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US4126590A
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Sulphonyltetrazoles as chemical blowing agents
Assignee: BASF Corp
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Filing: 1977-10-28
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Granted: 1978-11-21
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Expires: 1997-10-28
Abstract
Abstract Sulfonyltetrazoles of formula I, ##STR1## wherein n is 1 or 2, A is alkylene and R is a mono- or divalent hydrocarbon residue, are usable as blowing agents for thermoplastic polymers. These compounds decompose at temperatures above 200° C, therefore they can be used preferably for foaming thermoplasts of higher softening temperature such as aromatic polycarbonates, polyesters or polyethers.
Inventors
- 👤 Hugo Illy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:29
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/108
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
Process for foaming high melting thermoplastic polymeric materials by the addition of 0.05 to 5% by weight of a sulphonyltetrazole of the formula I ##STR7## wherein n is 1 or 2, A represents an alkylene group which has 1-5 C atoms and which can be substituted by phenyl, and R represents, if n is 1, alkyl having 1-4 C atoms, cyclohexyl, phenylalkyl having 7-8 C atoms, or an aryl group which has 6-10 C atoms and which can be substituted by alkyl having 1-2 C atoms, alkoxy having 1-2 C atoms, halogen, acylamino having 2-3 C atoms, carboxy or alkoxycarbonyl having 2-3 C atoms, and, if n is 2, represents phenylene, naphthylene or a radical of the formula II ##STR8## wherein X can be a direct bond, --O--, --S--, --SO 2 --, --CH 2 --, --C(CH 3 ) 2 -- or --NH--, to the thermoplastic material, and then heating the mixture.
Claim 2
Dependent Claim
151 words
Process for foaming high melting thermoplastic polymeric materials by the addition of 0.05 to 5% by weight of a sulphonyltetrazole of the formula I ##STR7## wherein n is 1 or 2, A represents an alkylene group which has 1-5 C atoms and which can be substituted by phenyl, and R represents, if n is 1, alkyl having 1-4 C atoms, cyclohexyl, phenylalkyl having 7-8 C atoms, or an aryl group which has 6-10 C atoms and which can be substituted by alkyl having 1-2 C atoms, alkoxy having 1-2 C atoms, halogen, acylamino having 2-3 C atoms, carboxy or alkoxycarbonyl having 2-3 C atoms, and, if n is 2, represents phenylene, naphthylene or a radical of the formula II ##STR8## wherein X can be a direct bond, --O--, --S--, --SO 2 --, --CH 2 --, --C(CH 3 ) 2 -- or --NH--, to the thermoplastic material, and then heating the mixture.
Claim 3
Dependent Claim
36 words
Process according to claim 1, wherein the thermoplastic material is polypropylene, a styrene copolymer, a polycarbonate, an aromatic polyether, a polysulphone ether, a polyester or a polyamide, and foaming is performed at 230° to 300° C.
Claim 4
Dependent Claim
38 words
Process according to claim 1, in which there is used a sulphonyltetrazole of the formula I wherein R represents methyl, phenyl or tolyl, A represents --CH 2 -- or --CH 2 CH 2 --, and n is 1.
Claim 5
Dependent Claim
27 words
Process according to claim 1, in which there is used a compound of the formula I wherein n is 2, R represents phenylene, and A represents methylene.
Claim 6
Dependent Claim
29 words
Process according to claim 1, in which there is used a sulphonyltetrazole of the formula I wherein R represents methyl, A represents --CH 2 --, and n is 1.
References Cited (Backward Citations)
US3442829A
Cited
US3873477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |