Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 10, pp. 1617−1623.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © V.P. Yudin, I.V. Pankov, V.N. Verezhnikov, Yu.K. Gusev, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86, No. 10,
Preparation of the Pigment Mixtures (“Masterbatches”)
Using Rubbers Li-PBR Synthesized by the Solution
V. P. Yudin
, I. V. Pankov
, V. N. Verezhnikov
, and Yu. K. Gusev
Synthetic Rubber Research Institute, Voronezh Branch of FGUP NIISK, Voronezh, Russia
Voronezh State University, Voronezh, Russia
Received April 9, 2013
Abstract—A method of liquid phase ﬁ lling by hydrophobized aerosil (white carbon) of the solution styrene-
butadiene rubbers SSBR of different structures for use in the tread rubbers in the production of “green” tires.
Surface modiﬁ cation of the silicic ﬁ ller was carried out in a hydrocarbon solvent environment by various silicon
and nitrogen-containing agents.
At present, in tire tread rubbers two types of rubbers
are utilized: polybutadiene and also styrene-butadiene
copolymer of high content of the butadiene (60%).
Actually, two types of polybutadiene: polybutadiene
with lithium- (Li-PBR) and niobium (Nd-PBR) organic
catalysts, can be used.
Rubbers for the producing the “green” tires are made
of a combination of the two rubbers Nd-PBR (20–30%)
and SSBR-2060 (70–80%).
According to the experimental data obtained by many
researchers, butadiene rubber synthesized by the solu-
tion polymerization in the presence of a catalyst based
on titanium or neodymium is inferior in several proper-
ties to Li-PBR synthesized in solution using the lithium
The solution rubbers Li-PBR are environmentally
cleaner relative to, for example, rubber of emulsion
polymerization, which possess up to 7% of impurities
of emulsiﬁ ers in the form of fatty or resin acids [1, 2].
The following advantages of the rubbers Li-PBR can
be noted relative to rubbes Nd-PBR.
(1) The narrow MWD (M
= 1.2–1.6), owing to
which a number of polymer terminal moieties of macro-
molecules are reduced, that decreases the friction losses.
2. The presence of the short terminal moieties of poly-
styrene in macromolecules imparts sufﬁ cient cohesive
strength to rubber mixture and increases adhesion of the
tread rubber to the wet asphalt.
3. The absence in the rubber of transition metals
increases the shelf life and performance of rubbers at
4. Rubber based of Li-PBR is not prone to crystalliza-
tion that increases their resistance to frost.
5. In molecule of Li-PBR silicon-containing functional
groups can be introduced thereby an interaction of rubber
with mineral ﬁ llers increases [3–5].
6. Rubber Li-PBR may be of a branched structure, and
at sufﬁ ciently high molecular weight it can be ﬁ lled with
environmentally clean oil “Norman” that increases resis-
tance to multiple strains and reduces the friction losses.
Properties of tire rubber are largely determined by the
properties of rubber, which underlies rubber compositions
possessing a set of visco-elastic and mechanical proper-
ties, which provide the necessary quality of the tires.
A ﬁ ller alongside with rubber is one of the major com-
ponents. The reinforcing ﬁ llers play the most important