Polymers containing diester units

<IMAGE> (I)Polymers are different by the fact, that the diester blocks described by the formula (I) where R<1> and R<2> each is a hydrogen atom or single-valence water group and R<1> and R<2> together form an organic double-valence group attached to the carbon under a condition when these blocks are attached to carbon atoms by both ends and polymers are olefins, the polymers are being biodegraded and/or increase in water and are related to biologically active or diagnostic agent.