US3715337A
Expired / Lapsed
US
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Preparation of poly(isocyanurate-urethanes) using trithiocarbonates as catalysts
Assignee: 3M Co
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Filing: 1971-06-01
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Granted: 1973-02-06
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Expires: 1991-06-01
Abstract
Abstract Polyisocyanates are trimerized, polymerized, or reacted with polyols in the presence of a trithiocarbonate salt catalyst, such as sodium ethyltrithiocarbonate, to produce polyisocyanurates, or poly(isocyanurate-urethanes).
Inventors
- 👤 M Allen
- 👤 Dyke G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:45
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/22; C08G18/225; C08G18/02; C08G18/022; C08G18/09; C08G18/092; C08G18/18; C08G18/1875; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A method of making poly(isocyanurate-urethanes) comprising mixing polyisocyanate with polyol in the presence of an effective amount of a trithiocarbonate salt polymerization catalyst having the formula(A)n-R-S-CS2 M wherein A is hydroxyl, mercapto or hydrogen, R is a polyvalent saturated aliphatic group, n is an integer equal to p-1, where p is the valence of R, and M is an alkali metal cation or a quaternary ammonium cation wherein the alkyl groups have from 1 to 18 carbon atoms each, each polyol being selected from the group consisting of polyalkylene ether polyols and polyesters and polyester amides containing plural reactive hydroxyl groups.
Claim 2
Independent Claim
101 words
A method of making poly(isocyanurate-urethanes) comprising mixing polyisocyanate with polyol in the presence of an effective amount of a trithiocarbonate salt polymerization catalyst having the formula(A)n-R-S-CS2 M wherein A is hydroxyl, mercapto or hydrogen, R is a polyvalent saturated aliphatic group, n is an integer equal to p-1, where p is the valence of R, and M is an alkali metal cation or a quaternary ammonium cation wherein the alkyl groups have from 1 to 18 carbon atoms each, each polyol being selected from the group consisting of polyalkylene ether polyols and polyesters and polyester amides containing plural reactive hydroxyl groups.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein R is alkyleneoxy-alkylene or poly(alkyleneoxy)-alkylene, and M is an alkali metal cation.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein R is propyleneoxy-propylene and M is sodium or potassium cation.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein said trithiocarbonate salt is used as a solution in polypropylene-ether-glycol or -triol.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said trithiocarbonate salt is sodium ethylthiocarbonate.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said trithiocarbonate salt is sodium dodecylthiocarbonate.
Claim 8
Dependent Claim
18 words
The method of claim 1 wherein said polyol is dipropylene glycol, polypropylene ether glycol, or polypropylene ether triol.
Claim 9
Dependent Claim
36 words
A solution of 0.1-20 weight percent of the trithio-carbonate salt defined in claim 1 in a polyol selected from the group consisting of polyalkylene ether polyols and polyesters and polyester amides containing plural reactive hydroxyl groups.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |