US4299951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating shaped arylene sulfide/sulfone polymer with organic liquid at elevated temperature
Assignee: Phillips Petroleum Co
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Filing: 1980-01-29
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Granted: 1981-11-10
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Expires: 2000-01-29
Abstract
Abstract The tensile strength of shaped articles made from arylene sulfide/sulfone polymers is increased by treating the article with an organic liquid at an elevated temperature. In one embodiment, the organic liquid comprises at least one of selected hydrocarbons, alcohols, and esters.
Inventors
- 👤 Robert W. Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:22
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/02; C08J7/08; C08J2381/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
A process for increasing the tensile strength of a shaped arylene sulfide/sulfone polymer which comprises contacting the shaped article with an organic liquid comprising at least one of: (a) saturated aliphatic and saturated cycloaliphatic hydrocarbons; (b) saturated aliphatic and saturated cycloaliphatic alcohols; and (c) saturated aliphatic and saturated cycloaliphatic esters of saturated aliphatic and saturated cycloaliphatic carboxylic acids at an elevated temperature which is below the melting point of the polymer for a period of time sufficient to increase the tensile strength of the shaped article.
Claim 2
Dependent Claim
86 words
A process for increasing the tensile strength of a shaped arylene sulfide/sulfone polymer which comprises contacting the shaped article with an organic liquid comprising at least one of: (a) saturated aliphatic and saturated cycloaliphatic hydrocarbons; (b) saturated aliphatic and saturated cycloaliphatic alcohols; and (c) saturated aliphatic and saturated cycloaliphatic esters of saturated aliphatic and saturated cycloaliphatic carboxylic acids at an elevated temperature which is below the melting point of the polymer for a period of time sufficient to increase the tensile strength of the shaped article.
Claim 3
Dependent Claim
31 words
A process according to claim 1 wherein said organic liquid comprises at least one of (a) cycloaliphatic hydrocarbon; (b) saturated aliphatic alcohol; and (c) saturated aliphatic ester or saturated aliphatic acid.
Claim 4
Dependent Claim
18 words
A process according to claim 2 wherein (a) is cyclohexane; (b) is n-butanol; and (c) is ethyl acetate.
Claim 5
Dependent Claim
42 words
A process according to claim 1 wherein the shaped article is heated at an elevated temperature which is at least 20° C. below the melting point of the polymer and the organic liquid is in the liquid phase at the elevated temperature.
Claim 6
Dependent Claim
33 words
A process according to claim 2 wherein said elevated temperature ranges from about 50° C. to about 200° C. and said period of time ranges from about 30 minutes to about 72 hours.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein said shaped article is molded from said polymer.
Claim 8
Dependent Claim
60 words
A process according to claim 1 wherein said shaped article is immersed in the organic liquid, maintained under liquid phase conditions at a temperature ranging from about 75° C. to about 150° C., and which is at least 20° C. below the melting point of the polymer for a period of time ranging from about 10 to about 40 hours.
Claim 9
Dependent Claim
33 words
A process according to claim 7 wherein the shaped article after being treated for a sufficient period of time to increase the tensile strength is removed from the treatment and allowed to dry.
Claim 10
Dependent Claim
29 words
A process according to claim 8 wherein the shaped article is removed from the treating liquid and subjected to further treatment to remove treating organic liquid prior to drying.
Claim 11
Dependent Claim
21 words
A process according to claim 9 wherein the shaped article is rinsed with water to remove organic liquid prior to drying.
Claim 12
Dependent Claim
16 words
A process according to claim 10 wherein the organic liquid is cyclohexane, n-butanol, or ethyl acetate.
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) | 1984-11-09 | 1985-05-11 | 1985-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-09 | 1989-05-11 | 1989-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-09 | 1993-05-11 | 1993-11-10 | $7700.00 | Window Closed / Lapsed |