US3625993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing carbamates
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1968-04-22
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Granted: 1971-12-07
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Expires: 1988-04-22
Abstract
Abstract Carbamates are produced by reacting alkyl amines with phosgene, directly admixing the resultant reaction mixture containing Nalkyl-carbamoyl chloride and alkyl isocyanate with an active hydrogen containing compound selected from the group consisting of aliphatic alcohols and thioalcohols, phenols and thiophenols, alicyclic alcohols and thioalcohols. The produced carbamate is recovered from this mixture in high-yield and purity.
Inventors
- 👤 Hans Peter Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:39
CPC Classifications
C; C07; C07C; C07C271/00; C07C271/06; A; A01; A01N; A01N47/00; A01N47/08; A01N47/10; H; H05; H05B; H05B41/00; H05B41/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
51 words
Process according to claim 1, wherein to said admixture an acid acceptor is added in an excess of the amount required to neutralize HC1, to react with said alkyl carbamoyl chloride to form alkyl isocyanate and to catalyze the reaction between said alkyl isocyanate and said unreacted HX-R2-Y to form carbamate.
Claim 2
Dependent Claim
24 words
Process according to claim 2, wherein prior to the addition of said acid acceptor a portion of the HCl is removed from said admixture.
Claim 3
Dependent Claim
13 words
Process according to claim 2, wherein the acid acceptor is a tertiary amine.
Claim 4
Dependent Claim
15 words
Process according to claim 1, wherein the active hydrogen containing compound is an aliphatic alcohol.
Claim 5
Dependent Claim
14 words
Process according to claim 1, wherein the active hydrogen containing compound is a phenOl.
Claim 6
Dependent Claim
15 words
Process according to claim 1, wherein the active hydrogen containing compound is an alicyclic alcohol.
Claim 7
Dependent Claim
9 words
Process according to claim 1, wherein Y is hydrogen.
Claim 8
Dependent Claim
9 words
Process according to claim 1, wherein Y is chlorine.
Claim 9
Dependent Claim
9 words
Process according to claim 1, wherein Y is bromine.
Claim 10
Dependent Claim
17 words
Process according to claim 1, wherein Y is an alkyl group having one to six carbon atoms.
Claim 11
Dependent Claim
9 words
Process according to claim 1, wherein HX-R2-Y is naphthol.
Claim 12
Dependent Claim
104 words
A process for producing pentyl-phenyl-N-methyl carbamate which comprises: a. admixing phosgene and methyl amine in a molecular ratio of at least 1 mol of phosgene per mol of methylamine at a temperature of from about 200* to 400* C. to produce a reaction mixture, b. admixing said first reaction mixture and pentyl-phenol in a molecular ratio of about 0.9 to 1.1 mol of pentyl-phenol per mol of methyl amine at a temperature below 95* C. to produce an admixture containing a major amount of said carbamate and minor amounts of HCl, unreacted pentyl-phenol, methyl-carbamoyl chloride and impurities, c. recovering said carbamate from the admixture.
Claim 13
Dependent Claim
48 words
Process according to claim 13, wherein to said admixture an acid acceptor is added in an excess of the amount required to neutralize HCl, to react with said methyl carbamoyl chloride to form methyl isocyanate and to catalyze the reaction between said methyl isocyanate and said unreacted pentyl-phenol.
Claim 14
Dependent Claim
24 words
Process according to claim 14, wherein prior to the addition of said acid acceptor a portion of the HCl is removed from said admixture.
Claim 15
Dependent Claim
13 words
Process according to claim 14, wherein the acid acceptor is a tertiary amine.
References Cited (Backward Citations)
US3057910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |