105 results about "Thermomechanical analysis" patented technology

A battery separator which is a laminated polyolefin microporous membrane, comprising a polyolefin microporous membrane, and a modifying porous layer comprising a water-soluble resin or water-dispersible resin, and fine particles, the modifying porous layer being laminated on at least one surface of the polyolefin microporous membrane, wherein the polyolefin microporous membrane comprises a polyethylene resin and has (a) a shutdown temperature (a temperature at which an air resistance measured while heating the polyolefin microporous membrane at a temperature rise rate of 5°C / min reaches 1 × 10 5 sec / 100 cc) of 135°C or lower, (b) a rate of air resistance change (a gradient of a curve representing dependency of the air resistance on temperature at an air resistance of 1 × 10 4 sec / 100 cc) of 1 × 10 4 sec / 100 cc / °C or more, (c) a transverse shrinkage rate at 130°C (measured by thermomechanical analysis under a load of 2 gf at a temperature rise rate of 5°C / min) of 20% or less, and a thickness of 16 µm or less, the shutdown temperature difference between the polyolefin microporous membrane and the laminated polyolefin microporous membrane being 4.0°C or less. A method of producing the same. Provided is a battery separator with excellent adhesion and shutdown properties comprising a modifying porous layer and a polyolefin microporous membrane.

This invention provides a multilayered wiring board (1) comprising a rigid part (2) and a flexible part (3). The rigid part (2) comprises a first base material (4) and a second base material (5A). The first base material (4) comprises a first insulating layer (41) and a first conductor layer (42) and is flexible. The second base material (5A) comprises a second insulating layer (51) and a second conductor layer (52) bonded to at least one side of the first base material (4) and has a higher rigidity than the first base material (4). The flexible part (3) is extended continuously from the rigid part (2) and is formed of the first base material (4). The second insulating layer (51) has a coefficient of thermal expansion of not more than 13 ppm / DEG C as measured in a facial direction by a thermomechanical analysis in a predetermined temperature range and a coefficient of thermal expansion of not more than 20 ppm / DEG C in the thickness-wise direction as measured by a thermomechanical analysis according to JIS C 6481 in a predetermined temperature range.

Provided is a highly functional polyethylene fiber which is small in changes of physical properties and has excellent dimensional stability over a wide range of product processing temperature and a wide range of product's service temperature. Also provided is a highly functional polyethylene fiber which is capable of achieving a high dye exhaustion ratio by a simple dyeing operation and has excellent color fastness. The highly functional polyethylene fibers of the present invention are characterized by having a limiting viscosity [n] of 0.8 dL / g to 4.9 dL / g (inclusive), a repeating unit that is substantially composed of ethylene, a maximum contraction stress as determined by TMA (thermomechanical analysis) of 0.4 cN / dtex or less and a thermal shrinkage at 100 DEG C of 2.5% or less.

Provided is a porous multi-layer film having two or more layers that is used as a separator for battery. In the film, more than 2 layers have different porosities and pore sizes. The film has a thickness of 9 to 50 μm, a machine direction (MD) loop stiffness of 0.008 mg / μm or more, puncture strength of 0.15 N / μm or more, permeability of 1.5×10−5 Darcy or more, shut-down temperature of 140° C. or less, melt-down temperature of 170° C. or more, a transverse direction (TD) maximum shrinkage of 25% or less in Thermomechanical Analysis (TMA) under a load of 1 mN / (1 μm×6 mm), and melt down temperature of 160° C. or more. Since the porous multi-layer film shows excellent thermal stability at high temperature and electrolyte retaining property due to a dual pore structure, the film shows a superior effect when used as a separator for high-capacity / high-power lithium ion battery.