Abstract: A method is disclosed for the preparation of ceramic materials or articles by the pyrolysis of preceramic polysilanes wherein the preceramic polysilanes are rendered infusible prior to pyrolysis by exposure to ultraviolet irradiation in the presence of a reactive gas selected from the group consisting of ethylene, 1,3-butadiene, 2-methyl-1,3-butadiene, 1,4-pentadiene, silane, chlorosilane, dichlorosilane, boron trichloride, oxygen and water mixture, acetylene, and tetravinylsilane. This method is especially suited for the preparation of ceramic fibers. The ceramic fiber's surface properties can be modified by the practice of this invention; for example, a ceramic fiber with a carbon rich surface layer can be obtained when 1,3-butadiene is used as the reactive gas.

Abstract: The present invention relates to a negative photoresist consisting essentially ofa) at least one solid film-forming polyphenol,b) at least one compound which contains at least two epoxide groups or at least two vinyl ether groups or at least one epoxide and vinyl ether group in the molecule,c) at least one cationic photoinitiator for component b) andd) if appropriate customary additives.The resist can be developed under aqueous-alkaline conditions.

Abstract: An aqueous base developable negative resist composition comprising a phenolic resin, a radio-chemical acid generator and a small molecule which upon irradication and postbake reacts with the phenolic resin to decrease its rate of dissolution.

Abstract: Compositions which cure by UV radiation in less than one second are obtained by mixing an alkenyl containing polydiorganosiloxane, a mercapto functional crosslinker of the mercapto functional polyorganosiloxane or mercapto organic compounds, a photosensitizer, a viscosity stabilizer, and optionally a reinforcing agent. These compositions can be packaged in one container and can be used as the primary coating for optical fibers.

Abstract: A method for preparing branched novolak polymers possessing excellent lithographic performance is provided. The method involves the acid catalyzed reaction of a phenol with a tris- or tetrakis(dialkylaminoalkyl)phenol followed by purification of the reaction product. The branched novolaks are soluble in aqueous base and organic solvent solutions and are particularly useful as the polymeric component of either positive acting or negative acting photoresist compositions.

Abstract: An optical information recording medium is disclosed which comprises a pair of substrates at least one of which has a recording layer on one side thereof and which are placed opposingly to each other so that said recording layer is positioned on the inside and are bonded to each other by adhesive layer(s) with or without spacer(s) therebetween to form a sealed structure, wherein said adhesive layer is composed of a cured adhesive material formed from (a) an epoxy resin, (b) a photolyzable organosilicon compound and (c) an aluminum complex compound, said photolyzable organosilicon compound being a silicon compound having at least one phenyl group which has at least one fluorine atom and at least one o-nitrobenzyloxy group which may have a substituent.

Abstract: Compositions which cure by UV radiation in less than one second are obtained by mixing an alkenyl containing polydiorganosiloxane, a mercapto functional crosslinker of the mercapto functional polyorganosiloxane or mercapto organic compounds, a photosensitizer, a viscosity stabilizer, and optionally a reinforcing agent. These compositions can be packaged in one container and can be used as the primary coating for optical fibers.

Abstract: A resin composition of excellent ultra-violet ray curing property and remarkably improved adhesive force to a base material to form a cured coating film, the resin composition being composed of cationically polymerizable compound, photo-initiator, phenoxy resin, and polyhydric alcohol.

Abstract: The present disclosure is concerned with self-adhesive sheet-like structures made by adhering an adhesive polyurethane gel material to a supporting substrate and the utilization of such structures in the medical field to adhere materials such as plasters, wound dressings and appliances to the human body, and in other fields to connect articles, such as the parts of a fractured or cracked object, to one another by means of an adhesive bond. The gel is formed by immobilizing a high molecular weight polymeric polyol in the matrix of a covalently crosslinked polyurethane which is prepared by reacting polyisocyanates having an isocyanate functionality of at least 2 with higher molecular weight polyhydroxyl compounds having a hydroxyl functionality of at least 3. These reactants are selected in accordance with the following formula which relates the isocyanate number, K, (isocyanate to hydroxyl equivalents ratio times 100) to the average functionalities of the polyisocyanates (F.sub.

Abstract: This invention relates to a thermosetting plastisol dispersion composition comprising(1) poly(phenylene oxide) (PPO) in powder form, which is insoluble in the reactive plasticizer at room temperature and plasticizable at a temperature at or above the fluxing temperature;(2) a liquid reactive plasticizer member of the group consisting of (a) at least one epoxide resin having an average of more than one epoxide group in the molecule, (b) at least one liquid monomer, oligomer or prepolymer containing at least one ethylenically unsaturated group and (c) a mixture of (a) and (b); said liquid reactive plasticizer being capable of solvating the PPO at the fluxing temperature and being present in an amount ranging from 5 to 2,000 parts per 100 parts by weight of (1); and(3) 0.01 to 10% by weight of (2) of either a thermal initiator or photoinitiator for plasticizers present in the composition.The plastisol dispersion after fluxing can form a thermoset after the crosslinking reaction.

Abstract: This invention is directed to photocopolymerizable compositions comprising an epoxide containing two or more epoxy groups, a polymer/poly (active hydrogen) organic compound and a photoinitiator. The cured coating compositions exhibit a clear appearance, good water resistance and can have utility as automotive finishes, can finishes, appliance finishes, general metal finishes, adhesives, printing inks, and the like.