1. An oxygen-absorbing resin composition comprising a thermoplastic resin (A) having carbon-carbon double bonds substantially only in the main chain, a transition metal salt (B), and a transition metal compound (D);
wherein in the thermoplastic resin (A), each carbon-carbon double bond is separated by three or more methylenes; and
wherein the transition metal compound (D) is at least one metal compound selected from the group consisting of TiO2, V2O5, MoO3, CrO3, WO3, WO2, H2WO4, WCl2O2, WOCl4, and SeO2.
2. The resin composition of claim 1, wherein the thermoplastic resin (A) has a structural unit as represented by a formula (1):
wherein R1 and R2 are each independently a hydrogen atom, an alkyl group that may be substituted, an aryl group that may be substituted, an alkylaryl group that may be substituted, \u2014COOR3, \u2014OCOR4, a cyano group or a halogen atom, and R3 and R4 are each independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
3. The resin composition of claim 1, wherein the thermoplastic resin (A) is a ring-opening metathesis polymer of a cyclic olefin having 7 or more carbon atoms.
4. The resin composition of claim 1, wherein the thermoplastic resin (A) has a weight average molecular weight of 60000 or more.
5. The resin composition of claim 1, wherein a trans structural unit in the main chain of the thermoplastic resin (A) accounts for 40% or more and 90% or less of the total thermoplastic resin (A).
6. The resin composition of claim 1, wherein the thermoplastic resin (A) is polyoctenylene.
7. The resin composition of claim 1 further comprising an antioxidant (C).
8. The resin composition of claim 7, wherein the antioxidant (C) is contained in a ratio of 100 to 5000 ppm based on the weight of the thermoplastic resin (A).
9. The resin composition of claim 1, wherein the transition metal compound (D) is contained in a ratio of 50 to 50000 ppm in terms of metal element based on the weight of the thermoplastic resin (A).
10. The resin composition of claim 1, wherein the transition metal salt (B) is at least one metal salt selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt and a cobalt salt.
11. The resin composition of claim 10, wherein the transition metal salt (B) is contained in a ratio of 1 to 50000 ppm based on the weight of the thermoplastic resin (A).
12. The resin composition of claim 1 further comprising a matrix resin (E).
13. The resin composition of claim 12, wherein particles of the thermoplastic resin (A) are dispersed in a matrix of the matrix resin (E).
14. The resin composition of claim 12, wherein the average particle size of the particles of the thermoplastic resin (A) is 4 \u03bcm or less.
15. The resin composition of claim 12, wherein the thermoplastic resin (A) is contained in a ratio of 30 to 1 wt % and the matrix resin (E) is contained in a ratio of 70 to 99 wt %, when the total weight of the thermoplastic resin (A) and the matrix resin (E) is determined to be 100 wt %.
16. The resin composition of claim 12, wherein the matrix resin (E) is a gas barrier resin (E.1) having an oxygen transmission rate of 500 ml\xb720 \u03bcm(m2\xb7day\xb7atm) or less in 65% RH at 20\xb0 C.
17. The resin composition of claim 12, wherein the gas barrier resin (E.1) is at least one resin selected from the group consisting of a polyvinyl alcohol resin, a polyamide resin, a polyvinyl chloride resin and a polyacrylonitrile resin.
18. The resin composition of claim 17, wherein the gas barrier resin (E.1) is an ethylene-vinyl alcohol copolymer having an ethylene content of 5 to 60 mol % and a degree of saponification of 90% or more.
19. The resin composition of claim 12 further comprising a compatibilizer (F).
20. The resin composition of claim 19, wherein the thermoplastic resin (A) is contained in a ratio of 29.9 to 1 wt %, the matrix resin (E) is contained in a ratio of 70 to 98.9 wt %, and the compatibilizer (F) is contained in a ratio of 29 to 0.1 wt %, when the total weight of the thermoplastic resin (A), the matrix resin (E) and the compatibilizer (F) is determined to be 100 wt %.
21. A molded product comprising the resin composition of claim 1.
22. A multilayered structure comprising a layer made of the resin composition of claim 1.
23. A multilayered container comprising a layer made of the resin composition of claim 1.
24. The resin composition of claim 1, wherein thermoplastic resin (A) is capable of absorbing oxygen in an amount of 1.6 mols or more per 1 mol of carbon-carbon double bond.
25. The resin composition of claim 1, wherein the thermoplastic resin (A) contains an oligomer having a molecular weight of 1000 or less in a ratio of 6% by area or less in an analytical chart of gel permeation chromatography.
