EP0221567A2
Expired / Lapsed
EP
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Method of preventing corrosion of apparatus for melt-processing polyarylene thioethers
Assignee: Kureha Corp
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Filing: 1986-11-07
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Granted: —
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Expires: 2006-11-07
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 l00 parts by weight of the polyarylene thioether 0.00l to l0 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
EP
Data Source
google_patents
Last Synchronized
2026-11-01 05:19
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: 12
Claim 1
Independent Claim
93 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 l00 parts by weight of the polyarylene thioether 0.00l to l0 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.
Claim 2
Independent Claim
93 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 l00 parts by weight of the polyarylene thioether 0.00l to l0 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.
Claim 3
Independent Claim
33 words
A method according to claim l, wherein the metal of the group IIa of the Periodic Table in the compound to be added to the polyarylene thiol is calcium, strontium, barium or magnesium.
Claim 4
Independent Claim
38 words
A method according to claim l or 2, wherein the aromatic carboxylic acid in the compound (iii) to be added to the polyarylene thioether is phthalic acid, terephthalic acid, pyromellitic acid, naphthoic acid, naphthalic acid or hydroxynaphthoic acid.
Claim 5
Independent Claim
29 words
A method according to any one of claims l through 3, wherein the compound to be added to the polyarylene thioether is calcium oxide, calcium hydroxide of magnesium hydroxide.
Claim 6
Independent Claim
27 words
A method according to any one of claims l through 3, wherein the compound to be added to the polyarylene thioether is calcium naphthoate or calcium phthalate.
Claim 7
Independent Claim
46 words
A method according to any one of claims l through 5, 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 8
Dependent Claim
75 words
A melt-formed article of a thermoplastic resin composition comprising l00 parts by weight of a polyarylene thioether and 0.00l to l0 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.
Claim 9
Dependent Claim
75 words
A melt-formed article of a thermoplastic resin composition comprising l00 parts by weight of a polyarylene thioether and 0.00l to l0 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.
Claim 10
Dependent Claim
39 words
A melt-formed article as set forth in claim 7, wherein the aromatic carboxylic acid in the compound (iii) to be added to the polyarylene thioether is phthalic acid, terephthalic acid, pyromellitic acid, naphthoic acid, naphthalic acid or hydroxynaphthoic acid.
Claim 11
Dependent Claim
27 words
A melt-formed article as set forth in claim 7, wherein the compound to be added to the polyarylene thioether is calcium oxide, calcium hydroxide or magnesium hydroxide.
Claim 12
Dependent Claim
32 words
l0. A melt-formed article as set forth in any one of claims 7 through 9, wherein the thermoplastic resin composition further comprises a reinforcing filler selected from inorganic fillers and fibrous fillers.
References Cited (Backward Citations)
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