EP0064837A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Alkaline battery having a paper separator
Assignee: Wiggins Teape Group Ltd
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Filing: 1982-04-28
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Granted: —
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Expires: 2002-04-28
Abstract
Abstract A battery separator paper suitable for use in an alkaline battery comprises a web of polyolefinic synthetic pulp fibres and fibres effective to reinforce the polyolefinic fibres. The polyolefinic synthetic pulp fibres are not substantially heat-bonded to each other or to the reinforcing fibres but are bonded to each other and the reinforcing fibres by means of an alkali-resistant hydrophilic binder, e.g. polyvinyl alcohol. The reinforcing fibres may for example be polyvinyl alcohol, rayon, PVC or nylon. The battery separator paper is made by conventional papermaking techniques.
Inventors
- 👤 Quentin Miles Drew
- 👤 Roger Philip Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:48
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/44; H01M50/411; H01M50/414; H01M50/417; H01M50/489; H01M50/491; H01M50/494; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A battery separator paper for use in an alkaline battery, comprising a blend of polyolefinic synthetic pulp fibres and alkali-resistant fibres which are effective to reinforce the polyolefinic fibres, characterised in that the synthetic pulp fibres are not substantially heat-bonded to each other or to the reinforcing fibres but are bonded to each other and the reinforcing fibres by means of an alkali-resistant hydrophilic binder which is present in an amount additional to any such binder which may have been present in said synthetic pulp fibres or the reinforcing fibres.
Claim 2
Dependent Claim
90 words
A battery separator paper for use in an alkaline battery, comprising a blend of polyolefinic synthetic pulp fibres and alkali-resistant fibres which are effective to reinforce the polyolefinic fibres, characterised in that the synthetic pulp fibres are not substantially heat-bonded to each other or to the reinforcing fibres but are bonded to each other and the reinforcing fibres by means of an alkali-resistant hydrophilic binder which is present in an amount additional to any such binder which may have been present in said synthetic pulp fibres or the reinforcing fibres.
Claim 3
Dependent Claim
38 words
A battery separator paper as claimed in claim 1 characterised in that the polyolefinic synthetic pulp is present in an amount of from about 30% to about 85% by weight of the total fibre content of the paper.
Claim 4
Dependent Claim
33 words
A battery separator paper as claimed in claim 1 or 2 characterised in that the alkali-resistant fibres which are effective to reinforce the polyolefinic fibres are of polyvinyl alcohol, rayon, PVC or nylon.
Claim 5
Dependent Claim
20 words
A battery separator paper as claimed in any preceding claim characterised in that the alkali-resistant hydrophilic binder is polyvinyl alcohol.
Claim 6
Dependent Claim
27 words
A battery separator paper as claimed in any preceding claim characterised in that the alkali-resistant hydrophilic binder is present in an additional amount of at least 2%.
Claim 7
Dependent Claim
32 words
A battery separator paper as claimed in any preceding claim characterised in that the total grammage of the separator is in the range from 60 gm- 2 to 100 gm -2 .
Claim 8
Dependent Claim
33 words
A battery separator paper as claimed in any preceding claim characterised in that the density of the separator is in the range from 0.170 gcm -3 to 0 . 335 gcm -3 .
Claim 9
Dependent Claim
117 words
A process for forming a battery separator paper for use in an alkaline battery, comprising the steps of forming a wet-laid paper web from a blend of polyolefinic synthetic pulp fibres and alkali-resistant fibres which are effective to reinforce the polyolefinic fibres, and drying the web thus formed, characterised in that in applying heat to dry or otherwise treat the web, the conditions are such that the synthetic pulp fibres do not. become substantially heat-bonded to each other or to the reinforcing fibres and in that an alkali-resistant hydrophilic binder is incorporated in the web in an amount additional to any such binder which may already be present in said synthetic pulp fibres or the reinforcing fibres.
Claim 10
Dependent Claim
117 words
A process for forming a battery separator paper for use in an alkaline battery, comprising the steps of forming a wet-laid paper web from a blend of polyolefinic synthetic pulp fibres and alkali-resistant fibres which are effective to reinforce the polyolefinic fibres, and drying the web thus formed, characterised in that in applying heat to dry or otherwise treat the web, the conditions are such that the synthetic pulp fibres do not. become substantially heat-bonded to each other or to the reinforcing fibres and in that an alkali-resistant hydrophilic binder is incorporated in the web in an amount additional to any such binder which may already be present in said synthetic pulp fibres or the reinforcing fibres.
Claim 11
Dependent Claim
23 words
A process as claimed in claim 8 characterised in that the binder is applied to the web by means of size press treatment.
Claim 12
Dependent Claim
38 words
A process as claimed in claim 8 or 9 characterised in that the polyolefinic synthetic pulp is present in an amount of from about 30 to about 85% by weight of the total fibre content of the paper.
Claim 13
Dependent Claim
33 words
A process as claimed in any of claims 8 to 10 characterised in that the alkali-resistant fibres which are effective to reinforce the polyolefinic fibres are of polyvinyl alcohol, rayon, PVC or nylon.
Claim 14
Dependent Claim
22 words
A process as claimed in any of claims 8 to 11 characterised in that the alkali-resistant hydrophilic binder added is polyvinyl alcohol.
Claim 15
Dependent Claim
27 words
A process as claimed in any of claims 8 to 12 characterised in that the alkali-resistant hydrophilic binder is added in an amount of at least 2%.
Claim 16
Dependent Claim
24 words
A battery separator for use in an alkaline battery formed from a battery separator paper as claimed in any of claims 1 to 7.
Claim 17
Dependent Claim
11 words
l5.An alkaline battery having a separator as claimed in claim 14.
References Cited (Backward Citations)
US3918994A
Cited
GB1530961A
Cited
FR2342155A1
Cited
US4078123A
Cited
GB2020086A
Cited
GB2034365A
Cited
GB2057028A
Cited
GB2078769A
Cited
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