US3835191A
Expired / Lapsed
US
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Aldimines and ketimines containing hydroxymethyl groups and preparation thereof
Assignee: Bayer AG
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Filing: 1969-11-26
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Granted: 1974-09-10
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Expires: 1989-11-26
Abstract
Abstract Novel aldimines and ketimines which contain hydroxy methyl groups are provided. These new compounds are prepared by reacting Schiff''s bases which have active hydrogen atoms in Alpha position to the C N-group with formaldehyde or formaldehyde yielding compounds. The new compounds can, e.g., be used as plasticizing chain lengthening agents for the preparation of polyurethane plastics.
Inventors
- 👤 K Wagner
- 👤 M Hajek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6535; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3271; C08G18/3296
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
9 words
The compound according to claim 1 having the formula
Claim 2
Dependent Claim
9 words
The compound according to claim 1 having the formula
Claim 3
Dependent Claim
9 words
The compound according to claim 1 having the formula
Claim 4
Dependent Claim
9 words
The compound according to claim 1 having the formula
Claim 5
Dependent Claim
9 words
The compound according to claim 1 having the formula
Claim 6
Dependent Claim
11 words
A process which comprises reacting a Schiff''s base of the formula
Claim 7
Dependent Claim
19 words
The process of claim 7 wherein the reaction is carried out at a temperature of from 30* to 70*C.
Claim 8
Dependent Claim
17 words
The process of claim 7 wherein anhydrous formaldehyde is used in the reaction with said Schiff''s base.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein a semiacetal of formaldehyde obtained from formaldehyde and a mono- or polyalcohol is used.
Claim 10
Dependent Claim
26 words
The process of claim 7 carried out in a hydroxyl-containing solvent selected from the group consisting of linear or branched polyethers, polythioethers, polyacetals, polyesters and polycarbOnates.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |