RUBBER COMPOSITION COMPRISING A BLOCKED MERCAPTOSILANE COUPLING AGENT

摘要

A rubber composition, devoid of zinc or comprising less than 0.5 phr of zinc and devoid of guanidine derivatives or comprising less than 0.5 phr of guanidine derivatives, based on at least one diene elastomer, one inorganic filler as reinforcing filler and one blocked mercaptosilane corresponding to the formula:;(R2O)aR1(3-a)Si—Z—S—C(═O)-Awherein:
R1, which are identical or different, each represent a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms;R2, which are identical or different, each represent hydrogen or a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms;A represents hydrogen or a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms and linear or branched alkoxyalkyls having from 2 to 8 carbon atoms;Z represents a divalent bonding group comprising from 1 to 18 carbon atoms;a is an integer equal to 1, 2 or 3.

主权项

1) A rubber composition, devoid of zinc or comprising less than 0.5 part per hundred parts of elastomer, phr, of zinc and devoid of guanidine derivatives or comprising less than or 0.5 phr of guanidine derivatives, based on at least one diene elastomer, one inorganic filler as reinforcing filler and one blocked mercaptosilane corresponding to the general formula (I):
(R2O)aR1(3-a)Si—Z—S—C(═O)-A wherein:
the symbols R1, which are identical or different, each represent a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms;the symbols R2, which are identical or different, each represent hydrogen or a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms;the symbol A represents hydrogen or a monovalent hydrocarbon group chosen from linear or branched alkyls, cycloalkyls or aryls having from 1 to 18 carbon atoms and linear or branched alkoxyalkyls having from 2 to 8 carbon atoms;the symbol Z represents a divalent bonding group comprising from 1 to 18 carbon atoms;a is an integer equal to 1, 2 or 3.