US4122290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of trimethylolalkanes
Assignee: Bayer AG
•
Filing: 1977-12-16
•
Granted: 1978-10-24
•
Expires: 1997-12-16
Abstract
Abstract An improved process for the preparation of a trimethylolalkane of the formula ##STR1## wherein R 1 denotes an aliphatic radical by reacting formaldehyde with an aldehyde of the formula ##STR2## wherein R 1 has the meaning indicated above and thereafter hydrogenating the resultant 2,2-dimethylolalkanal, the improvement residing in employing formaldehyde in a molar ratio of at least 8:1 to the aldehyde reactant, carrying out the aldehyde-formaldehyde reaction in the presence of an aldol condensation base at a temperature between -20 and 5° C, optionally in the presence of an ion of an element of group VII and/or VIII and/or sub-group I or II of the periodic system.
Inventors
- 👤 Otto Immel
- 👤 Hans-Helmut Schwarz
- 👤 Oskar Weissel
- 👤 Heinrich Krimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:16
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/36; C07C29/38; C07C29/132; C07C29/136; C07C29/14; C07C29/141; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/75
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A process for the preparation of a trimethylolalkane of the formula ##STR7## wherein R 1 represents an aliphatic radical which comprises contacting an aldehyde of the formula ##STR8## wherein R 1 has the meaning indicated above with formaldehyde employing a mol ratio of formaldehyde to aldehyde of at least 8:1 in the presence of an aldol condensation base at a temperature between -20° and 5° C. and thereafter hydrogenating the resultant 2,2-dimethylolalkanal.
Claim 2
Dependent Claim
72 words
A process for the preparation of a trimethylolalkane of the formula ##STR7## wherein R 1 represents an aliphatic radical which comprises contacting an aldehyde of the formula ##STR8## wherein R 1 has the meaning indicated above with formaldehyde employing a mol ratio of formaldehyde to aldehyde of at least 8:1 in the presence of an aldol condensation base at a temperature between -20° and 5° C. and thereafter hydrogenating the resultant 2,2-dimethylolalkanal.
Claim 3
Dependent Claim
40 words
A process according to claim 1 wherein the reaction of the aldehyde with formaldehyde is carried out in the presence of an ion of an element selected from the group consisting of cobalt, nickel, copper, manganese, zinc, silver, and cadmium.
Claim 4
Dependent Claim
28 words
A process according to claim 2 wherein the ion is present in an amount of 0.001 to 0.03 gram atom per mol of aldehyd of the formula II.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein the base is present in an amount of 0.01 to 0.3 mol per mol of aldehyde.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the reaction of the formaldehyde with the aldehyde is carried out at a pH of 9 to 12.
Claim 7
Dependent Claim
43 words
A process according to claim 1 wherein R 1 is a straight chain or branched alkyl radical having up to 12 carbon atoms which can optionally be substituted by an alkyl or alkoxy group having 1 to 3 carbon atoms in the chain.
Claim 8
Dependent Claim
40 words
A process according to claim 1 wherein the aldehyde-formaldehyde reaction is carried out in the presence of an ion of an element of group VII and/or VIII and/or sub-group I and/or sub-group II of the Period System of the Elements.
References Cited (Backward Citations)
DE1048567B
Cited
US2206379A
Cited
US2240735A
Cited
US2400724A
Cited
US3504042A
Cited
DE2431814A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |