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.

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.