Polymer modified along the chain and process for the synthesis thereof
A polymer comprises randomly distributed units UA, UB, UC and UD and at least one unit bearing a subunit F according to the respective molar percentages m, n, o, p and f F pendant along the chain of the polymer and bearing an associative group comprising at least one nitrogen atom, R 1 and R 2 , which are identical or different, denoting a hydrogen atom, a methyl radical or a phenyl radical which is unsubstituted or substituted in the ortho, meta or para position by a methyl radical, m≥50, n≥0, o≥0, f>0, 0<0+p≤25, m, n, o, p and f ranging from 0 to 100, the respective molar percentages of m, n, o, p and f calculated based on the sum of m+n+o+p+f, which is equal to 100.
1. A polymer which comprises the following units UA, UB, UC and UD and at least one unit bearing a subunit F,
which units UA, UB, UC and UD are distributed randomly within the polymer
the subunit F being pendant along the chain of the polymer and bearing an associative group comprising at least one nitrogen atom,
the unit bearing the subunit F being present in the polymer chain according to a molar percentage of f %,
R 1 and R 2 , which are identical or different, denoting a hydrogen atom, a methyl radical or a phenyl radical which is unsubstituted or substituted in the ortho, meta or para position by a methyl radical,
m≥50
n≥0
o≥0
f>0
0<o+p≤25
m, n, o, p and f being numbers ranging from 0 to 100
the respective molar percentages of m, n, o, p and f being calculated on the basis of the sum of m+n+o+p+f, which is equal to 100, and which contains the following units UE distributed randomly within the polymer,
o+p+q≤10
q≥0
the respective molar percentages of m, n, o, p, q and f being calculated on the basis of the sum of m+n+o+p+q+f, which is equal to 100.
2. A polymer according to claim 1 , which contains the following units UF distributed randomly within the polymer,
R 3 denoting an alkyl radical having from 1 to 4 carbon atoms or an aryl radical,
0≤r≤25,
the respective molar percentages of m, n, o, p, q, r and f being calculated on the basis of the sum of m+n+o+p+q+r+f, which is equal to 100.
3. A polymer according to claim 1 , in which the percentages o is different from 0.
4. A polymer which comprises the following units UA, UB, UC and UD and at least one unit bearing a subunit F,
which units UA, UB, UC and UD are distributed randomly within the polymer
the subunit F being pendant along the chain of the polymer and bearing an associative group comprising at least one nitrogen atom,
the unit bearing the subunit F being present in the polymer chain according to a molar percentage of f %,
R 1 and R 2 , which are identical or different, denoting a hydrogen atom, a methyl radical or a phenyl radical which is unsubstituted or substituted in the ortho, meta or para position by a methyl radical,
m≥50
n≥0
o≥0
f>0
0<o+p≤25
m, n, o, p and f being numbers ranging from 0 to 100
the respective molar percentages of m, n, o, p and f being calculated on the basis of the sum of m+n+o+p+f, which is equal to 100, in which n and o are different from 0.
5. A polymer according to claim 1 , in which at least one of the two molar percentages p and q is not equal to 0.
6. A polymer which comprises the following units UA, UB, UC and UD and at least one unit bearing a subunit F,
which units UA, UB, UC and UD are distributed randomly within the polymer
the subunit F being pendant along the chain of the polymer and bearing an associative group comprising at least one nitrogen atom,
the unit bearing the subunit F being present in the polymer chain according to a molar percentage of f %,
R 1 and R 2 , which are identical or different, denoting a hydrogen atom, a methyl radical or a phenyl radical which is unsubstituted or substituted in the ortho, meta or para position by a methyl radical,
m≥50
n≥0
o≥0
f>0
0<o+p≤25
m, n, o, p and f being numbers ranging from 0 to 100
the respective molar percentages of m, n, o, p and f being calculated on the basis of the sum of m+n+o+p+f, which is equal to 100, which contains, as monomer units, only the units UA, UB, UC, UD and UE and the units bearing the subunit F according to their respective molar percentages m, n, o, p, q and f.
7. A polymer according to claim 1 , in which R 1 and R 2 are identical and denote a hydrogen atom.
8. A polymer according to claim 1 , in which f varies from 0.01 to 50%.
9. A polymer according to claim 1 , in which the associative group is selected from the group consisting of the imidazolidinyl, triazolyl, triazinyl, bis-ureyl and ureido-pyrimidyl groups.
10. A polymer according to claim 1 , in which the associative group corresponds to one of the following formulae (I) to (V):
where:
Ch denotes a carbon chain which can optionally contain heteroatoms,
* represents a direct or indirect connection to the chain of the polymer,
R denotes a hydrocarbon group which can optionally contain heteroatoms,
X denotes an oxygen or sulphur atom or an NH group.
11. A polymer according to claim 1 , in which the associative group corresponds to the formula (VI):
where * represents a direct or indirect connection to the chain of the polymer.
12. A polymer according to claim 1 , which is an elastomer.
13. A rubber composition which comprises a reinforcing filler and a polymer defined according to claim 12 .
14. A tire which comprises a rubber composition according to claim 13 .