Rubber compositions with high fluidity levels based on aromatic aldehydes and aromatic polyphenols

Abstract

The invention relates to a rubber composition comprising at least one phenolic resin based on: at least one aromatic polyphenol comprising at least one compound bearing at least two - The aromatic nucleus of the O-H group, at least one of the two ortho-O-H groups is unsubstituted; and at least one aldehyde of formula (W), wherein: Ar 1 and Ar 2 The groups are all independently of each other optionally substituted aromatic nuclei; and SP is at least Ar 1 and Ar 2 A linking group where the groups are connected to each other, SP connects Ar to Ar through at least two covalent bonds 1 and Ar 2 groups separated.

Description

technical field [0001] The present invention relates to rubber compositions, methods for preparing these compositions, rubber compounds and tires. Background technique [0002] It is known to use in some components of tires rubber compositions having high stiffness during small strains of the tire. Resistance to small strains is one of the properties a tire must have in order to respond to the stresses it is subjected to. [0003] High stiffnesses can be achieved using so-called concentrated vulcanization systems, ie containing in particular relatively high levels of sulfur and vulcanization accelerators. [0004] However, such concentrated cure systems adversely affect the uncured aging of the composition. Thus, when the composition is in the form of a semi-finished product such as a rubber strip, sulfur can migrate to the surface of the semi-finished product. This phenomenon known as blooming adversely affects the tackiness of the semi-finished products during their lon...

AI Technical Summary

Problems solved by technology

[0008] However, in a known manner, increasing the stiffness of the rubber composition by increasing the filler content may adversely affect the hysteresis properties and thus the rolling resistance properties of the tire

Images