Patent EP0246811A2 successfully refreshed from Google Patents.
EP0246811A2
Expired / Lapsed
EP
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Blended-fibre filter material
Assignee: BTG International Ltd
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Filing: 1987-05-14
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Granted: —
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Expires: 2007-05-14
Abstract
Abstract A filter material is a felt of 60 weight % 2.8 decitex polypropylene fibres and 40 weight % of 3.5 decitex modacrylic fibres.
Inventors
- 👤 Richard Colin Brown
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 21:43
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4291; D04H1/425; D04H1/43; D04H1/4326; D04H1/435; D04H1/4382; D04H1/43835; D04H1/44; D04H1/46; D04H1/70; D04H1/74; B; B01; B01D; B01D2239/00; B01D2239/06; B01D2239/0604; B01D2239/064; B01D2239/12; B01D2239/1225; B01D2239/1233; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2973; Y10T428/2975
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
21 words
A filter material which comprises a blend of (i) clean polyolefine fibres and (ii) clean fibres of a substituted addition polymer.
Claim 2
Dependent Claim
21 words
A filter material which comprises a blend of (i) clean polyolefine fibres and (ii) clean fibres of a substituted addition polymer.
Claim 3
Dependent Claim
17 words
A filter material according to Claim l, wherein the addition polymer comprises one or more substituted hydrocarbons.
Claim 4
Dependent Claim
15 words
A filter material according to Claim 2, wherein the substituent is -CN or a halogen.
Claim 5
Dependent Claim
15 words
A filter material according to Claim 2 or 3, wherein the hydrocarbon is a polyolefine.
Claim 6
Dependent Claim
16 words
A filter material according to Claim 4, wherein the polyolefine of (ii) is polyethylene or polypropylene.
Claim 7
Dependent Claim
24 words
A filter material according to Claim 4, wherein the fibres (ii) contain one or more of chloroethylene units or acrylonitrile units or tetrafluoroethylene units.
Claim 8
Dependent Claim
28 words
A filter material according to Claim 6, wherein the fibres (ii) are acrylic, polyvinyl chloride, polyvinylidene chloride, vinyl chloride - vinylidene chloride copolymer, chlorinated polyvinyl chloride or polytetrafluorethylene.
Claim 9
Dependent Claim
13 words
A filter material according to Claim 6, wherein the fibres (ii) are modacrylic.
Claim 10
Dependent Claim
33 words
A filter material according to Claim 8 wherein the modacrylic is a copolymer comprising from 35 to 85 weight percent acrylonitrile units and having the balance made up substantially of other addition-polymer-forming units.
Claim 11
Dependent Claim
19 words
l0. A filter material according to Claim 9, wherein the other addition-polymer-forming units are vinyl ester or halogenated hydrocarbon.
Claim 12
Dependent Claim
18 words
A filter material according to Claim 8, 9 or l0, wherein the modacrylic comprises at least 40% acrylonitrile.
Claim 13
Dependent Claim
15 words
A filter material according to Claim ll, wherein the modacrylic comprises at least 44% acrylonitrile.
Claim 14
Dependent Claim
15 words
A filter material according to Claim l2, wherein the modacrylic comprises at least 50% acrylonitrile.
Claim 15
Dependent Claim
18 words
A filter material according to any preceding claim, wherein the polyolefine fibres (i) are polyethylene or ethylene-propylene copolymer.
Claim 16
Dependent Claim
18 words
A filter material according to any of Claims l to l3, wherein the polyolefine fibres (i) are polypropylene.
Claim 17
Dependent Claim
25 words
A filter material according to any preceding claim, wherein the ratio of fibre (i) to fibre (ii) is from 30:70 to 80:20 by surface area.
Claim 18
Dependent Claim
24 words
A filter material according to Claim l6, wherein the ratio of fibre (i) to fibre (ii) is from 40:60 to 70:30 by surface area.
Claim 19
Dependent Claim
16 words
A filter material according to any preceding claim, wherein the fibres are finer than l00 micrometres.
Claim 20
Dependent Claim
17 words
A filter material according to Claim l8, wherein the fibre diameters are from l0 to 25 micrometres.
Claim 21
Dependent Claim
30 words
A filter material according to any preceding claim, wherein the fibre (i) cross-sectional area does not differ from the fibre (ii) cross-sectional area by more than a factor of 3.
Claim 22
Dependent Claim
20 words
2l. A filter material according to any preceding claim, wherein the fibre staple length is from 30 to 200 mm.
Claim 23
Dependent Claim
18 words
A filter material according to Claim 2l, wherein the fibre staple length is from 40 to l00 mm.
Claim 24
Dependent Claim
18 words
A filter material according to any preceding claim, wherein the fibres (i) or (ii) or both are crimped.
Claim 25
Dependent Claim
14 words
A filter material according to any preceding claim, in the form of a felt.
Claim 26
Dependent Claim
22 words
A filter material according to claim 24, wherein the felt is made by carding the fibres into a fleece and needling them.
References Cited (Backward Citations)
No citation records indexed.
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