US4016135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radioactive ray-resistant stabilizer
Assignee: Kureha Corp
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Filing: 1974-12-27
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Granted: 1977-04-05
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Expires: 1994-12-27
Abstract
Abstract A resin composition containing, as a radioactive ray-resistant stabilizer, an alkyl-substituted condensed tetracyclic hydrocarbon compound of the generic formula, [C.sub.16 H.sub.10 --R.sub.x wherein R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is an integer of 2 or more, R may be the same or different.
Inventors
- 👤 Masaaki Takahashi
- 👤 Akira Ito
- 👤 Shichiro Kawawata
- 👤 Jiro Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:56
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C08; C08K; C08K5/00; C08K5/01; Y; Y10; Y10S; Y10S524/00; Y10S524/925
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
59 words
A composition consisting essentially of a polymeric resin and, as a stabilizer against radioactivity, an alkyl-substituted condensed tetracyclic compound of the generic formula: ##STR3## wherein, R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
Claim 2
Dependent Claim
59 words
A composition consisting essentially of a polymeric resin and, as a stabilizer against radioactivity, an alkyl-substituted condensed tetracyclic compound of the generic formula: ##STR3## wherein, R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
Claim 3
Dependent Claim
65 words
The composition of claim 1, wherein said stabilizer is at least one compound selected from the group consisting of alkylfluoranthenes of the formula, ##STR4## and alkylpyrenes of the formula, ##STR5## wherein, R denotes an alkyl group having one to four carbon atoms an x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
Claim 4
Dependent Claim
13 words
The composition of claim 2, wherein said alkylfluoranthene is a mixture of isomers.
Claim 5
Dependent Claim
13 words
The composition of claim 2, wherein said alkylpyrene is a mixture of isomers.
Claim 6
Dependent Claim
110 words
The resin composition of claim 1, wherein said resin is selected from the group consisting of polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-ethylene copolymer, polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer, ethylene-propylene-diene copolymer, ethylene-vinyl acetate-grafted vinyl chloride copolymer, ethylene-ethyl acrylate grafted vinyl chloride copolymer, ethylene-propylene-grafted vinyl chloride copolymer, chlorinated polyethylene, chlorinated polyethylene-grafted vinyl chloride copolymer, polyurethane, ployamine, polyester, acrylic resin, butyl rubber, chloroprene rubber, nitrile rubber, natural rubber, silicone rubber, chlorosulfonated polyethylene, styrene-butadiene rubber, styrene-butadiene-acrylonitrile copolymer, acrylonitrile-styrene copolymer, polyester-ether elastomer, polyvinyl acetate, polyacrylic acid ester, chloroprene copolymer, furfuryl alcoholic resin, polyvinyl butyral, polyvinyl formal, phenol resin, epoxy resin and melamine resin.
Claim 7
Independent Claim
64 words
A method of stabilizing a polymeric composition against radioactivity consisting of adding to the composition a stabilizing amount of an alkyl-substituted condensed tetracyclic compound of the generic formula: ##STR6## wherein, R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
Claim 8
Independent Claim
64 words
A method of stabilizing a polymeric composition against radioactivity consisting of adding to the composition a stabilizing amount of an alkyl-substituted condensed tetracyclic compound of the generic formula: ##STR6## wherein, R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
Claim 9
Dependent Claim
64 words
The method of claim 6 wherein said alkyl-substituted condensed tetracyclic compound is selected from the group consisting of alkylfluoranthenes of the formula, ##STR7## and alkylpyrenes of the formula, ##STR8## wherein, R denotes an alkyl group having one to four carbon atoms and x is an integer from 1 to 4, and when x is 2 or more, R may be the same or different.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |