Abstract: The present invention is concerned with a photosensitive polymer composition for a water-developable, flexographic printing plate, having a phase separating structure in a sea-and-islands state, the phase separating structure comprising island phases and a sea phase, the island phase comprising a thermoplastic elastomer component having a glass transition temperature lower than 25.degree. C., and the sea phase comprising a gelled, ethylenically unsaturated compound component.The photosensitive polymer composition of the present invention affords a printing plate capable of being developed with neutral water and suitable for flexographic printing using a water-based ink.

Abstract: UV hardenable lacquer, in particular for molded polycarbonate (PC) bodies, comprising:(A) 5 to 60%, referring to the total weight of 100% of the entire mixture, of an aliphatic polyurethane acrylate, preferably 5 to 20% of a hexa-functional PU acrylate;(B) 30 to 45%, referring to the total weight of 100% of the entire mixture, of a cross-linkable, polyfunctional acrylate having less than 20 C atoms in the molecule;(C) 0.01 to 3%, referring to the total weight of 100% of the entire mixture, of a cross-linkable polyfunctional silicon acrylate;(D) if required, between 1 and 5%, referring to the total weight of 100% of the entire mixture, of a monofunctional, ethylenically unsaturated compound such as N-vinyl pyrrolidone;(E) 0 to 70% referring to the total weight of 100% of the entire mixture, of organic solvents;(F) photo initiators; and(G) light protector.

Abstract: An antistatic resin composition which is the electron radiation cured reaction product of an electron radiation curable prepolymer and an electron radiation reactive antistatic agent soluble in the prepolymer. An antistatic laminate is made by applying a mixture of the prepolymer and antistatic agent to a substrate and then contacting the mixture with electron radiation.

Abstract: A collagen-hydrogel for promoting epithelial cell growth and regeneration of the stroma is shown. Also shown is an optical lens for the eye, fabricated from the collagen-hydrogel, which, when affixed to Bowman's membrane, promotes and supports epithelial cell growth, enables corneal epithelium of the cornea of an eye, during the healing process, to attach to and cover the anterior surface of the lens implanting the same and to regenerate the stroma which grows over the edge of and attaches to the optical lens. Laid down in the layers of the regenerated stroma are new keratocytes and collagen fibial produced from keratocytes. The collagen-hydrogel is a hydrogel polymer formed by the free radical polymerization of a hydrophilic monomer solution gelled and crosslinked in the presence of an aqueous stock solution of collagen to form a three dimensional polymeric meshwork for anchoring collagen. The collagen-hydrogel material has a ratio by weight of collagen-to-hydrogel in the range of about 0.

Abstract: A process for producing a slow-release powder which permit various active ingredients such as perfumes, insect control agents, rust inhibitors, mold inhibitors and antibacterial agents to be slowly released over a prolonged time, the process comprising the steps of mixing a long-chain compound with the ingredients, mixing the resulting mixture with urea, and exposing the resulting urea adduct to radiation.

Abstract: This invention provides:(i) an acitve energy beam-curable composition for coating the surface of optical fibers therewith, the composition comprising about 100 parts by weight of an active energy beam-curable substance, about 0.5 to about 100 parts by weight of a particulate substance having a mean particle size of about 0.2 to about 200 .mu.m and optionally a photopolymerization initiator;(ii) a coated optical fiber prepared by applying the composition of item (i) to the surface of an optical fiber and curing the coating;(iii) a bundle-type optical fiber cable prepared using the coated optical fiber of item (ii);(iv) an optical fiber unit of the tape type prepared by applying the composition of item (i) to optical fibers and curing the coating; and(v) an optical fiber prepared using the optical fiber unit of item (iv).

Abstract: Organic glasses and surface coatings are prepared, with short hardening cycles, by submitting to the action of U.V. light a liquid polymerizable composition containing at least one di-(allyl carbonate) or poly(allyl carbonate) of a diol or polyol, a photoinitiator and a vinyl ester monomer and/or an organic peroxide.The composition can additionally contain small amounts of an organic compound selected from among those compounds which are used in the art in order to stabilize the organic polymers to the degrading action of U.V. light.The composition is preferably heated before being treated with U.V. light.

Abstract: An improved process for forming hydroperoxide derivatives of rubbery polymers. The hydroperoxide derivatives being particularly well suited for use as intermediates in forming graft rubbery polymers. The process involves dissolving a rubbery polymer in a monomer mixture and adding to the rubbery polymer/monomer mixture a photosensitizing agent. The rubbery polymer-monomer mixture is then oxygenated and exposed to light under conditions wherein triplet oxygen is converted to singlet oxygen. The improvement comprises adding to the rubbery polymer/monomer mixture a solvent capable of solubilizing the photosensitizing agent in the rubbery polymer/monomer mixutre. The solubilizer increases the yield of hydroperoxide derivatives of rubbery polymers formed by a factor of 3.

Abstract: The present invention relates to a photosensitive composition containing at least one compound selected from the group consisting of N-acyl amino acid derivatives, hydroxycarboxylic acids and their derivatives, condensates of an aliphatic or aromatic aldehyde with a polyhydric alcohol, acylated polysaccharides and metallic soaps. From the photosensitive composition of the present invention, moldings having excellent shape retentivity and/or compatibility of the components thereof with one another can be produced. Therefore, the production of moldings from a composition which has been heretofore impossible is made possible. Particularly a composition having a good moldability during the molding operation can be employed. The composition is useful for the preparation of printing plate materials having a good developability and printing plates, particularly flexible printing plates and flexographic printing plates, having an improved ink solvent resistance.

Abstract: A photocured acrylic coat comprised of the photoreaction products of:(i) at least one photocurable polyfunctional acrylate monomer;(ii) at least one phenyl ketone photoinitiator; and(iii) at least one active ultraviolet radiation absorber selected from benzotriazoles, cyanoacrylates, and hydroxybenzophenones. The coating is substantially completely or completely cured and provides improved protection to the substrate against ultraviolet radiation. The coating is also nonopaque or transparent.

Abstract: A photocured acrylic coating comprised of the photoreaction products of:(i) at least one photocurable polyfunctional acrylate monomer;(ii) at least one acetophenone photoinitiator; and(iii) at least one active ultraviolet radiation absorber selected from benzotriazoles, cyanoacrylate, and hydroxybenzophenones. The coating is substantially or completely cured and provides improved protection to the substrate against ultraviolet radiation.

Abstract: The present invention relates to a photosensitive polymer composition comprising the following components A, B and C:A: 100 parts by weight of ethylenically unsaturated compounds,B: 3 to 40 parts by weight of a polyamide or 3 to 32 parts by weight of a polyesteramide soluble in the ethylenically unsaturated compounds andC: 0.01 to 10 parts by weight of a photopolymerization initiator, and a solid photosensitive printing plate material comprising the above-mentioned photosensitive polymer composition and a support, which solid photosensitive printing plate material can be easily prepared from a substantially solvent-free starting material and usable for the production of a printing plate, flexible printing plate and flexographic printing plate developable with water and/or an alcohol.

Abstract: A method for making a plastic lens and a plastic lens made thereby. The method comprises disposing a liquid monomer or a monomer mixture and a photosensitive initiator into a mold cavity and directing ultraviolet light to act on the lens forming material in the cavity to produce a lens therefrom. The liquid monomer mixture may include one or more of diethylene glycol bis(allyl)-carbonate, bisphenol A diallyl carbonate, 1,6 hexanedioldimethacrylate, trimethylol propane triacrylate, tetraethylene glycol diacrylate, tripropylene glycol diacrylate, tetrahydrofurfurylmethacrylate, tetrahydrofurfuryl acrylate and styrene. The photosensitive initiator may be selected from the group of 2-hydroxy-2-methyl-1- phenyl-propan-1-one and 1-hydroxycyclohexyl phenyl ketone.

Abstract: Polymeric dielectrics which are exposed to highly divergent electric fields break down more quickly than expected because of the generation of ultra-violet radiation at defect points which degrades the polymer locally and leads to the formation of electrical trees in a polymeric insulation. The use of ultra-violet stabilizers, preferably in combination with reduced concentration of oxygen in the polymer, significantly extends the time to initiation of electrical treeing by preventing photodegradation of the polymer.

Abstract: The invention is directed to a process for the production of polyurethanes suitable for thermoplastic processing comprising mixingI. at least 75% by weight of preformed thermoplastic polyurethane elastomers, or of a blend of(A) substantially bifunctional, compounds(B) substantially bifunctional chain-extending agents(C) organic diisocyanates and optionally(D) lubricants or other known additivessaid blend characterized in that it contains no peroxides and polymerization initiators which decompose into radicals under the effect of actinic light and further in that the molar ratio of the sum of said (A) and said (B) to said (C) is between 0.9 to 1.1, withII. (E) from 4 to 24% by weight of a crosslinking agent andIII. (F) from 0.01 to 3% by weight of a polymerization inhibitor and/or an antioxidant,by adding said II and said III to said I at a temperature below 230.degree. C., and the cooling the mixture to below 130.degree. C.

Abstract: A process for preparing particulate water-soluble cationic acrylic polymers having a high molecular weight, an excellent water solubility and a uniform particle size with a good productivity by adding a combined photoinitiator system of an azoguanyl compound and other usual photoinitiator to an aqueous monomer solution containing a cationic vinyl monomer, irradiating the aqueous monomer solution in the form of a thin layer on a moving support with ultraviolet rays in at least two stages, and finely dividing the produced aqueous polymer gel in a wet state by a roller cutter and then by a vertical cutter.

Abstract: Stabilized solutions of radiation-crosslinkable polymer precursors of highly heat-resistant polymers, containing chelate complex-formers as stabilizers, do not tend to gel through premature crosslinking and can thus be stored and used over a long period.

Abstract: An image reproducing material which comprises a support and at least a photosensitive resin layer and scratch resistance layer borne on the support, said scratch resistance layer containing a compound represented by AmBn, wherein A is mono- or divalent, straight or branched C.sub.11-20 aliphatic hydrocarbon; B is hydrogen, hydroxyl, amino, nitrile, aldehyde, carboxyl, or alkylamide, alkylester, ammonium salt or a periodic table group I-IV metal salt of a carboxylic acid; m is an integer of 1 to 3; and n is 1 or 2. A process for preparing the image reproducing material as well as a process for preparing an image reproduced material by using the image reproducing material are also described.

Abstract: A photosensitive resin composition which is improved with respect to surface tack-free characteristic after curing by exposure to actinic radiation is disclosed. Further, there is disclosed a method of preparing a surface-tack free photocured pattern structure using the photosensitive resin composition, which enables pattern structures improved with respect to surface tack-free characteristic to be obtained in a shortened period of time.

Abstract: A process for the production of a solid, particulate immobilized extractant, which process comprises adsorbing (a) a liquid extractant which is not homopolymerizable onto (b) a porous, solid, particulate, substrate; adsorbing (c) a monomer onto the substrate; and polymerizing the adsorbed monomer (c) thereby entrapping the liquid extractant (a) on substrate (b).

Abstract: A radiation stabilized and sterilized, flexible article is comprised of a semi-crystalline polymer having a crystalline content of from twenty percent to ninety percent. This polymer has been irradiated with a sterilizing amount of high energy radiation while having incorporated therein radiation stabilizing amounts of a hindered piperidine compound a benzophenone precursor sufficient to render the article substantially resistant to radiolysis while retaining its flexibility.A method for sterilizing and radiation stabilizing a semi-crystalline polymer is also part of the present invention.

Abstract: Disclosed is an aqueous developable, photopolymerizable composition having increased flexibility and reduced cold flow comprising a unique mixture of a siliceous material and a plasticizer in combination with known photopolymerizable monomers, polymeric binders, thermal polymerization inhibitors, and photoinitiators.

Abstract: Compositions of (a) a silicone resin characterized by an intermediate region free of acrylic groups, at least 150 siloxane units long, and terminal acrylic groups; (b) at least 10% of a fumed silica filler; and (c) a photoinitiator, can be cured by UV irradiation to tough elastomeric materials useful in adhesive and sealant applications.

Abstract: An improved process for preparing a water-soluble polymer having an excellent water solubility and a high molecular weight, which comprises subjecting a thin layer of an aqueous solution of a water-soluble vinyl monomer to polymerization on a solid support, covering the thin layer with a substantially water-insoluble organic material, e.g. a paraffin, a silicone oil or a low molecular polyethylene, and/or a slightly water-soluble or substantially water-insoluble alkylene oxide adduct at least at a point of time when the aqueous monomer solution has not freely flowed, and further continuing the polymerization.

Abstract: A photopolymerizable composition which comprises as main ingredients (1) a non-gaseous ethylenic unsaturated compound which has at least two ethylenic unsaturated groups and forms a polymer by the aid of a photopolymerization initiator, (2) a thermoplastic organic polymer binder, (3) a photopolymerization initiator which is activated by activating light, and (4) a derivative of a thiohydrazide compound or at least one derivative of a carbothio acid amide. This composition forms a photoresist for producing printed circuit boards, printing plates, etc., by etching or plating. The photoresist has superior adhesion with respect to the base.

Abstract: Polymeric compositions are provided in which perfluoropolyethers have been solubilized in non-fluorinated solvents by combining them with a solubilizing agent such as azotic conjugated compounds, and phosphorylated compounds. Typical of the perfluoropolyethers is ##STR1## Typical of the solubilizing agents is phosphorylated methacryloyloxyhydroxypropylisophthalate. The perfluoropolyether and the solubilizing agent are mixed to form a paste which is soluble in organic solvents such as methylethylketone. These compositions find utility as protective lubricant coatings for thin film magnetic recording media. They have the advantage that only one coating step is required in order to apply both the phosphorylated compound and the lubricating polyether. Recording media lubricated with these compositions have demonstrated excellent wear characteristics.