Abstract: A crosslinked micellar gel composition is comprised of a polymer formed by a reaction between (a) ionic surfactant units which include ionic surfactant molecules, each of which includes a counterion which has a first polymerizable functional group, (b) crosslinking agent molecules, each of which includes two second polymerizable functional groups, and (c) a reaction initiator selected from the group consisting of reaction initiator molecules and ultraviolet light radiation, wherein the reaction initiator initiates a reaction between a plurality of the ionic surfactant units with each other and a plurality of the ionic surfactant units with the second polymerizable functional groups. The polymer compositions formed from the reactions are crosslinked micellar gels which include a network structure of rodlike micelles forming a soft gel material which retains features and utility of rodlike micelles and benefits from the structural stability of a crosslinked polymer matrix.

Abstract: The present invention provides a water soluble polymer which is prepared by the following steps. First, a carboxyl group-containing polymer is reacted with an alkaline reagent so that a portion of the carboxyl groups are reacted in an amount sufficient to make the polymer water soluble. Then, the polymer obtained is reacted with an epoxide containing unsaturated bonds and/or heteroatoms so that 1 to 100 mole percent of the remaining carboxyl groups of the polymer are reacted with the epoxide to form ester groups via a ring-opening reaction of epoxides, wherein the heteroatom can be silicon, nitrogen, phosphorus or sulfur. The water soluble polymer of the present invention can be used as a photosensitive resin. When the photoresist composition is used for preparing printed ciruit boards, it exhibits high photosensitivity, good water dispersability, storage stability, and good adhesion to copper. In addition, the problem of sticking to the mask can be prevented.

Abstract: An ink for ink-jet recording contains a coloring agent, a polymerizable oligomer, water, and a photopolymerization initiator having a solubility in water of 3 percent by weight or more. Another ink for ink-jet recording contains a coloring agent, a polymerizable oligomer having at least two acryloyl groups and a solubility in water of 10 percent by weight or more, a photopolymerization initiator, and water. The specified polymerizable oligomer or photopolymerization initiator reduces bleeding of the ink on recording media.

Abstract: A photosolder resist composition of the invention is characterized by containing (A) a resin containing radical polymerization groups and carboxyl groups obtained by adding a cyclic ether group of a cyclic ether group-containing vinyl monomer to a carboxylic group of a radical copolymer containing at least isobornyl (meth) acrylate and a carboxyl group-containing vinyl monomer as monomer units; (B) an inorganic filler; and (C) a photocurable mixture of a polyfunctional acrylic monomer (c1), a cyclic ether group-containing compound (c2), and a photopolymerization initiator (c3).

Abstract: A composition and method that provides a chemically grafted coating onto a substrate. The composition comprises an acrylate and a grafting initiator. The acrylate may be a waterborne urethane acrylate. The composition may also comprise resistance agents, adhesion agents, UV curing photoinitators, defoaming agents, and/or deglossing agents. The substrate may be any wood or plastic, but works well with heat shrinkable polyolefin tubing. The composition may also be quick curing such that the coating from the composition may be cured under a D bulb and an H bulb at a rate of 100-160 feet/minute. The coating on the substrate resists delamination and wear. The coating may have indicia printed on the coating, the indicia being composed from ink or other printable materials.

Abstract: The invention relates to a novel process for the manufacture of mouldings, especially contact lenses, in which a soluble prepolymer comprising crosslinkable groups is crosslinked in solution, and also to mouldings, especially contact lenses, obtainable in accordance with that process. The present invention relates also to novel prepolymers that can be used in the process according to the invention, especially derivatives of a polyvinyl alcohol having a molecular weight of at least about 2000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprise from approximately 0.

Abstract: An useful aqueous photocurable resin composition is provided. The aqueous photocurable resin composition of the present invention comprises at least water, a polymerizable material polymerizable with radical initiation and a water-soluble photopolymerization initiator which generates a radical with light, wherein the polymerizable material has at least two polymerizable functional groups and one anionic functional group.

Abstract: An ink for ink-jet recording contains a coloring agent, a polymerizable oligomer, water, and a photopolymerization initiator having a solubility in water of 3 percent by weight or more. Another ink for ink-jet recording contains a coloring agent, a polymerizable oligomer having at least two acryloyl groups and a solubility in water of 10 percent by weight or more, a photopolymerization initiator, and water. The specified polymerizable oligomer or photopolymerization initiator reduces bleeding of the ink on recording media.

Abstract: A monomer-grafted cross-linked polymer is prepared by the steps of activating a polymer by radiation, quenching the activated polymer so as to effect cross-linking therein, activating the cross-linked polymer by irradiation and contacting the activated cross-linked polymer with an emulsion that includes an unsaturated monomer, an emulsifier and water. The activated cross-linked polymer is contacted with the emulsion for a sufficient time to effect a desired extent of grafting.

Abstract: A method for producing an acrylic graft polymer on the surface of a polyolefin article is disclosed. The method comprises the steps of immersing the polyolefin article in a solution of a photoinitiator in a volatile solvent, allowing the volatile solvent in the photoinitiator solution to vaporize, immersing the polyolefin article in a solution of an acrylic monomer, and subjecting the polyolefin article, while in a suitable atmosphere, which can be air or can be inert, to ultraviolet irradiation to cause the acrylic monomer to graft to the polyolefin surface. A method which involves subjecting a polyolefin article to corona discharge, immersing the article, after corona discharge treatment, in a solution of a photoinitiator and an acrylic monomer in a volatile solvent, and subjecting the article to ultra violet irradiation to cause the acrylic monomer to graft to the polyolefin surface is also disclosed. The latter method improves the ammonia trapping capacity of the grafted article.

Abstract: Process for using microwave irradiation to prepare solutions of polymers functionalized with acid groups The invention relates to a process for preparing aqueous, hydrous and anhydrous solutions of polymers functionalized with acid groups, which comprises using microwave radiation to supply the heat required to prepare the solution. The solutions are suitable as a starting material for producing gas diffusion electrodes, fuel cells and polymer-electrolyte-stabilized platinum nanoparticles.

Abstract: This invention relates to radiation-curable coating compositions which contain A) compounds having one or more free-radically polymerisable double bonds which additionally contain at least one further functional group reactive for the purposes of an addition and/or condensation reaction, B) compounds having one or more free-radically polymerisable double bonds, which additionally contain at least one further functional group reactive for the purposes of an addition and/or condensation reaction, wherein the additional reactive functional group is complementary to or reactive towards the additional reactive functional groups of component A), C) optionally at least one monomeric, oligomeric and/or polymeric compound having at least one functional group reactive towards the functional groups from component A) or component B) D) one or more photoinitiators as well as E) optionally solvents, water, pigments and/or extenders as well as conventional lacquer additives, wherein component A) and component B) diffe

Abstract: A water-based, flash-curable ink jet ink that is capable of adhering to plastic substrates such as flexible polyvinyl chloride, the ink comprising: a) at least one water-dispersible or water-soluble acrylate polymerizable material; b) at least one polymerizable material that is capable of softening the substrate in part or in fill and is resistant to hydrolysis; c) at least one colorant such as a pigment, a dye, or both a pigment and a dye; and d) at least one UV photoinitiator.

Abstract: A photosensitive resin composition developable with water or a diluted alkali solution comprises the following components (A) to (D). That is, the component (A) is a water-soluble photosensitive resin selected from the group consisting of a first resin obtained by introducing a styryl pyridinium group into a polyvinyl alcohol polymer, a second resin obtained by introducing a styryl quinolinium group into the polyvinyl alcohol polymer, and a third resin obtained by adding N-alkylol (meth)acrylamide to the polyvinyl alcohol polymer. The component (B) is a photosensitive prepolymer having a carboxyl group and at least two ethylenically unsaturated groups in molecule. The component (C) is a photopolymerization initiator. The component (D) is water. The photosensitive resin composition will be preferably used as a photoresist ink for manufacturing printed wiring boards.

Abstract: A radiation curable secondary coating composition for forming a secondary polymeric coating having good hydrophobic properties on a primary polymeric coating on an optical fiber is disclosed. The secondary coating composition is a mixture of a radiation curable composition capable of forming a polymeric coating, such as aliphatic difunctional and trifunctional urethane oligomers, and a hydrophobic agent selected from the group consisting of an aqueous dispersion of negatively charged hydrophobic resin particles, fluoropropylmethylcyclotrisiloxane, fluoropropylmethylsiloxarediol, trifluoropropylsiloxypolydimethylsiloxane, polybutadiene diacrylate and polybutadiene dimethacrylate.

Abstract: The invention relates to a novel process for the production of mouldings, in particular contact lenses, in which a soluble prepolymer comprising units containing a crosslinkable group and at least one unit containing a modifier is crosslinked in solution, and to mouldings, in particular contact lenses, obtainable by this process. The present invention likewise relates to novel prepolymers which can be employed in the novel process, in particular derivatives of a polyvinyl alcohol having a molecular weight of at least about 2000 which comprises from about 0.

Abstract: An ultraviolet curable coating composition for cationic electrodeposition applicable to metal plated materials which composition comprises 100 weight parts of acrylic resin containing 10 to 70% by weight poly-functional acrylate per se having 3 or more acryloyl groups and 90 to 30% by weight of a resin of molecular weight 2,000-30,000 having a cationic electrodeposition property, and 0.1-10 weight parts of 2 or more species of photopolymerization initiators which absorb ultraviolet radiation in a wavelength range of 300-400 nm, as effective ingredients. The coating composition can readily be deposited electrically on metal materials including plated products and plastic materials provided with electrical conductivity and cured by irradiation of ultraviolet radiation within a short period of time to give a dry coating film which is appreciable in adhesiveness to the plated materials and good in appearance.

Abstract: The present invention relates to; resin molded articles having on one side of the resin substrate thereof, such as polycarbonate, a scuff resistant organic hard coat layer and on the other surface of the substrate an antifogging organic hard coat layer; resin shaped articles such as into helmet shields, goggles, and the like, in which the organic hard coat layer will not peel off the substrate when molded into a curve-shaped article having a radius of curvature of 50 mm or less and which will cause no optical distortions; a process for the manufacture thereof; and the covering materials for forming each hard coat layer.

Abstract: Disclosed is a UV-curable transfer ink which can be cured by UV and used to emboss a precise and clear pattern on a substrate. It comprises 20-40% by weight of a UV-reactive ink, 20-40% by weight of an acrylic copolymer, 4-6% by weight of an ethylene vinyl acetate copolymer, 25-35% by weight of an organic solvent and 0.5-5% by weight of a bulking agent. A printing sheet is also provided, on which the transfer ink is printed in a predetermined pattern. An embossed pattern is obtained by applying the sheet to a substrate, exposing it to UV to cure the printed transfer ink, releasing the printing sheet to leave the cured transfer ink on the substrate, and etching the substrate.

Abstract: A monomer-grafted cross-linked polymer is prepared by the steps of activating a polymer by radiation, quenching the activated polymer so as to effect cross-linking therein, activating the cross-linked polymer by irradiation and contacting the activated cross-linked polymer with an emulsion that includes an unsaturated monomer, an emulsifier and water. The activated cross-linked polymer is contacted with the emulsion for a sufficient time to effect a desired extent of grafting.

Abstract: A method of making radiation-curable, fiber optic materials having extended shelf-life and reduced water content which when suitably cured provide reliable and consistent adhesion characteristics to optical glass fibers.

Abstract: Disclosed is a photo-curable composition comprising the following components (A) to (C): (A) hydrolyzable silane compound represented by the general formula (1) or a hydrolyzate thereof: (R1)pSi(X)4−p (1) wherein R1 is a non-hydrolyzable organic group having 1 to 12 carbon atoms, X is a hydrolyzable group, and p is an integer of 0 to 3; (B) photo acid generator; and (C) dehydrating agent. By such constitution, it is possible to provide a photo-curable composition which has a rapid photo-curable rate, is excellent in characteristics such as storage stability, heat resistance, weather-ability, scratch resistance and the like, and is applicable to base materials having low heat resistance such as plastics, as well as a cured product obtained therefrom.

Abstract: A waterborne photoimageable composition or photoresist comprises a latex binder polymer based on a waterborne dispersion of a photopolymerizable urethane acrylate oligomer having sufficient carboxylic acid functionality to render it develop able in alkaline aqueous solution and a photo initiator chemical system and other components to produce an aqueous coatable and alkali develop able photoresist composition.

Abstract: A process for preparation of ceramic objects which comprises: (a) applying a layer of a high-solids photocurable ceramic composition, to a substrate, the composition comprising: (1) at least 10 percent by volume of water; (2) at least 0.05 percent by weight of photocurable compounds which are soluble or dispersible in water; and (3) at least 45 volume percent dispersed ceramic particles; and (b) subjecting the composition to sufficient ultraviolet radiation to react the compounds or polymers sufficiently to form a layer of the photocurable compounds or polymers, which is water-insoluble and non-dispersible in water, having the ceramic particles dispersed therein.

Abstract: The invention provides an insulating paste, comprising: an organic vehicle containing an organic binder, a photo-polymerization initiator and a photosetting monomer; and a silicate glass powder having a softening point in a range of about 700° C. to 1,050° C. and having an average particle size in a range of about 0.1 to 5.0 &mgr;m, said silicate glass powder being dispersed into said organic vehicle. Preferably, the silicate glass powder of the above insulating paste comprises a composition represented by xSiO2—yB203—zK2O where x+y+z is 100 parts by weight and the values z, y and z are on lines or within a region enclosed by lines passing through four points A(65, 35, 0), B(65, 20, 15), C(85, 0, 15) and D(85, 15, 0) on a ternary diagram thereof.

Abstract: Radiation-setting compositions suitable for the formation of LCD spacers or protective layers which are excellent in photosetting properties (requiring no heat-setting) and development properties, have high adhesiveness to substrates and excellent mechanical characteristics, remain stable over a long storage time and show excellent working condition-dependency. Such a radiation-setting composition for the formation of LCD spacers or protective layers comprises a (meth)acrylic acid-based copolymer having an acid value of 30 to 200 and a glass transition temperature of −30 to 180° C., a (meth)acrylate-based compound obtained by copolymerizing a monomer having a specific structure with a monomer at least having an acidic group, a radiation-sensitive compound and a solvent.

Abstract: This invention relates to a radiation curable silicone coating composition comprising an alkoxylated resin-polymer organosilicone network containing radiation curable functionality and a cationic photoinitiator. The radiation curable silicone compositions of this invention are useful as fast curing low and high release coating compositions which are especially suitable for release of pressure sensitive adhesives.

Abstract: The present invention relates to a radiation-curable binder BM consisting of a copolymer which is composed of: A) from 80 to 99% by weight of a hydroxyl-containing polyether acrylate and/or polyester acrylate A), which optionally contains a mono-, di- and/or polyamine AA) as adduct, and of B) from 1 to 20% by weight of benzophenonetetracarboxylic acid, its anhydrides and/or its esters. The invention additionally relates to processes for the preparation of the binder BM and to the use of the binders BM in radiation-curable coating compositions.

Abstract: The invention relates to moulded ophthalmic articles, especially contact lenses, which are obtainable by cross-linking a prepolymer which is the copolymerization product of (a) at least one polyalkylene glycol of the formula (1): HO--(CH.sub.2 --CH.sub.2 --O).sub.n --(CHY.sub.1 --CHY.sub.2 --O).sub.m --(CHY.sub.3 --CHY.sub.4 --O).sub.p --H or (1'): HO--[(CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 --O--)].sub.q --H, (b) at least one polyhydroxy compound selected from the group consisting of (I) a linear or branched aliphatic polyhydroxy compound of the formula (2): R.sub.1 --(OH--).sub.x or a polyether polyol or polyester polyol derived therefrom, and (ii) a cycloaliphatic polyol selected from the group polyhydroxy-C.sub.5 -C.sub.8 -cycloalkane and unsubstituted mono- or disaccharide, (c) at least one di- or polyisocyanate of the formula (3): R.sub.2 --(NCO).sub.

Abstract: An aqueous unpigmented coating and printing composition useful for gravure and flexographic printing on plastic and metal substrates is provided by preparing an aqueous emulsion of a hydrophobic UV curable oligomer and a photoinitiator and adding about 1 to 10% by weight of the composition of a water soluble or reducible polymeric thickener in an amount effective to provide a viscosity of about 10 to 50 poises and specified rheology properties whereby the composition is capable of yielding clear cured films as low as about 2 microns in thickness.

Abstract: Gels for thermotropic layers, obtainable by irradiating a mixture comprisinga) an uncrosslinked polymer in amounts of less than 5% by weight, based on the sum of a), b) and c),b) monomers which can be polymerized by means of free radicals, andc) water or an organic solvent, or a mixture thereof,with high-energy light.

Abstract: Radiation-curable preparations comprise at least one polymer which has ethylenically unsaturated double bonds and are used for the coating of mineral moldings.A process for coating mineral moldings, and also mineral moldings which have a coating cured by radiation, are also described.

Abstract: An impoved barrier or drug delivery system which is highly adherent to the surface to which it is applied is disclosed, along with methods for making the barrier. In the preferred embodiment, tissue is stained with a photoinitiator, then the polymer solution or gel having added thereto a defined amount of the same or a different photoinitiator is applied to the tissue. On exposure to light, the resulting system polymerizes at the surface, giving excellent adherence, and also forms a gel in the rest of the applied volume. Thus a gel barrier of arbitrary thickness can be applied to a surface while maintaining high adherence at the interface. This process is referred to herein as "priming". the polymerizable barrier materials are highly useful for sealing tissue surfaces and junctions against leaks of fluids. In another embodiment, "priming" can be used to reliably adhere preformed barriers to tissue or other surfaces, or to adhere tissue surfaces to each other.

Abstract: This invention relates fluorinated polymers having high structural regularity, characterized by a high maximum operating temperature and by improved mechanical and processability properties, prepared by a (co)polymerization process of fluorinated olefinic monomers, optionally in association with non-fluorinated olefins, in aqueous emulsion, in the presence of radical photoinitiators and of ultraviolet-visible radiation.

Abstract: The invention relates to a process for the preparation of articles with a three-dimensional surface structure, in which a substrate is printed, at least one of the printing inks employed for the printing being varnish-repellent, and the printed substrate is then varnished. In accordance with the invention, the printed substrate is varnished with a radiation-curable varnish which contains no amino resin and comprisesA) from 18 to 99.9% by weight of an epoxy acrylate, a polyether acrylate or a polyester acrylate,B) from 0.1 to 5.0% by weight of a Bronsted acid or an acid anhydride,C) from 0 [sic] to 12% by weight of a photoinitiator,D) from 0 to 40% by weight of water or at least one organic solvent,E) from 0 [sic] to 10% by weight of a polyol which may be ethoxylated and/or propoxylated and has from 2 to 50 carbon atoms in the molecule, andF) from 0 [sic] to 30% by weight of other auxiliaries and additives,and the varnish coat applied is cured with high-energy radiation.

Abstract: Photocurable addition-polymerizable compositions containing a free-radically-polymerizable monomer and a photoinitiator system containing i) an arylidonium salt, ii) a sensitizing compound, and iii) an electron donor having an oxidation potential that is greater than zero and less than or equal to that of p-dimethyoxybenzene (1.32 volts vs. S.C.E.). The compositions cure rapidly and deeply under ultraviolet or visible light.

Abstract: A method of preparing an aqueous suspension of organosilanized colloidal silica particles is disclosed. Such particles are used in a variety of applications including density gradient separation media, anti-abrasion coatings and toner materials. The disclosed process is environmentally safe and produces a product that is aqueous and non-toxic to most biological cells.

Abstract: Described are aqueous, radiation-curable coating compositions comprising:a) from 5.0 to 90.0% by weight of at least one water-dispersible polymer P comprising at least one .alpha.,.beta.-ethylenically unsaturated, radiation-polymerizable double bond,b) from 0.1 to 90% by weight of at least one radiation-curable compound S which is different from P and which is soluble in water or is dilutable with at least 10% by weight of water, based on the overall weight of the coating composition, and which comprises at least one .alpha.,.beta.-ethylenically unsaturated, radiation-polymerizable double bond,c) from 0 to 20% by weight of a photoinitiator,d) from 0 to 60% by weight of a filler,e) from 0 to 20% by weight of further additives,f) water to 100% by weight and their use.

Abstract: A free-radical curable polish composition is described. The composition can be applied and cured as an ultra thin film on finished surfaces to provide enhanced chemical and mar resistance. The composition comprises an aqueous emulsion including an olefin-functional polymer or an olefin-functional prepolymer, and a silicone or silicone copolymer preferably with photoinitiators for UV and EB cure. The polish/emulsion can be applied, for example, to wet the surface of nitrocellulose lacquer wood finishes. The polish wet surface is first wiped to remove excess polish and thereafter exposed to UV radiation to provide a thin, polymerized protective film.

Abstract: A photopolymerizable material is provided that is suitable for use in the production of coatings or resists on printed circuit boards, for example The material is an ethylenically unsaturated polymerizable reaction product of a polyepoxide and a mixture of (i) a major proportion of an ethylenically unsaturated carboxylic acid and (ii) a minor. proportion of a saturated aliphatic or aromatic carboxylic acid, the reaction product being further modified by reaction with a dicarboxylic acid or anhydride thereof.

Abstract: Disclosed are waterborne, stable photoresist compositions and methods of their preparation and use. The compositions are characterized by increased shear and storage stability. The photoresist composition comprises an aqueous emulsion of a 22% or less neutralized carboxylated resin and non-ionic surfactant containing poly(ethylene-oxide) segments, photopolymerizable monomer and photoinitiator. Neutralization is accomplished using either an organic or an inorganic base or mixtures thereof. The photoresist compositions are useful to selectively coat and protect surfaces subjected to corrosive environments, e.g., etchant processes, in the production of circuit traces for electronic circuit boards.

Abstract: Disclosed herein is an ink comprising a pigment, a water-soluble resin, a water-soluble monomer to be set by application of energy and a photopolymerization initiator in an aqueous liquid medium.

Abstract: The present invention relates to an aqueous-based coating composition for forming strippable, protective coating for protecting surfaces, such as glass, metal, ceramic, plastic or other materials of construction. More specifically, the compositions and coatings formed therefrom of this invention are particularly useful in connection with protecting precision surfaces, such as optical lenses, including but not limited to ophthalmic lenses, telescopic lenses, microscopic lenses, and the like, which protection is desirably only of a temporary nature.

Abstract: Photopolymerisable compositions are described which comprisea) 20 to 80% by weight of a specific film-forming, acid group-containing acrylate of higher molecular weight which is neutralised with ammonia or an amine or an inorganic base, at least 10% by weight of component a) consisting of a acrylate of higher molecular weight which is derived from a reaction product of a polymolecular epoxy resin that is advanced with a bisphenol and an ethylenically unsaturated monocarboxylic acid and after subsequent reaction with a cyclic anhydride of an organic polycarboxylic acid,b) 0.1 to 15% by weight of a photoinitiator,c) 1 to 25% by weight of optional components, andd) water, as well ase) at least one additional optional (meth)acrylate monomer or (meth)acrylate oligomer or a vinyl compound that can be crosslinked with light.The compositions contain no additional polymolecular polymer binders and which can be used as aqueous applicable photoresist compositions, preferably for coating printed circuit boards.

Abstract: A waterborne photoimageable composition, developable in alkaline aqueous solution, which is hardenable to form a hard, permanent layer suitable as a solder mask, comprisesA) between about 25 and about 40 wt % of a latex acrylic binder polymer having an acid number between about 125 and about 200 and a number average molecular weight of between about 20,000 and about 80,000,B) between about 13 and about 30 wt % of a waterborne epoxy resin having an epoxy equivalent weight of between about 100 and about 700,C) between about 20 and about 35 wt % of photopolymerizable, multi-functional .alpha.,.beta.-ethylenically unsaturated monomer and/or short-chain oligomer having a molecular weight between about 500 and about 2000,D) between about 4 and about 20 wt % of a free-radical generating chemical system,E) between about 0.5 and about 10 wt % of an epoxy curative and/or cure catalyst, andF) between about 3 and about 12 wt % surfactant(s), the weight percentages being based on total weight of A)-F).

Abstract: A water-based, UV-curable ink for plastic substrates, comprising:a) a water-dispersible or water-soluble urethane acrylate oligomer;b) a monomer that is capable of softening the substrate in part or in full; the monomer being resistant to hydrolysis; andc) a passive resin that is soluble in the monomer.

Abstract: A near infrared rays-curing putty composition containing (A) a polymerizable ethylenically unsaturated group-containing resin, (B) a polymerizable ethylenically unsaturated compound and (C) a near infrared rays polymerization initiator, said near infrared rays polymerization initiator (C) being a near infrared rays-absorbing cationic dye and a resin powder consisting of gelation polymer fine particles.

Abstract: The invention relates to a novel process for the manufacture of mouldings, especially contact lenses, in which a soluble prepolymer comprising crosslinkable groups is crosslinked in solution, and also to mouldings, especially contact lenses, obtainable in accordance with that process. The present invention relates also to novel prepolymers that can be used in the process according to the invention, especially derivatives of a polyvinyl alcohol having a molecular weight of at least about 2000 that, based on the number of hydroxy groups of the polyvinyl alcohol, comprise from approximately 0.5 to approximately 80% of units of formula I ##STR1## wherein R is lower alkylene having up to 8 carbon atoms,R.sup.1 is hydrogen or lower alkyl andR.sup.

Abstract: An improved barrier or drug delivery system which is highly adherent to the surface to which it is applied is disclosed, along with methods for making the barrier. The barrier can be prepared by staining tissue with a photoinitiator, applying a solution containing a polymerizable barrier material solution and a photoinitiator to the tissue, and polymerizing the polymer solution on exposure to light. The resulting polymer adheres strongly to the tissue surface, and also forms a gel in the rest of the applied volume. The polymerizable barrier materials are highly useful for sealing tissue surfaces and junctions against leaks of fluids. The method can be used to adhere preformed barriers to tissue or other surfaces, or to adhere tissue surfaces to each other. Tissue surfaces can be adhered to each other to repair wounds. In addition to photochemical initiators, non-photochemical initiators and combinations of chemical initiators and photochemical initiators can be used.

Abstract: Novel radiation-curable, organically-modified siloxane resin compositions are prepared from (A) at least one multifunctional acrylate and (B) the reaction product formed from (a) an alkoxy-functional organometallic compound, (b) an alkoxy silane and (c) water. The alkoxy silane (b) includes at least one functional group that renders the alkoxy silane copolymerizable with the multifunctional acrylate (A). The alkoxy-functional organometallic compound (a) and the alkoxy silane (b) undergo co-hydrolysis and co-condensation, which is optionally carried out in the presence of a siloxane polymerization catalyst (d).