US4108598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable press process
Assignee: Strike Corp
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Filing: 1976-12-02
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Granted: 1978-08-22
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Expires: 1996-12-02
Abstract
Abstract Cellulosic fiber-containing fabrics are made wrinkle resistant by a durable press process which comprises treating a cellulosic fiber-containing fabric with aqueous formaldehyde and a catalyst capable of catalyzing the cross-linking reaction between the formaldehyde and cellulose, heat-curing the treated cellulose fiber-containing fabric, preferably having a moisture content of more than 20% by weight, under conditions at which formaldehyde reacts with cellulose in the presence of the catalyst without a substantial loss of formaldehyde before the reaction of the formaldehyde with cellulose to improve the wrinkle resistance of the fabric.
Inventors
- 👤 George L. Payet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:27
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/12; D06M13/127
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
80 words
A durable press process for cellulosic fiber-containing fabrics which comprises treating the cellulosic fiber-containing fabric with aqueous formaldehyde and a catalyst capable of catalyzing the crosslinking reaction between formaldehyde and cellulose, heat curing said treated fabric by introducing the treated fabric into a heating zone and gradually increasing the temperature of the heating zone thereby gradually increasing the temperature of the heated fabric to prevent the loss of an amount of formaldehyde which will reduce the overall extent of curing.
Claim 2
Dependent Claim
80 words
A durable press process for cellulosic fiber-containing fabrics which comprises treating the cellulosic fiber-containing fabric with aqueous formaldehyde and a catalyst capable of catalyzing the crosslinking reaction between formaldehyde and cellulose, heat curing said treated fabric by introducing the treated fabric into a heating zone and gradually increasing the temperature of the heating zone thereby gradually increasing the temperature of the heated fabric to prevent the loss of an amount of formaldehyde which will reduce the overall extent of curing.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein the fabric has a moisture content of more than 20% by weight.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the heat curing consists of gradually increasing the temperature from 100° F to 230° F.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the temperature increase takes 5 minutes.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the catalyst is sulfuric acid, sulfurous acid, methane sulfonic acid or paratoluene sulfonic acid.
Claim 7
Dependent Claim
29 words
The process of claim 1 wherein the aqueous formaldehyde contains a binding agent which is a formaldehyde polymer with polyoxymethylene chains, carboxylated polymer, or an alkali soluble acrylic emulsion.
Claim 8
Dependent Claim
18 words
The process of claim 1 wherein the fabric has a moisture content of more that 30% by weight.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein the fabric is a 65%/35% polyester/cotton fabric.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the fabric contains from 50 to 60% by weight cotton or natural cellulose fibers.
Claim 11
Dependent Claim
77 words
A durable press process for cellulosic fiber-containing fabrics which comprises treating the cellulosic fiber containing fabric with aqueous formaldehyde and a catalyst capable of catalyzing the crosslinking reaction between formaldehyde and cellulose, heat curing said treated fabric by passing said treated fabric through zones of increasing temperatures to produce heat curing by gradually increasing the temperature of the treated fabric to prevent the loss of an amount of formaldehyde which will reduce the overall extent of curing.
Claim 12
Dependent Claim
77 words
A durable press process for cellulosic fiber-containing fabrics which comprises treating the cellulosic fiber containing fabric with aqueous formaldehyde and a catalyst capable of catalyzing the crosslinking reaction between formaldehyde and cellulose, heat curing said treated fabric by passing said treated fabric through zones of increasing temperatures to produce heat curing by gradually increasing the temperature of the treated fabric to prevent the loss of an amount of formaldehyde which will reduce the overall extent of curing.
Claim 13
Dependent Claim
19 words
The process of claim 10, wherein the fabric treated has a moisture content of more than 20% by weight.
Claim 14
Dependent Claim
19 words
The process of claim 10 wherein the fabric treated has a moisture content of more than 30% by weight.
Claim 15
Dependent Claim
14 words
The process of claim 10 wherein the formaldehyde is generated in situ from paraformaldehyde.
Claim 16
Dependent Claim
20 words
The process of claim 10 wherein the catalyst is sulfuric acid, sulfurous acid, methane sulfonic acid or paratoluene sulfonic acid.
Claim 17
Dependent Claim
13 words
The process of claim 10 wherein the fabric is a 65%/35% polyester/cotton fabric.
Claim 18
Dependent Claim
19 words
The process of claim 10 wherein the fabric contains at least 35% by weight cotton or natural cellulose fibers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |