Back to results
US 8,011,518 B2Granted
Crystalline polymer microporous film, manufacturing method of the same, and filtration filter
AssigneeFUJIFILM Corporation
InventorsHirohisa Hokazono, Toshiki Taguchi, Hidetaka Okada
Life of this patent
Estimating the term…
Abstract
To provide a crystalline polymer microporous film including: a laminate consisting of two or more crystalline polymer layers formed of crystalline polymers; and multiple pores penetrating through the laminate in the thickness direction thereof, wherein an average pore size of each of the crystalline polymer layer changes along the thickness thereof.
Claims13
A crystalline polymer microporous film comprising:
- a laminate consisting of two or more crystalline polymer layers formed of crystalline polymers;
- and
- multiple pores penetrating though the laminate in the thickness direction thereof,
- wherein the average pore size of each of the crystalline polymer layers continuously changes along the thickness thereof,
- wherein the average pore size at a boundary between adjacent crystalline polymer layers changes in stages, and
- wherein the average pore size changes in the thickness direction in a manner of continuously increasing or continuously decreasing.
3 more elements
A manufacturing method of a crystalline polymer microporous film comprising:
- laminating two or more crystalline polymer layers to form a laminate, the crystalline polymer layers formed of different crystalline polymers;
- heating one surface of the laminate at a temperature from the melting point of the laminate to the melting point plus 15° C. to establish a temperature gradient in the thickness direction thereof;
- and
- stretching the laminate in which the temperature gradient has been established.
1 more element
A filtration film comprising:
- a crystalline polymer microporous film which comprises a laminate consisting of two or more crystalline polymer layers formed of crystalline polymers, and multiple pores penetrating through the laminate in the thickness direction thereof,
- wherein the average pore size of each of the crystalline polymer layers continuously changes along the thickness thereof,
- wherein the average pore size at a boundary between adjacent crystalline polymer layers changes in stages, and
- wherein the average pore size changes in the thickness direction in a manner of continuously increasing or continuously decreasing.
1 more element
Dependencies are inferred from the claim text.