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US3725508A
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Thiol derivatives of olefin-maleic anhydride copolymers
Assignee: Akzo America Inc
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Filing: 1971-03-18
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Granted: 1973-04-03
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Expires: 1991-03-18
Abstract
Abstract Olefin-maleic anhydride copolymers are provided wherein a portion of the anhydride moieties are converted to thio anhydride moieties. Other thio derivatives are also provided including the thio acids. These compounds are effective as stabilizers in vinyl type resins, particularly vinyl chloride polymers and can also serve as chelating agents.
Inventors
- 👤 W Stamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:32
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08F; C08F8/00; C08L35/00; C08L41/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
14 words
The composition of claim 1 wherein the vinyl polymer is a vinyl chloride polymer.
Claim 2
Dependent Claim
21 words
A polymeric composition containing a mixture of a vinyl polymer and a stabilizing amount of a polymeric compound having the formula:
Claim 3
Dependent Claim
14 words
The composition of claim 3 wherein the vinyl polymer is a vinyl chloride polymer.
Claim 4
Dependent Claim
21 words
A polymeric composition containing a mixture of a vinyl polymer and a stabilizing amount of a polymeric compound having the formula:
Claim 5
Dependent Claim
14 words
The composition of claim 5 wherein the vinyl polymer is a vinyl chloride polymer.
Claim 6
Dependent Claim
27 words
The composition of claim 2 wherein R is methylene, a and b equal 0, and n is a value of from about 25 to about 1,000 inclusive.
Claim 7
Dependent Claim
35 words
The composition of claim 4 wherein R is methylene, a and b equal 0, n is an integer having a value of from about 25 to about 1,000 inclusive, and M is hydrogen or sodium.
Claim 8
Dependent Claim
35 words
The composition of claim 1, wherein R is methylene a and b equal 0, n is an integer having a value of from about 25 to about 1,000 inclusive and M is hydrogen or sodium.
References Cited (Backward Citations)
US3574172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |