US3987184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dimethylol dimethylhydantoin solution
Assignee: Glyco Inc
•
Filing: 1974-06-07
•
Granted: 1976-10-19
•
Expires: 1994-06-07
Abstract
Abstract Disclosed is (i) an aqueous solution containing from about 45 to 70% of 1,3-dimethylol-5,5-dimethylhydantoin, having from a maximum of 1.25% to no free formaldehyde, with at least 96.5% of its solute being that dimethylol dimethylhydantoin and having pH from about 7.6 to 7, and (ii) the preparation of that solution by admixing formaldehyde and 5,5-dimethylhydantoin in the ratio from about 1.85 to 2.4 mols of formaldehyde per mol of the dimethylhydantoin in water, adjusting the pH with a compatible alkalizing agent to enable conducting the reaction at a pH of at least 7 to about 9, and allowing the reactants to react at a temperature from about 22° to 65° C. and a pH from 9 to 7 for a time sufficient for the formation of the 1,3-dimethylol-5,5-dimethylhydantoin to be substantially completed. The solution is useful as a formaldehyde donor and for a preservative in various pastes, soaps, skin creams and liquid shampoos.
Inventors
- 👤 Donald Henry Foelsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:44
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/72; A; A61; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/49; A61K8/494; A61K8/4946; A61Q; A61Q19/00; A61Q5/00; A61Q5/02; A61K2800/00; A61K2800/40; A61K2800/52; A61K2800/524
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
The method of producing an aqueous solution of 1,3-dimethylol-5,5-dimethylhydantoin, which comprises admixing formaldehyde and 5,5-dimethylhydantoin in the ratio of from about 1.85 to 2.4 mols of formaldehyde per mol of the dimethylhydanton in water, adjusting the pH with a compatible alkalizing agent to enable conducting the reaction at a pH of at least 7 to about 9, and allowing the reactants to react at a temperature from about 22° to 65° C. and a pH from 9 to 7 for a time sufficient for the formation of the 1,3-dimethylol-5,5-dimethylhydantoin to be substantially completed.
Claim 2
Independent Claim
93 words
The method of producing an aqueous solution of 1,3-dimethylol-5,5-dimethylhydantoin, which comprises admixing formaldehyde and 5,5-dimethylhydantoin in the ratio of from about 1.85 to 2.4 mols of formaldehyde per mol of the dimethylhydanton in water, adjusting the pH with a compatible alkalizing agent to enable conducting the reaction at a pH of at least 7 to about 9, and allowing the reactants to react at a temperature from about 22° to 65° C. and a pH from 9 to 7 for a time sufficient for the formation of the 1,3-dimethylol-5,5-dimethylhydantoin to be substantially completed.
Claim 3
Dependent Claim
22 words
The method as claimed in claim 1, wherein the formaldehyde is used in the ratio of 1.95 to 2.1 mols of it.
Claim 4
Dependent Claim
24 words
The method as claimed in claim 2, wherein the formaldehyde is used in the ratio of from about 1.98 to 2 mols of it.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 2, wherein the reaction is conducted with the pH of the reaction mixture being from about 8.5 to 7.
Claim 6
Dependent Claim
17 words
The method as claimed in claim 4, wherein the pH is from about 8.3 to about 7.5.
Claim 7
Dependent Claim
19 words
The method as claimed in claim 2, wherein the reaction is conducted for from about 20 to 30 minutes.
Claim 8
Dependent Claim
34 words
The method as claimed in claim 2, wherein 1.98 to 2 mols of formaldehyde are used per mol of the dimethylhydantoin and the reaction is conducted at a pH of from 8.1 to 7.5.
Claim 9
Dependent Claim
23 words
The method as claimed in claim 1, wherein the resulting aqueous solution of the dimethylol-dimethylhydantoin has less than about 1.25% of free formaldehyde.
Claim 10
Dependent Claim
43 words
An aqueous solution of 1,3-dimethylol-5,5-dimethylhydantoin containing from about 45 to 70% of the dimethylol-dimethylhydantoin, having a maximum of 1.25% to no free formaldehyde and a pH from about 7.6 to 7, and with at least 96.5% of its solute being the dimethylol dimethylhydantoin.
Claim 11
Dependent Claim
43 words
An aqueous solution of 1,3-dimethylol-5,5-dimethylhydantoin containing from about 45 to 70% of the dimethylol-dimethylhydantoin, having a maximum of 1.25% to no free formaldehyde and a pH from about 7.6 to 7, and with at least 96.5% of its solute being the dimethylol dimethylhydantoin.
Claim 12
Dependent Claim
15 words
An aqueous solution as claimed in claim 9, wherein the dimethylol-dimethylhydantoin content is about 55%.
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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |