1. An inflator for inflating an air bag, comprising:
an inflator housing having an opening portion at one end thereof;
a diffuser portion attached to the opening portion of the inflator housing and provided with at least one gas discharging port, a ratio (A1A2) of a total area (A1) of the at least one gas discharging port and an area (A2) of the opening portion being equal to or greater than 0.015 and equal to or smaller than 1; and
a pressurized medium contained in the inflator housing, the pressurized medium consisting mainly of a mixture of helium and argon, and a coefficient of viscosity of the pressurized medium being 25 to 40 \u03bcPas at 50 MPa and at 300\xb0 K.
2. An inflator according to claim 1, wherein sound velocity of the pressurized medium is 400 to 800 ms at 23\xb0 C.
3. An inflator according to claim 1, wherein, when a tank test is conducted such that, after the inflator charged with the pressurized medium under pressure of 50,000 kPa and having 33 mm2 of a total opening area of the at least one gas discharging port is inserted into a tank having a single hole with a diameter of 6 mm and an inner volume of 28.3 liters, the inflator is activated to discharge the pressurized medium to measure a pressure change inside a tank, the pressure reduction amount of a tank internal pressure at 0.5 seconds after the activation of the inflator becomes not more than 25%.
4. The inflator according to claim 3, wherein the tank internal pressure does not become 0 kPa until four seconds elapse from activation of the inflator.
5. An inflator according to claim 1, further comprising:
a rupturable plate closing the flow passage of the pressurized medium between the opening portion of the inflator housing and diffuser portion; and
rupturing means for rupturing the rupturable plate.
6. An air bag apparatus, comprising:
activation signal-outputting means including an impact sensor and a control unit;
a module case accommodating an inflator according to claim 1; and
an air bag.
7. An air bag apparatus, comprising:
activation signal-outputting means including an impact sensor and a control unit;
a module case accommodating an inflator according to claim 5; and
an air bag.
8. An inflator according to claim 1, wherein the ratio is smaller than 1.
9. An inflator according to claim 1, wherein the ratio is smaller than 0.95.
10. An inflator according to claim 1, wherein the ratio is smaller than 0.85.
11. An inflator according to claim 1, wherein a ratio (helium:argon) of the mixture of the pressurized medium is in a range of 3:7 to 7:3 by molar ratio.
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 resin composition consisting essentially of a polymer which is the reaction product of the polymerization reaction between dicyclopentadiene and limonene, said resin having a softening point ranging from about 50 to about 220 C. and a molecular weight ranging from about 500 to about 42,000.
2. A resin composition comprising a blend of two or more resins, wherein each resin consists essentially of the polymer which is the reaction product of the polymerization reaction between dicyclopentadiene and limonene and each resin has a is softening point ranging from about 50 to about 220 C. and a molecular weight ranging from about 500 to about 42,000.
3. The resin composition of claim 1 wherein the blend comprises four individual resins.
4. The resin composition of claim 2 wherein said blend comprises three individual resins.
5. The resin composition of claim 1 wherein said composition consists essentially of the polymerization reaction product of from about 10 to about 1 moles of dicyclopentadiene and from about 1 to about 10 moles of limonene.
6. The resin composition of claim 2 wherein each resin is the polymerization reaction product of from about 1 to about 2 moles of dicyclopentadiene and from about 2 to about 1 moles of limonene.
7. The resin composition of claim 3 wherein the first resin has a softening point ranging from about 55 to about 75 C., the second resin has a softening point ranging from about 80 to about 131 C., the third resin has a softening point ranging from about 126 to about 168 C., and the fourth resin has a softening point ranging from about 168 to about 195 C.
8. The resin composition of claim 4 wherein the first resin has a softening point ranging from about 134 to about 156 C., the second resin has a softening point ranging from about 138 to about 180 C., and the third resin has a softening point ranging from about 188 to about 208 C.
9. The resin composition of claim 3 wherein the first resin has a molecular weight ranging from about 500 to about 15,000, the second resin has a molecular weight ranging from about 700 to about 15,000, the third resin has a molecular weight ranging from about 3,000 to about 15,000, and the fourth resin has a molecular weight ranging from about 4,000 to about 15,000.
10. The resin composition of claim 4 wherein the first resin has a molecular weight ranging from about 700 to about 24,000, the second resin has a molecular weight ranging from about 700 to about 36,000, and the third resin has a molecular weight ranging from about 700 to about 42,000.
11. The resin composition of claim 1 wherein said polymerization is conducted in the presence of a catalyst.
12. The resin composition of claim 11 wherein said catalyst is selected from the group consisting of H2SO4, HCl, H3PO4, HClO4, BF3, BCl3, AlCl3, AlBr3, SnCl4, ZnCl2, SbCl3, and etherates of said acid catalyst.
13. The resin composition of claim 1 wherein said polymerization is a thermal polymerization.
14. A rubber stock comprising (1) a rubber selected from the group consisting of natural rubber, rubbers derived from a diene monomer or mixtures thereof, and (2) a polymeric resin composition consisting essentially of the reaction product of the polymerization between dicyclopentadiene and limonene, said resin having a softening point ranging from about 50 to about 220 C., and an average molecular weight ranging from about 500 to about 42,000.
15. The rubber stock of claim 14 wherein said rubber derived from a diene monomer or mixtures thereof is selected from the group comprising natural rubber, polyisoprene, polybutadiene, polychloroprene, copolymers of isoprene and butadiene, copolymers of styrene and butadiene, copolymers of acrylonitrile and butadiene, copolymers of acrylonitrile and isoprene and blends thereof.
16. The rubber stock of claim 14 wherein said polymeric resin composition is present in an amount ranging from about 5 to about 50 parts per hundred parts of rubber.
17. The rubber stock of claim 16 wherein said polymeric resin composition is present in an amount ranging from about 10 to about 25 parts per hundred parts of rubber.
18. The rubber stock of claim 14 wherein the resin composition comprises a blend of four individual resins.
19. The rubber stock of claim 14 wherein said resin composition comprises a blend of three individual resins.
20. The rubber stock of claim 18 wherein the first resin has a softening point ranging from about 55 to about 75 C., the second resin has a softening point ranging from about 80 to about 131 C., the third resin has a softening point ranging from about 126 to about 168 C., and the fourth resin has a softening point ranging from about 168 to about 195 C.
21. The rubber stock of claim 19 wherein the first resin has a softening point ranging from about 135 to about 156 C., the second resin has a softening point ranging from about 138 to about 180 C., and the third resin has a softening point ranging from about 188 to about 208 C.
22. The rubber stock of claim 18 wherein the first resin has a molecular weight ranging from about 500 to about 15,000, the second resin has a molecular weight ranging from about 700 to about 15,000, the third resin has a molecular weight ranging from about 3,000 to about 15,000, and the fourth resin has a molecular weight ranging from about 4,000 to about 15,000.
23. The rubber stock of claim 19 wherein the first resin has a molecular weight ranging from about 700 to about 24,000, the second resin has a molecular weight ranging from about 700 to about 36,000, and the third resin has a molecular weight ranging from about 700 to about 42,000.
24. A pneumatic tire having a tread comprised of (1) a rubber selected from the group consisting of natural rubber, rubbers derived from a diene monomer or mixtures thereof, and (2) a polymeric resin composition consisting essentially of the reaction product of the polymerization between dicyclopentadiene and limonene, said resin having a softening point ranging from about 50 to about 220 C., and an average molecular weight ranging from about 500 to about 42,000.
25. The pneumatic tire of claim 24 wherein said rubber derived from a diene monomer or mixtures thereof is selected from the group comprising natural rubber, polyisoprene, polybutadiene, polychloroprene, copolymers of isoprene and butadiene, copolymers of styrene and butadiene, copolymers of acrylonitrile and butadiene, copolymers of acrylonitrile and isoprene and blends thereof.
26. The pneumatic tire of claim 24 wherein said polymeric resin composition is present in an amount ranging from about 5 to about 50 parts per hundred parts of rubber.
27. The pneumatic tire of claim 26 wherein said polymeric resin composition is present in an amount ranging from about 10 to about 25 parts per hundred parts of rubber.
28. The pneumatic tire of claim 24 wherein the resin composition comprises a blend of four individual resins.
29. The pneumatic tire of claim 24 wherein said resin composition comprises a blend of three individual resins.
30. The pneumatic tire of claim 28 wherein the first resin has a softening point ranging from about 55 to about 75 C., the second resin has a softening point ranging from about 80 to about 131 C., the third resin has a softening point ranging from about 126 to about 168 C., and the fourth resin has a softening point ranging from about 168 to about 195 C.
31. The pneumatic tire of claim 29 wherein the first resin has a softening point ranging from about 135 to about 156 C., the second resin has a softening point ranging from about 138 to about 180 C., and the third resin has a softening point ranging from about 188 to about 208 C.
32. The pneumatic tire of claim 28 wherein the first resin has a molecular weight ranging from about 500 to about 15,000, the second resin has a molecular weight ranging from about 700 to about 15,000, the third resin has a molecular weight ranging from about 3,000 to about 15,000, and the fourth resin has a molecular weight ranging from about 4,000 to about 15,000.
33. The pneumatic tire of claim 29 wherein the first resin has a molecular weight ranging from about 700 to about 24,000, the second resin has a molecular weight ranging from about 700 to about 36,000, and the third resin has a molecular weight ranging from about 700 to about 42,000.