US 9,803,031 B2 · Modified polymer, rubber composition and pneumatic tire

Abstract

The purpose of the present invention is to provide a modified polymer that significantly reduces heat build-up due to the modification when the modified polymer is formed into a rubber composition, a rubber composition containing the modified polymer, and a pneumatic tire in which the rubber composition is used. The modified polymer of the present invention is a modified polymer obtained by modifying a styrene-conjugated diene copolymer (A) with a nitrone compound (B). In the modified polymer, the content of styrene units in the styrene-conjugated diene copolymer (A) is 10% by mass or greater, and the proportion of vinyl bonds among all the double bonds contained in the styrene-conjugated diene copolymer (A) is 5 mol % or greater.

Claims13

Dependent claims

A modified polymer obtained by modifying a styrene-conjugated diene copolymer (A) with a nitrone compound (B),

the modified polymer having a five-membered ring structure represented by formula (4) or (5), represented by the formula:
which is formed by a cycloaddition reaction between a double bond of the styrene-conjugated diene copolymer (A) and a nitrone group of the nitrone compound (B);
a content of styrene units in the styrene-conjugated diene copolymer (A) being 10% by mass or greater;
a proportion of vinyl bonds among all the double bonds contained in the styrene-conjugated diene copolymer (A) being 5 mol % or greater;
and
wherein the nitrone compound (B) has a carboxy group.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/115,171Filed 22 Dec 2014

Priority

JP 2014-01676331 Jan 2014

Published

US 2016/0340446 A124 Nov 2016

Granted

31 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification19 codes

C08C 19/22
Chemical modification of rubber: incorporating nitrogen atoms into the molecule
B60C 1/0016
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the tread
C07C 251/48
With oxygen atoms of oxyimino groups bound to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals: with the carbon atom of at…
C07D 213/53
Radicals substituted by doubly-bound oxygen, sulfur, or nitrogen atoms, or by two such atoms singly-bound to the same carbon atom: nitrogen atoms

Modified polymer, rubber composition and pneumatic tire

Life of this patent

Modified polymer, rubber composition and pneumatic tire

Life of this patent

Abstract

Claims13