Abstract: This invention concerns a minus prescription hydrogel contact lens that permits oxygen diffusion to the cornea in sufficient quantity to avoid the effects of oxygen deprivation; avoids the physiological complications arising from damage to the bulbar conjunctivia due to compression of the limbal capillaries; and avoids corneal scleral or wetting deficiencies. These advantages are accomplished through a combination of lens design and hydrogel properties.

Abstract: Copolymers having improved machining and water resistant properties are produced using a monomer containing an adduct protecting group, particularly an alkyl boronic acid adduct, of glyceryl acrylate or glyceryl methacrylate, in combination with an alkyl acrylate or methacrylate, and optionally a glycidyl acrylate or methacrylate. After machining and shaping, the adduct is removed to provide a hydrogel useful as a contact lens material.

Abstract: A solution for removing occluded and adsorbed chemicals, such as cationic preservating agents, anionic preserving agents and mixtures thereof, from contact lenses which comprises a nonionic surfactant; a cationic ion exchange resin, an anionic ion exchange resin, or mixtures thereof; water; and optionally sodium chloride. Such solutions are useful to reduce and prevent irritation of the eye of the contact lens wearer.

Abstract: The invention provides new hydrogel forming materials comprising synthetic, hydrophilic, aqueous-insoluble polymer networks formed by copolymerization of a hydrophilic dihydroxyalkyl acrylate or methacrylate, a substantially water insoluble alkyl acrylate or methacrylate, one or more additional hydrophilic comonomers selected from the group of vinylic monomers, acrylates, and methacrylates, and a cross-linking agent. The hydrogels are preferably used for the formation of contact lenses, but may also be used for drug and pesticides delivery devices; dialysis, ultrafiltration and reverse osmosis membranes; implants in surgery and dentistry; and the like.

Abstract: The invention provides a method of treating hydrogels formed from the polymerization of monomers having reactive olefinic double bonds by contacting them with reactive thiol compounds. In a preferred embodiment where the hydrogel structure includes a cis-glycol containing unit, a suitable thiol is used in conjunction with a borate buffer. The present invention also provides materials that are treated with the above thiol compounds.

Abstract: N-Vinyl carbazoles are prepared by reacting an N-unsubstituted carbazole with a dihaloethane in the presence of a phase transfer catalyst followed by reaction with an aqueous solution containing a highly basic agent. These N-vinyl carbazoles are useful, singly or in combination with other materials, as electrical capacitors and insulators, in thermal foam insulators, as components in copolymers and in image-recording systems, and as photoconductive materials in electrophotography.

Abstract: The method of making plastic lenses ready for fitting to the contour of the wearer's eye comprising supporting a blank of plastic at one end for rotation about a predetermined axis, turning the blank down to a predetermined diameter, making an annular face cut at the distal end of the blank of predetermined radial width, making a spherically concave base cut at said distal end of predetermined depth relative to said annular face cut, reversing the blank end-for-end, making a first spherically convex cut at said end of the blank of a predetermined radius such that the distance between the inner and outer surfaces is of a predetermined thickness and making a flange cut at the marginal edge of the outer convex surface of lesser radius of curvature; and apparatus for carrying out the method.

Abstract: This process relates to the synthesis of unsaturated aliphatic esters useful as insect sex attractants, including gossyplure, the insect sex pheromone of the pink bollworm moth, Pectinophora gossypiella, and intermediates therefor. The process utilizes a cyclic phosphonium (Wittig) reagent.

Abstract: The invention provides new hydrogel forming materials comprising synthetic, hydrophilic, aqueous-insoluble polymer networks formed by copolymerization of a hydrophilic dihydroxyalkyl acrylate or methacrylate, a substantially water insoluble alkyl acrylate or methacrylate, one or more additional hydrophilic comonomers selected from the group of vinylic monomers, acrylates, and methacrylates, and a cross-linking agent. The hydrogels are preferably used for the formation of contact lenses, but may also be used for drug and pesticides delivery devices; dialysis, ultrafiltration and reverse osmosis membranes; implants in surgery and dentistry; and the like.