US4058498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of treating liquids, stable under storage, especially for improving the wrinkle-free characteristics of cellulosic fabrics treated with the solution
Assignee: Individual
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Filing: 1975-08-01
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Granted: 1977-11-15
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Expires: 1995-08-01
Abstract
Abstract A process for preparing liquid treating agents, stable under storage, especially for improving the wrinkle-free characteristics of cellulosic textiles treated with the liquid in which urea is condensed with formaldehyde in an aqueous solution in the presence of glyoxylic acid. This condensation is carried out in a first step using an acid pH between 2 and 5 with a molar ratio of urea/formaldehyde/glyoxylic acid of 1 : 2 to 10 : 0.03 to 0.6 and at a temperature between 20° and 100° C. In a second stage the reaction is carried out at a slightly acidic pH between 6 and 7 at a temperature between 20° and 60° C with addition of a fresh quantity of urea and eventually a fresh quantity of formaldehyde in an aqueous solution so as to obtain an overall molar ratio of urea/formaldehyde/glyoxylic acid of 1 : 1.5 to 3.5 : 0.03 to 0.6.
Inventors
- 👤 Jean Claude Bonnet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:36
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
A process for preparing a fabric-treatment liquid, especially to reduce wrinkling of cellulosic fabrics and adapted to be stored for long periods, said process comprising: a. in a first stage condensing urea and formaldehyde in an aqueous solution in the presence of glyoxylic acid at a pH between two and five at a temperature of 20° C to 100° C and with a molar ratio of urea/formaldehyde/glyoxylic acid of substantially 1 : 2 to 10 : 0.03 to 0.6 to produce a precondensate; and b. in a second stage reacting said precondensate at a pH between 6 and 7, at a temperature between 20° C and 60° C with an additional quantity of urea to produce a final condensation with an overall molar ratio of urea/formaldehyde/glyoxylic acid of 1 : 1.5 to 3.5 : 0.03 to 0.6.
Claim 2
Dependent Claim
137 words
A process for preparing a fabric-treatment liquid, especially to reduce wrinkling of cellulosic fabrics and adapted to be stored for long periods, said process comprising: a. in a first stage condensing urea and formaldehyde in an aqueous solution in the presence of glyoxylic acid at a pH between two and five at a temperature of 20° C to 100° C and with a molar ratio of urea/formaldehyde/glyoxylic acid of substantially 1 : 2 to 10 : 0.03 to 0.6 to produce a precondensate; and b. in a second stage reacting said precondensate at a pH between 6 and 7, at a temperature between 20° C and 60° C with an additional quantity of urea to produce a final condensation with an overall molar ratio of urea/formaldehyde/glyoxylic acid of 1 : 1.5 to 3.5 : 0.03 to 0.6.
Claim 3
Dependent Claim
20 words
The process defined in claim 1 wherein, a step (b), an additional amount of formaldehyde is reacted with said precondensate.
Claim 4
Dependent Claim
32 words
The process defined in claim 1 wherein step (a) is carried out with said urea, formaldehyde and glyoxylic acid in a molar ratio of substantially 1 : 3 to 6 : 0.03-0.3.
Claim 5
Dependent Claim
21 words
The process defined in claim 1 wherein step (a) is carried out at the refluxing temperature of the reaction mixture thereof.
Claim 6
Dependent Claim
19 words
The process defined in claim 4 wherein step (a) is carried out at a pH between two and three.
Claim 7
Dependent Claim
19 words
The process defined in claim 1 wherein step (b) is carried out at a pH between 6.3 and 6.8.
Claim 8
Dependent Claim
21 words
The process defined in claim 1 wherein step (b) is carried out at a temperature between 40° C to 50° C.
Claim 9
Dependent Claim
31 words
The process defined in claim 1 wherein the condensation product of step (b) has a molar ratio of urea/formaldehyde/glyoxylic acid of substantially 1 : 2 to 3 : 0.03 to 0.3.
Claim 10
Dependent Claim
13 words
An antiwrinkling fabric treatment agent as made by a process of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |