Patent US3759966A successfully refreshed from Google Patents.
US3759966A
Expired / Lapsed
US
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Polymeric tin mercaptides
Assignee: Pennwalt Corp
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Filing: 1971-05-25
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Granted: 1973-09-18
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Expires: 1991-05-25
Abstract
Abstract Polymeric tin mercaptides of the structure: WHERE R1 is the hydrocarbon residue of a cycloaliphatic dimercaptan, R2 and R3 are alkyl groups of four to about 10 carbon atoms, and x is an integer from about 2 to about 10, are complexed with a phenolic antioxidant. The resultant complexes are useful as non-toxic thermal stabilizers for polymers such as polyvinyl chloride.
Inventors
- 👤 P Morton
- 👤 B Buchholz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:57
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; C08K5/58; C07; C07F; C07F7/00; C07F7/22; C07F7/226
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
15 words
The stabilizer of claim 1 in which the cycloaliphatic mercaptan reactant is betamercaptoethyl-3(and 4) -mercaptocyclohexane.
Claim 2
Dependent Claim
13 words
The stabilizer of claim 1 in which the cycloaliphatic dimercaptan reactant is 2,9-p-menthanedithiol.
Claim 3
Dependent Claim
13 words
The stabilizer of claim 1 in which the dialkyltin compound is dibutyltin oxide.
Claim 4
Dependent Claim
13 words
The stabilizer of claim 1 in which the dialkyltin compound is dioctyltin oxide.
Claim 5
Dependent Claim
13 words
The stabilizer of claim 1 in which the phenolic antioxidant reactant is 2,6-ditertiary-butyl-4-methylphenol.
Claim 6
Dependent Claim
14 words
The stabilizer of claim 1 in which the phenolic antioxidant reactant is 4,4''-isopropylidene bisphenol.
Claim 7
Dependent Claim
21 words
The stabilizer of claim 1 in which the phenolic antioxidant reactant is the 3 to 1 condensate of 2-tertiary-butyl-4-methylphenol and crotonaldehyde.
Claim 8
Dependent Claim
13 words
The stabilizer of claim 2 in which the dialkyltin compound is dibutyltin oxide.
Claim 9
Dependent Claim
13 words
The stabilizer of claim 2 in which the dialkyltin compound is dioctyltin oxide.
Claim 10
Dependent Claim
13 words
The stabilizer of claim 2 in which the phenolic antioxidant reactant is 2,6-ditertiary-butyl-4-methylphenol.
Claim 11
Dependent Claim
14 words
The stabilizer of claim 2 in which the phenolic antioxidant reactant is 4,4''-isopropylidene bisphenol.
Claim 12
Dependent Claim
21 words
The stabilizer of claim 2 in which the phenolic antioxidant reactant is the 3 to 1 condensate of 2-tertiary-butyl-4-methylphenol and crotonaldehyde.
Claim 13
Dependent Claim
13 words
The stabilizer of claim 9 in which the phenolic antioxidant reactant is 2,6-ditertiary-butyl-4-methylphenol.
Claim 14
Dependent Claim
14 words
The stabilizer of claim 9 in which the phenolic antioxidant reactant is 4,4''-isopropylidene bisphenol.
Claim 15
Dependent Claim
21 words
The stabilizer Of claim 9 in which the phenolic antioxidant reactant is the 3 to 1 condensate of 2-tertiary-butyl-4-methylphenol and crotonaldehyde.
Claim 16
Dependent Claim
13 words
The stabilizer of claim 10 in which the phenolic antioxidant reactant is 2,6-ditertiary-butyl-5-methylphenol.
Claim 17
Dependent Claim
14 words
The stabilizer of claim 10 in which the phenolic antioxidant reactant is 4,4''-isopropylidene bisphenol.
Claim 18
Dependent Claim
21 words
The stabilizer of claim 10 in which the phenolic antioxidant reactant is the 3 to 1 condensate of 2-tertiary-butyl-4-methylphenol and crotonaldehyde.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |