1426 results about "Hydrophobic polymer" patented technology

A water soluble biodegradable ABA- or BAB-type triblock polymer is disclosed that is made up of a major amount of a hydrophobic polymer made of a poly(lactide-co-glycolide) copolymer or poly(lactide) polymer as the A-blocks and a minor amount of a hydrophilic polyethylene glycol polymer B-block, having an overall weight average molecular weight of between about 2000 and 4990, and that possesses reverse thermal gelation properties. Effective concentrations of the triblock polymer and a drug may be uniformly contained in an aqueous phase to form a drug delivery composition. At temperatures below the gelation temperature of the triblock polymer the composition is a liquid and at temperatures at or above the gelation temperature the composition is a gel or semi-solid. The composition may be administered to a warm-blooded animal as a liquid by parenteral, ocular, topical, inhalation, transdermal, vaginal, transurethral, rectal, nasal, oral, pulmonary or aural delivery means and is a gel at body temperature. The composition may also be administered as a gel. The drug is released at a controlled rate from the gel which biodegrades into non-toxic products. The release rate of the drug may be adjusted by changing various parameters such as hydrophobic/hydrophilic componenet content, polymer concentration, molecular weight and polydispersity of the triblock polymer. Because the triblock polymer is amphiphilic, it functions to increase the solubility and/or stability of drugs in the composition.

A membrane for use in an implantable glucose sensor including at least one crosslinked substantially hydrophobic polymer and at least one crosslinked substantially hydrophilic polymer; wherein the first and second polymers are different polymers and substantially form an interpenetrating polymer network, semi- interpenetrating polymer network, polymer blend, or copolymer. The membranes are generally characterized by providing a permeability ratio of oxygen to glucose of about 1 to about 1000 in units of (mg/dl glucose) per (mmHg oxygen). Three methods of making membranes from hydrophobic and hydrophilic monomers formed into polymer networks are provided, wherein according to at least two of the methods, the monomers may be substantially immiscible with one another.

The invention provides multi-arm block copolymers useful as drug delivery vehicles comprising a central core molecule, such as a residue of a polyol, and at least three copolymer arms covalently attached to the central core molecule, each copolymer arm comprising an inner hydrophobic polymer segment covalently attached to the central core molecule and an outer hydrophilic polymer segment covalently attached to the hydrophobic polymer segment, wherein the central core molecule and the hydrophobic polymer segment define a hydrophobic core region. The solubility of hydrophobic biologically active agents can be improved by entrapment within the hydrophobic core region of the block copolymer. The invention further includes pharmaceutical compositions including such block copolymers, methods of making such copolymers and pharmaceutical compositions, and methods of using the block copolymers as drug delivery vehicles.

A pharmaceutical formulation for delayed release of the active ingredient 3-(3-dimethylamino-1-ethyl-2-methylpropyl)phenol or a pharmaceutically acceptable salt thereof in a matrix containing between 1 and 80 wt. % of at least one pharmaceutically acceptable hydrophilic or hydrophobic polymer as a matrix forming agent and exhibiting in vivo the following release rate: 3 to 35% by weight (based on 100% by weight active ingredient) 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 0.5 hours; 5 to 50% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 1 hour; 10 to 75% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 2 hours; 15 to 82% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 3 hours; 30 to 97% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 6 hours; more than 50% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 12 hours; more than 70% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 18 hours, and more than 80% by weight 3-(3-dimethylamino-1-ethyl-2-methyl-propyl)phenol released after 24 hours.

It is an object of the present invention to provide a biosensor, which is not significantly affected by the baseline fluctuation and suppresses nonspecific adsorption. The present invention provides a biosensor, which comprises a metal surface or metal film coated with a hydrophobic polymer, and has two or more types of different surfaces in a region coated with a hydrophobic polymer.

A composition of matter comprising a water-swellable IPN or semi-IPN including a hydrophobic thermoset or thermoplastic polymer and an ionic polymer, articles made from such composition and methods of using such articles. The invention also includes a process for producing a water-swellable IPN or semi-IPN from a hydrophobic thermoset or thermoplastic polymer including the steps of placing an ionizable monomer solution in contact with a solid form of the hydrophobic thermoset or thermoplastic polymer; diffusing the ionizable monomer solution into the hydrophobic thermoset or thermoplastic polymer; and polymerizing the ionizable monomers to form a ionic polymer inside the hydrophobic thermoset or thermoplastic polymer, thereby forming the IPN or semi-IPN.

It is an object of the present invention to provide a solid substrate used for sensors that suppresses nonspecific adsorption and that is able to immobilize a physiologically active substance. The present invention provides A solid substrate used for sensors, wherein two or more different hydrophobic polymer layers are laminated on the solid substrate, and among the above hydrophobic polymer layers, the surface of a layer, which is farthest from the solid substrate, is modified.

A substrate processing apparatus 8 for feeding a processing liquid and processing a substrate W with the processing liquid comprises holding member 22 for holding the substrate W, and a lower side member 42 which is moved relatively with respect to the back surface of the substrate W held by the holding member 22 between a processing position A near the substrate undersurface and a retreat position B remote from the substrate undersurface. The processing liquid is fed between a gap between the lower side member 42 moved to the processing position A and the back surface of the substrate held by the holding member 22, and the substrate undersurface is processed. A cleaning processing unit 221a as one embodiment of the liquid processing apparatus comprises a spin chuck 22 for holding a wafer W substantially horizontally, a stage 224 substantially horizontally below the wafer W held by the spin chuck 223, and a cleaning liquid discharge openings 241 for feeding a required cleaning liquid into a gap between the wafer W held by the spin chuck 223 and the stage 224. The stage 224 has the surface coated with a hydrophobic polymer so that the surface has wetting which allows a contact angle of the cleaning liquid to be above 50E. A layer of the cleaning liquid is formed in the gap between the wafer W held by the spin chuck 223 and the stage 224 to subject the wafer W to the liquid processing.