CA1233610A - Method of melt processing and article made of a stabilized copolymer of vinyl chloride and chlorotrifluoroethylene - Google Patents
Method of melt processing and article made of a stabilized copolymer of vinyl chloride and chlorotrifluoroethyleneInfo
- Publication number
- CA1233610A CA1233610A CA000468282A CA468282A CA1233610A CA 1233610 A CA1233610 A CA 1233610A CA 000468282 A CA000468282 A CA 000468282A CA 468282 A CA468282 A CA 468282A CA 1233610 A CA1233610 A CA 1233610A
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- Prior art keywords
- copolymer
- vinyl chloride
- melt
- chlorotrifluoroethylene
- percent
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE A method comprising the step of melt processing stabilized composition comprising a copolymer comprising from 70 to 95, and preferably 75 to 90 percent by weight of vinyl chloride and from 5 to 30 and preferably 10 to 25 percent by weight of chlorotrifuloroethylene and an effective amount of a stabilizer. The step of melt processing includes extrude processing or roll mill processing. A preferred melt processing step is melt coating the copolymer onto a substrate such as a wire. The present invention includes a substrate such as a wire melt coated with the above-described stabilized copolymer.
Description
1~3361~1 METHOD OF MELT PROCESSING AND ARTICLE MODE OF A
STABILIZED COPOLYMER OF VINYL CHLORIDE AND
CHLOROTRIFLUOROETHYLENE
.
background OF THE INVENTION
The present invention is in the field of melt processing polymers and articles made therefrom; in particular, the present invention is directed to a method of melt processing a stabilized copolymer of vinyl chloride and chlorotrifluoroethylene and an article made from such a composition.
In order to melt process polyvinyl chloride, it is necessary to add plasticizers and stabilizers.
Unplasticized polyvinyl chloride is generally described as a rigid compound. In order tumult process polyvinyl chloride, a plasticizer is normally required. Polyvinyl chloride is described as being relatively unstable to heat and light. Stabilizers are typically added to improve the heat and light stability of the polymer.
Typical stabilizers include the metallic salts of lead, barium, tin, or cadmium. Oxides, hydroxides, or fatty acid salts are most effective Reference is made to FEW. Balmier, Jr., Textbook of Polymer Science, second edition, John Wiley & Sons, Inc. (1971) at pages 419 through 422.
Copolymers of vinyl chloride, and chlorotrifluoro-ethylene and processes to form the copolymers are described in a variety of publications and patents. A
typical process and publication is Japanese okay 74 60,391 which discloses copolymers of vinyl chloride and chlorotrifluoroethylene containing from 30 to 80 percent ~Z~3~;1~
vinyl chloride and 20 to 70 percent chlorotrifluoro-ethylene. The results of studies of polymers of vinyl chloride and chlorotrifluoroethylene are disclosed in J.
Ulbricht and K. Reseller, Synthesis of Copolymers of Vinyl Chloride and Trifluorochloroethylene, Plate Undo Kautschuk 22 (5), 390-393 (1975); and J. Ulbricht, Characterization and Properties of the Copolymers of Vinyl Chloride and Trifluoroethylene, Plate Undo Kautschuk 23 (7), 487-490 (1976). These references -I 10 disclose copolymers containing a wide variation of chlorotrifluoroethylene monomer and a copolymer of vinyl chloride and chlorotrifluoroethylene. In the Ulbricht article dated 1976 at page 4 it is noted that the heat stability of the vinyl chloride increases with the amount of chlorotrifluoroethylene incorporated into the copolymer. It is disclosed that the fusibility of the copolymer improves with the addition of chlorotrifluoro-ethylene.
SIJMMARY OF THE INVENTION
The present invention is a method comprising the step of melt processing a composition comprising a copolymer comprising from 70 to 95, and preferably 75 to 90 percent by weight of vinyl chloride and from 5 to 30 and preferably 10 to 25 percent by weight of chlorotri-fluoroethylene and an effective amount of a - stabilizer. Preferred stabilizes include organo-metal metallic stabilizers where the metal is selected from the group consisting of Cadmium, zinc, barium, calcium and mixtures thereof. The organic compound is preferably, an oxide, hydroxide, or fatty acid salt.
Preferably, the step of melt processing is extrude processing or roll mill processing. A particularly preferred melt processing step is melt coating the copolymer onto a substrate such as a wire. The present invention includes a wire melt coated with the above-described copolymer.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is a method comprising the ~Z33~
step of melt processing, a stabilized copolymer comprising from 70 to 95 and preferably 75 to 90 percent by weight of vinyl chloride and from 5 to 30 and preferably 10 to 25 percent by weight of chlorotri-fluoroethylene. The preferred embodiments of multiprocessing are extrude processing, roll mill processing and melt coating the copolymer onto a substrate.
As indicated in the Background of the Invention, in order to melt process polyvinyl chloride, it is 10 necessary to add plasticizer to the polyvinyl chloride. The addition of plasticizer presents several disadvantages. Included in these disadvantages are the fact that plasticizers are often volatile or at least diffuse to the surface of the polymer. A particular disadvantage is that the plasticizers are typically organic base compounds which reduce the fire resistance of the polymer composition and result in large amounts of smoke when the plasticized polyvinyl chloride burns. Unplasticized polyvinyl chloride does not melt drip burn, but rather chars when it burns.
Polychlorotrifluoroethylene is a melt process able compound which is extremely flame resistant. However, it is known to melt drip when it burns. A copolymer having 40 percent by weight of vinyl chloride and 60 percent by weight of chlorotrifluoroethylene melt drips - when it burns.
It has been found that a stabilized copolymer which is from 70 to 95 percent by weight of vinyl chloride and 5 to 30 percent by weight chlorotrifluoroethylene is useful in a method of melt processing. The stabilized copolymer requires no plasticizer, of the type required by polyvinyl chloride, to be melt process able. The copolymer has flame retardant properties such that it chars when it burns rather than melt drips A preferred copolymer comprises from 75 to 90 percent by weight of vinyl chloride and from 10 to 25 percent by weight of chlorotrifluoroethylene. The copolymer can contain up to 10 percent of other monomers so long as the joy terpolymer formed chars upon burning. Such other monomers can include tetrafluoroethylene, vinylidene fluoride, hexafluoroisobutylene, FOP and fluorinated vinyl monomers such as those disclosed in U.S. Pat. Nos.
4,123,602 and 3,~24,250 The copolymer of vinyl chloride and sheller-trifluoroethylene useful in the method of the present invention can be made by methods known to copolymerize vinyl chloride and chlorotrifluoroethylene which are known in the art. The preferred method is that disclosed in U.S. Serial No. 474,371, filed March 11, 1983, now U. S. Patent 4,515,927. Briefly, vinyl chloride monomer and chlorotrifluoroethylene monomer can be copolymerized in suspension using procedures applicable to the the homopolymerization vinyl chloride and suspension and well known to those skilled in the art. According to the preferred method, a copolymer having a constant rate ratio of vinyl chloride to chlorotrifluoroethylene is formed in a reactor. The suspension copolymerization is conducted by adding an initial charge having an excess of vinyl chloride to form a copolymer having a constant weight ratio of vinyl chloride to chlorotrifluoroethylene. The
STABILIZED COPOLYMER OF VINYL CHLORIDE AND
CHLOROTRIFLUOROETHYLENE
.
background OF THE INVENTION
The present invention is in the field of melt processing polymers and articles made therefrom; in particular, the present invention is directed to a method of melt processing a stabilized copolymer of vinyl chloride and chlorotrifluoroethylene and an article made from such a composition.
In order to melt process polyvinyl chloride, it is necessary to add plasticizers and stabilizers.
Unplasticized polyvinyl chloride is generally described as a rigid compound. In order tumult process polyvinyl chloride, a plasticizer is normally required. Polyvinyl chloride is described as being relatively unstable to heat and light. Stabilizers are typically added to improve the heat and light stability of the polymer.
Typical stabilizers include the metallic salts of lead, barium, tin, or cadmium. Oxides, hydroxides, or fatty acid salts are most effective Reference is made to FEW. Balmier, Jr., Textbook of Polymer Science, second edition, John Wiley & Sons, Inc. (1971) at pages 419 through 422.
Copolymers of vinyl chloride, and chlorotrifluoro-ethylene and processes to form the copolymers are described in a variety of publications and patents. A
typical process and publication is Japanese okay 74 60,391 which discloses copolymers of vinyl chloride and chlorotrifluoroethylene containing from 30 to 80 percent ~Z~3~;1~
vinyl chloride and 20 to 70 percent chlorotrifluoro-ethylene. The results of studies of polymers of vinyl chloride and chlorotrifluoroethylene are disclosed in J.
Ulbricht and K. Reseller, Synthesis of Copolymers of Vinyl Chloride and Trifluorochloroethylene, Plate Undo Kautschuk 22 (5), 390-393 (1975); and J. Ulbricht, Characterization and Properties of the Copolymers of Vinyl Chloride and Trifluoroethylene, Plate Undo Kautschuk 23 (7), 487-490 (1976). These references -I 10 disclose copolymers containing a wide variation of chlorotrifluoroethylene monomer and a copolymer of vinyl chloride and chlorotrifluoroethylene. In the Ulbricht article dated 1976 at page 4 it is noted that the heat stability of the vinyl chloride increases with the amount of chlorotrifluoroethylene incorporated into the copolymer. It is disclosed that the fusibility of the copolymer improves with the addition of chlorotrifluoro-ethylene.
SIJMMARY OF THE INVENTION
The present invention is a method comprising the step of melt processing a composition comprising a copolymer comprising from 70 to 95, and preferably 75 to 90 percent by weight of vinyl chloride and from 5 to 30 and preferably 10 to 25 percent by weight of chlorotri-fluoroethylene and an effective amount of a - stabilizer. Preferred stabilizes include organo-metal metallic stabilizers where the metal is selected from the group consisting of Cadmium, zinc, barium, calcium and mixtures thereof. The organic compound is preferably, an oxide, hydroxide, or fatty acid salt.
Preferably, the step of melt processing is extrude processing or roll mill processing. A particularly preferred melt processing step is melt coating the copolymer onto a substrate such as a wire. The present invention includes a wire melt coated with the above-described copolymer.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention is a method comprising the ~Z33~
step of melt processing, a stabilized copolymer comprising from 70 to 95 and preferably 75 to 90 percent by weight of vinyl chloride and from 5 to 30 and preferably 10 to 25 percent by weight of chlorotri-fluoroethylene. The preferred embodiments of multiprocessing are extrude processing, roll mill processing and melt coating the copolymer onto a substrate.
As indicated in the Background of the Invention, in order to melt process polyvinyl chloride, it is 10 necessary to add plasticizer to the polyvinyl chloride. The addition of plasticizer presents several disadvantages. Included in these disadvantages are the fact that plasticizers are often volatile or at least diffuse to the surface of the polymer. A particular disadvantage is that the plasticizers are typically organic base compounds which reduce the fire resistance of the polymer composition and result in large amounts of smoke when the plasticized polyvinyl chloride burns. Unplasticized polyvinyl chloride does not melt drip burn, but rather chars when it burns.
Polychlorotrifluoroethylene is a melt process able compound which is extremely flame resistant. However, it is known to melt drip when it burns. A copolymer having 40 percent by weight of vinyl chloride and 60 percent by weight of chlorotrifluoroethylene melt drips - when it burns.
It has been found that a stabilized copolymer which is from 70 to 95 percent by weight of vinyl chloride and 5 to 30 percent by weight chlorotrifluoroethylene is useful in a method of melt processing. The stabilized copolymer requires no plasticizer, of the type required by polyvinyl chloride, to be melt process able. The copolymer has flame retardant properties such that it chars when it burns rather than melt drips A preferred copolymer comprises from 75 to 90 percent by weight of vinyl chloride and from 10 to 25 percent by weight of chlorotrifluoroethylene. The copolymer can contain up to 10 percent of other monomers so long as the joy terpolymer formed chars upon burning. Such other monomers can include tetrafluoroethylene, vinylidene fluoride, hexafluoroisobutylene, FOP and fluorinated vinyl monomers such as those disclosed in U.S. Pat. Nos.
4,123,602 and 3,~24,250 The copolymer of vinyl chloride and sheller-trifluoroethylene useful in the method of the present invention can be made by methods known to copolymerize vinyl chloride and chlorotrifluoroethylene which are known in the art. The preferred method is that disclosed in U.S. Serial No. 474,371, filed March 11, 1983, now U. S. Patent 4,515,927. Briefly, vinyl chloride monomer and chlorotrifluoroethylene monomer can be copolymerized in suspension using procedures applicable to the the homopolymerization vinyl chloride and suspension and well known to those skilled in the art. According to the preferred method, a copolymer having a constant rate ratio of vinyl chloride to chlorotrifluoroethylene is formed in a reactor. The suspension copolymerization is conducted by adding an initial charge having an excess of vinyl chloride to form a copolymer having a constant weight ratio of vinyl chloride to chlorotrifluoroethylene. The
2 chlorotrifluoroethylene and an excess of weight of vinyl chloride are added to water. A catalyst is added which causes the copolymerization to take place. The catalysts which can be used are those which are useful in the suspension polymerization of vinyl chloride. The reactor is preferably held at from C to 70C. The vinyl chloride and chlorotrifluoroethylene copolymerize to form a copolymer having a constant weight ratio of vinyl chloride to chlorotrifluoroethylene changes.
The copolymer used in the process of the present invention can be stabilized with an effective amount of stabilizers useful to stabilize polyvinyl chloride.
Such stabilizers include those referenced in the Background of the Invention as well as those listed in 1;~3.:~6~(~
Modern Plastics Encyclopedia 1979-1980 Vol. 56, No. loan pages 696 through 710.
Preferred stabilizes include organo-metal metallic stabilizers where the metal is selected from the group consisting of Cadmium, zinc, barium, calcium and mixtures thereof. The organic compound is preferably, an oxide, hydroxide, or fatty acid salt.
The stabilized copolymer is melt process according to the method of the present invention. In accordance with the present invention, the copolymer is heated to above its melting temperature. Preferably, it is heated to from 170C to 230C, and more preferably from 190C
to 200C.
The step of melt processing can be any useful method of melt processing thermoplastic materials.
Typical melt processes which can be used in accordance with the method of the present invention are disclosed in Modern Plastics Encyclopedia 1973-80, Vol. 56, No.
loan pages 247, 248, 265, 308, 332 and 381.
2 These include extrusion coating and laminating, compression molding, extrusion, lamination to form film, rotational molding and other types of molding such as injection molding. Preferred embodiments of melt processing include extrude processing, roll mill processing, and melt coating preferably by extrusion coating, and laminating. A
particularly preferred use of the process of the present invention is melt coating the copolymer onto a substrate, such as a wire.
The present invention is useful to form a coated substrate, preferably a coated wire comprising a wire, and a melt coating on the wire. The melt coating comprises the stabilized copolymer as noted above which contains 70 to 95 percent by weight by vinyl chloride and 5 to 35 percent by weight of chlorotrifluoroethy-tone. The wire can be any wire known in the art which can be coated according to the process of the present invention. Typically, the wires are made of copper, ,, .
lZ3~
aluminum, steel, and associated alloys. The wires can be of any thickness which can be coated. The wires can be primary wires or a coating jacket such as a plenum jacket covering a bundle of primary wires. The coating is applied by suitable melt coating technique. A
preferred coating method is using an extrude to melt the copolymer and coat the wire with a cross-head die.
The thickness of the coating on the wire can be as thick as can be made by known wire coating methods.
10 Typically, primary wire is coated to a thickness of from 4-15 miss and preferably 7 to 10 miss, and plenum jacket coating thickness can range from 10 to 40 miss.
Several examples are set forth below to illustrate the nature of the invention and the manner of carrying it out. However, the invention should not be considered as being limited to details thereof.
EXAMPLES
-About 400 grams of vinyl chloride chlorotrifluoro-ethylene copolymers was made in accordance with the 20 procedures disclosed in U.S. Serial No. 474,371, filed March 11, 1983. The copolymer had between 15 to 20 percent by weight of chlorotrifl~oroethylene and correspondingly between 80 and 85 percent of vinyl chloride.
- The above copolymer was heated to 195C. The copolymer discolored immediately and became dark black char after 10 minutes.
One hundred grams of the above copolymer was combined with 1.5 grams of Veiniest HA vinyl stabilizer which is believed to be a barrium/cadmium soap and one gram of calcium Stewart. This composition was extruded into a rod form by a plunger extrude at 195C. The composition was extrudable but had poor thermos stability. The composition darkened in color during the extrusion process.
EYE
Three hundred grams of a composition comprising 100 parts by weight of the above-recited copolymer 2.5 parts by weight of the HA stabilizer, 1.0 parts by weight of calcium Stewart, and additionally 1.5 parts by weight of Mark 5050 pentaerythrityl/phosphite stabilizer was added and 1.0 parts of Drape 10.4 epoxy plasticizer was also used. Drape 10.4 although called an epoxy plasticizer is used as a stabilizer in the composition of this Example. Argus Product Data Sheet 12/79-10.4, Drape 10.4 describes Drape 10.4 epoxy plasticizer as, "designed specifically to provide non-toxic compounds with optimum heat stabilizing action . . . ." This composition was extruded through a Hake one inch single screw extrude having an L/Dra~io of 24. The extrude was operated at Zone 1-160C, Zone 2-170C, Zone 3-180C and die at 190C. The extrude was operated at 15 to 25 rum. The extradite appeared to have good neological properties although it had some degradation including bubbles and poor color.
COMPARATIVE_ Example 2 was repeated using Firestone Corp. FC-461 vinyl chloride/chlorotrifluoroethylene copolymer containing 40 percent by weight vinyl chloride and 60 percent by weight chlorotrifluoroethylene. The extrusion conditions were the same but the extrude was run as 50 to 60 rum. The extradite had slight degradation and bubbles but appeared to have good theological properties.
The copolymer from Example 2 and Comparative 2 were tested in accordance with the Limiting Oxygen Index test, ASTM standard D-28~3-77. This method provides for measuring of the minimum concentrations of oxygen and a flowing mixture of oxygen and nitrogen that will support flaming combustion of plastics. The measurement used is the minimum concentration of oxygen, expressed as a volume percent, and a mixture of oxygen and nitrogen I, ~2336~0 that will just support combustion of a material initially at room temperature. The minimum concentration of oxygen and the mixture of oxygen and nitrogen flowing up within a test column that will just support combustion is measured under equilibrium conditions of candle-like burning. The equilibrium is established by the relation between the heat generated from the combustion of the specimen and the heat loss to the surroundings is measured by one or the other to - 10 artibrary criteria, namely a time of burning of a length of burning of the specimen burned. This point is approached from both sides of the critical oxygen concentration in order to establish the oxygen index.
The copolymer used in Example 2 was found to have a limiting oxygen index of 54. It burned with low smoke and charred rather than dripped. One hundred percent of vinyl chloride has a limiting oxygen between 37 and 39. It chars upon burning. The copolymer of Comparative 2 has a limiting oxygen index of about 100 - 20 and melt drips upon burning. It is noted that when polyvinyl chloride uses a plasticizer, it smokes while it burns.
While exemplary embodiments of the' invention have been described, the true scope of the invention is to be determined from the following claims:
The copolymer used in the process of the present invention can be stabilized with an effective amount of stabilizers useful to stabilize polyvinyl chloride.
Such stabilizers include those referenced in the Background of the Invention as well as those listed in 1;~3.:~6~(~
Modern Plastics Encyclopedia 1979-1980 Vol. 56, No. loan pages 696 through 710.
Preferred stabilizes include organo-metal metallic stabilizers where the metal is selected from the group consisting of Cadmium, zinc, barium, calcium and mixtures thereof. The organic compound is preferably, an oxide, hydroxide, or fatty acid salt.
The stabilized copolymer is melt process according to the method of the present invention. In accordance with the present invention, the copolymer is heated to above its melting temperature. Preferably, it is heated to from 170C to 230C, and more preferably from 190C
to 200C.
The step of melt processing can be any useful method of melt processing thermoplastic materials.
Typical melt processes which can be used in accordance with the method of the present invention are disclosed in Modern Plastics Encyclopedia 1973-80, Vol. 56, No.
loan pages 247, 248, 265, 308, 332 and 381.
2 These include extrusion coating and laminating, compression molding, extrusion, lamination to form film, rotational molding and other types of molding such as injection molding. Preferred embodiments of melt processing include extrude processing, roll mill processing, and melt coating preferably by extrusion coating, and laminating. A
particularly preferred use of the process of the present invention is melt coating the copolymer onto a substrate, such as a wire.
The present invention is useful to form a coated substrate, preferably a coated wire comprising a wire, and a melt coating on the wire. The melt coating comprises the stabilized copolymer as noted above which contains 70 to 95 percent by weight by vinyl chloride and 5 to 35 percent by weight of chlorotrifluoroethy-tone. The wire can be any wire known in the art which can be coated according to the process of the present invention. Typically, the wires are made of copper, ,, .
lZ3~
aluminum, steel, and associated alloys. The wires can be of any thickness which can be coated. The wires can be primary wires or a coating jacket such as a plenum jacket covering a bundle of primary wires. The coating is applied by suitable melt coating technique. A
preferred coating method is using an extrude to melt the copolymer and coat the wire with a cross-head die.
The thickness of the coating on the wire can be as thick as can be made by known wire coating methods.
10 Typically, primary wire is coated to a thickness of from 4-15 miss and preferably 7 to 10 miss, and plenum jacket coating thickness can range from 10 to 40 miss.
Several examples are set forth below to illustrate the nature of the invention and the manner of carrying it out. However, the invention should not be considered as being limited to details thereof.
EXAMPLES
-About 400 grams of vinyl chloride chlorotrifluoro-ethylene copolymers was made in accordance with the 20 procedures disclosed in U.S. Serial No. 474,371, filed March 11, 1983. The copolymer had between 15 to 20 percent by weight of chlorotrifl~oroethylene and correspondingly between 80 and 85 percent of vinyl chloride.
- The above copolymer was heated to 195C. The copolymer discolored immediately and became dark black char after 10 minutes.
One hundred grams of the above copolymer was combined with 1.5 grams of Veiniest HA vinyl stabilizer which is believed to be a barrium/cadmium soap and one gram of calcium Stewart. This composition was extruded into a rod form by a plunger extrude at 195C. The composition was extrudable but had poor thermos stability. The composition darkened in color during the extrusion process.
EYE
Three hundred grams of a composition comprising 100 parts by weight of the above-recited copolymer 2.5 parts by weight of the HA stabilizer, 1.0 parts by weight of calcium Stewart, and additionally 1.5 parts by weight of Mark 5050 pentaerythrityl/phosphite stabilizer was added and 1.0 parts of Drape 10.4 epoxy plasticizer was also used. Drape 10.4 although called an epoxy plasticizer is used as a stabilizer in the composition of this Example. Argus Product Data Sheet 12/79-10.4, Drape 10.4 describes Drape 10.4 epoxy plasticizer as, "designed specifically to provide non-toxic compounds with optimum heat stabilizing action . . . ." This composition was extruded through a Hake one inch single screw extrude having an L/Dra~io of 24. The extrude was operated at Zone 1-160C, Zone 2-170C, Zone 3-180C and die at 190C. The extrude was operated at 15 to 25 rum. The extradite appeared to have good neological properties although it had some degradation including bubbles and poor color.
COMPARATIVE_ Example 2 was repeated using Firestone Corp. FC-461 vinyl chloride/chlorotrifluoroethylene copolymer containing 40 percent by weight vinyl chloride and 60 percent by weight chlorotrifluoroethylene. The extrusion conditions were the same but the extrude was run as 50 to 60 rum. The extradite had slight degradation and bubbles but appeared to have good theological properties.
The copolymer from Example 2 and Comparative 2 were tested in accordance with the Limiting Oxygen Index test, ASTM standard D-28~3-77. This method provides for measuring of the minimum concentrations of oxygen and a flowing mixture of oxygen and nitrogen that will support flaming combustion of plastics. The measurement used is the minimum concentration of oxygen, expressed as a volume percent, and a mixture of oxygen and nitrogen I, ~2336~0 that will just support combustion of a material initially at room temperature. The minimum concentration of oxygen and the mixture of oxygen and nitrogen flowing up within a test column that will just support combustion is measured under equilibrium conditions of candle-like burning. The equilibrium is established by the relation between the heat generated from the combustion of the specimen and the heat loss to the surroundings is measured by one or the other to - 10 artibrary criteria, namely a time of burning of a length of burning of the specimen burned. This point is approached from both sides of the critical oxygen concentration in order to establish the oxygen index.
The copolymer used in Example 2 was found to have a limiting oxygen index of 54. It burned with low smoke and charred rather than dripped. One hundred percent of vinyl chloride has a limiting oxygen between 37 and 39. It chars upon burning. The copolymer of Comparative 2 has a limiting oxygen index of about 100 - 20 and melt drips upon burning. It is noted that when polyvinyl chloride uses a plasticizer, it smokes while it burns.
While exemplary embodiments of the' invention have been described, the true scope of the invention is to be determined from the following claims:
Claims (2)
1. A coated wire comprising:
a wire; and a melt coating on the wire comprising a copolymer of 70 to 95 percent by weight of vinyl chloride and 5 to 30 percent by weight of chlorotrifluoroethylene.
a wire; and a melt coating on the wire comprising a copolymer of 70 to 95 percent by weight of vinyl chloride and 5 to 30 percent by weight of chlorotrifluoroethylene.
2. The coated wire of claim 1 wherein the copolymer chars when it burns.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56459883A | 1983-12-22 | 1983-12-22 | |
| US564,598 | 1983-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1233610A true CA1233610A (en) | 1988-03-08 |
Family
ID=24255144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000468282A Expired CA1233610A (en) | 1983-12-22 | 1984-11-21 | Method of melt processing and article made of a stabilized copolymer of vinyl chloride and chlorotrifluoroethylene |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS60155211A (en) |
| CA (1) | CA1233610A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0645086U (en) * | 1991-04-29 | 1994-06-14 | マン ソク キム | Insect screen device |
-
1984
- 1984-11-21 CA CA000468282A patent/CA1233610A/en not_active Expired
- 1984-12-21 JP JP59270554A patent/JPS60155211A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60155211A (en) | 1985-08-15 |
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