EP0160497A2
Expired / Lapsed
EP
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High-performance electret and air filter
Assignee: Mitsui Chemicals Inc
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Filing: 1985-04-23
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Granted: —
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Expires: 2005-04-23
Abstract
Abstract Disclosed is a high-performance electret comprising 60 to 99% by weight of a non-polar polymer, 0.5 to 39.5% by weight of a polar polymer and 0.5 to 20% by weight of at least one component selected from the group consisting of (A) a non-polar polymer modified with an unsaturated carboxylic acid or a derivative thereof, (B) a non-polar polymer modified with an unsaturated epoxy monomer and (C) a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond. In this electret, a high charge density can be maintained stably over a long period, and this electret can be easily formed into a film. An air filter prepared from this electret is very excellent in the dust collecting efficiency.
Inventors
- 👤 Naofumi Inoue
- 👤 Satoshi Matsuura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 23:14
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/28; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A high-performance electret comprising 60 to 99% by weight of a non-polar polymer, 0.5 to 39.5% by weight of a polar polymer and 0.5 to 20% by weight of at least one modified polymer selected from (A) a non-polar polymer modified with an unsaturated carboxylic acid or a derivative thereof, (B) a non-polar polymer modified with an unsaturated epoxy monomer and (C) a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond.
Claim 2
Dependent Claim
75 words
A high-performance electret comprising 60 to 99% by weight of a non-polar polymer, 0.5 to 39.5% by weight of a polar polymer and 0.5 to 20% by weight of at least one modified polymer selected from (A) a non-polar polymer modified with an unsaturated carboxylic acid or a derivative thereof, (B) a non-polar polymer modified with an unsaturated epoxy monomer and (C) a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond.
Claim 3
Dependent Claim
16 words
A high-performance electret according to claim 1, wherein the non-polar polymer is a polyolefin or polystyrene.
Claim 4
Dependent Claim
20 words
A high-performance electret according to claim 1 or claim 2, wherein the polar polymer is a polyester, polycarbonate or polyamide.
Claim 5
Dependent Claim
23 words
A high-performance electret according to any one of claims 1 to 3, wherein the modified polymer is a non-polar polymer modified by grafting.
Claim 6
Dependent Claim
35 words
A high-performance electret according to any one of claims 1 to 4 comprising a non-polar polymer modified with an unsaturated carboxylic acid or derivative thereof selected from maleic acid, endo-cis-bicyclo(2,2,1) -hepto-5-ene-2,3-dicarboxylic acid and anhydrides thereof.
Claim 7
Dependent Claim
29 words
A high-performance electret according to any one of claims 1 to 4 comprising a non-polar polymer modified with an unsaturated epoxy monomer selected from glycidyl acrylate and glycidyl methacrylate.
Claim 8
Dependent Claim
34 words
A high-performance electret according to any one of claims 1 to 4 comprising a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond selected from vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(methoxyethoxy)silane, vinylmethyldiethoxysilane and vinylphenyldimethoxysilane.
Claim 9
Dependent Claim
39 words
A high-performance electret according to any preceding claim comprising 80 to 95% by weight of a non-polar polymer, 1 to 10% by weight of a polar polymer and 4 to 10% by weight of at least one modified polymer.
Claim 10
Dependent Claim
38 words
A process for producing a high-performance electret as defined in any one of the preceding claims wherein a film formed of the necessary polymers, optionally after mono- or bi-axial drawing, is subjected to intermittent corona discharge and heat.
Claim 11
Dependent Claim
84 words
An air filter composed substantially of a fibrous polymeric electret, said electret comprising 60 to 99% by weight of a non-polar polymer, 0.5 to 39.5% by weight of a polar polymer and 0.5 to 20% by weight of at least one modified polymer selected from (A) a non-polar polymer modified with an unsaturated carboxylic acid or a derivative thereof, (B) a non-polar polymer modified with an unsaturated epoxy monomer and (C) a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond.
Claim 12
Dependent Claim
84 words
An air filter composed substantially of a fibrous polymeric electret, said electret comprising 60 to 99% by weight of a non-polar polymer, 0.5 to 39.5% by weight of a polar polymer and 0.5 to 20% by weight of at least one modified polymer selected from (A) a non-polar polymer modified with an unsaturated carboxylic acid or a derivative thereof, (B) a non-polar polymer modified with an unsaturated epoxy monomer and (C) a non-polar polymer modified with a silane monomer having an olefinically unsaturated bond.
References Cited (Backward Citations)
No citation records indexed.
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