The notched Izod impact toughness and tensile elongation of poly(lactic acid) (PLA)-homopolymers are increased by about 2 to about 4 times by blending therewith a PLA-copolymer having a difunctional flexible middle segment such as a polysiloxane or a polyether from about 0.6 wt. % to about 20 wt. %. The PLA-homopolymer-PLA-copolymer blend having a difunctional flexible polymer from about 0.5 wt. % to about 10 wt. % is thermally annealed to provide impact toughness of at least about 5 kJ/m.sup.2 and tensile elongation of greater than 12%. This exceptional improvement observed in the PLA blend is a synergistic effect of the addition of the difunctional flexible polymer of the copolymer and thermal annealing. The improvement observed in the mechanical properties with high PLA homopolymer content above about 90 to about 98 wt. % is unusual and results in an increased scope of molding and thermoforming applications. The annealed PLA-copolymers having a difunctional flexible middle segment have also been found to have improved notched Izod impact properties.

The invention relates to a polymer comprising: a) at least one polyether polyester copolymer segment, wherein the polyether polyester copolymer comprises ether units selected from the group consisting of the formula (II) —[CR.sup.1.sub.2].sub.n—O—, wherein n is an integer of 2 to 4, R.sup.1 represent independent of each other organic groups having 1 to 30 carbon atoms or hydrogen, and wherein in case n is equal to 2 at least one of the R.sup.1 represents an ether group having the formula —R.sup.2—O—R.sup.3, wherein R.sup.2 and R.sup.3 independent of each other represent organic groups having 1 to 30 carbon atoms, and b) at least one polysiloxane segment linked to the at least one polyether polyester copolymer segment.

The present invention is directed to bioresorbable polymers to be used as bone and tissue adhesives. The present invention is also directed to the synthesis of bioresorbable polymeric molecules bearing adhesive moieties and the use of such compounds in methods to glue and stabilize fractured bones and damaged tissues. The present invention is also directed to the use of such compounds as adhesive sealants for applications in wound care. The present invention is also directed to the use of such compounds as biodegradable ink for applications in tissue engineering and 3D printing. The present invention also relates to the use of such compounds as drug delivery platforms.

The present invention includes a diblock copolymer system that self-assembles at very low molecular weights to form very small features. In one embodiment, one polymer in the block copolymer contains silicon, and the other polymer is a polylactide. In one embodiment, the block copolymer is synthesized by a combination of anionic and ring opening polymerization reactions. In one embodiment, the purpose of this block copolymer is to form nanoporous materials that can be used as etch masks in lithographic patterning.

A silicone-polyester copolymer has the formula X.sub.g[Z.sub.jY.sub.o].sub.c, where each X is an independently selected silicone moiety having a particular structure, each Y is an independently selected polyester moiety, each Z is an independently selected siloxane moiety, subscript c is from 1 to 150, subscript g is >1, 0≤j<2, and 0<o<2, with the proviso that j+o=2 in each moiety indicated by subscript c. Methods of preparing the silicone-polyester copolymer are also disclosed. Further, a sealant is disclosed, the sealant comprising the silicone-polyester copolymer and a condensation-reaction catalyst.

The present invention is directed to bioresorbable polymers to be used as bone and tissue adhesives. The present invention is also directed to the synthesis of bioresorbable polymeric molecules bearing adhesive moieties and the use of such compounds in methods to glue and stabilize fractured bones and damaged tissues. The present invention is also directed to the use of such compounds as adhesive sealants for applications in wound care. The present invention is also directed to the use of such compounds as biodegradable ink for applications in tissue engineering and 3D printing. The present invention also relates to the use of such compounds as drug delivery platforms.

Provided are polysiloxane structure-containing rubber particles and composite particles having a high dispersibility and degradability; and production methods thereof. The rubber particles are comprised of a copolymer having a polyester structure and an organopolysiloxane structure, wherein the copolymer is a hydrosilylation crosslinked product of (A) a polyester having at least two aliphatic unsaturated groups per molecule; and (B) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms per molecule. The composite particles are those with the surfaces of these rubber particles being coated with polyorganosilsesquioxane or silica.

The invention relates to a polymer comprising: a) at least one polyether polyester copolymer segment, wherein the polyether polyester copolymer comprises ether units selected from the group consisting of the formula (II) —[CR.sup.1.sub.2].sub.n—O—, wherein n is an integer of 2 to 4, R.sup.1 represent independent of each other organic groups having 1 to 30 carbon atoms or hydrogen, and wherein in case n is equal to 2 at least one of the R.sup.1 represents an ether group having the formula —R.sup.2—O—R.sup.3, wherein R.sup.2 and R.sup.3 independent of each other represent organic groups having 1 to 30 carbon atoms, and b) at least one polysiloxane segment linked to the at least one polyether polyester copolymer segment.

The notched Izod impact toughness and tensile elongation of poly(lactic acid) (PLA)-homopolymers are increased by about 2 to about 4 times by blending therewith a PLA-copolymer having a difunctional flexible middle segment such as a polysiloxane or a polyether from about 0.6 wt. % to about 20 wt. %. The PLA-homopolymer-PLA-copolymer blend having a difunctional flexible polymer from about 0.5 wt. % to about 10 wt. % is thermally annealed to provide impact toughness of at least about 5 kJ/m.sup.2 and tensile elongation of greater than 12%. This exceptional improvement observed in the PLA blend is a synergistic effect of the addition of the difunctional flexible polymer of the copolymer and thermal annealing. The improvement observed in the mechanical properties with high PLA homopolymer content above about 90 to about 98 wt. % is unusual and results in an increased scope of molding and thermoforming applications. The annealed PLA-copolymers having a difunctional flexible middle segment have also been found to have improved notched Izod impact properties.

The present invention concerns a method for forming a silane modified polyester composition. In addition, the invention concerns a silane modified polyester composition obtained by such method and use of such composition. In particular, the present invention concerns a method comprising subjecting polyester blend and polysiloxane mixture to react through reactive extrusion in a melt compounding process to form a silane modified polyester composition.