WAY OF PRODUCTION OF MODIFIED 1,4-CIS-POLYBUTADIENE Russian patent published in 2012 - IPC C08F136/06 C08C19/00 C08C19/28 C08F2/44 

FIELD: rubber industry.

SUBSTANCE: invention refers to production of modified cis-1,4-polybutadiene with the presence of the Ziegler-Natta catalyst systems; the obtained polymer is used in manufacturing of general mechanical rubber goods, tyres with good operational characteristics. The way of production is performed by means of butadiene polymerization in the hydrocarbon solvent with the presence of the neodymium-containing catalyst with further addition of a modifier and antioxidant, extraction and drying of the polymer; as a modifier, low molecular non-saturated polyketones are used that contain from 0.1 to 16 weight % of oxygen in the form of carbonyl group and double carbon-carbon bonds; the number average molecular weight of the polyketones is from 5,500 to 15,000; the polyketones are introduced into the polymerizate in the course of monomer conversion that equal or exceed 95 % in the amount from 1 to 40 mmol/kg of butadiene (0.2-12.0 g/kg of butadiene) that goes to polymerization at continuous mixing within 15-60 min. at the temperature of 55-85°C; as a neodymium catalyst, neodymium ethylhexylphosphate or neodymium versatat is used; after the modification process has been completed, the antioxidant in the amount of 4-5g/kg of the ploymer is used.

EFFECT: production of cis-1,4-polybutadiene with the Mooney viscosity of 40-50 n. units, with narrow MMD (<2.5), low cold flow (<25 mm/hour) and improved characteristics of vulcanizing agents.

4 cl, 2 tbl, 16 ex