26. The resin composition of claim 25, wherein the thermoplastic resin (A) is prepared by removing the oligomer having a molecular weight of 1000 or less from the ring-opening metathesis polymer of a cyclic olefin having 7 or more carbon atoms.
27. The resin composition of claim 26, wherein the thermoplastic resin (A) is prepared by washing the ring-opening metathesis polymer of a cyclic olefin having 7 or more carbon atoms with a solvent that does not substantially dissolve the polymer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A turbine nozzle segment comprising:
a single hollow airfoil extending radially between radially outer and inner band segments,
the airfoil located between circumferentially spaced apart pressure and suction side edges of the radially outer and inner band segments,
the airfoil having an airfoil wall with pressure and suction sides extending axially between leading and trailing edges of the airfoil,
the airfoil wall surrounding a bifurcated cavity, and
a bifurcating rib extending through the bifurcated cavity and between the pressure and suction sides of the airfoil wall airfoil dividing the bifurcated cavity into forward and aft cavities.
2. A turbine nozzle segment as claimed in claim 1 further comprising at least one crossover hole through the bifurcating rib.
3. A turbine nozzle segment as claimed in claim 1 further comprising a stiffening rib extending radially outwardly from and along a radially outer surface of the outer band segment and extending axially and circumferentially from a pressure side forward corner of the outer band segment to the bifurcating rib.
4. A turbine nozzle segment as claimed in claim 3 wherein the stiffening rib is axially and circumferentially aligned with the bifurcating rib.
5. A turbine nozzle segment as claimed in claim 4 further comprising a number of crossover holes through the bifurcating rib wherein the one crossover hole is one of the plurality of crossover holes.
6. A turbine nozzle segment is claimed in claim 3 wherein the stiffening rib is aligned with a direction of resultant gas loads on the airfoil.
7. A turbine nozzle segment as claimed in claim 3 further comprising an airfoil fillet running around a junction between the airfoil and the outer band segment and an enlarged portion of the airfoil fillet where the bifurcating rib intersects the suction side of the airfoil.
8. A turbine nozzle segment as claimed in claim 7 wherein the stiffening rib is axially and circumferentially aligned with the bifurcating rib.
9. A turbine nozzle segment as claimed in claim 8 further comprising a number of crossover holes through the bifurcating rib wherein the one crossover hole is one of the plurality of crossover holes.
10. A turbine nozzle segment as claimed in claim 7 wherein the stiffening rib is aligned with a direction of resultant gas loads on the airfoil.
11. A turbine nozzle segment as claimed in claim 10 wherein the stiffening rib is axially and circumferentially aligned with the bifurcating rib.
12. A turbine nozzle segment as claimed in claim 11 further comprising a number of crossover holes through the bifurcating rib wherein the one crossover hole is one of the plurality of crossover holes.
13. A turbine nozzle segment as claimed in claim 3 wherein the hollow airfoil, the outer and inner band segments, the bifurcating rib, and the stiffening rib are integral and made from a unitary one-piece casting.
14. A turbine nozzle segment as claimed in claim 13 further comprising at number of crossover hole through the bifurcating rib.
15. A turbine nozzle segment as claimed in claim 14 wherein the stiffening rib is axially and circumferentially aligned with the bifurcating rib.
16. A turbine nozzle segment as claimed in claim 15 wherein the stiffening rib is aligned with a direction of resultant gas loads on the airfoil.
17. A turbine nozzle segment as claimed in claim 16 further comprising an airfoil fillet running around a junction between the airfoil and the outer band segment and an enlarged portion of the airfoil fillet where the bifurcating rib intersects the suction side of the airfoil.
18. A turbine nozzle segment as claimed in claim 3 wherein the stiffening rib and the bifurcating rib are substantially centered about a center plane that falls outside a wheelbase of the nozzle segment at an aft end of the outer band segment.
19. A turbine nozzle segment as claimed in claim 18 wherein the hollow airfoil, the outer and inner band segments, the bifurcating rib, and the stiffening rib are integral and made from a unitary one-piece casting.
20. A turbine nozzle segment as claimed in claim 19 further comprising at number of crossover hole through the bifurcating rib.
21. A turbine nozzle segment as claimed in claim 20 wherein the stiffening rib is axially and circumferentially aligned with the bifurcating rib.
22. A turbine nozzle segment as claimed in claim 21 wherein the stiffening rib is aligned with a direction of resultant gas loads on the airfoil.
23. A turbine nozzle segment as claimed in claim 22 further comprising an airfoil fillet running around a junction between the airfoil and the outer band segment and an enlarged portion of the airfoil fillet where the bifurcating rib intersects the suction side of the airfoil.