US 10,501,610 B2 · Method for preparing styrene-butadiene rubber and styrene-butadiene rubber

Abstract

The present invention relates to a method for preparing styrene-butadiene rubber in which a molecular weight modifier containing two or more components is used in a polymerization reaction and each of the two or more components is added at a optimal time, and the method is capable of improving physical properties of the prepared styrene-butadiene rubber, and styrene-butadiene rubber prepared thereby. The styrene-butadiene rubber prepared according to the preparation method of the present invention has improvement in characteristics such as tensile strength, elongation, etc., and thus may be usefully used in the production of a tire having environmental friendliness, abrasion resistance, and the like.

Claims8

Dependent claims

A method for preparing styrene-butadiene rubber (SBR), the method comprising a polymerization in an emulsion state by using a composition including 1) a styrene-based monomer;

2) a butadiene-based monomer;
and 3) a molecular weight modifier comprising t-dodecylmercaptan and pentamethylheptanethiol (PMHT),
wherein the t-dodecylmercaptan and the pentamethylheptanethiol are included in a weight ratio of 70:30 to 95:5,
wherein the t-dodecylmercaptan is prepared from propene, and the pentamethylheptanethiol is prepared from isobutene,
the t-dodecylmercaptan is added to the polymerization before the pentamethylheptanethiol is added thereto, and
the pentamethylheptanethiol is added at the time when the polymerization exhibits a conversion rate of 10% to 55%.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/741,538Filed 28 Dec 2016

Priority

KR 10-2015-018767128 Dec 2015

Published

US 2018/0215902 A12 Aug 2018

Granted

10 Dec 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

C08L 9/06
Compositions of homopolymers or copolymers of conjugated diene hydrocarbons: copolymers with styrene
C08F 2/22
Aqueous medium: emulsion polymerisation
C08F 2/26
With the aid of emulsifying agents: anionic
C08F 2/38
Processes of polymerisation: polymerisation using regulators, e.g. chain terminating agents , e.g. telomerisation

Method for preparing styrene-butadiene rubber and styrene-butadiene rubber

Life of this patent

Method for preparing styrene-butadiene rubber and styrene-butadiene rubber

Life of this patent

Abstract

Claims8