Patent US4183822A successfully refreshed from Google Patents.
US4183822A
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US
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Blowing agent composition
Assignee: Bayer AG
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Filing: 1978-01-18
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Granted: 1980-01-15
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Expires: 1998-01-18
Abstract
Abstract The present invention relates to a process for expanding thermoplastic polymer compositions, notably those containing polymers having processing temperatures in excess of 200° C. and/or containing an ingredient which is susceptible to ammonia, characterized in that as the blowing agent certain carbonates (notably zinc carbonate) are used. Preferably a nucleating agent and a weak acid are present to aid cell formation. The invention also includes expandable polymer compositions and blowing agent formulations containing the carbonates.
Inventors
- 👤 Kenneth T. Collington
- 👤 Rishi R. Puri
- 👤 Peter J. Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S521/00; Y10S521/908; Y10S521/91
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A storage stable blowing agent composition which comprises a mixture of 100 parts by weight of a compound selected from the group consisting of zinc carbonate and cadmium carbonate with 5-50 parts by weight of a nucleating agent, with the proviso that if there is an acid present in said composition said acid has a pK A value greater than 3 for each of its neutralisation points.
Claim 2
Dependent Claim
67 words
A storage stable blowing agent composition which comprises a mixture of 100 parts by weight of a compound selected from the group consisting of zinc carbonate and cadmium carbonate with 5-50 parts by weight of a nucleating agent, with the proviso that if there is an acid present in said composition said acid has a pK A value greater than 3 for each of its neutralisation points.
Claim 3
Dependent Claim
19 words
A composition as claimed in claim 1 which contains less than 10% by weight of ammonia-evolving organic blowing agent.
Claim 4
Dependent Claim
23 words
A composition as claimed in claim 1 wherein the nucleating agent is selected from the group consisting of fused oxides, silicates and clays.
Claim 5
Dependent Claim
41 words
A composition as claimed in claim 1 which also comprises up to 50% by weight, based on the weight of the carbonate, of an organic carboxylic acid all of whose neutralisation points have a pK A value of more than 5.
Claim 6
Dependent Claim
41 words
A blowing agent composition which comprises a particulate mixture of 100 parts by weight of zinc carbonate and a total of 5-50 parts by weight of one or more members selected from the group consisting of magnesium oxide, silica and talc.
Claim 7
Dependent Claim
41 words
A blowing agent composition which comprises a particulate mixture of 100 parts by weight of zinc carbonate and a total of 5-50 parts by weight of one or more members selected from the group consisting of magnesium oxide, silica and talc.
References Cited (Backward Citations)
US2386995A
Cited
US3466353A
Cited
GB1148119A
Cited
GB1296545A
Cited
GB1227146A
Cited
US3639649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |