摘要:
Methods for synthesizing saturated and unsaturated polyol polymers are disclosed. The polyol polymers are prepared by the esterification of a di- or polycarboxylic acid with a polyhydric alcohol or a polyhydric alcohol modified to include one or more (meth)acrylate moieties, using an enzymatic catalyst, advantageously avoiding the use of an acidic or heavy metal catalyst. The polyol polymers can be used to prepare urethanes or urethane acrylates, and the urethanes or urethane acrylates used in coating compositions, for example, to provide a coating to surface coverings such as floor, wall and ceiling coverings. The polyol polymers and/or urethane (meth)acrylates can also be used to prepare other articles of manufacture, such as food wraps, children's toys and the like.
摘要:
A biodegradable antithrombotic conjugate having heparin and other anti-thrombotic moieties are introduced as side chains to the polymer backbone modified by a click chemistry reaction. Various bioabsorbable monomers and dimers such as valerolactone may be used in the monomer derivation, homo- and co-polymerization, and the conjugation with a biologically active molecule by click chemistry. A coating comprising a biocompatible and bioabsorbable polymer anti-thrombotic conjugate is applied to at least a portion of an implantable device to prevent or reduce the formation of thrombosis on the surface of the implantable device. A first or sub-layer of the coating is prepared by mixing a polymeric material and a biologically active agent with a solvent, thereby forming a homogeneous solution. A second or outer layer comprising the present anti-thrombotic conjugate may be applied over the inner drug-containing layers using, for example, a dip coating or spray coating process.
摘要:
Process for the modification of a polymer or copolymer having the following general structure for one or more of the repeating units: (1) wherein n is an integer, m is an integer in the range 0 to 6, and R is selected from hydrogen, substituted or unsubstituted C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl, and C7-C20 alkaryl, which groups may include linear or branched alkyl moieties; the optional one or more substituents being selected from the group consisting of hydroxy, alkoxy, linear or branched alk(en)yl, aryloxy, halogen, carboxylic acid, ester, carboxy, nitrile, and amido groups, which process involves contacting the polymer or copolymer with a cyclic organic peroxide under conditions whereby at least some of said peroxide is decomposed. This process results in a (co)polymer with a high degree of branching but free of gel formation.
摘要:
The present invention relates to a clear paint composition having at least one hyperbranched, dendritic hydroxyfunctional polyester having an OH number ≥ 180 measured according to DIN 53240 and a hyperbranched, dendritic hydroxyfunctional polyester having an OH number ≥ 180 measured according to DIN 53240. The present invention further relates to a method for producing the hyperbranched, dendritic hydroxyfunctional polyester, the use of the clear paint composition for producing clear paint coating compositions for automotive series painting, and substrates coated therewith.
摘要:
A polycarbonate-polyester block copolymer includes a polycarbonate block and a polyester block, each having specific structures. The block copolymer can be prepared, at least in part, from renewable feedstocks. In some forms, the block copolymer includes biodegradable segments that facilitate structural breakdown of objects molded from the block copolymer. Methods of preparing the block copolymer are described, as are compositions that include it and articles prepared from it.
摘要:
The present invention relates to a polymer having improved thermal stability and to a method for preparing said polymer that enables control of its thermal degradation and stability via chemical structure of the polymer end groups. Further the present invention relates to a blend comprising said polymer. Finally, the present invention relates to use of said polymer or blend for the preparation of polymeric materials for applications in medical, environmental, agricultural and advance materials.
摘要:
A process for producing polylactide-urethane copolymers, which comprises the step of contacting a polylactide having terminal hydroxyl groups, produced by contacting at least one lactide monomer with a diol or diamine, with a diisocyanate compound optionally in the presence of a second diol or diamine in the presence of a catalytic system under polymerisation conditions characterised in that the polylactide and the polylactide-urethane copolymers are produced by reactive extrusion.
摘要:
The invention is to provide a novel polyhydroxyalkanoate having a reactive function group within the molecule and a producing method therefor In a polyhydroxyalkanoate containing a unit having a vinyl group in a side chain, such vinyl group is utilized for deriving a polyhydroxyalkanoate comprising a carboxyl group or a unit having an amide group and a sulfonic acid group.