US4396390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous formaldehyde textile finishing process
Assignee: Springs Industries Inc
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Filing: 1981-09-04
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Granted: 1983-08-02
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Expires: 2001-09-04
Abstract
Abstract A process of treating a textile fabric containing cellulosic fibers to impart crease resistance in which the fabric impregnated with an aqueous solution containing formaldehyde and a curing catalyst, vacuum is applied to the impregnated fabric to remove excess impregnation solution and provide a wet pickup of about 15 to 35 percent, and the fabric is then dried and cured.
Inventors
- 👤 James E. Hendrix
- 👤 George L. Payet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:06
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127; D06M2101/00; D06M2101/02; D06M2101/04; D06M2101/06; D06M2200/00; D06M2200/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
64 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating said fabric with an aqueous solution containing formaldehyde and a curing catalyst, applying a vacuum to the impregnated fabric to remove excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and drying and curing the thus treated fabric.
Claim 2
Dependent Claim
64 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating said fabric with an aqueous solution containing formaldehyde and a curing catalyst, applying a vacuum to the impregnated fabric to remove excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and drying and curing the thus treated fabric.
Claim 3
Dependent Claim
30 words
A process as set forth in claim 1 wherein the impregnation solution contains from about 1 to about 10 weight percent formaldehyde and said catalyst comprises a latent acid catalyst.
Claim 4
Dependent Claim
24 words
A process as set forth in claim 1 wherein said impregnating step comprises immersing the fabric and thoroughly saturating it with the impregnation solution.
Claim 5
Dependent Claim
29 words
A process as set forth in claim 1 wherein said step of applying a vacuum is performed so as to obtain a wet pickup of 20 to 30 percent.
Claim 6
Dependent Claim
30 words
A process as set forth in claim 1 wherein the drying and curing of the fabric is performed in a single step at temperatures of 250 to 450 degrees F.
Claim 7
Dependent Claim
79 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating and thoroughly saturating said fabric in an aqueous solution containing formaldehyde and a curing catalyst, applying a vacuum to the impregnated fabric to remove excess impregnation solution and provide about 1/2 to 3 percent by weight formaldehyde on the fabric, and drying and curing the thus treated fabric and fixing at least 90 percent of the applied formaldehyde on the fabric.
Claim 8
Dependent Claim
79 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating and thoroughly saturating said fabric in an aqueous solution containing formaldehyde and a curing catalyst, applying a vacuum to the impregnated fabric to remove excess impregnation solution and provide about 1/2 to 3 percent by weight formaldehyde on the fabric, and drying and curing the thus treated fabric and fixing at least 90 percent of the applied formaldehyde on the fabric.
Claim 9
Dependent Claim
28 words
A process as set forth in claim 6 wherein the catalyst in said impregnation solution is a latent acid catalyst, and the impregnation solution also includes a surfactant.
Claim 10
Dependent Claim
30 words
A process as set forth in claim 6 wherein the drying and curing of the fabric is performed in a single step at temperatures from 250 to 450 degrees F.
Claim 11
Dependent Claim
46 words
A process as set forth in claim 6 wherein said step of applying a vacuum to the fabric to remove excess impregnation solution is performed so as to provide a wet pickup of said solution on the fabric of about 15 to 35 percent by weight.
Claim 12
Dependent Claim
102 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating and thoroughly saturating said fabric with an aqueous solution containing from about 1 to about 10 percent by weight formaldehyde, a latent acid catalyst, and a surfactant, applying vacuum to the impregnated fabric to remove surface excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and drying and curing the thus treated fabric at a temperature of 250 to 450 degrees F. and chemically fixing on the fabric at least 90 percent of the applied formaldehyde.
Claim 13
Dependent Claim
102 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising impregnating and thoroughly saturating said fabric with an aqueous solution containing from about 1 to about 10 percent by weight formaldehyde, a latent acid catalyst, and a surfactant, applying vacuum to the impregnated fabric to remove surface excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and drying and curing the thus treated fabric at a temperature of 250 to 450 degrees F. and chemically fixing on the fabric at least 90 percent of the applied formaldehyde.
Claim 14
Dependent Claim
23 words
A process as set forth in claim 10 wherein said latent acid catalyst comprises magnesium chloride and said surfactant comprises a nonionic surfactant.
Claim 15
Dependent Claim
26 words
A process as set forth in claim 10 wherein said drying step includes chemically fixing on the fabric at least 95 percent of the applied formaldehyde.
Claim 16
Dependent Claim
117 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising advancing said fabric through a pad and saturating the fabric with an aqueous solution of from about 1 to about 10 percent by weight formaldehyde and an acid catalyst, directing the impregnated fabric from the pad and across a vacuum slot and applying a vacuum to the fabric to remove the surface excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and directing the fabric from the vacuum slot through a curing oven and heating the fabric to a temperature of 250 to 450 degrees F. to dry and cure the fabric.
Claim 17
Dependent Claim
117 words
A process of treating a textile fabric containing cellulosic fibers to impart crease resistance, said process comprising advancing said fabric through a pad and saturating the fabric with an aqueous solution of from about 1 to about 10 percent by weight formaldehyde and an acid catalyst, directing the impregnated fabric from the pad and across a vacuum slot and applying a vacuum to the fabric to remove the surface excess impregnation solution and to provide a wet pickup of about 15 to 35 percent by weight, and directing the fabric from the vacuum slot through a curing oven and heating the fabric to a temperature of 250 to 450 degrees F. to dry and cure the fabric.
Claim 18
Dependent Claim
26 words
A process according to claim 13 wherein said step of directing the fabric through a curing oven is performed while maintaining the fabric under widthwise tension.
Claim 19
Dependent Claim
23 words
A process according to claim 14 including heating the fabric in the curing oven at about 400 degrees F. for about 20 seconds.
Claim 20
Dependent Claim
31 words
A process according to claim 13 wherein said step of heating to dry and cure the fabric includes chemically fixing on the fabric at least 95 percent of the applied formaldehyde.
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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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |