US5283110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature copolyester monofilaments with enhanced knot tenacity for dryer fabrics
Assignee: Shakespeare and Company
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Filing: 1992-02-04
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Granted: 1994-02-01
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Expires: 2012-02-04
Abstract
Abstract A high temperature copolyester monofilament exhibits enhanced knot tenacity and is formed from the extrusion of a polymer blend of a copolyester resin and a fluoropolymer resin. Additives such as thermal stabilizers may be added to the polymer blend. The polymer blend may be extruded in the presence of other additives such as a hydrolytic stabilizer. The monofilament exhibits a higher average knot tenacity, a higher minimum knot tenacity, a narrower knot tenacity range and lower standard deviation as compared to standard high temperature copolyester monofilaments. A dryer fabric comprises a plurality of woven copolyester monofilaments having enhanced knot tenacity, the monofilaments comprising a polymer blend of copolyester resin and fluoropolymer resin, and may further include thermal stabilizers and hydrolytic stabilizers.
Inventors
- 👤 Jennifer A. Gardner
- 👤 Michelle A. Diaz-Kotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/88; D01F6/92; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3146
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
112 words
A high temperature copolyester monofilament having enhanced knot tenacity comprising: a polymer blend, extruded in the presence of from 0 to about 5 percent by weight of a hydrolytic stabilizer, wherein said polymer blend includes from about 99 to about 75 percent by weight of a high temperature copolyester resin consisting essentially of a copolymer comprising terephthalic acid, 1,4-dimethylolcyclohexane and isophthalic acid; from about 1 to about 25 percent by weight of a melt extruded fluoropolymer resin, to form 100 percent by weight of said blend; and from about 0.1 to about 10 percent by weight of a thermal stabilizer, with an appropriate reduction of at least one of the polymer components.
Claim 2
Dependent Claim
112 words
A high temperature copolyester monofilament having enhanced knot tenacity comprising: a polymer blend, extruded in the presence of from 0 to about 5 percent by weight of a hydrolytic stabilizer, wherein said polymer blend includes from about 99 to about 75 percent by weight of a high temperature copolyester resin consisting essentially of a copolymer comprising terephthalic acid, 1,4-dimethylolcyclohexane and isophthalic acid; from about 1 to about 25 percent by weight of a melt extruded fluoropolymer resin, to form 100 percent by weight of said blend; and from about 0.1 to about 10 percent by weight of a thermal stabilizer, with an appropriate reduction of at least one of the polymer components.
Claim 3
Dependent Claim
24 words
A monofilament, as in claim 1, wherein said polymer blend includes from about 5 to about 15 percent by weight of said fluoropolymer resin.
Claim 4
Dependent Claim
18 words
A monofilament, as in claim 1, wherein said polymer blend includes about 2.5 percent of said thermal stabilizer.
Claim 5
Dependent Claim
13 words
A monofilament, as in claim 1, wherein said hydrolytic stabilizer is a carbodiimide.
Claim 6
Dependent Claim
21 words
A monofilament, as in claim 1, wherein said fluoropolymer resin is selected from the group consisting tetrafluoroethylene-ethylene copolymer and chlorotrifluoroethylene-ethylene copolymer.
Claim 7
Dependent Claim
20 words
A monofilament, as in claim 1, exhibiting an average knot tenacity of from about 1.0 gpd to about 3.0 gpd.
Claim 8
Dependent Claim
20 words
A monofilament, as in claim 1, exhibiting a minimum knot tenacity of from about 0.6 gpd to about 2.0 gpd.
Claim 9
Dependent Claim
20 words
A monofilament, as in claim 1, exhibiting a knot tenacity range of from about 0.2 gpd to about 1.3 gpd.
Claim 10
Dependent Claim
122 words
A paper machine dryer fabric comprising: a plurality of woven high temperature copolyester monofilaments having enhanced knot tenacity; said monofilaments comprising a polymer blend, extruded in the presence of from 0 to about 5 percent by weight of a hydrolytic stabilizer, said polymer blend comprising from about 99 to about 75 percent by weight of a high temperature copolyester resin consisting essentially of a copolymer comprising terephthalic acid, 1,4-dimethylolcyclohexane and isophthalic acid; from about 1 to about 25 percent by weight of a melt extruded fluoropolymer resin, to form 100 percent by weight of said blend; and from about 0.1 to about 10 percent by weight of a thermal stabilizer, with an appropriate reduction of at least one of the polymer components.
Claim 11
Dependent Claim
122 words
A paper machine dryer fabric comprising: a plurality of woven high temperature copolyester monofilaments having enhanced knot tenacity; said monofilaments comprising a polymer blend, extruded in the presence of from 0 to about 5 percent by weight of a hydrolytic stabilizer, said polymer blend comprising from about 99 to about 75 percent by weight of a high temperature copolyester resin consisting essentially of a copolymer comprising terephthalic acid, 1,4-dimethylolcyclohexane and isophthalic acid; from about 1 to about 25 percent by weight of a melt extruded fluoropolymer resin, to form 100 percent by weight of said blend; and from about 0.1 to about 10 percent by weight of a thermal stabilizer, with an appropriate reduction of at least one of the polymer components.
Claim 12
Dependent Claim
24 words
A fabric, as in claim 9, wherein said polymer blend comprises from about 5 to about 15 percent by weight of said fluoropolymer resin.
Claim 13
Dependent Claim
18 words
A fabric, as in claim 9, wherein said polymer blend includes about 2.5 percent of said thermal stabilizer.
Claim 14
Dependent Claim
16 words
A fabric, as in claim 9, comprising about 1 percent by weight of said hydrolytic stabilizer.
Claim 15
Dependent Claim
21 words
A fabric, as in claim 9, wherein said fluoropolymer resin is selected from the group consisting tetrafluoroethylene-ethylene copolymer and chlorotrifluoro-ethylene-ethylene copolymer.
Claim 16
Dependent Claim
23 words
A fabric, as in claim 9 wherein said monofilaments exhibit an average knot tenacity of from about 1.0 gpd to about 3.0 gpd.
Claim 17
Dependent Claim
23 words
A fabric, as in claim 9 wherein said monofilaments exhibit a minimum knot tenacity of from about 0.6 gpd to about 2.0 gpd.
Claim 18
Dependent Claim
23 words
A fabric, as in claim 9 wherein said monofilaments exhibit a knot tenacity range of from about 0.2 gpd to about 1.3 gpd.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |