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US4258138A
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Method of foaming thermoplastic polymeric materials using tetrazole-containing heterocycles
Assignee: Dow Chemical Co
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Filing: 1979-10-15
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Granted: 1981-03-24
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Expires: 1999-10-15
Abstract
Abstract Method of foaming thermoplastic polymeric materials using as blowing agents polycyclic fused ring heterocycles containing the tetrazole moiety.
Inventors
- 👤 Thomas C. Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:48
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/108
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A method for the production of expanded resinous material which comprises incorporating into a thermoplastic polymeric resinous material polycyclic, tetrazole-containing, fused ring heterocycle blowing agents of the formula ##STR7## wherein R 1 is a radical selected from the group consisting of ##STR8## and R 2 is one or more members of the group consisting of hydrogen and the lower alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 2
Independent Claim
74 words
A method for the production of expanded resinous material which comprises incorporating into a thermoplastic polymeric resinous material polycyclic, tetrazole-containing, fused ring heterocycle blowing agents of the formula ##STR7## wherein R 1 is a radical selected from the group consisting of ##STR8## and R 2 is one or more members of the group consisting of hydrogen and the lower alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said thermoplastic polymeric resinous material is one or more of the group consisting of polycarbonate, polysulfones, polyphenylene oxides, high impact polystyrene, high density polyethylene, polypropylene, nylon, acrylonitrile-butadiene-styrene resins and high temperature siloxane polymers.
Claim 4
Independent Claim
13 words
The method of claims 1 or 2 wherein said blowing agent is 6-hydroxytetrazolo[5,1-a]phthalazine.
Claim 5
Independent Claim
13 words
The method of claims 1 or 2 wherein said blowing agent is ditetrazolo[a,c]quinoxaline.
Claim 6
Dependent Claim
75 words
An expandable resinous composition comprising thermoplastic polymeric resinous material having dispersed therein less than 5 percent by weight of polycyclic tetrazole-containing fused ring heterocycle blowing agents of the formula ##STR9## wherein R 1 is a radical selected from the group consisting of ##STR10## and R 2 is one or more members of the group consisting of hydrogen and the lowr alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 7
Dependent Claim
75 words
An expandable resinous composition comprising thermoplastic polymeric resinous material having dispersed therein less than 5 percent by weight of polycyclic tetrazole-containing fused ring heterocycle blowing agents of the formula ##STR9## wherein R 1 is a radical selected from the group consisting of ##STR10## and R 2 is one or more members of the group consisting of hydrogen and the lowr alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 8
Dependent Claim
39 words
The expandable resinous composition of claim 5 wherein said thermoplastic polymeric resinous material is selected from the group consisting of polycarbonate, polysulfones, polyphenylene oxides, high impact polystyrene, high density polyethylene, polypropylene, nylon, acrylonitrile-butadiene-styrene resins and high temperature siloxane polymers.
Claim 9
Dependent Claim
15 words
The expandable resinous composition of claims 5 or 6 wherein said blowing agent is 6-hydroxytetrazolo[5,1-a]phthalazine.
Claim 10
Dependent Claim
15 words
The expandable resinous composition of claims 5 or 6 wherein said blowing agent is ditetrazolo[a,c]quinoxaline.
Claim 11
Dependent Claim
75 words
An expanded resinous structure comprising thermoplastic polymeric resinous material having dispersed therein less than 5 percent by weight of polycyclic tetrazole-containing fused ring heterocycle blowing agent of the formula ##STR11## wherein R 1 is a radical selected from the group consisting of ##STR12## and R 2 is one or more members of the group consisting of hydrogen and the lower alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 12
Dependent Claim
75 words
An expanded resinous structure comprising thermoplastic polymeric resinous material having dispersed therein less than 5 percent by weight of polycyclic tetrazole-containing fused ring heterocycle blowing agent of the formula ##STR11## wherein R 1 is a radical selected from the group consisting of ##STR12## and R 2 is one or more members of the group consisting of hydrogen and the lower alkyls (C 1 -C 6 ) wherein n is an integer from 1 to 5.
Claim 13
Dependent Claim
39 words
The expanded resinous structure of claim 9 wherein said thermoplastic polymeric resinous material is selected from the group consisting of polycarbonate, polysulfones, polyphenylene oxides, high impact polystyrene, high density polyethylene, polypropylene, nylon, acrylonitrile-butadiene-styrene resins and high temperature siloxane polymers.
Claim 14
Dependent Claim
15 words
The expanded resinous structure of claims 9 or 10 wherein said blowing agent is 6-hydroxytetrazolo[5,1-a]phthalazine.
Claim 15
Dependent Claim
15 words
The expanded resinous structure of claims 9 or 10 wherein said blowing agent is ditetrazolo[a,c]quinoxaline.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |