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US3888801A
Expired / Lapsed
US
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Gas-expanding polymers using hydrazodicarboxylates
Assignee: Uniroyal Chemical Co Inc
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Filing: 1974-04-01
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Granted: 1975-06-10
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Expires: 1994-04-01
Abstract
Abstract Disclosed is the gas expansion or blowing of gas-expandable polymers with a particular class of dihydrocarbyl hydrazodicarboxylates, namely those wherein at least one of the two hydrocarbyl groups is a secondary or tertiary C3 to C5 alkyl group, especially isopropyl, secondary butyl, or tertiary butyl, while the other hydrocarbyl group is a primary, secondary or tertiary straight-chain or branched-chain alkyl group having from 1 to 8 carbon atoms, a cycloalkyl radical having from 5 to 8 carbon atoms, an aryl radical having from 6 to 10 carbon atoms, or an alkaryl or aralkyl radical having from 7 to 10 carbon atoms, and preferably is a C1 to C4 alkyl group. Of the di C1 to C4 alkyl hydrazodicarboxylates, those wherein both alkyl groups are secondary or tertiary such as diisopropyl, isopropyl secondary butyl, di-secondary butyl, and tertiary butyl hydrazodicarboxylates evolve the greatest volumes of gas upon decomposition and are therefore deemed to be the most effective for use in practicing the invention.
Inventors
- 👤 Byron A Hunter
- 👤 Franklin H Barrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:08
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/104
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
13 words
A COMPOSITION COMPRISING A GAS-EXPANDABLE POLYMERIC MATERIAL AND A COMPOUND HAVING A FORMULA:
Claim 2
Dependent Claim
13 words
A COMPOSITION COMPRISING A GAS-EXPANDABLE POLYMERIC MATERIAL AND A COMPOUND HAVING A FORMULA:
Claim 3
Dependent Claim
13 words
A composition comprising a gas-expandable polymeric material and a compound having the formula:
Claim 4
Dependent Claim
13 words
A composition comprising a gas-expandable polymeric material and a compound having the formula:
Claim 5
Dependent Claim
13 words
A composition comprising a gas-expanded polymeric material and a compound having the formula:
Claim 6
Dependent Claim
13 words
A composition comprising a gas-expanded polymeric material and a compound having the formula:
Claim 7
Dependent Claim
12 words
A composition according to claim 2 wherein said compound is diisopropyl hydrazodicarboxylate.
Claim 8
Dependent Claim
13 words
A composition according to claim 2 wherein said compound is di-secondary butyl hydrazodicarboxylate.
Claim 9
Dependent Claim
13 words
A composition according to claim 2 wherein said compound is methyl isopropyl hydrazodicarboxylate.
Claim 10
Dependent Claim
13 words
A composition according to claim 2 wherein said compound is ethyl isopropyl hydrazodicarboxylate.
Claim 11
Dependent Claim
14 words
A composition according to claim 2 wherein said compound is methyl secondary butyl hydrazodicarboxylate.
Claim 12
Dependent Claim
14 words
A composition according to claim 2 wherein said compound is ethyl secondary butyl hydrazodicarboxylate.
Claim 13
Dependent Claim
14 words
A composition according to claim 2 wherein said compound is isopropyl secondary butyl hydrazodicarboxylate.
Claim 14
Dependent Claim
13 words
A composition according to claim 2 wherein said compound is di-teritiary butyl hydrazodicarboxylate.
Claim 15
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 16
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 17
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 18
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 19
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 20
Dependent Claim
19 words
A process for expanding a gas-expandable polymeric material comprising incorporating with said polymeric material a compound having the formula:
Claim 21
Dependent Claim
12 words
A process according to claim 13 wherein said compound is diisopropyl hydrazodicarboxylate.
Claim 22
Dependent Claim
13 words
A process according to claim 13 wherein said compound is di-secondary butyl hydrazodicarboxylate.
Claim 23
Dependent Claim
13 words
A process according to claim 13 wherein said compound dis methyl isopropyl hydrazodicarboxylate.
Claim 24
Dependent Claim
13 words
A process according to claim 13 wherein said compound is ethyl isopropyl hydrazodicarboxylate.
Claim 25
Dependent Claim
14 words
A process according to claim 13 wherein said compound is methyl secondary butYl hydrazodicarboxylate.
Claim 26
Dependent Claim
14 words
A process according to claim 13 wherein said compound is ethyl secondary butyl hydrazodicarboxylate.
Claim 27
Dependent Claim
14 words
A process according to claim 13 wherein said compound is isopropyl secondary butyl hydrazodicarboxylate.
Claim 28
Dependent Claim
13 words
A process according to claim 13 wherein said compound is di-tertiary butyl hydrazodicarboxylate.
References Cited (Backward Citations)
US3111496A
Cited
US3306862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |