Claims
- 1. A molecularly oriented pipe that is flexible and ductile after orienting comprised of an essentially amorphous phenylene sulfide/biphenylene sulfide copolymer.
- 2. A pipe in accordance with claim 1, wherein the copolymer is made from monomers comprising para-dichlorobenzene, 4,4-dibromobiphenyl and 1,2,4-trichlorobenzene.
- 3. A pipe in accordance with claim 2, wherein said 4,4-dibromobiphenyl is present during polymerization in an amount in the range of from about 1 to about 15 mole percent based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge.
- 4. A pipe in accordance with claim 2, wherein said 4,4'-dibromobiphenyl is present during polymerization in an amount in the range of from about 3 to about 10 mole percent based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge.
- 5. A pipe in accordance with claim 2, wherein said 4,4'-dibromobiphenyl is present during polymerization in an amount of in the range of from about 4 to about 8 mole percent based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge and wherein said 1,2,4-trichlorobenzene is present during polymerization in an amount in the range of from about 0.2 to about 0.4 mole percent based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge.
- 6. A pipe in accordance with claim 2, wherein said 1,2,4-trichlorobenzene is present during polymerization in an amount in the range of from about 0.05 to about 0.8 mole percent based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge.
- 7. A pipe in accordance with claim 1, wherein said pipe is biaxially oriented.
- 8. A pipe in accordance with claim 1, wherein the pipe has a wall thickness of in the range of from about 2 to about 6 min.
- 9. An oriented pipe produced from amorphous pipe having a wall thickness in the range of from about 2 to about 6 mm and comprised of a phenylene sulfide/biphenylene sulfide copolymer made from monomers comprising in the range of from about 4 to about 8 mole percent 4,4'-dibromobiphenyl and in the range of about 0.2 to about 0.4 mole percent 1,2,4-trichlorobenzene based on the para-dichlorobenzene and 4,4'-dibromobiphenyl charge.
- 10. A pipe produced by a method which comprises:
- a) preparing a copolymer of phenylene sulfide and biphenylene sulfide;
- b) forming said copolymer into essentially amorphous pipe by extrusion followed by rapid and uniform quench to avoid pipe crystallization; and
- c) drawing said pipe uniaxially by subsequent die extrusion.
- 11. A pipe produced by a method comprising:
- a) pelletizing a phenylene sulfide/biphenylene sulfide copolymer by first extrusion means operated at temperatures in the range of from about 300.degree. C. to about 320.degree. C.;
- b) drying the thus pelletized copolymer;
- c) forming the thus dried, pelletized copolymer into essentially amorphous pipe by second extrusion means operated at temperatures in the range of from about 300.degree. C. to about 310.degree. C. followed by rapid and uniform quench to avoid pipe crystallization; and
- d) orienting the thus formed essentially amorphous pipe by subsequent die extrusion by third extrusion means operated at temperatures in the range of from about 85.degree. C. to about 110.degree. C., wherein the subsequent extrusion is performed with a pipe pulloff rate in the range of from about 0.5 centimeters/minutes to about 50 centimeters/minute with a longitudinal draw ratio in the range of about 2 X to about 7 X and a transverse draw ratio in time range of about 2 X to about 3 X.
Parent Case Info
This application is a division of application Ser. No. 07/556,685, now allowed U.S. Pat. No. 5,151,235.
US Referenced Citations (4)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 287 396 A2 |
Oct 1988 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
556685 |
Jul 1990 |
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