High-performance tyre

Patent metadata

Field	Value
Publication number	US-10696824-B2
Application number	US-201715721520-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Apr 24, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A (iso-styrene/trans-butadiene): diene-terminated copolymer is described which includes (i) a polymeric block of styrene-butadiene consisting of a random sequence of butadiene in trans conformation and styrene in isotactic configuration, and (ii) a terminal polymeric block consisting of a sequence of one or more dienic monomers.

First claim

The invention claimed is:

1. A (iso-styrene/trans-butadiene): diene-terminated copolymer, wherein said copolymer consists in (i) a polymeric block of styrene-butadiene consisting of a random sequence of butadiene in trans conformation and styrene in isotactic configuration, and (ii) a terminal polymeric block consisting of a sequence of one or more dienic monomers.

2. A copolymer according to claim 1 , wherein said dienic monomer is selected from the group comprising isoprene, 1,4-pentadiene, 1,4-hexadiene, 1,5-hexadiene, cyclopentadiene, 1-vinyl-cyclopentene, 2-vinyl-cyclohexene, 4-vinyl-cyclohexene, and mixtures thereof.

3. A copolymer according to claim 2 , wherein said dienic monomer is selected from the group comprising isoprene, 1,4-hexadiene, cyclopentadiene, and mixtures thereof.

4. A copolymerization process of styrene and butadiene with one or more dienic monomers comprising (i) to prepare a solution of said one or more dienic monomers in a suitable solvent, (ii) to add to said solution a homogeneous catalytic system, and (iii) to add to said solution said styrene and butadiene, wherein said homogeneous catalytic system comprises a homogeneous catalyst having the following formula (I),

wherein
Tr is a transition metal,
X and X′, equal or different each other, are a halogen atom,
R1 and R2, equal or different each other, are a H atom or a linear or branched alkyl group having from 1 to 10 carbon atoms,
R3 to R6, equal or different each other, are a H atom or a linear or branched alkyl group having from 1 to 10 carbon atoms, or a linear or branched arylalkyl group having from 7 to 14 carbon atoms,
Y and Y′, equal or different each other, are an oxygen, sulphur, selenium or tellurium atom, or a NR7 or PR7 group,
D and D′, equal or different each other, are an oxygen, sulphur, selenium or tellurium atom, or a NR7 or PR7 group,
R 7 is a H atom or a linear or branched alkyl group having from 1 to 10 carbon atoms, and
n is an integer from 1 to 10,

and wherein said copolymerization process provides the formation of a (iso-styrene/trans-butadiene): diene-terminated copolymer, wherein said copolymer consists in (i) a polymeric block of styrene-butadiene consisting of a random sequence of butadiene in trans conformation and styrene in isotactic configuration, and (ii) a terminal polymeric block consisting of a sequence of one or more dienic monomers.

5. The copolymerization process according to claim 4 , wherein R4 and R6 are linked to the benzene ring in ortho position with respect to the D and D′ substituent, and R4 and R6 are represented by a linear or branched arylalkyl group having from 7 to 14 carbon atoms, and R3 and R5 are linked to the benzene ring in para position with respect to the D and D′ substituent, and R3 and R5 are represented by a hydrogen atom or a linear or branched alkyl group having from 1 to 10 carbon atoms.

6. The copolymerization process according to claim 4 , wherein said homogeneous catalyst is represented by the following formula (1):

Assignees

• Pirelli
• Milano Politecnico

Inventors

• Castellani Luca
• Hanel Thomas
• Albizzati Enrico
• Proto Antonio
• Capacchione Carmine
• Galimberti Maurizio

Classifications

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08F212/08

  Styrene · CPC title

• C08F297/08

  polymerising mono-olefins · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title