US3968167A
Expired / Lapsed
US
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Methylol derivatives of polythiols
Assignee: Dow Chemical Co
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Filing: 1975-09-15
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Granted: 1976-07-06
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Expires: 1995-09-15
Abstract
Abstract Formaldehyde is reacted with a polythiol to give novel methylol derivatives of the polythiol. The methylol derivatives are useful in curing polyepoxides.
Inventors
- 👤 Richard A. Hickner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:45
CPC Classifications
C; C07; C07C; C07C323/00; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/66; C07C2601/00; C07C2601/12; C07C2601/14
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
The methylol derivative of a polythiol, said derivative having the formula: ##EQU6## wherein n is 1-3, one of R and R' is hydrogen and the other is hydrogen or methyl, and R" is hydrogen or methyl; or said derivative having the formula ##SPC1## wherein each R is --Cl, --Br, --SR 1 SY or --OR 2 SR 1 SY provided that at least two of said R groups independently are of said --SR 1 SY or --OR 2 SR 1 SY; R 1 is an alkylene group having 2 to 10 carbon atoms or an alkylene group having 2 to 10 carbon atoms having one or more --O-- or --S-- ether groups and R 2 is an alkylene group of 2 to 4 carbon atoms; and wherein at least one Y is --CH 2 OH with any remaining Y substituents being hydrogen.
Claim 2
Dependent Claim
141 words
The methylol derivative of a polythiol, said derivative having the formula: ##EQU6## wherein n is 1-3, one of R and R' is hydrogen and the other is hydrogen or methyl, and R" is hydrogen or methyl; or said derivative having the formula ##SPC1## wherein each R is --Cl, --Br, --SR 1 SY or --OR 2 SR 1 SY provided that at least two of said R groups independently are of said --SR 1 SY or --OR 2 SR 1 SY; R 1 is an alkylene group having 2 to 10 carbon atoms or an alkylene group having 2 to 10 carbon atoms having one or more --O-- or --S-- ether groups and R 2 is an alkylene group of 2 to 4 carbon atoms; and wherein at least one Y is --CH 2 OH with any remaining Y substituents being hydrogen.
Claim 3
Dependent Claim
19 words
The derivative of claim 1 wherein from 5 to 100 percent of the thiol groups are substituted with methylol.
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) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |