Mitsubishi Plastics, Inc.

Takeyoshi Yamada

Yasushi Usami

Takashi Hiruma

Jun Takagi

Toru Terakawa

Hideyasu Miyazaki

You Miyashita

Kazuya Tanaka

Kouichirou Taniguchi

Takatoshi Muta

Yukihiro Tanaka

Kouichi Sawa

Miho Yamamoto

This polyolefin resin porous film can be easily produced, and when used as a non-aqueous electrolyte cell separator, can suppress clogging and can evince a high cell output. The polyolefin resin porous film is a porous film having a polyolefin resin as the primary component and is characterized by the average flow diameter pressure (P) being 1500-2500 kPa, the bubble point pressure (P) being 300-1500 kPa, and the ratio (Pa/P) of the air permeability (Pa) and the bubble point pressure (P) being no greater than 0.35 sec/(100 ml&#xb7;kPa).

Polyolefin resin porous film, and non-aqueous electrolyte cell separator using same

A heat-shrinkable film having a layer made of a mixed resin containing a polylactic acid resin and a polyolefin resin as the main components, wherein the mass ratio of the polylactic acid resin and the polyolefin resin is 95/5 to 50/50, the polylactic acid resin is a copolymer of D-lactic acid and L-lactic acid or a mixed resin of the copolymer, the D/L ratio of D-lactic acid and L-lactic acid is 3/97 to 15/85 or 85/15 to 97/3, the storage elastic modulus of the polyolefin resin or the soft acrylic resin at 20&#xb0; C. is &#x2266;100 MPa as measured at an oscillation frequency of 10 Hz and a strain of 0.1%, the film is stretched in at least one direction, and the heat shrinkage ratio of the film in the main shrinking direction is &#x2267;20% as measured after the film is immersed in 80&#xb0; C. water for 10 seconds.

Heat-shrinkable film, molded product and heat-shrinkable label employing the film, and container employing the molded product or having the label fitted thereon

The present invention relates to a heat-shrinkable laminate film comprising a surface layer composed mainly of polyester resin, an intermediate layer composed mainly of styrene resin, and an adhesive layer composed mainly of adhesive resin, wherein heat shrinkage in the main shrink direction is at least 10% and less than 30% when the film is dipped in water of 70&#xb0; C. for 10 seconds, and at least 30% and at most 70% when dipped in water of 80&#xb0; C. for 10 seconds, or its tensile modulus of elasticity in a direction perpendicular to the main shrink direction is at least 1,200 MPa. The heat-shrinkable film has excellent film elasticity, shrink finishing quality, transparency when incorporated as recycled, natural shrinkage, and suppressed delamination, making it suitable for application in shrink wrapping, shrink bundling wrapping, shrink label, and a plastic container provided with a heat shrinkable film made of such a film.

Heat-shrinkable laminate film, molded product and heat shrinkable label employing the film, and container

Provided is a porous polypropylene film having both air permeability properties and puncture strength. A porous polypropylene film which has an air permeability of 700 seconds/100 ml or less and a puncture strength of 1.5 N or greater, and has &#x3b2; activity can be obtained when the porous polypropylene film is made to have a tensile strength in the machine direction of the film, E, of 100 MPa or greater, a tensile strength in the transverse direction to the machine direction, E, of less than 100 MPa, and a ratio of Eand E, E/E, of 1.5 to 10.

Porous polypropylene film

A laminated porous film having at least two porous layers layered one upon another. One porous layer consists of a resin layer containing a polypropylene resin. The other layer is a heat-resistant layer consisting of a resin composition whose crystal fusion peak temperature is higher than that of the resin composition of the layer containing the polypropylene resin. The laminated porous film has a &#x3b2; activity and/or a &#x3b2; crystal generation power.

Laminated porous film and separator for battery

A heat-shrinkable film which is excellent in mechanical characteristics such as heat shrinkage characteristics, impact resistance, and transparency and in the finish of shrinkage and which is suitable for shrink packaging, shrink bundling, shrinkable labels, and so on. A film which is made from a mixed resin comprising as the main components either a polylactic acid resin (A) and a (meth)acrylic resin (B) or a polylactic acid resin (A) and a silicone/acrylic composite rubber (D) or has at least one layer made from the mixed resin and which exhibits a heat shrinkage percentage of 20% or above in the main shrinkage direction when dipped in water at 80&#xb0; C. for 10 seconds.

Heat-shrinkable film, moldings and heat-shrinkable labels made using the heat-shrinkable film, and containers made by using the moldings or fitted with the labels

A laminated porous film having a shutdown (SD) property and a high breakdown (BD) property combined includes at least two layers, which are a porous membrane layer (A layer) having a thickness of 10 &#x3bc;m or greater other than non-woven fabric and a non-woven fabric layer (B layer) having a fiber diameter of 1 &#x3bc;m or less. A value of the ratio (AP/AP) between air permeability when heating at a heating temperature of 150&#xb0; C. to 200&#xb0; C. for three minutes (AP) and air permeability prior to heating (AP) is 10 or greater at any heating temperature between 150&#xb0; C. and 200&#xb0; C.

Laminated porous film and separator for cell

Provided is a laminated porous film having excellent shutdown characteristics and breakdown characteristics, good tearing strength and dimensional stability, and B activity. The laminated porous film comprises layer A, the main component of which is a polypropylene resin, and layer B which contains a polyethylene resin, and the ratio of the rearing strength (H) in the machine direction (MD) of the laminated porous film and the tearing strength (H) in the transverse direction (TD) of the laminated porous film with respect to the machine direction (H) (H) is 0.08 to 2.0.

Laminated porous film, separator for lithium cell, and cell

The present invention provides a heat-shrinkable laminated film including at least two layers, in which the first layer is composed of at least one kind of a polylactic acid series resin as the main component and the second layer is composed of at least one kind of a polyolefin series resin as the main component. Heat shrinkage ratio of this film in the film main shrinking direction is 30% or more when dipped in warm water of 80&#xb0; C. for 10 seconds. Since this heat-shrinkable laminated film is made from a plant-derived resin, it promotes a use of biomass. Also, as this film exhibits excellent shrinkage property in low temperature, film rigidity, shrink finishing quality, and small natural shrinkage ratio, the film is suitably used for a molded product which requires heat shrinkage property, specifically, it is suitably used for shrinkable label.

Heat-shrinkable laminated film, molded product and heat-shrinkable label employing the film, and container

The present invention provides a polyolefin series heat-shrinkable film comprising a mixed resin mainly containing a polyolefin series resin (A), polylactic acid series resin (B), and a resin (C) facilitating compatibility with the resin (A) and the resin (B), or comprising at least one layer made of the mixed resin, wherein mass ratio of the resin (A) to the resin (B) is (A)/(B)=99/1 to 70/30; heat shrinkage ratio of the film at least in one direction when dipped in hot water at 80&#xb0; C. for 10 seconds is 20% or more; and natural shrinkage ratio of the film when stored at 40&#xb0; C. under 50% RH environment for 7 days is less than 10%. This polyolefin series heat-shrinkable film exhibits excellent heat-shrinkable property and shrink finishing quality, and inhibits natural shrinkage. This invention also provides a polyolefin series heat-shrinkable label and container on which the heat-shrinkable label is fitted.

Polyolefin series heat-shrinkable film, molded product and heat-shrinkable laminated label employing the film, and container

A heat-shrinkable polyolefin series laminated film having excellent firmness (stiffness at ordinary temperature) of film, resistance to fingerprint bleaching, shrink finishability, transparency and regeneration additivity, with a small natural shrinkage and accurately separable by specific gravity, can be provided by, in a laminated film provided with a surface layer (I) and an intermediate layer (III), forming the surface layer (I) with a mixed resin of cyclic olefin series resin and a polyethylene series resin (A) with a Tm of 80&#xb0; C. or higher but no greater than 125&#xb0; C. as a main component, and, forming the intermediate layer (III) with a resin composition having as a main component a cyclic olefin series resin, preferably a mixed resin composition of a cyclic olefin series resin and a polyethylene series resin (C) with a Tm exceeding 125&#xb0; C. but no greater than 140&#xb0; C., as a main component.

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Shiga, Japan

Takeyoshi Yamada