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US 12,729,289 B2Granted
Self-healing rubber comprising a poly(methacrylic) oligomer
AssigneeBridgestone Europe NV/SA
InventorsRaffaele Di Ronza, Yoshihiro Morishita, Alan Wemyss, Chaoying Wan
Life of this patent
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Abstract
The present invention relates to a rubber composition comprising a poly(methacrylic acid) oligomer, a process for preparing the rubber composition, a cured rubber composition, and a self-healing tire prepared by using the rubber composition. The invention further relates to an amphiphilic block copolymer, and a process for its preparation. The amphiphilic block copolymer can be used as compatibilizer in the preparation of the rubber composition.
Claims20
A process for preparing a rubber composition, comprising:
- (A) polymerizing methacrylic acid in the presence of a Co(II) complex as catalytic chain transfer agent, to obtain a poly(methacrylic acid) oligomer having a number average molecular weight (Mn) from 160 to 3200 g/mol and a dispersity of equal to or less than 4;
- and
- (B) blending the poly(methacrylic acid) oligomer with zinc oxide, a dienic rubber, sulfur, and a vulcanization accelerator, wherein the poly(methacrylic acid) oligomer is mixed with zinc oxide to obtain a Zn salt of the poly(methacrylic acid) oligomer, before blending with the dienic rubber, sulfur and vulcanization accelerator.
A process for preparing a rubber composition, comprising:
- (A) polymerizing methacrylic acid in the presence of a Co(II) complex as catalytic chain transfer agent, to obtain a poly(methacrylic acid) oligomer having a number average molecular weight (Mn) from 160 to 3200 g/mol and a dispersity Ð of equal to or less than 4;
- and
- (B) blending the poly(methacrylic acid) oligomer with zinc oxide, a dienic rubber, sulfur, and a vulcanization accelerator, wherein additionally an amphiphilic block copolymer compatibilizer is used, wherein the amphiphilic block copolymer compatibilizer comprises at least a poly(methacrylic acid) block and an aliphatic carbon chain block, wherein both blocks are connected via a sulfide linkage.
Dependencies are inferred from the claim text.