US5316833A
Expired / Lapsed
US
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Paper machine clothing
Assignee: Albany International Corp
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Filing: 1992-12-18
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Granted: 1994-05-31
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Expires: 2012-12-18
Abstract
Abstract This invention relates to paper machine clothing and has particular reference to paper machine clothing suitable for use in the forming, presing and drying sections of a papermakng machine and comprises a monofilament and/or staple fibre in which themonofilament or staple fibre comprises a polyamide material which has been subjected to a treatment with an aqueous solution of aldehyde in the presence of a catalyst to effect partial cross-linking of the polyamide to provide a gel content thereof within the range of 0.1-75%.
Inventors
- 👤 Robert B. Davis
- 👤 Charles E. Kramer
- 👤 John P. Rooney, Jr.
- 👤 Chunghi H. Park
- 👤 Dana B. Eagles
- 👤 Joseph G. O'Connor
- 👤 Chian-Hsiang Lin
- 👤 Kathleen A. Tabis
- 👤 Maryann C. Kenney
- 👤 Jeffrey A. Emond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:14
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/42; D04H1/4326; D04H1/4334; D04H13/00; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/123; D06M13/127; D06M13/137; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/45; D21; D21F; D21F1/00; D21F1/0027; D21F7/00; D21F7/08; D21F7/083; Y; Y10; Y10S; Y10S8/00; Y10S8/21; Y10T; Y10T442/00; Y10T442/60; Y10T442/603; Y10T442/607
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
In an article of paper machine clothing comprising a base fabric having a carded batt of staple fibers needled into an upper layer thereof, said staple fibers comprising a polyamide material, the improvement comprising staple fibers of a polyamide material which have been subjected to a treatment with an aqueous solution of aldehyde in the presence of a catalyst to effect partial cross-linking of the polyamide to provide a gel content thereof within the range of 0.1-75% accompanied by a reduction in crystallinity in the range of 1-65% compared with the uncrosslinked material.
Claim 2
Dependent Claim
93 words
In an article of paper machine clothing comprising a base fabric having a carded batt of staple fibers needled into an upper layer thereof, said staple fibers comprising a polyamide material, the improvement comprising staple fibers of a polyamide material which have been subjected to a treatment with an aqueous solution of aldehyde in the presence of a catalyst to effect partial cross-linking of the polyamide to provide a gel content thereof within the range of 0.1-75% accompanied by a reduction in crystallinity in the range of 1-65% compared with the uncrosslinked material.
Claim 3
Dependent Claim
79 words
In an article of paper machine clothing, said article comprising a fabric including monofilament of a polyamide material, the improvement comprising monofilament of a polyamide material which has been subjected to a treatment with an aqueous solution of aldehyde in the presence of a catalyst to effect partial cross-linking of the polaymide to provide a gel content thereof within the range of 0.1-75% accompanied by a reduction in crystallinity in the range of 1-65% compared with the uncrosslinked material.
Claim 4
Dependent Claim
79 words
In an article of paper machine clothing, said article comprising a fabric including monofilament of a polyamide material, the improvement comprising monofilament of a polyamide material which has been subjected to a treatment with an aqueous solution of aldehyde in the presence of a catalyst to effect partial cross-linking of the polaymide to provide a gel content thereof within the range of 0.1-75% accompanied by a reduction in crystallinity in the range of 1-65% compared with the uncrosslinked material.
Claim 5
Dependent Claim
31 words
An article as claimed in claim 1 or 2, wherein the partially cross-linked polyamide has a reduced crystallinity compared with the uncrosslinked material by an amount within the range of 10-65%.
Claim 6
Dependent Claim
29 words
An article as claimed in claim 1 or 2, wherein the crosslinking is conducted to the extent that the gel content is within the range of 20 to 55%.
Claim 7
Dependent Claim
28 words
An article as claimed in claim 1 or 2, wherein the catalyst is selected from ammonium, amine or metallic salts thereof and mixtures of metallic salts with acids.
Claim 8
Dependent Claim
39 words
An article as claimed in claim 1 or 2, wherein the catalyst is selected from potassium hydrogen sulphate, potassium chloride, potassium iodide, potassium bromide, aluminum sulphate, calcium chloride, magnesium chloride, ammonium sulphide, ammonium sulphamate, ammonium bisulphite and ammonium nitrate.
Claim 9
Dependent Claim
18 words
An article as claimed in claim 1 or 2, wherein the catalyst comprises an organic or inorganic acid.
Claim 10
Dependent Claim
27 words
An article as claimed in claim 7, wherein the organic or inorganic acid is selected from formic acid, oxalic acid, citric acid, phosphoric acid, and phosphorous acid.
Claim 11
Dependent Claim
21 words
An article as claimed in claim 1 or 2, wherein the aldehyde is present within an amount of 5-30% by weight.
Claim 12
Dependent Claim
21 words
An article as claimed in claim 1 or 2, wherein the aldehyde is present in an amount of 10-20% by weight.
Claim 13
Dependent Claim
21 words
An article as claimed in claim 1 or 2, wherein the catalyst is present within an amount of 1-5% by weight.
Claim 14
Dependent Claim
19 words
An article as claimed in claim 1 or 2, wherein the aldehyde is selected from formaldehyde, aldehydes and dialdehydes.
Claim 15
Dependent Claim
29 words
An article as claimed in claim 1 or 2, wherein the aldehyde is selected from one or more of polyoxymethylene compounds and polymeric acetals prepared from formaldehyde and polyols.
Claim 16
Dependent Claim
25 words
An article as claimed in claim 1 or 2, wherein the aldehyde is a formaldehyde derivative selected from ureaformaldehyde, carbamates, cyclic ureas and amino triazines.
Claim 17
Dependent Claim
32 words
An article as claimed in claim 1 or 2, wherein the aqueous aldehyde together with a catalyst is applied tot he fibre at or above the glass transition temperature of the fibre.
Claim 18
Dependent Claim
70 words
An article as claimed in claim 1 or 2, wherein the polyamide is selected from polyamide 5, polyamide 6,6 polyamide 3, polyamide 4, polyamide 7, polyamide 9, polyamide, 8, polyamide 10, polyamide 11, polyamide 12, polyamide 13, polyamide 6,8, polyamide 6,9, polyamide 6,10, polyamide 6,12, polyamide 12,12, polyamide 6,6T and the polyamide of dimethylterephthalate and trimethylhexamethylene diamine, polyether block polyamides, compatible blends of polyamide with polyethylene, polypropylene and polyphenylene oxide.
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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) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |