Patent US3888818A successfully refreshed from Google Patents.
US3888818A
Expired / Lapsed
US
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Thermal stabilization of vinyl resins with derivatives of alpha-phenylindole
Assignee: Solvay SA
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Filing: 1973-09-07
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Granted: 1975-06-10
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Expires: 1993-09-07
Abstract
Abstract Thermal stabilizers for vinyl resins. The compounds are derivatives of alpha-phenylindole and have the formula: IN WHICH R1 is a linear or branched alkyl or a cycloalkyl radical containing from 4 to 20 carbon atoms. Such compounds may be prepared by acetylation with the aid of a Friedel-Crafts catalyst benzene substituted by an alkyl or cycloalkyl chain, then reacting the resulting acetophenone with phenylhydrazine in order to form the corresponding phenylhydrazone, which undergoes transposition according to the so called Fischer reaction, in the presence of an acid catalyst.
Inventors
- 👤 Claude Deblandre
- 👤 Jean Guyaux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:24
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/08; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08K5/3417
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
29 words
IN A THERMALLY STABILIZED VINYL RESIN COMPOSITION COMPRISING VINYL RESIN AND AT LEAST ONE THERMAL STABILIZER DISTRIBUTED THEREIN; THE IMPROVEMENT WHEREIN SAID STABILIZER COMPRISES A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
29 words
IN A THERMALLY STABILIZED VINYL RESIN COMPOSITION COMPRISING VINYL RESIN AND AT LEAST ONE THERMAL STABILIZER DISTRIBUTED THEREIN; THE IMPROVEMENT WHEREIN SAID STABILIZER COMPRISES A COMPOUND HAVING THE FORMULA:
Claim 3
Dependent Claim
18 words
An improved stabilized vinyl resin composition according to claim 1 wherein said resin is a vinyl chloride resin.
Claim 4
Dependent Claim
54 words
An improved stabilized vinyl resin composition according to claim 2 wherein said vinyl chloride resin is selected from the group consisting of homopolymers and copolymers of vinyl chloride and copolymerizable monomer selected from the group consisting of vinyl acetate, vinyl propionate, alkyl acrylate, vinylidene chloride, acrylonitrile, styrene, vinyl fluoride, vinylidene fluoride, ethylene and propylene.
Claim 5
Dependent Claim
32 words
An improved stabilized vinyl resin composition according to claim 1 wherein said stabilizer is present in an amount of from about 0.00025 to 0.00057 moles per 100 parts by weight of resin.
Claim 6
Dependent Claim
24 words
An improved stabilized vinyl resin composition according to claim 1 wherein R1 is fixed in the para position with respect to the phenyl-indole link.
Claim 7
Dependent Claim
28 words
An improved stabilized vinyl resin composition according to claim 1 wherein R1 is a linear or branched alkyl or cycloalkyl chain containing from 8 to 16 carbon atoms.
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) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |