganic substances and (ii) have Z-average molecular weight of not less than 40×104 to not more than 70×104, an average cell diameter of not less than 180 μm to not more than 450 μm, and an open-cell ratio of not more than 12%.
Abstract:
In order to obtain a flame-retardant polyolefin resin expanding molded product which has excellent in-mold moldability and excellent surface appearance and satisfies the FMVSS flammability even if carbon black is added, polyolefin resin particles containing, with respect to 100 parts by weight of polyolefin resin, (i) 0.03 part by weight to 5 parts by weight of phosphorous flame retardant having a phosphorous content of 7% by weight or more, a melting point of 120° C. or more, and a 5% by weight decomposition temperature within a range of 240° C. to 320° C. and (ii) 0.5 part by weight to 20 parts by weight of carbon black are expanded.
Abstract:
A method for producing expanded particles, the method comprising dividing at least two or more times expandable particles including a base resin, which is a composite resin of a polyolefin-based resin and a polystyrene-based resin, and a blowing agent and subjecting each to an expansion step, wherein the expandable particles are subjected to the expansion step directly after being held in a pressurized vessel maintained at 0.1 to 0.4 MPa and −20 to 30° C.
Abstract:
A noncrosslinked polyethylene resin expanded particle is provided having a bulk density BD in a range of 10 g/L to 100 g/L, the particle being obtained by expanding a polyethylene resin particle whose density is in a range of 0.920 g/cm3 to 0.940 g/cm3, the noncrosslinked polyethylene resin expanded particle having a shrinkage factor in a range of 2% to 30%, the shrinkage factor being obtained by the following formula (1): Shrinkage Factor =(BD−VBD)×100/VBD (1), wherein: the BD of the noncrosslinked polyethylene expanded particle is a bulk density at 23° C. and at 0.1 MPa (at a normal atmospheric pressure); and the VBD of the noncrosslinked polyethylene expanded particle is a bulk density at 23° C. and at a reduced pressure of 0.002 MPa or less.
Abstract translation:提供了一种非交联聚乙烯树脂发泡粒子,其堆积密度BD在10g / L至100g / L的范围内,该颗粒通过使密度在0.920g / cm 3至0.940的范围内的聚乙烯树脂颗粒膨胀而获得 g / cm3,收缩率在2%〜30%的收缩率的非交联聚乙烯树脂发泡体,收缩率由下式(1)求出:收缩系数=(BD-VBD)×100 / VBD( 1),其中:非交联聚乙烯发泡粒子的BD为23℃,0.1MPa(正常大气压)时的体积密度; 非交联聚乙烯发泡粒子的VBD为23℃,0.002MPa以下的减压下的体积密度。
Abstract:
An electrostatic dissipating molded article having a surface resistivity of 1×105 to 1×1010Ω and obtained by in-mold molding of multi-layered polyolefin-based resin expanded beads each having an polyolefin-based resin expanded core layer and a polyolefin-based resin cover layer which covers the polyolefin-based resin expanded core layer and which is formed from a polyolefin-based resin (A), a polymeric antistatic agent (B) of a block copolymer of a polyether block and a polyolefin block, and an electrically conductive carbon black (C), the components (A) to (C) being present in a specific proportion.
Abstract:
Expanded composite polystyrene-based resin particles having a plurality of cells and cell membranes separating the plurality of cells, said cell membranes including a polystyrene-based resin forming a continuous phase and polyacrylic acid alkyl ester-based resin fine particles dispersed in said continuous phase to form a dispersed phase, and said polystyrene-based resin being complexed with said polyacrylic acid alkyl ester-based resin fine particles, wherein said dispersed phase is present in the form of a plurality of layers in a cell membrane thickness direction in a cell membrane cross-section of said expanded composite polystyrene-based resin particles.