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1. CA2615495 - MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE AND BATTERY SEPARATOR

Office Canada
Application Number 2615495
Application Date 14.07.2006
Publication Number 2615495
Publication Date 25.01.2007
Grant Number
Grant Date 25.02.2014
Publication Kind C
IPC
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27
Layered products essentially comprising synthetic resin
32
comprising polyolefins
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
M
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
2
Constructional details, or processes of manufacture, of the non-active parts
14
Separators; Membranes; Diaphragms; Spacing elements
16
characterised by the material
B32B 27/32
H01M 2/16
CPC
H01M 10/4235
B01D 67/0027
B01D 69/02
B01D 69/12
B01D 71/26
B01D 2325/22
Applicants TONEN CHEMICAL CORPORATION
Priority Data 2005-207752 15.07.2005 JP
Title
(EN) MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE AND BATTERY SEPARATOR
(FR) MEMBRANE MICROPOREUSE MULTICOUCHE CONSTITUEE DE POLYOLEFINES ET SEPARATEUR POUR BATTERIE
Abstract
(EN)


A multi-layer, microporous polyolefin membrane having at least
three layers, which comprises first microporous layers made of a polyethylene
resin for constituting at least both surface layers, and at least one second
microporous layer comprising a polyethylene resin and polypropylene and
disposed between both surface layers, the heat of fusion (.increment.H m) of
the
polypropylene measured by differential scanning calorimetry being 90 J/g or
more, and the polypropylene content in the second microporous layer being 50%
or less by mass based on 100% by mass of the total of the polyethylene resin
and
the polypropylene.

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