Laminated body of rubber layers
A laminated body of rubber layers includes: a resin layer formed from a polyester resin or a polyamide resin; a rubber layer formed from a rubber composition containing a diene rubber; and an adhesive layer disposed between the resin layer and the rubber layer. The adhesive rubber composition contains a modified rubber composition (A) or a modified rubber composition (B) both having a number average molecular weight of 70,000 to 110,000. The modified rubber composition (A) is formed from a modified butyl rubber (1) formed by reacting, with a butyl rubber, a compound having in a molecule a nitroxide free radical that is stable at ambient temperature in the presence of oxygen, a radical initiator, and a co-crosslinking agent. The modified rubber composition (B) is formed by compounding the co-crosslinking agent with a modified butyl rubber (2) formed by reacting the compound and the radical initiator with the butyl rubber.
1. A pneumatic tire comprising a laminated body of rubber layers including:
a resin layer formed from a polyester resin or a polyamide resin;
a rubber layer formed from a rubber composition containing a diene rubber; and
an adhesive layer formed from an adhesive rubber composition and being disposed between the resin layer and the rubber layer;
the adhesive rubber composition containing a modified rubber composition (A) having a number average molecular weight of 70,000 to 110,000;
the modified rubber composition (A) being formed from a modified butyl rubber (1) formed by reacting, with a butyl rubber, a compound (a) having in a molecule a nitroxide free radical that is stable at ambient temperature in the presence of oxygen, a radical initiator (b), and a co-crosslinking agent (c); and
wherein the adhesive rubber composition further comprises a resin crosslinking agent selected from the group consisting of alkylphenol-formaldehyde resin, melamine-formaldehyde condensation product, and triazine-formaldehyde condensation product.
2. The pneumatic tire according to claim 1 , wherein the modified rubber composition (A) has a Mooney viscosity (ML 1+4 /100° C.) in accordance with JIS K6300 of 30 to 55.
3. A pneumatic tire comprising a laminated body of rubber layers comprising:
a resin layer formed from a polyester resin or a polyamide resin;
a rubber layer formed from a rubber composition containing a diene rubber; and
an adhesive layer formed from an adhesive rubber composition and being disposed between the resin layer and the rubber layer;
the adhesive rubber composition containing a modified rubber composition (A) or a modified rubber composition (B) both having a number average molecular weight of 70,000 to 110,000 and a compounded amount of resin crosslinking agent and peroxide;
the modified rubber composition (A) being formed from a modified butyl rubber (1) formed by reacting, with a butyl rubber, a compound (a) having in a molecule a nitroxide free radical that is stable at ambient temperature in the presence of oxygen, a radical initiator (b), and a co-crosslinking agent (c); and
the modified rubber composition (B) being formed by compounding the co-crosslinking agent (c) with a modified butyl rubber (2) formed by reacting the compound (a) and the radical initiator (b) with the butyl rubber; and
and the compounded resin crosslinking agent includes a resin crosslinker which is at least one of alkylphenol-formaldehyde resin, melamine-formaldehyde condensation product, and triazine-formaldehyde condensation product.
4. The pneumatic tire according to claim 3 , wherein the modified rubber composition (A) and the modified rubber composition (B) have a Mooney viscosity (ML 1+4 /100° C.) in accordance with JIS K6300 of 30 to 55.