摘要:
A propylene-based polymer composition obtained by polymerizing a propylene monomer in the presence of a stereoregular olefin polymerization catalyst system in the first stage to produce a crystalline propylene-based polymer(A) having an intrinsic viscosity of 5 dl/g or more, and successively polymerizing a propylene monomer in the second stage to produce a crystalline propylene-based polymer(B) with an intrinsic viscosity of less than 3 dl/g, wherein the content of the (A) is in the range of 0.05% by weight or more and less than 35% by weight in the total of the polymers(A) and (B), and the total of the polymers(A) and (B) has an intrinsic viscosity of less than 3 dl/g and a Mw/Mn of less than 10, and the foamed article thereof.
摘要:
A foamed thermoplastic resin sheet manufacturing device is provided with (i) an extruder for melting and kneading a thermoplastic resin and a foaming agent to form a melted/kneaded mixture and extruding the melted/kneaded mixture, (ii) a die which is provided at a front end of said extruder and forms the melted/kneaded mixture into a sheet-like foamy thermoplastic resin material, (iii) a vacuum chamber in which the foamy thermoplastic resin material extruded through said die expands under a reduced pressure, and (iv) a facing-wall section composed of a pair of walls of said vacuum chamber which face each other in a thickness direction of the foamy thermoplastic resin material, at least one of the walls in pair being a movable wall provided so as to move in directions in which said walls approach and separate each other. By this arrangement, foamed thermoplastic resin sheets with various thicknesses can be produced.
摘要:
There is provided a propylene based resin composition comprising: (i) about 70 to 90% by weight of a propylene block copolymer; and (ii) about 30 to 10% by weight of an ethylene based resin, wherein: (a) the relation between its die swelling ratio (SR1) at a shear rate of 6.08 sec−1 and its die swelling ratio (SR2) at a shear rate of 608 sec−1 satisfies the following formula (1); and (b) the relation among its Izod impact value (kJ/m2) at a temperature of 0° C., its flexural modulus (MPa) at a temperature of 23° C. and its haze value (%) satisfies the following formula (2) SR2/SR1≦about 1.10 (1) Izod impact value×Flexural modulus/Haze value≧about 200 (2).
摘要翻译:提供一种丙烯基树脂组合物,其包含:(i)约70至90重量%的丙烯嵌段共聚物; 和(ii)约30〜10重量%的乙烯类树脂,其中:(a)剪切速率为6.08秒-1时的模头溶胀比(SR1)与其模头溶胀比(SR2)之间的关系 608秒-1的剪切速度满足下式(1); 和(b)温度为0℃下的Izod冲击值(kJ / m 2),23℃温度下的弯曲弹性模量(MPa)与其雾度值(%)之间的关系满足下式 (2)
摘要:
The present invention provides a process for producing uncrosslinked polypropylene-based resin foam sheets which is characterized by using an extrusion foaming apparatus having a gear pump which is interposed between the extruder and the die and which is linked by means of adapters, wherein the pressure (Pg) at the inlet of the gear pump is within the range specified by the following formula (Formula 1) and the extruder is controlled so that the value of Pg is constant. Formula 1 Pc≦Pg(atm)≦Pc+90 Pc=(&khgr;−1)/H &khgr;: theoretical expansion ratio when the foaming agent added is 100% held H: coefficient of solubility of the foaming gas in the resin at the resin temperature in the gear pump inlet (cm3(STP)/cm3·atm) and the like. The present invention makes it possible to produce uncrosslinked polypropylene-based resin foam sheets having fine foam cells and good appearance and being excellent in productivity and extrusion stability as well as in productivity improving effect in the production of high-expansion thin sheets with reducing wavy or corrugated defects at ends of sheets.
摘要:
The present invention relates to a polymer composition comprising 100 parts by weight of an olefin-based polymer, and 0.01 to 100 parts by weight of a branched fatty acid and 0.01 to 200 parts by weight of a releasable active compound per 100 parts by weight of said olefin-based polymer.
摘要:
A resin composition wherein the content of the following component (i) is 99 to 30 wt % and the content of the following component (ii) is 1 to 70 wt %, a pressurized foaming molded body of the resin composition, and a laminate obtained by laminating a layer composed of the pressure-foamed molding and a layer composed of another material: (i) an ethylene-a-olefin-based copolymer comprising an ethylene monomer unit and an a-olefin monomer unit having 3 to 20 carbon atoms wherein the melt flow rate is 0.01 to 5 g/10 minutes and the activation energy for flow is 30 kJ/mol or more, (ii) an ethylene-unsaturated ester-based copolymer comprising an unsaturated ester monomer unit and an ethylene monomer unit.
摘要:
An indicator comprising a porous resin material, and a liquid retained in the pores of the porous resin material, in which the whiteness of the porous resin material is at least 80, and the whiteness of the porous resin material is at least 20 larger than that of the indicator. This indicator displays information such as a period through the change of a color tone, and the like, well maintains the displaying properties, and suffers from less variation of displayed periods.
摘要:
There is provided a laminated sheet comprising: (i) a foamed sheet containing a polypropylene resin; and (ii) a non-woven fabric, wherein the foamed sheet has an expansion ratio, &khgr;, of from about 2 to 10, a cell diameter of not more than about 300 &mgr;m, and a thickness, h (cm), satisfying the following formula (1), (100/E(1−(1−1/&khgr;)⅔))⅓≦h≦2 (1) wherein E (kgf/cm2) is a modulus of elasticity in bending of the resin which is to be a constituent of the foamed sheet and is not yet foamed.
摘要:
The present invention relates to a polymer composition comprising 100 parts by weight of an olefin-based polymer, and 0.01 to 100 parts by weight of a branched fatty acid and 0.01 to 200 parts by weight of a releasable active compound per 100 parts by weight of said olefin-based polymer.
摘要:
A resin composition for pressure-foam molding, which comprises an ethylene-based copolymer and a foaming agent, wherein the ethylene-based copolymer has monomer units derived from ethylene and monomer units derived from an a-olefin having 3 to 20 carbon atoms, has a melt flow rate of 0.01 to 0.7 g/10 minutes, a molecular weight distribution of 5 or more determined by a gel permeation chromatography, an activation energy of flow of 40 kJ/mol or more, and inflection points of 3 or less on a melting curve within temperature range from 25° C. to the end point of melting obtained by a differential scanning calorimetry; a foam obtained by press foaming; and a process for producing the foam.