US4147689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trifunctional antioxidant for polyolefins
Assignee: Eastman Chemical Co
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Filing: 1977-11-16
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Granted: 1979-04-03
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Expires: 1997-11-16
Abstract
Abstract Bis(alkylhydroxyphenylacyl) 3,3'-thiadicarboxylic acid dihydrazides are useful thermal antioxidants for polyolefins, and provide in a single compound the primary antioxidant, secondary antioxidant and copper deactivator functions. This is a continuation of application Ser. No. 709,679 filed July 29, 1976 now abandoned.
Inventors
- 👤 John W. Thompson
- 👤 Richard H. S. Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:40
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08K5/3725; C08K5/16; C08K5/22; C08K5/24; C08K5/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A stabilizer comprising a thiodicarboxyl, two hydrazo, and two ortho-alkylphenolic moieties as follows: ##STR4## wherein R 1 is a straight or branched alkyl group of 1-8 carbons; R 2 is selected from hydrogen, alkyl of 1-6 carbons, and aryl of 6-10 carbons; n is 0, 1 or 2; and m is 1 or 2.
Claim 2
Dependent Claim
54 words
A stabilizer comprising a thiodicarboxyl, two hydrazo, and two ortho-alkylphenolic moieties as follows: ##STR4## wherein R 1 is a straight or branched alkyl group of 1-8 carbons; R 2 is selected from hydrogen, alkyl of 1-6 carbons, and aryl of 6-10 carbons; n is 0, 1 or 2; and m is 1 or 2.
Claim 3
Dependent Claim
9 words
The stabilizer of claim 1 having the formula ##STR5##
Claim 4
Dependent Claim
9 words
The stabilizer of claim 1 having the formula ##STR6##
Claim 5
Dependent Claim
12 words
Polyolefin material containing a stabilizing amount of the stabilizer of claim 1.
Claim 6
Dependent Claim
17 words
Polyolefin material containing from about 0.01 to about 5.0% by weight of the stabilizer of claim 2.
Claim 7
Dependent Claim
17 words
Polyolefin material containing from about 0.01 to about 5.0% by weight of the stabilizer of claim 3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |