Abstract: Disclosed is a method and apparatus that contacts polymers with supercritical fluids in a density fluctuation ridge, producing selectively porous low-density regions impermeable to large molecule gases, for use in gas masks and respiratory processes.

Abstract: A release sheet comprising a release substrate and a release layer which comprises cross-linked polyolefin, is formed at least one side of said release substrate, and has from 10 to 300 mN/cm of release force to an adhesive layer formed from a 2 packs type acryl-based adhesive agent. The said release sheet has an excellent heat resistance, solvent resistance, adhesion between a release layer and a release substrate and capability of direct transfer coating of an adhesive layer on a release layer.

Abstract: A release agent for forming a release layer contacting with an adhesive layer, comprising (A) a polyolefin having a weight-average molecular weight of not less than 1×104, which may contain a functional group, and (B) a hydrocarbon having a viscosity of 1 to 1×104 cP as measured at 23° C. according to JIS K-7117, a weight ratio of the polyolefin (A) to the hydrocarbon (B) being 97:3 to 60:40. Such a release agent provides a novel release agent that is usable as an alternative material of a silicone-based and fluororesin-based release agents.

Abstract: A release agent comprising (A) an olefin-based elastomer having a density of not less than 0.855 g/cc and less than 0.868 g/cc, and (B) an ethylene-?-olefin copolymer having a density of from 0.868 g/cc to 0.970 g/cc as main components, wherein the difference in average density between the components (A) and (B) is not less than 0.005 g/cc and the mixing weight ratio of the component (A) to the component (B) is from 90:10 to 10:90. Such a release agent contains no silicone-based components generating undesired gasses, can exhibit not only a good releasability to various adhesives but also a less fluctuation in peeling force, and can maintain a low peeling force even when the release agent is bonded to an adhesive and preserved under a heating condition.

Abstract: An ethylene/&agr;-olefin copolymer having a density of 0.900 to 0.965 g/cm3; having an MI of 0.01 to 100 g/10 minutes; in a chromatogram with the use of Rayleigh ratio obtained by extrapolating GPC-MALLS data at a scattering angle of 0°, showing an average {overscore (Mc)} obtained by measuring five times of 0.5% or more and a standard deviation <&sgr;> from the average of 35% or less, wherein Mc stands for the chromatographic area ratio of the components having molecular weight of 1,000,000 or more calculated on the basis of the above measurement; and having a W30 (weight fraction of the portion eluted below 30° C.) in CFC measurement of 1 (% by weight) or less; and a film thereof.

Abstract: There is provided a propylene resin composition having an Izod impact strength (23.degree. C., notched) of not less than 5 kJ/m.sup.2 and a flexural modulus of not less than 500 MPa, wherein as measured by electron spectroscopy for chemical analysis, the ratio of the valence electron spectral intensity at a bond energy of 16.5 eV to the valence electron spectral intensity at a bond energy of 13.5 eV, I 16.5/I 13.5, is in the range of 1.6 to 2.0.There is also provided a method for evaluating a propylene resin composition, which comprises subjecting a propylene resin composition to electron spectroscopy for chemical analysis to measure the ratio of the valence electron spectral intensity at a bond energy of 16.5 eV to the valence electron spectral intensity at a bond energy of 13.5 eV, I 16.5/I 13.5; and evaluating, based on the ratio, the amount of a rubber component present on the surface of the composition.

Abstract: A propylene resin composition containing talc, comprising the following components (a), (b) and (c) is provided: (a) 100 parts by weight of a propylene/ethylene block copolymer containing a crystalline propylene homopolymer part (Unit A part) and an ethylene/propylene random copolymer part (Unit B part); (b) 0.1 to 80 parts by weight of talc having an average particle size of 1.5 to 20 microns and an average aspect ratio of not less than 4; and (c) 2 to 80 parts by weight of an ethylene/.alpha.-olefin copolymer polymerized by using a metallocene catalyst, and containing an .alpha.-olefin having 3 to 16 carbon atoms. This composition has good paintability, molding processability (fluidity) and excellent mechanical strength balance, and is useful for a material for e.g., automobile parts.

Abstract: The invention relates to an adhesive resin composition comprising an ethylene polymer having a melting point of 70 to 132.degree. C., a density of 0.88 to 0.94% g/cm.sup.3 and a melt flow rate (MFR) of 0.05 to 50 g/10 min. and/or a modified product thereof with an unsaturated carboxylic acid or its derivative (component A); a tackifier (component B); and a block copolymer containing at least one polymer block mainly composed of a vinyl aromatic hydrocarbon and at least one polymer block mainly composed of a conjugated diene or a hydrogenated product thereof (component C). This composition is useful as an adhesives showing excellent adhesion over a wide temperature range as well as processability by film molding, sheet molding, blow molding, etc. It is available for laminates comprising various kinds of resins such as polyolefins, styrenic resins, polyesters, acrylic resins and polyamides.