US3811210A
Expired / Lapsed
US
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Mild cure finishing process incorporating improved catalyst systems to produce wrinkle resistant, durably pressed and creased cellulosic textile products
Assignee: United States Department of Agriculture
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Filing: 1972-01-26
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Granted: 1974-05-21
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Expires: 1992-01-26
Abstract
Abstract Improved catalyst systems have been found that can be used in place of the strong mineral acid catalysts previously required in the mild cure finishing process for cellulosic textiles. These improved catalyst systems consist of mixtures of ammonium chloride and an acid selected from the group, phosphoric acid, citric acid, oxalic acid, tartaric acid, and trichloroacetic acid. Unlike cellulosic fabrics treated by the mild cure finishing process with strong mineral acid catalysis, fabrics similarly processed with the improved catalyst systems need not be neutralized and washed immediately after curing to prevent strength loss during subsequent storage. The wrinkle resistant fabric thus produced may be used as a precured product or may be additionally processed to impart shape and creases by a combination of steam pressing and dry pressing.
Inventors
- 👤 N Cashen
- 👤 R Kullman
- 👤 R Reinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:56
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/45; D06M13/00; D06M13/322; D06M13/402; D06M13/425; D06M13/432
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
9 words
The process of claim 1 wherein R is alkyl.
Claim 2
Dependent Claim
9 words
The process of claim 2 wherein R is methyl.
Claim 3
Dependent Claim
9 words
The process of claim 1 wherein R is hydroxyalkyl.
Claim 4
Dependent Claim
9 words
The process of claim 4 wherein R is hydroxyethyl.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the acid is phosphoric acid.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the acid is citric acid.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein the acid is oxalic acid.
Claim 8
Dependent Claim
11 words
The process of claim 1 wherein the acid is tartaric acid.
Claim 9
Dependent Claim
11 words
The process of claim 1 wherein the acid is trichloroacetic acid.
Claim 10
Dependent Claim
297 words
A cellulosic textile finishing process for producing a durably creased and pressed cellulosic fabric, comprising: a. impregnating a cellulosic fabric, to a wet pickup of about from 80 to 100 percent, with an aqueous solution containing (1) as an agent for crosslinking cellulose, about from 10 to 20 percent of a member selected from the group consisting of dimethylol methyl carbamate, dimethylol dihydroxyethyleneurea, and isopropoxymethyl dihydroxyethyleneurea, (2) as a catalyst for catalyzing the crosslinking reaction between the fabric cellulose and said crosslinking agent, about from 0.5 to 3.4 percent of a mixture consisting of ammonium chloride and an acid selected from the group consisting of phosphoric acid, citric acid, oxalic acid, tartaric acid, and trichloroacetic acid, where the molar ratio of the ammonium chloride to the acid ranges about from 1:2 to 2:1, and (3) about from 0 to 0.7 percent of a polyethylene softener; b. heating the wet, impregnated fabric from step (a) for about from 1 to 12 minutes at a temperature of about from 60* C. to 100* C. to effect the crosslinking reaction between thE fabric cellulose and the crosslinking agent while simultaneously reducing the moisture content of the fabric to about from 2 to 5 percent; c. storing the crosslinked cellulosic fabric from step (b) for up to about 90 days; d. converting the crosslinked cellulosic fabric from step (c) into a particular textile form; e. steam pressing the crosslinked fabric from step (d) to remove the crosslinks and to crease and shape the fabric; and f. curing the creased and shaped fabric from step (e) at a temperature of about from 100* C. to 120* C. for about from 2 to 4 minutes to reintroduce the crosslinks and to durably set the creases and the smooth, pressed appearance of the fabric.
Claim 11
Dependent Claim
13 words
The process of claim 11 wherein the crosslinking agent is dimethylol methyl carbamate.
Claim 12
Dependent Claim
13 words
The process of claim 11 wherein the crosslinking agent is dimethylol dihydroxyethylene urea.
Claim 13
Dependent Claim
12 words
The process of claim 11 wherein the crosslinking agent is isopropoxymethyl dihydroxyethyleneurea.
Claim 14
Dependent Claim
11 words
The process of claim 11 wherein the acid is phosphoric acid.
Claim 15
Dependent Claim
11 words
The process of claim 11 wherein the acid is citric acid.
Claim 16
Dependent Claim
11 words
The process of claim 11 wherein the acid is oxalic acid.
Claim 17
Dependent Claim
11 words
The process of claim 11 wherein the acid is tartaric acid.
Claim 18
Dependent Claim
11 words
The process of claim 11 wherein the acid is trichloroacetic acid.
Claim 19
Dependent Claim
250 words
A cellulosic textile finishing process for producing a durably creased and pressed cellulosic fabric, comprising: a. impregnating a cellulosic fabric, to a wet pickup of about 100 percent, with an aqueous solution containing (1) as an agent for crosslinking cellulose about 15 percent of a member selected from the group consisting of dimethylol methyl carbamate, dimethylol dihydroxyethyleneurea and isopropoxymethyl dihyroxyethyleneurea, (2) as a catalyst for catalyzing the crosslinking reaction between the fabric cellulose and said crosslinking agent, about 2 percent of an equimolar mixture of ammonium chloride and phosphoric acid; b. heating the wet, impregnated fabric from step (a) for about from 4 to 7 minutes at a temperature of about from 60* C. to 100* C. to effect the crosslinking reaction between the fabric cellulose and the crosslinking agent while simultaneously reducing the moixture content of the fabric to about from 2 to 5 percent; c. storing the crosslinked fabric from step (b) for up to about 90 days; d. converting the crosslinked cellulose fabric from step (c) into a particular textile form; e. steam pressing the crosslinked fabric from step (d) with a home-type hand iron to remove the crosslinks and to crease and shape the fabric; and f. curing the creased and shaped fabric from step (e) by dry-ironing with a home-type hand iron at a temperature not exceeding about 165* C. for about from 2 to 4 minutes to reintroduce the crosslinks and to durably set the creases and the smooth, pressed appearance of the fabric.
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |