Abstract: There is disclosed a formulation suitable for the reduction or prevention of contamination of articles by microorganisms. The formulation includes at least one block copolymer of ethylene oxide and propylene oxide, at least one polyacrylic acid salt, and at least one propoxylated ethylenediamine compound.

Abstract: The present invention provides a poly(ethylene) glycol based polyurethane polymer composition, particularly useful in the production of contact lenses. Generally the reactant mixture used to form the polymer includes a branched chain extender. There is also provided a method of manufacturing a contact lens formed from such a polymer.

Abstract: The present invention relates to polyurethane polymer compositions prepared by reacting a mixture comprising: a) at least one poly(ethylene glycol), b) at least one polyoxyalkylene diol (typically PPG or a copolymer of ethylene oxide and propylene oxide), c) at least one di- or poly-isocyanate, d) at least one polyol or macropolyol having a functionality greater than 2, or a mixture of such polyols or macropolyols having a functionality greater than 2, e) optionally an additional compound comprising at least one hydroxyl group and at least one primary or secondary amine group. The present invention also relates to an article comprising such a polymer, in particular a medical device such as a contact lens. A process for preparing a polyurethane hydrogel is also provided.

Abstract: The present invention relates generally to production of thermoplastic materials which swell in water to produce hydrogels. These materials will hereafter be referred to as “thermoplastic hydrogels”. They are useful as contact lenses or for use in vision correction prosthetics or as cosmetic devices. In particular, the invention relates to thermoplastic hydrogels which show improved flow characteristics.

Abstract: A linear random block copolymer comprising segments of polyethylene oxide and a relatively more hydrophobic polymer, e.g. polypropylene oxide connected by hydrophobic segments containing urethane and urea groups formed from the reaction of a di-isocyanate and a diamine, wherein the diamine comprises less than 2% by weight of the total weight of the reactants used in the preparation of the copolymer.