USING ZINC DERIVATIVES AS CATALYSTS IN POLYMERIZATION OF CYCLIC ESTERS Russian patent published in 2007 - IPC C08G63/82 B01J23/06 

FIELD: organic chemistry, chemical technology, catalysts.

SUBSTANCE: invention relates to using zinc derivatives of the general formula (I): wherein L₁ represents group of formulas: -E₁₅(R₁₅)(R₁₅ ^') or -E₁₆(R₁₆) wherein E represents nitrogen atom; L₂ and L₃ represent independently group of the formula: -E₁₄(R₁₄)(R₁₄ ^')(R₁₄ ^'') wherein E₁₄ represent carbon or silicon atom; E₁₅ represent nitrogen atom; E₁₆ represents oxygen atom; R₁₄, R₁₄ ^', R₁₄ ^'', R₁₅, R₁₅ ^' and R₁₆ represent independently hydrogen atom, (C₁-C₆)-alkyl, phenyl or radical of the formula -E₁₄ ^'RR'R'' wherein E₁₄ ^' represents carbon or silicon atom; R, R' and R'' represent independently hydrogen atom or (C₁-C₆)-alkyl as catalysts in the (co)polymerization reaction of cyclic esters. Also, invention proposes a method for synthesis of block-copolymers or static copolymers or polymers involving simultaneous addition of one or some monomers chosen from cyclic esters, a polymerization catalyst, a growth chain initiating agent and optionally additives. A growth chain initiating agent and a polymerization catalyst are represented by a single compound of the general formula (I) given above. The claimed invention provides carrying out the homogenous polymerization process resulting to yield of a substance with regulated indices.

EFFECT: valuable properties of catalysts, improved method of synthesis.

8 cl, 7 ex