US4746698A
Expired / Lapsed
US
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Method of preventing corrosion of apparatus for melt-processing polyarylene thioethers
Assignee: Kureha Corp
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Filing: 1986-11-05
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Granted: 1988-05-24
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Expires: 2006-11-05
Abstract
Abstract Corrosion of a melt-processing apparatus for processing a polyarylene thioether at a temperature higher than the melting point thereof is prevented by a method which comprises adding to 100 parts by weight of the polyarylene thioether 0.001 to 10 parts by weight of at least one member selected from the group consisting of (i) hydroxides of metals of the group IIa of the Periodic Table, (ii) oxides of metals of the group IIa of the Periodic Table and (iii) aromatic carboxylic acid salts of metals of the group IIa of the Periodic Table. By this method, even if the melt-processing article obtained is exposed to moisture, the electrical properties of the article formed (for example, insulation characteristics) and the water resistance are not substantially deteriorated.
Inventors
- 👤 Toshitaka Kouyama
- 👤 Takao Iwasaki
- 👤 Takayuki Katto
- 👤 Zenya Shiiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:42
CPC Classifications
C; C23; C23F; C23F11/00; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
61 words
A method of preventing corrosion of a melt-processing apparatus for processing a polyarylene thioether at a temperature higher than the melting point thereof, which comprises adding to 100 parts by weight of the polyarylene thioether 0.001 to 10 parts by weight of at least one member selected from the group consisting of Ca(OH) 2 , CaO, BaO and BaO/BaCO 3 admixture.
Claim 2
Independent Claim
61 words
A method of preventing corrosion of a melt-processing apparatus for processing a polyarylene thioether at a temperature higher than the melting point thereof, which comprises adding to 100 parts by weight of the polyarylene thioether 0.001 to 10 parts by weight of at least one member selected from the group consisting of Ca(OH) 2 , CaO, BaO and BaO/BaCO 3 admixture.
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein the compound to be added to the polyarylene thioether is calcium oxide or calcium hydroxide.
Claim 4
Dependent Claim
41 words
A method according to claim 1, wherein, in the melt-processing apparatus, the portion thereof with which the melt of the polyarylene thioether heated at a temperature higher than the melting point thereof comes into contact is composed of a ferrous metal.
Claim 5
Dependent Claim
44 words
A melt-formed article of a thermoplastic resin composition comprising 100 parts by weight of a polyarylene thioether and 0.001 to 10 parts by weight of at least one member selected from the group consisting of Ca(OH) 2 , CaO, BaO and BaO/BaCO 3 admixture.
Claim 6
Dependent Claim
44 words
A melt-formed article of a thermoplastic resin composition comprising 100 parts by weight of a polyarylene thioether and 0.001 to 10 parts by weight of at least one member selected from the group consisting of Ca(OH) 2 , CaO, BaO and BaO/BaCO 3 admixture.
Claim 7
Dependent Claim
25 words
A melt-formed article as set forth in claim 4, wherein the compound to be added to the polyarylene thioether is calcium oxide or calcium hydroxide.
Claim 8
Dependent Claim
26 words
A melt-formed article as set forth in claim 4, wherein the thermoplastic resin composition further comprises a reinforcing filler selected from inorganic fillers and fibrous fillers.
Claim 9
Dependent Claim
19 words
A method according to claim 2, wherein the compound to be added to the polyarylene thioether is calcium hydroxide.
Claim 10
Dependent Claim
26 words
A method according to claim 1, wherein the compound to be added to the polyarylene thioether is barium oxide alone or in admixture with barium carbonate.
Claim 11
Dependent Claim
22 words
A melt-formed article as set forth in claim 5, wherein the compound to be added to the polyarylene thioether is calcium hydroxide.
Claim 12
Dependent Claim
29 words
A melt-formed article as set forth in claim 4, wherein the compound to be added to the polyarylene thioether is barium oxide alone or in admixture with barium carbonate.
Claim 13
Independent Claim
57 words
A method of preventing corrosion of a melt-processing apparatus for processing a polyarylene thioether at a temperature higher than the melting point thereof, which comprises adding to 100 parts by weight of the polyarylene thioether 0.001 to 10 parts by weight of at least one member selected from the group consisting of calcium naphthoate and calcium phthalate.
Claim 14
Independent Claim
57 words
A method of preventing corrosion of a melt-processing apparatus for processing a polyarylene thioether at a temperature higher than the melting point thereof, which comprises adding to 100 parts by weight of the polyarylene thioether 0.001 to 10 parts by weight of at least one member selected from the group consisting of calcium naphthoate and calcium phthalate.
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) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |