Patent US3957680A successfully refreshed from Google Patents.
US3957680A
Expired / Lapsed
US
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Process for the preparation of surface active agents
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1974-08-19
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Granted: 1976-05-18
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Expires: 1994-08-19
Abstract
Abstract Surface active agents are obtained by reacting, in water as solvent and under normal pressure, cresol, formaldehyde, sodium sulfite, and 2-hydroxynaphthalene. The surface active agents exhibit excellent high dispersing power upon finely grinding with disperse dyes and in use at high temperatures whereby they are effective in giving level dyeing to polyester fibers in high temperature dyeing processes and give little or no cellulose staining in dyeing a polyester/cellulose blended yarn or fabric by the thermosol process.
Inventors
- 👤 Fumio Fujii
- 👤 Koji Kurahara
- 👤 Akitoshi Igata
- 👤 Toshihiro Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:02
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C07; C07G; C07G99/00; C07G99/002; C08G8/24; C08G8/28; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086; C09K; C09K23/00; C09K23/12; D; D06; D06P; D06P1/00; D06P1/44; D06P1/52; D06P1/56; D06P1/62; D06P1/621; D06P1/622; D06P1/625; D06P3/00; D06P3/34; D06P3/52; D06P3/54; D06P3/82; D06P3/8204; D06P3/8223; D06P3/8228; D06P3/8233
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A process for the preparation of a surface active agent which comprises first adding cresol, sodium sulfite and 2-hydroxynaphthalene to water as solvent, then adding formaldehyde to the resultant solution and reacting the mixture under normal pressure to obtain said surface active agent.
Claim 2
Dependent Claim
43 words
A process for the preparation of a surface active agent which comprises first adding cresol, sodium sulfite and 2-hydroxynaphthalene to water as solvent, then adding formaldehyde to the resultant solution and reacting the mixture under normal pressure to obtain said surface active agent.
Claim 3
Dependent Claim
79 words
The process according to claim 1 wherein the formaldehyde is used in the proportion of 1.0 to 4.0 mols per mol cresol, the sodium sulfite is used in the proportion of 0.4 to 1.5 mols per mol cresol, the 2-hydroxynaphthalene is used in the proportion of 5 to 30 parts by weight per 100 parts by weight cresol and the water is used in the proportion of 280 to 500 parts by weight per 100 parts by weight cresol.
Claim 4
Dependent Claim
65 words
The process according to claim 1 wherein the formaldehyde is added in the form of formalin in portions with stirring, and wherein the reaction system is maintained at a temperature of not higher thant 50°C. until the end of the addition of the formaldehyde after which the reaction temperature is raised to within the range of 60°C. to the boiling point of the reaction system.
Claim 5
Dependent Claim
26 words
The process according to claim 1 wherein the cresol is a member selected from the group consisting of m-cresol, synthetic m-cresol, fractionated cresol and mixtures thereof.
Claim 6
Dependent Claim
79 words
The process according to claim 4 wherein the formaldehyde is used in the proportion of 1.0 to 4.0 mols per mol cresol, the sodium sulfite is used in the proportion of 0.4 to 1.5 mols per mol cresol, the 2-hydroxynaphthalene is used in the proportion of 5 to 30 parts by weight per 100 parts by weight cresol and the water is used in the proportion of 280 to 500 parts by weight per 100 parts by weight cresol.
Claim 7
Dependent Claim
64 words
The process according to claim 4 wherein the formaldehyde is added in the form of formalin in portions with stirring, and wherein the reaction system is maintained at a temperature of not higher than 50°C. until the end of the addition of formaldehyde after which the reaction temperature is raised to within the range of 60°C. to the boiling point of the reaction system.
Claim 8
Dependent Claim
12 words
A surface active agent prepared according to the 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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |