Patent US3903015A successfully refreshed from Google Patents.
US3903015A
Expired / Lapsed
US
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Blowing agent additive containing azodicarbonamide and an aromatic sulfinic acid
Assignee: Bayer AG
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Filing: 1974-03-22
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Granted: 1975-09-02
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Expires: 1994-03-22
Abstract
Abstract Aromatic sulphinic acids and their salts are used as activators for lowering the decomposition temperature of azodicarbonamide, which have a higher activity than the conventional auxiliary blowing agents. Moreover, no premature liberation of gas takes place.
Inventors
- 👤 Ernst Roos
- 👤 Theo Kempermann
- 👤 Manfred Abele
- 👤 Gunter Dammann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08J9/103
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
55 words
AN ACTIVATED BLOWING AGENT USEFUL FOR THE PRODUCTION OF CELLULAR OR POROUS ARTICLES OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC RUBBER, SAID ACTIVATED BLOWING AGENT COMPRISING AZODICARBONAMIDE AND FROM 0.5 TO 30 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID AZODICARBONAMIDE OF A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
55 words
AN ACTIVATED BLOWING AGENT USEFUL FOR THE PRODUCTION OF CELLULAR OR POROUS ARTICLES OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF NATURAL RUBBER AND SYNTHETIC RUBBER, SAID ACTIVATED BLOWING AGENT COMPRISING AZODICARBONAMIDE AND FROM 0.5 TO 30 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF SAID AZODICARBONAMIDE OF A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
17 words
The activated blowing agent of claim 1 wherein said compound of said formula is zinc di-(benzene sulphinate).
Claim 4
Dependent Claim
42 words
An activated blowing agent useful for the production of cellular or porous articles of synthetic resins, said activated blowing agent comprising azodicarbonamide and, for each part by weight of azodicarbonamide, 0.1 to 5 parts by weight of a compound of the formula
Claim 5
Dependent Claim
42 words
An activated blowing agent useful for the production of cellular or porous articles of synthetic resins, said activated blowing agent comprising azodicarbonamide and, for each part by weight of azodicarbonamide, 0.1 to 5 parts by weight of a compound of the formula
Claim 6
Dependent Claim
17 words
The activated blowing agent of claim 3 wherein said compound of said formula is zinc di-(benzene sulphinate).
Claim 7
Dependent Claim
33 words
The activated blowing agent of claim 3 wherein said compound of said formula is present in an amount of from 0.5 to 3.0 parts by weight for each part by weight of azodicarbonamide.
Claim 8
Dependent Claim
17 words
The activated blowing agent of claim 5 wherein said compound of said formula is zinc di-(benzene sulphinate).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |