US4950529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyallylene sulfide nonwoven fabric
Assignee: Asahi Kasei Corp
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Filing: 1988-11-09
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Granted: 1990-08-21
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Expires: 2008-11-09
Abstract
Abstract A nonwoven fabric having a weight per unit area of 5 g/m 2 to 500 g/m 2 composed of a polyallyene sulfide fiber having a mean fiber diameter of 0.1 μm to 8.0 μm is provided. The nonwoven fabric of extra fine polyallylene sulfide fibers has superior heat resistance, wet heat resistance, resistance to chemicals and fire retardant properties, suitable for various filter applications.
Inventors
- 👤 Masataka Ikeda
- 👤 Tsukasa Shima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:45
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; D04H3/009; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; D01; D01F; D01F6/00; D01F6/58; D01F6/76; D01F6/765; D04H1/00; D04H1/40; D04H1/42; D04H1/4326; D04H1/54; D04H1/56; D04H1/70; D04H1/72; D04H1/724; D04H3/08; D04H3/16; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/16; D21H27/00; D21H27/08; B01D2239/00; B01D2239/04; B01D2239/0457; B01D2239/0471; B01D2239/06; B01D2239/0604; B01D2239/0622; B01D2239/12; B01D2239/1233; B01D2239/1291; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31533; Y10T442/00; Y10T442/60; Y10T442/68
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
A nonwoven fabric having a weight per unit area of 10 g/m 2 to 200 g/m 2 and a bulk density of 0.05 g/cm 3 to 0.50 g/cm 3 composed of an extra fine fiber obtained by melt-blowing a linear polymer of polyphenylene sulfide, wherein the mean diameter of the extra fine fiber is from 0.1 μm to 8.0 μm, and the melt flow rate of the extra fine fiber, measured under the condition of a load of 5 kg and a temperature of 315° C. in accordance with ASTM D-1238-82, is from 50 g per 10 minutes to 1,100 g per 10 minutes.
Claim 2
Dependent Claim
104 words
A nonwoven fabric having a weight per unit area of 10 g/m 2 to 200 g/m 2 and a bulk density of 0.05 g/cm 3 to 0.50 g/cm 3 composed of an extra fine fiber obtained by melt-blowing a linear polymer of polyphenylene sulfide, wherein the mean diameter of the extra fine fiber is from 0.1 μm to 8.0 μm, and the melt flow rate of the extra fine fiber, measured under the condition of a load of 5 kg and a temperature of 315° C. in accordance with ASTM D-1238-82, is from 50 g per 10 minutes to 1,100 g per 10 minutes.
Claim 3
Dependent Claim
30 words
A nonwoven fabric according to claim 1, wherein the melt flow rate of said polyphenylene sulfide fiber is from 80 g per 10 minutes to 800 g per 10 minutes.
Claim 4
Dependent Claim
30 words
A nonwoven fabric according to claim 2, wherein the melt flow rate of said polyphenylene sulfide fiber is from 100 g per 10 minutes to 600 g per 10 minutes.
Claim 5
Dependent Claim
13 words
A nonwoven fabric according to claim 1 produced by a paper making method.
Claim 6
Dependent Claim
51 words
A nonwoven fabric according to claim 1, wherein the melt flow rate of said linear polymer of polyphenylene sulfide, measured by the same method as that used to measure the melt flow rate of said extra fine fiber, is from 50 g per 10 minutes to 1,000 g per 10 minutes.
Claim 7
Dependent Claim
11 words
A filter composed of a nonwoven fabric according to claim 1.
References Cited (Backward Citations)
US3912695A
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JPS5230609A
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JPS55142757A
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JPS5633511A
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JPS5716954A
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JPS5831112A
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EP0102536A2
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JPS6128962A
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EP0195422A2
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |