Abstract:
Provided in this invention is an impact absorber composition comprising a copolymer containing an aromatic vinyl compound, wherein the peak of tan δ of the copolymer obtained from the measurement of the dynamic viscoelasticity is in the range of more than 0° C. to 20° C. or less, the value of tan δ is 0.4 or more in the whole temperature range of 5° C. to 15° C., and the value of tan δ at 15° C. is 0.5 or more.
Abstract:
An object of the present invention is to inexpensively provide a method and device of producing a high viscosity polylactic acid composition, which composition is appropriate for foam molding having a high expansion ratio and is stable, and a foam molded article having a high expansion ratio formed of said high viscosity polylactic acid composition. A method of producing a polylactic acid foam molded article of the present invention which can achieve the above-described object is characterized by comprising a step of mechanically grinding a polylactic acid composition by applying a shear force, using a device equipped with an injection molding machine (B) or an extrusion molding machine (G), an orifice portion (S) and a foaming mold (P), in a foaming gas atmosphere in the orifice portion (S). The above-described polylactic acid composition is obtained by mechanically grinding polylactic acid, which polylactic acid is cross-linked by polyisocyanate, by applying a shear force in an inert gas atmosphere, said polylactic acid composition obtained by the grinding being characterized by having an MI value of 0.05 or more and 5 or less, which MI value is measured at 190° C. under a load of 21.6 kg in accordance with JIS K7210 (ISO 1133) (FIG. 2).
Abstract:
The present invention aims to provide a foamable resin composition which enables foam molding at high expansion ratios and reduction of open cells. The present invention also aims to provide a foam molded body produced from the foamable resin composition. The present invention is a foamable resin composition including a thermoplastic resin, thermal expansion microcapsules, and a chemical foaming agent, wherein Ts is not lower than 120° C., Tmax is not lower than 190° C., and Ts-Tc is not lower than −30° C. and not higher than 6° C., where Ts denotes a foaming starting temperature of the thermal expansion microcapsules, Tmax denotes a maximum foaming temperature of the thermal expansion microcapsules, and Tc denotes a decomposition temperature of the chemical foaming agent.
Abstract:
A resin composition is made of a mixture including a crosslinked polyethylene and a non-crosslinked polyethylene. The mixture has a density of 0.960 g/cm3 or more and a melt fracture tension within a range from 20 to 100 mN. A high-frequency co-axial cable includes sequentially: an internal conductor; an internal solid layer; a foamed insulation layer; an external solid layer; an external conductor; and an outer coat. The foamed insulation layer of includes a foam body of the above resin composition.
Abstract:
The present invention provides a thermally expandable microcapsule that maintains a high expansion ratio and hardly bursts and shrinks even at a high temperature, a foamable thermoplastic resin masterbatch and a foam molded product that are produced using the thermally expandable microcapsule, and a method for producing the thermally expandable microcapsule. The thermally expandable microcapsule comprises a volatile expansion agent included in a shell as a core agent and the shell formed of a polymer, the shell containing a thermosetting resin and a polymer obtainable by polymerization of a monomer composition containing a nitrile-type monomer and a monomer having a carboxyl group, and the thermosetting resin having no radical-polymerizable double bond and at least two functional groups reactive with a carboxyl group per molecule.
Abstract:
A resin composition for cross-linking foam molding having a polymer composition which comprises 100 parts by weight of the following component (A) and 0.5 to 20 parts by weight of the following component (B); a foaming agent; and a cross-linking agent, wherein the component (A) is an ethylene-based polymer satisfying the following conditions (a1) to (a2): (a1) the density is 860 to 935 kg/m3, and (a2) the melt flow rate (MFR) is 0.1 to 10 g/10 minutes, and the component (B) is an ethylene-α-olefin copolymer satisfying the following conditions (b1) to (b3): (b1) the density is 890 to 925 kg/m3, (b2) the intrinsic viscosity [η] determined in a tetralin solution is 4 to 15 dL/g, and (b3) the activation energy of flow (Ea) is less than 50 kJ/mol.
Abstract:
The present invention provides a closed-cell foamed rubber sheet whose sealability is less likely to decrease even after long-time use and which has excellent water resistance. The closed-cell foamed rubber sheet of the present invention comprises a rubber-based resin, and is provided by the steps of: providing a foamable resin composition containing the rubber-based resin and a foaming agent; irradiating the foamable resin composition with ionizing radiation to cross-link the foamable resin composition; and foaming the cross-linked foamable resin composition. In the case where the foamable resin composition further contains 0.5 parts by weight or more of a powdery additive other than the foaming agent per 100 parts by weight of the rubber-based resin, the rubber-based resin preferably contains a rubber-based resin ingredient which is in a liquid state at normal temperature.
Abstract:
Disclosed is a resin composition for crosslinking/foam molding which comprises a resin ingredient, a blowing agent, and a crosslinking agent, wherein the resin ingredient is an ethylene/α-olefin copolymer that comprises monomer units based on ethylene and monomer units based on an α-olefin having 3 to 20 carbon atoms and satisfies all of the following: (1) to have a density of 860-950 kg/m3, (2) to have a melt flow rate (MFR) of 0.01-10 g/10 min, (3) to have a ratio of weight-average molecular weight (Mw) to number-average molecular weight (Mn), Mw/Mn, of 5.5-30, (4) to have a ratio of Z-average molecular weight (Mz) to weight-average molecular weight (Mw), Mz/Mw, of 2-4, and (5) to have a melt tension (MT) of 8 cN or higher.
Abstract:
The present invention relates to organic polymer porous materials, and in particular, to an organic polymer porous material that functions as a reusable insoluble solid catalyst and a method for producing the same. The organic polymer porous material of the present invention is characteristic in that the amount of immobilized bases is high and the specific surface area is large. The object has been achieved by an organic polymer porous material including a polymer (PA) obtained by polymerizing a polymerizable composition (A) containing a compound (a) obtained by reacting a dendrimer (a1) having at least an amino group as a reactive functional group or a polyethyleneimine (a2) having at least an amino group as a reactive functional group with a compound (a3) having a vinyl group and a group that can react with the reactive functional group.
Abstract:
A post-crosslinked adsorbent comprises: monomer units of (a) at least 55 wt % at least one polyvinylaromatic monomer and (b) up to 45 wt % at least one monovinylaromatic monomer; and 0.5-2.5 mmol/g pendent vinyl groups; wherein the dry adsorbent has BET specific surface area in the range of about 650-1000 m2/g, BET average pore diameter 7.2-10 nm, BET porosity 1.29-2.45 mL/g, BJH adsorption micropore volume was less than 20% of total BJH adsorption pore volume, and HK micropore volume was less than 21% of total BJH adsorption pore volume. The invention is also directed to a preparation method for the polymeric adsorbent.