LAMINATED BODY
First Claim
1. A laminated body, comprising:
- a porous base material containing a polyolefin-based resin as a main component; and
a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin,the porous base material having a piercing strength of not less than 26.0 gf/g/m2, which piercing strength is measured with respect to a weight per unit area of the porous base material,the porous base material having a value in a range of 0.00 to 0.54, which value is represented by the following Expression (1);
|1−
T/M|
(1)where (i) T represents a distance by which the porous base material moves in a traverse direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N and (ii) M represents a distance by which the porous base material moves in a machine direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N,the polyvinylidene fluoride-based resin containing crystal form α
in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and
crystal form β
contained in the polyvinylidene fluoride-based resin,where the amount of the crystal form α
is calculated from an absorption intensity at around 765 cm−
1 in an IR spectrum of the porous layer, and an amount of the crystal form β
is calculated from an absorption intensity at around 840 cm−
1 in the IR spectrum of the porous layer.
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Accused Products
Abstract
A nonaqueous electrolyte secondary battery separator having a laminated body which is not easily curled is provided. The laminated body includes a porous base material containing a polyolefin-based resin as a main component and a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin. The porous base material has a piercing strength of not less than 26.0 gf/g/m2. The polyvinylidene fluoride-based resin contains crystal form α in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and crystal form β contained in the polyvinylidene fluoride-based resin.
18 Citations
7 Claims
-
1. A laminated body, comprising:
-
a porous base material containing a polyolefin-based resin as a main component; and a porous layer which is disposed on at least one surface of the porous base material and which contains a polyvinylidene fluoride-based resin, the porous base material having a piercing strength of not less than 26.0 gf/g/m2, which piercing strength is measured with respect to a weight per unit area of the porous base material, the porous base material having a value in a range of 0.00 to 0.54, which value is represented by the following Expression (1);
|1−
T/M|
(1)where (i) T represents a distance by which the porous base material moves in a traverse direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N and (ii) M represents a distance by which the porous base material moves in a machine direction from a starting point of measurement to a point where a critical load is obtained in a scratch test under a constant load of 0.1 N, the polyvinylidene fluoride-based resin containing crystal form α
in an amount of not less than 36 mol % with respect to 100 mol % of a total amount of the crystal form α and
crystal form β
contained in the polyvinylidene fluoride-based resin,where the amount of the crystal form α
is calculated from an absorption intensity at around 765 cm−
1 in an IR spectrum of the porous layer, and an amount of the crystal form β
is calculated from an absorption intensity at around 840 cm−
1 in the IR spectrum of the porous layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification