Abstract: Disclosed is a valve replacement comprising a braided helical design that mimics the heart's natural movement. The braided wire frame of the disclosed valve replacement may be compressed to enable compact and secure delivery into the heart and convenient control during implantation as well as the expansion and retraction when implanted or removed/replaced, preferably entirely via a catheter. The valve replacement may comprise a one-piece system comprising an adapter body with engaging mechanisms that secure to the heart, and a valve assembly with leaflets positioned within the adapter body. The valve replacement may also comprise a two-piece system comprising an adapter body and valve assembly that are compatible with each other yet wherein the valve assembly may be removable from the adapter body such that both can be delivered together or separately and such that the adapter body may remain implanted while the valve assembly may be removed and replaced.

Abstract: A coated abrasive having improved properties of grinding performance and brittleness, said abrasive comprising a backing and an abrasive coating adhered thereon wherein the abrasive coating comprises a suspension containing lapping size abrasive grains and a binder, said binder containing a diacrylated monomer and a triacrylated or higher acrylated monomer.

Abstract: This invention relates to the construction of backings for coated abrasive products that avoid curling tendencies during adhesive curing and subsequent steps. Curling of the backing is discouraged by the utilization of at least one finishing material carried by said fabric which comprises the product of a reaction between an unsaturated hexafunctional acrylated urethane oligomer component and an unsaturated carboxyfunctional monomer component. These components are caused to react with one another to form cross linking when exposed to actinic or electron beam radiation.

Abstract: Coated abrasive material having a combination backing member. The combination backing member has as a bottom member a conventional backing member substrate used in the manufacture of coated abrasive material such as cylinder paper coated with a polymeric layer. The polymer layer provides a relatively smooth surface for application of the maker coat during manufacture of the coated abrasive material. The coated abrasive member can be used in diverse applications such as the fine finishing of particle board and offhand grinding of automobile body seams.

Abstract: Coated abrasives provided with a coating comprising a grinding aid and a binder resin are particularly effective when the grinding aid is an halogenated hydrocarbon.

Abstract: Coated abrasive material for fine finishing applications including second fining ophthalmic application, having patterned surface coating of abrasive grains dispersed in radiation-cured adhesive binder. The patterned surface coating is defined by a plurality of formations of such abrasive/binder each having an inner bottom edge defining an area devoid of coated abrasive, a top edge defining a somewhat larger area devoid of coated abrasive and an inner wall connecting the top and bottom edges.

Abstract: A single step fining pad for use in a ophthalmic applications having radiation cured maker and size coats of different hardnesses.

Abstract: A coated abrasive which is advantageous for certain applications has at least two distinct layers of abrasive grits: a coarse outer layer and a finer inner layer. The median particle size of the grits in the outer layer is at least 150% of that of the inner layer grits. The grits may be adhered to the backing with adhesives compounded primarily of acrylates and cured by exposure to UV light. A product made in this way is effective for one step fining of plastic ophthalmic lenses.

Abstract: Previous coated abrasives with adhesives suited to rapid, UV light initiated cure often had intractable curl problems. Therefore, such coated abrasives have been unsuited to precision finishing of workpieces with strict flatness or other curvature requirements, such as read-write heads for magnetic recorders or computer memories.This invention provides coated abrasives, having adhesives with cure initiated by UV light, which are suited to curvature control by the methods used conventionally for magnetic recording media. The preferred adhesive formulations include reaction products of 2-hydroxyethyl acrylate with polyol polyester oligomers capped with isocyanate end groups, alkoxylated diacrylated monomers, and N-vinyl pyrrolidone and other monomers with only one polymerizable unsaturated double bond per molecule, and sometimes also include nonpolymerizable thermoplastic polymers.

Abstract: A new photopolymerizable composition which contains an addition polymerizable monomer, a photoinitiator, and an improved binding agent which is a polymer of three types of monomeric materials, namely, a styrene-type monomer, an acrylate monomer, and an alpha, beta-unsaturated carboxyl-containing monomer. These compositions are useful for flexible photopolymerizable films which, after exposure, may be developed in aqueous alkaline solutions. These films may be used as photo-resists, screen stencils and printing plates.