Polish version
Drukuj

Hydrogenated block (SBS/SIS) copolymers

The presence of double bonds in block copolymers styrene-butadiene-styrene (SBS) and styrene-isoprene-styrene (SIS) renders them vulnerable to weather conditions. Hydrogenation of these bonds allows to obtain new plastics with participation of polyethylene (SBES) or polypropylene (SBPS) blocks, more resistant to chemical and weather factors and to low temperature.


A brief description of the process

The SBS / SIS copolymers hydrogenation reaction is performed in waterless and (favorably) oxygen-free conditions in cyclohexane, at temperature 100 °C under pressure of 10·105 Pa of hydrogen, in the presence of a catalytic system. After the reaction is completed, the polymer is precipitated from the solution with methanol and then it is filtered and dried to a constant mass.


Advantages of the technology offered

Due to very good properties, i.a. good resistance to weather factors and low temperature, hydrogenated block (SBS / SIS) copolymers find wide usage i.a. in glues, freezeproof shoe soles, as freezeproof modifiers for bituminous mixtures (including i.a. road and roof asphalts) and as cosmetics ingredients.


Equipment

  • pressure reactor fitted with a stirrer,
  • agitators,
  • dryer.


Advancement of proceedings

There have been defined optimal conditions to hydrogenate commercial SBS / SIS copolymers (KRATON® - Schell) on the laboratory scale (a 500 ml reactor).


Patentability

Patent PL 208147 (2010) „Method to hydrogenate block copolymers of styrene with butadiene and styrene with isoprene”.


Market competitiveness

Neither SBS / SIS nor hydrogenated forms of these copolymers are produced in Poland. SBS / SIS copolymers are however accessible on the international market and hydrogenated forms of SBS and SIS are produced by Shell and Repsol Companies.


Information

Prof. Wincenty Skupiński, D.Sc., Chem. Eng.

phone: + 48 22 568 21 83, fax: + 48 22 568 22 33