US5126012A
Expired / Lapsed
US
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High strength papers from floc and fibrids
Assignee: EIDP Inc
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Filing: 1991-01-18
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Granted: 1992-06-30
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Expires: 2011-01-18
Abstract
Abstract A high strength fibrid-floc sheet is made of a floc which can be carbon, aramid or glass. The fibrids are made from the following units: ##STR1## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 1,3-phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixtures of radicals.
Inventors
- 👤 Gary L. Hendren
- 👤 Hamid M. Ghorashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/20; D21H13/26; D21H13/36; D21H13/38; D21H13/40; D21H13/46; D21H13/50; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10S428/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
59 words
Fibrids consisting essentially of the following units: ##STR6## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 3-phenylene and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixture of radials.
Claim 2
Dependent Claim
59 words
Fibrids consisting essentially of the following units: ##STR6## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 3-phenylene and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixture of radials.
Claim 3
Dependent Claim
95 words
A high strength sheet structure consisting essentially of from 10 to 90 wt. % of floc of carbon, aramid or glass fiber held in place with from 90 to 10 wt. % of fused fibrids consisting essentially of the following units: ##STR7## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 1,3 phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixture of radicals.
Claim 4
Dependent Claim
95 words
A high strength sheet structure consisting essentially of from 10 to 90 wt. % of floc of carbon, aramid or glass fiber held in place with from 90 to 10 wt. % of fused fibrids consisting essentially of the following units: ##STR7## where n is 4 or 5; X is from 0.03 to 0.30 and Ar is a radical selected from 3,4'-oxydiphenylene, 4,4'-oxydiphenylene, 4,4'-sulfonyldiphenylene, 1,3 phenylene, 1-methyl-2,4-phenylene, and mixtures of such radicals with each other or mixtures of such radicals with up to 50 mol percent of 1,4-phenylene radicals based on the mixture of radicals.
Claim 5
Dependent Claim
12 words
A sheet structure according to claim 2 wherein carbon floc is employed.
Claim 6
Dependent Claim
12 words
A sheet structure according to claim 2 wherein aramid floc is employed.
Claim 7
Dependent Claim
12 words
A sheet structure according to claim 2 wherein glass floc is employed.
Claim 8
Dependent Claim
24 words
A sheet structure according to claim 2 wherein the fibrids consist essentially of the following units: ##STR8## wherein X is from 0.03 to 0.30.
Claim 9
Dependent Claim
24 words
A sheet structure according to claim 2 wherein the fibrids consist essentially of the following units: ##STR9## wherein X is from 0.03 to 0.30.
Claim 10
Dependent Claim
35 words
A sheet structure according to claim 2 where the fibrids consist essentially of the following units: ##STR10## wherein Ar is a 70/30 mixture of 1,3-phenylene and 1,4-phenylene radicals and X is from 0.03 to 0.30.
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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) | 1995-06-30 | 1995-12-30 | 1996-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-30 | 1999-12-30 | 2000-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-30 | 2003-12-30 | 2004-06-30 | $7700.00 | Window Closed / Lapsed |