Laminated body
First Claim
Patent Images
1. A laminated body, comprising:
- a porous base material containing a polyolefin-based resin as a main component; and
a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin,the porous base material having a parameter X of not more than 20, the parameter X being calculated in accordance with a formula below, where MD tan δ
represents a tan δ
measured in a machine direction through a viscoelasticity measurement performed at a frequency of 10 Hz and a temperature of 90°
C., and TD tan δ
represents a tan δ
measured in a transverse direction through the viscoelasticity measurement,
X=100×
|MD tan δ
−
TD tan δ
|/{(MD tan δ
+TD tan δ
)/2}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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Abstract
To afford a laminated body that is usable as a nonaqueous electrolyte secondary battery separator and that is not easily curled, a laminated body includes: a porous base material containing a polyolefin-based resin as a main component; and a porous layer containing a polyvinylidene fluoride-based resin, the porous base material having a parameter X of not more than 20, the parameter X being calculated in accordance with a particular formula, 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.
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Citations
7 Claims
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1. A laminated body, comprising:
-
a porous base material containing a polyolefin-based resin as a main component; and a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin, the porous base material having a parameter X of not more than 20, the parameter X being calculated in accordance with a formula below, where MD tan δ
represents a tan δ
measured in a machine direction through a viscoelasticity measurement performed at a frequency of 10 Hz and a temperature of 90°
C., and TD tan δ
represents a tan δ
measured in a transverse direction through the viscoelasticity measurement,
X=100×
|MD tan δ
−
TD tan δ
|/{(MD tan δ
+TD tan δ
)/2}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)
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Specification