Provided are a phosphazene compound, a method for preparing a phosphazene compound and a method for producing a polymer with a phosphazene compound as a catalyst. The compound of formula (I) or a solvate thereof, where A is a six- or eight-membered ring consisting of repeated P═N, and B is at least one of unsubstituted or substituted C.sub.1-6 alkylamino, unsubstituted or substituted C.sub.1-6 cycloalkylamino, unsubstituted or substituted arylamino, ##STR00001##
or halogen, and B is attached to A at phosphorus in P═N, where R is unsubstituted or substituted C.sub.1-6 alkyl, unsubstituted or substituted C.sub.1-6 cycloalkyl, unsubstituted or substituted aryl, or unsubstituted or substituted benzyl, or R forms C.sub.1-6 heterocycloalkyl together with N attached thereto. ##STR00002##

The invention relates to a method for producing a polyoxyalkylene polyester polyol by reacting a polyoxyalkylene polyol with a lactone in the presence of a Brønsted acid catalyst, wherein the catalyst has a pKa value of 1 or less; the number-average molar mass of the polyoxyalkylene polyol is ≥1000 g/mol, preferably ≥1500 g/mol, particularly preferably ≥2000 g/mol; and in the lactone a CH2 group is bonded to the ring oxygen. The invention further relates to polyoxyalkylene polyester polyols obtainable using the method according to the invention, and to a method for producing polyurethanes by reacting the polyoxyalkylene polyester polyols according to the invention with polyisocyanates.

The invention relates to a method for producing a polyoxyalkylene polyester polyol by reacting a polyoxyalkylene polyol with a lactone in the presence of a Brønsted acid catalyst, wherein the catalyst has a pKa value of 1 or less; the number-average molar mass of the polyoxyalkylene polyol is ≥1000 g/mol, preferably ≥1500 g/mol, particularly preferably ≥2000 g/mol; and in the lactone a CH2 group is bonded to the ring oxygen. The invention further relates to polyoxyalkylene polyester polyols obtainable using the method according to the invention, and to a method for producing polyurethanes by reacting the polyoxyalkylene polyester polyols according to the invention with polyisocyanates.

A polyol polymer is obtained from reactants including: a) a non-aromatic epoxy functional compound that includes at least 30 weight % of the total solids weight of the reactants; and b) an aromatic mono-carboxylic acid functional compound, or anhydride thereof, that is substantially free of non-aromatic ethyl enic unsaturation. The polyol polymer has ester linkages and hydroxyl functional groups, Further, if the reactants further include an aromatic polycarboxylic acid, the aromatic polycarboxylic acid makes up less than 15 weight % of the total solids weight of the reactants. A coating composition is also prepared with the polyol polymer.

Embodiments include degradable polyethers comprising ester units from a cyclic ester or carbonate units from carbon dioxide incorporated into a poly(ethylene oxide) backbone or a multifunctional core of a degradable polyether star. Embodiments include methods of forming a degradable polyether comprising contacting an ethylene oxide monomer with a lactide monomer or carbon dioxide in the presence of an alkyl borane and an initiator. Embodiments include methods of forming degradable polyether stars comprising contacting a diepoxide monomer with carbon dioxide and/or a cyclic ester in the presence of an initiator and a first amount of an alkyl borane to form a multifunctional core comprising degradable carbonate linkages and/or degradable ester linkages, and contacting the multifunctional core with an ethylene oxide monomer in the presence of a second amount of an alkyl borane to form arms of a polyether attached to the degradable multifunctional core.

Embodiments include degradable polyethers comprising ester units from a cyclic ester or carbonate units from carbon dioxide incorporated into a poly(ethylene oxide) backbone or a multifunctional core of a degradable polyether star. Embodiments include methods of forming a degradable polyether comprising contacting an ethylene oxide monomer with a lactide monomer or carbon dioxide in the presence of an alkyl borane and an initiator. Embodiments include methods of forming degradable polyether stars comprising contacting a diepoxide monomer with carbon dioxide and/or a cyclic ester in the presence of an initiator and a first amount of an alkyl borane to form a multifunctional core comprising degradable carbonate linkages and/or degradable ester linkages, and contacting the multifunctional core with an ethylene oxide monomer in the presence of a second amount of an alkyl borane to form arms of a polyether attached to the degradable multifunctional core.

Disclosed is a composition based on copolymers including at least one A-B block copolymer, wherein block A is a polyester and block B is a polyoxyethylene (PEG), and wherein the total molecular mass in weight of the PEG is higher than or equal to 50 kDa, and the ethylene oxide motif/ester motif molar ratio is between 0.5 and 5. The invention also relates to an anti-adhesive material including such a composition, used for the prevention of tissue adhesions and especially for the prevention of intrauterine synechiae.

The invention relates to compositions of co-polymers having hydrophilic and biodegradable hydrophobic units or blocks, resulting in improved properties and functionalities suitable for biomedical applications as self-fitting tissue scaffolds or minimally invasive surgical implants.

The invention relates to compositions of co-polymers having hydrophilic and biodegradable hydrophobic units or blocks, resulting in improved properties and functionalities suitable for biomedical applications as self-fitting tissue scaffolds or minimally invasive surgical implants.

New polymer compositions based on poly(2,6-dimethyl-1,4-phenylene oxide) and other high-softening-temperature polymers are disclosed. These materials have a microphase domain structure that has an ionically-conductive phase and a phase with good mechanical strength and a high softening temperature. In some arrangements, the structural block has a softening temperature of about 210° C. These materials can be made with either homopolymers or with block copolymers. When these polymers are combined with electrolyte salts, they can be used as electrolytes that have both high ionic conductivity and good mechanical properties.