US4255320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of alkyltin sulfides and alkyltin 2-acyloxyethlymecaptides as stabilizer compositons for polyvinyl chloride resin compositions
Assignee: Argus Chemical Corp
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Filing: 1978-06-08
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Granted: 1981-03-10
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Expires: 1998-06-08
Abstract
Abstract Stabilizer mixtures are provided for rigid polyvinyl chloride resin compositions, capable of enhancing the resistance of the polyvinyl chloride resin to the development of an early discoloration during the first five to twenty minutes of heating at elevated processing temperatures, of the order of 375 DEG F. and higher, comprising a monoalkyltin 2-acyloxyethylmercaptide and/or a dialkyltin 2-acyloxyethylmercaptide inadmixture with an alkyltin sulfide.
Inventors
- 👤 Lawrence R. Brecker
- 👤 Charles Keeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:23
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; C08K5/58
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
50 words
A stabilizer mixture for extrudable rigid polyvinyl chloride resin compositions effective in inhibiting the development of early discoloration when the composition is heated at 375° F., comprising at least one alkyltin 2-acyloxyethylmercaptide selected from the group consisting of monoalkyltin 2-acyloxyethylmercaptides and dialkyltin 2-acyloxyethylmercaptides and mixtures thereof, and an alkyltin sulfide.
Claim 2
Dependent Claim
50 words
A stabilizer mixture for extrudable rigid polyvinyl chloride resin compositions effective in inhibiting the development of early discoloration when the composition is heated at 375° F., comprising at least one alkyltin 2-acyloxyethylmercaptide selected from the group consisting of monoalkyltin 2-acyloxyethylmercaptides and dialkyltin 2-acyloxyethylmercaptides and mixtures thereof, and an alkyltin sulfide.
Claim 3
Dependent Claim
76 words
A stabilizer composition according to claim 1, in which the monoalkyltin 2-acyloxyethylmercaptide has the formula: R.sub.1 Sn--(SCH.sub.2 CH.sub.2 OR.sub.4).sub.3 in which: R 1 is an alkyl group having from one to about twenty-six carbon atoms; R 4 is H or ##STR34## not more than one R 4 being H; and R 2 and R 3 are selected from the group consisting of hydrogen and aliphatic hydrocarbon groups having from about one to about twenty carbon atoms.
Claim 4
Dependent Claim
76 words
A stabilizer composition according to claim 1, in which the dialkyltin 2-acyloxyethylmercaptide has the formula: (R.sub.1).sub.2 Sn--(SCH.sub.2 CH.sub.2 OR.sub.4).sub.2 in which: R 1 is an alkyl group having from one to about twenty-six carbon atoms; R 4 is H or ##STR35## not more than one R 4 being H; and R 2 and R 3 are selected from the group consisting of hydrogen and aliphatic hydrocarbon groups having from about one to about twenty carbon atoms.
Claim 5
Dependent Claim
49 words
A stabilizer composition according to claim 1, comprising a mixture of monoalkyltin and dialkyltin 2-acyloxyethylmercaptides in the proportion, expressed as tin content of the total tin present in the mixture, within the range from about 30 to about 90% monoalkyltin2-acyloxyethylmercaptide, and from about 10 to about 70% dialkyltin 2-acyloxyethylmercaptide.
Claim 6
Dependent Claim
50 words
A stabilizer composition according to claim 1, comprising a mixture of monoalkyltin and dialkyltin 2-acyloxyethylmercaptides in the proportion, expressed as tin content of the total tin present in the mixture, within the range from about 45 to about 75% monoalkyltin 2-acyloxyethylmercaptide, and from about 25 to about 55% dialkyltin 2-acyloxyethylmercaptide.
Claim 7
Dependent Claim
58 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide contains one alkyl group per tin atom, linked to tin through carbon, and a sulfide sulfur group, ═S, wherein the sulfide sulfur valences are linked to the same tin atom or to different tin atoms, the alkyl group having from one to about eight carbon atoms.
Claim 8
Dependent Claim
58 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide contains two alkyl groups per tin atom, linked to tin through carbon, and a sulfide sulfur group, ═S, wherein the sulfide sulfur valences are linked to the same tin atom or to different tin atoms, the alkyl groups having from one to about eight carbon atoms.
Claim 9
Dependent Claim
36 words
A stabilizer composition according to claim 1, wherein the alkyltin sulfide has the formula: R.sub.2 SnS wherein R is an alkyl group linked to tin through carbon, and containing from one to about eight carbon atoms.
Claim 10
Dependent Claim
51 words
A stabilizer composition according to claim 1, wherein the alkyltin sulfide has the formula: ##STR36## wherein R is an alkyl group linked to tin through carbon, and containing from one to about eight carbon atoms; and n is the number of units in the chain, and ranges up to about 100.
Claim 11
Dependent Claim
35 words
A stabilizer composition according to claim 1, wherein the alkyltin sulfide has the formula: ##STR37## wherein R is an alkyl group linked to tin through carbon, and containing from one to about eight carbon atoms.
Claim 12
Dependent Claim
43 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide is a polymer having one or more of the formulae: ##STR38## wherein R is an alkyl group linked to tin through carbon, and containing from one to about eight carbon atoms.
Claim 13
Dependent Claim
17 words
A stabilizer composition according to claim 1, in which the alkyltin 2-acyloxyethylmercaptide is an alkyltin mercaptoethyl tallate.
Claim 14
Dependent Claim
23 words
A stabilizer composition according to claim 1, in which the organotin sulfide is dioctyltin sulfide and the organotin 2-acyloxyethylmercaptide is monooctyltin tris-(mercaptoethyl tallate).
Claim 15
Dependent Claim
24 words
A stabilizer composition according to claim 1, in which the alkyltin 2-acyloxyethylmercaptide is monobutyl tin tris-(mercaptoethyl tallate) and the alkyltin sulfide is dibutyltin sulfide.
Claim 16
Dependent Claim
23 words
A stabilizer composition according to claim 1, in which the alkyltin 2-acyloxyethylmercaptide is monobutyltin tris-(mercaptoethyl tallate) and the alkyltin sulfide is dioctyltin sulfide.
Claim 17
Dependent Claim
15 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide is dibutyltin sulfide.
Claim 18
Dependent Claim
15 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide is butyltin sesquisulfide.
Claim 19
Dependent Claim
15 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide is dioctyltin sulfide.
Claim 20
Dependent Claim
15 words
A stabilizer composition according to claim 1, in which the alkyltin sulfide is octyltin sesquisulfide.
Claim 21
Dependent Claim
36 words
A rigid extrudable polyvinyl chloride resin composition having an enhanced resistance to early discoloration deterioration when heated at 375° F., consisting essentially of a polyvinyl chloride resin and a stabilizer composition in accordance with claim 1.
Claim 22
Dependent Claim
22 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, in which the polyvinyl chloride resin is polyvinyl chloride homopolymer.
Claim 23
Dependent Claim
27 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, in which the polyvinyl chloride resin is a copolymer of vinyl chloride and vinyl acetate.
Claim 24
Dependent Claim
34 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, in which the amount of stabilizer composition is within the range from about 0.1% to about 5% by weight of the composition.
Claim 25
Dependent Claim
24 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, including in addition a polyvalent metal salt of an aliphatic fatty acid.
Claim 26
Dependent Claim
18 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, including in addition an epoxy compound.
Claim 27
Dependent Claim
27 words
A rigid extrudable polyvinyl chloride resin composition in accordance with claim 20, comprising a plasticizer in an amount up to about 10% by weight of the composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |