US4411853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer stabilization
Assignee: Phillips Petroleum Co
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Filing: 1982-05-11
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Granted: 1983-10-25
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Expires: 2002-05-11
Abstract
Abstract The heat stability of arylene sulfide resins, such as poly(p-phenylene sulfide) resin, is improved by the addition of cure retarders comprising certain organotin compounds such as the dialkyltin dicarboxylates. The resin compositions of the invention are particularly applicable for reducing gel formation during melt extrusion.
Inventors
- 👤 Jerry O. Reed
- 👤 Ronald D. Mathis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:54
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/56; C08K5/57; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/58; D01F6/76; D01F6/765
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
A resin composition exhibiting improved heat stability comprising a poly(arylene sulfide) resin containing an effective stabilizing amount sufficient to retard resin curing and cross-linking of at least one of the group consisting of dialkyltin dicarboxylates, dibutyltin-S,S'-bis(isooctyl thioacetate) and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate).
Claim 2
Dependent Claim
44 words
A resin composition exhibiting improved heat stability comprising a poly(arylene sulfide) resin containing an effective stabilizing amount sufficient to retard resin curing and cross-linking of at least one of the group consisting of dialkyltin dicarboxylates, dibutyltin-S,S'-bis(isooctyl thioacetate) and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate).
Claim 3
Dependent Claim
11 words
An article of manufacture formed from the composition of claim 1.
Claim 4
Dependent Claim
11 words
A fiber or film formed from the composition of claim 1.
Claim 5
Dependent Claim
30 words
A composition according to claim 1 wherein the amount of stabilizer present ranges from about 0.1 to about 5 weight percent based on the weight of the arylene sulfide polymer.
Claim 6
Dependent Claim
25 words
A composition according to claim 4 wherein said arylene sulfide polymer is a poly(p-phenylene sulfide) having a melt flow of about 50 to about 400.
Claim 7
Dependent Claim
55 words
A composition according to claim 1 wherein said dicarboxylate is represented by the formulas [RCOO].sub.2 Sn(R').sub.2, ##STR3## wherein R is a hydrocarbyl group having from 1 to about 20 carbon atoms and, R' is a hydrocarbyl group having from 1 to about 10 carbon atoms, and y is an integer from 1 to about 30.
Claim 8
Dependent Claim
31 words
A composition according to claim 1 wherein said arylene sulfide polymer is poly(p-phenylene sulfide) and said stabilizer is dibutyltin maleate, bis(dibutyltin maleate), dibutyltin-S,S'-bis(isooctyl thioacetate) and di-n-butyl tin S,S 2 -bis(isooctyl 3-thiopropionate).
Claim 9
Independent Claim
53 words
A method for improving the heat stability of poly(arylene sulfide) resins which comprises incorporating therein an effective stabilizing amount of at least one of the group consisting of dialkyltin dicarboxylates, dibutyltin-S,S'-bis(isooctyl thioacetate and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate) which amount is sufficient to retard curing and cross-linking of said resin during heating.
Claim 10
Independent Claim
53 words
A method for improving the heat stability of poly(arylene sulfide) resins which comprises incorporating therein an effective stabilizing amount of at least one of the group consisting of dialkyltin dicarboxylates, dibutyltin-S,S'-bis(isooctyl thioacetate and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate) which amount is sufficient to retard curing and cross-linking of said resin during heating.
Claim 11
Dependent Claim
30 words
A method according to claim 8 wherein the amount of said stabilizer ranges from about 0.05 to about 2 weight percent based on the weight of the arylene sulfide polymer.
Claim 12
Dependent Claim
14 words
A process according to claim 8 wherein said arylene sulfide polymer is poly(p-phenylene sulfide).
Claim 13
Dependent Claim
52 words
A method according to claim 8 wherein said dicarboxylate has the formula [RCOO].sub.2 Sn(R').sub.2, ##STR4## wherein R is a hydrocarbyl group having from 1 to about 20 carbon atoms, R' is a hydrocarbyl group having from 1 to about 10 carbon atoms, and y is an integer from 1 to about 30.
Claim 14
Dependent Claim
31 words
A method according to claim 8 wherein said arylene sulfide polymer is poly(p-phenylene sulfide) and said stabilizer is dibutyltin maleate, bis(dibutyltin maleate), di-n-butyltin-S,S'-bis(isooctyl thioacetate or di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate).
Claim 15
Dependent Claim
26 words
A method according to claim 8 wherein said arylene sulfide polymer is a fiber or film grade poly(p-phenylene sulfide) having a melt flow of about 50-400.
Claim 16
Dependent Claim
75 words
In a process for melt extruding a poly(arylene sulfide) resin, the improvement for reducing gel formation during melt extrusion which comprises incorporating into said resin an effective heat stabilizing amount of at least one of the group consisting of dialkyltin dicarboxylates dibutyltin-S,S'-bis(isooctyl thioacetate) and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate, which amount is sufficient to retard curing and cross-linking of said resin during melt extrusion and thereby minimizing plugging of filters and spinnerets with gel.
Claim 17
Dependent Claim
75 words
In a process for melt extruding a poly(arylene sulfide) resin, the improvement for reducing gel formation during melt extrusion which comprises incorporating into said resin an effective heat stabilizing amount of at least one of the group consisting of dialkyltin dicarboxylates dibutyltin-S,S'-bis(isooctyl thioacetate) and di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate, which amount is sufficient to retard curing and cross-linking of said resin during melt extrusion and thereby minimizing plugging of filters and spinnerets with gel.
Claim 18
Dependent Claim
24 words
A process according to claim 14 wherein said resin is a poly(p-phenylene sulfide) resin having a melt flow of about 50 to about 400.
Claim 19
Dependent Claim
30 words
A process according to claim 14 wherein the amount of stabilizer added ranges from about 0.5 to about 2 weight percent based on the weight of the arylene sulfide polymer.
Claim 20
Dependent Claim
31 words
A process according to claim 14 wherein said resin is a poly(p-phenylene sulfide) resin and said stabilizer is dibutyltin maleate, bis(dibutyltin maleate), di-n-butyltin-S,S'-bis(isooctyl thioacetate) or di-n-butyl tin S,S 1 -bis(isooctyl 3-thiopropionate).
Claim 21
Dependent Claim
17 words
A process according to claim 17 wherein said poly(p-phenylene sulfide) has a melt flow of about 50-400.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |