Patent US4105601A successfully refreshed from Google Patents.
US4105601A
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US
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3,3'-Carbonylbis(carbazates) as blowing agents
Assignee: Uniroyal Chemical Co Inc
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Filing: 1977-03-30
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Granted: 1978-08-08
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Expires: 1997-03-30
Abstract
Abstract Novel blowing agents are disclosed comprising 3,3'-carbonylbis(organo carbazates). The organo group may be alkyl, cycloalkyl, aryl or aralkyl moieties. In the preferred embodiment the organo group is an alkyl group selected from the group consisting of methyl, isopropyl, secondary butyl or tertiary butyl. The blowing agents find utility in the preparation of expanded organoplastic materials such as rubbers, thermosetting resins and thermoplastic resins.
Inventors
- 👤 Byron A. Hunter
- 👤 Franklin H. Barrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:04
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/104
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
A method of making a gas-expanded polymeric material which comprises blending a carbonylbis(organocarbazate) having the general formula ##STR6## or dihydrates thereof wherein R and R' are the same or different and are C 1 to C 6 alkyl, C 5 to C 6 cycloalkyl, phenyl or benzyl, with gas-expandable polymeric material and heating the resultant blend to a temperature sufficiently to decompose said carbonylbis(organocarbazate).
Claim 2
Independent Claim
64 words
A method of making a gas-expanded polymeric material which comprises blending a carbonylbis(organocarbazate) having the general formula ##STR6## or dihydrates thereof wherein R and R' are the same or different and are C 1 to C 6 alkyl, C 5 to C 6 cycloalkyl, phenyl or benzyl, with gas-expandable polymeric material and heating the resultant blend to a temperature sufficiently to decompose said carbonylbis(organocarbazate).
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein at least one of R and R' is methyl, isopropyl, sec-butyl or tert-butyl.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the carbonyl bis(organocarbazate) is 3,3'-carbonylbis(methyl carbazate), 3,3'-carbonylbis(isopropyl carbazate), 3,3'-carbonylbis(secondard butyl carbazate), 3,3'-carbonyl bis(tertiary butyl carbazate).
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the polymeric material is a polycarbonate, polysulfone or polyester.
Claim 6
Dependent Claim
19 words
The method of claim 4 wherein the carbonylbis(organocarbazate) is 3,3'-carbonylbis(methyl carbazate), 3,3'-carbonylbis(isopropyl carbazate), 3,3'-carbonylbis(secondary butyl carbazate), 3,3'-carbonylbis(tertiary butyl carbazate).
Claim 7
Dependent Claim
43 words
A composition comprising a gas expandable polymeric material and a compound having the general formula ROOCNHNHCONHNHCOOR' or dihydrates thereof wherein R and R' are the same or different and are C 1 -C 6 alkyl, C 5 -C 6 cycloalkyl, phenyl or benzyl.
Claim 8
Dependent Claim
43 words
A composition comprising a gas expandable polymeric material and a compound having the general formula ROOCNHNHCONHNHCOOR' or dihydrates thereof wherein R and R' are the same or different and are C 1 -C 6 alkyl, C 5 -C 6 cycloalkyl, phenyl or benzyl.
Claim 9
Dependent Claim
19 words
The composition of claim 6 wherein at least one of R and R' is methyl, isopropyl, sec-butyl or tert-butyl.
Claim 10
Dependent Claim
19 words
The composition of claim 6 wherein the compound is 3,3'-carbonylbis(methyl carbazate), 3,3'-carbonylbis(isopropyl carbazate), 3,3'-carbonylbis (sec-butyl carbazate) or 3,3'-carbonylbis(tert-butyl carbazate).
Claim 11
Dependent Claim
14 words
The composition of claim 6 wherein the polymeric material is polycarbonate, polysulfone or polyester.
References Cited (Backward Citations)
US3925270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-07 | 1982-02-06 | 1982-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-07 | 1986-02-06 | 1986-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-07 | 1990-02-06 | 1990-08-08 | $7700.00 | Window Closed / Lapsed |