Tire inner liner based on butyl rubber comprising a low content of carbon black and another additional filler
View Patent ↗A tire inner liner comprises a rubber composition comprising: an elastomeric matrix comprising at least 50 phr of one or more butyl rubbers, from 5 to 35 phr of carbon black, from 0 to less than 10 phr of a plasticizing agent, at least 5 phr of one or more additional fillers selected from reinforcing fillers other than carbon black, semi-reinforcing fillers and inert fillers, the total content of reinforcing fillers and of semi-reinforcing fillers in the rubber composition varying from 5 to 50 phr. The invention also relates to a tire comprising such a liner.
1. A tire inner liner comprising a rubber composition comprising:
an elastomeric matrix comprising at least 50 phr of one or more butyl rubbers;
from 5 to 35 phr of carbon black;
from 0 to less than 10 phr of a plasticizing agent; and
at least 5 phr of one or more additional fillers selected from the group consisting of reinforcing fillers other than carbon black, semi-reinforcing fillers and inert fillers, the total content of reinforcing and semi-reinforcing fillers being from 5 to 50 phr,
wherein the inert fillers are at a content of from 1 to 60 phr.
2. The tire inner liner according to claim 1 , wherein the one or more butyl rubbers are selected from the group consisting of isobutylene rubbers, isobutylene/isoprene copolymers, bromobutyl rubbers and chlorobutyl rubbers.
3. The tire inner liner according to claim 1 , wherein the content of the one or more butyl rubbers varies from 70 to 100 phr.
4. The tire inner liner according to claim 3 , wherein the content of the one or more butyl rubbers varies from 90 to 100 phr.
5. The inner liner according to claim 1 , wherein the elastomeric matrix comprises a blend of several butyl rubbers.
6. The inner liner according to claim 1 , wherein the elastomeric matrix consists of one or more butyl rubbers.
7. The inner liner according to claim 1 , wherein the content of carbon black varies from 15 to 30 phr.
8. The inner liner according to claim 7 , wherein the content of carbon black varies from 20 to 30 phr.
9. The inner liner according to claim 1 , wherein the one or more additional fillers comprise semi-reinforcing fillers at a content of from 0 to less than 35 phr.
10. The inner liner according to claim 9 , wherein the semi-reinforcing fillers are at a content of from 1 to less than 35 phr.
11. The inner liner according to claim 10 , wherein the semi-reinforcing fillers are at a content of from 1 to 20 phr.
12. The inner liner according to claim 9 , wherein the semi-reinforcing fillers is graphite.
13. The inner liner according to claim 12 , wherein the graphite is in lamellar form.
14. The inner liner according to claim 1 , wherein the inert fillers are at a content of from 1 to 45 phr.
15. The inner liner according to claim 14 , wherein the content of carbon black in the rubber composition is from 5 to 15 phr.
16. The inner liner according to claim 1 , wherein the inert fillers is chalk.
17. The inner liner according to claim 1 , wherein the plasticizing agent is selected from the group consisting of plasticizing oils and plasticizing resins.
18. The inner liner according to claim 1 , wherein the content of plasticizing agent is less than or equal to 6 phr.
19. A tire comprising an inner liner according to claim 1 .
20. A tire inner liner comprising a rubber composition comprising:
an elastomeric matrix comprising at least 50 phr of one or more butyl rubbers;
from 5 to 35 phr of carbon black;
from 0 to less than 10 phr of a plasticizing agent; and
at least 5 phr of one or more additional fillers selected from semi-reinforcing fillers and inert fillers, the total content of reinforcing fillers and semi-reinforcing fillers being from 5 to 50 phr,
wherein carbon black is the sole reinforcing filler, and
wherein the inert fillers are at a content of from 1 to 60 phr.
21. A tire comprising an inner liner according to claim 20 .