Abstract: A combined chemical-/light-polymerization type composition for dental restoration consists of a formulation A composed main of a. an ethylenically polymerizable unsaturated compound, b. a photo-polymerization initiator and c. a reducing agent, and a formulation B composed mainly of d. a filler and e. an organic peroxide. The formulations A and B are separately packaged and designed to be mixed for use.

Abstract: A reactive acrylic adhesive, activated by actinic radiation, includes, in addition to a photoinitiator, at least about 1.0 percent by weight of a perester compound or cumene hydroperoxide, and 0.5 percent of a tautomeric organic acid, for enhanced bond strength.

Abstract: A visible light-curing polyester resin composition comprises an unsaturated polyester resin and a photocuring agent composed of an .alpha.-diketone, a benzyidimethyl ketal, and at least one member selected from the group consisting of (1) 2-(dimethylamino)-ethyl benzoate, (2) 2-(dimethylamino)-ethyl benzoate plus a peroxy ketal, and (3) a peroxy ketal plus a tertiaryamine.

Abstract: Compositions containing an acrylamide functional polydiorganosiloxane, a polydiorganosiloxane having methacryloxyalkyl functionality and silicon-bonded alkoxy functionality, a photoinitiator, and an organic titanate can be improved by using organic peroxides. The improvements are observed in shelf life and pot life of the uncurd composition, and the odor of the cured product. The resulting composition has ternary cure mechanisms with two of these mechanisms being available as shadow cure mechanisms, i.e. cures in areas not exposed to ultraviolet radiation by either exposure to atmospheric moisture or by heating.

Abstract: A photo-curable epoxy resin type composition which comprises (a) an epoxy resin, (b) at least one compound selected from the group consisting of (i) a compound having a group, other than an imido group, which is represented by the formula --CONH and (ii) an aromatic amine, (c) an organic metal compound, where said metal is selected from the group consisting of titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, aluminum and zirconium; and (d) an organic silicon compound having at least one group selected from the group consisting of a peroxysilyl group and an o-nitrobenzyloxy group capable of forming a silanol group by irradiation with light. The photo-curable epoxy resin type composition according to this invention is capable of readily curing by light (ultraviolet ray in particular) and also capable of heat curing at a temperature of 150.degree. C.

Abstract: A reactive acrylic adhesive, activated by actinic radiation includes, in addition to a photoinitiator, at least about 1.0 percent by weight of a perester compound or cumene hydroperoxide, and 0.5 percent of a tautomeric organic acid, for enhanced bond strength.

Abstract: A light curable dental composition is provided. The composition comprises an ethylenic unsaturated compound and a light polymerization initiator. The light polymerization initiator is a combination of an .alpha.-diketone and a polyperoxy ester containing a benzophenone group and represented by the general formula (I) of: ##STR1## wherein R.sub.1 and R.sub.1 ' represent a tertiary alkyl group or a tertiary aralkyl group and R.sub.2 and R.sub.2 ' represent a hydrogen atom, a tertiary alkoxy group or a tertiary aralkyloxy group.

Abstract: Disclosed is an easily-dyeable resin composition used in a sublimation type heat-sensitive transfer process. The composition comprises 100 parts by weight of a mixture composed of 40 to 95% by weight of a polyester resin and 5 to 60% of a crosslinking agent curable with active energy rays, and 0.01 to 12 parts by weight of a surface active agent selected from silicon-containing surface active agents and fluorine-containing surface active agents.

Abstract: The water dispersibility of water-soluble vinyl polymers, for example, polyacrylamides, is improved by incorporating a suitable surfactant in the monomer mixture from which the polymer is formed. The polymerization is effected by an initial phase of ultraviolet radiation-induced free radical polymerization until the monomer mix achieves the temperature at which chemically-induced free radical polymerization commences and then a terminal phase of chemically-induced free radical polymerization.

Abstract: An optical information recording medium is disclosed, which comprises a pair of disc-shaped substrates, at least one of the substrates having a recording layer comprising an organic dye compound on one side thereof, which are disposed so as to face each other, with the recording layer positioned therebetween, with or without a space between the two substrates, by sealing with an adhesive agent comprising an alicyclic epoxy resin component having general formula ##STR1## where R.sup.1 .about.R.sup.9 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or halogen; and R represents (CH.sub.2).sub.n, where n is an integer of 1 to 4, ##STR2## and a composite catalyst comprising a photo-decomposition organic silicon compound and a metal complex.

Abstract: The invention provides a process for the production of an image which comprises(i) applying to a substrate a layer of a liquid composition comprising(A) a cationically polymerizable residue(B) a radiation-activated polymerization initator for (A)(C) a radiation-curable residue that is different from (A) and optionally(D) a radiation activated initiator for the cure of (C),(ii) subjecting the composition to actinic radiation having a wavelength at which initiator (B) is activated but at which the residue (C) and/or initiator (D) is not substantially activated, followed by heating, if necessary, so that (A) is polymerized and the layer of liquid composition is solidified, but remains curable,(iii) subjecting the solidified layer in a predetermined pattern to actinic radiation having a wavelength that is different from that of the radiation used in stage (ii) and at which the radiation-curable residue (C) and/or the initiator (D) is activated, such that in the exposed areas (C) is substantially cured, and(iv) re

Abstract: A photocurable composition comprising (1) an epoxy compound having at least one epoxy group and at least one unsaturated double bond in the same molecule; (2) a metal compound present in an amount ranging from 0.001 to 10 wt. %, based on the epoxy compound; and (3) a silicon compound which is capable of forming a silanol group when irradiated with light and which is present in an amount ranging from 0.1 to 20 wt. %, based on the epoxy compound, is characterized by a particularly rapid curing rate.

Abstract: A photopolymerizable composition comprising a vinyl monomer, a mercaptocarboxylic acid/.alpha.-diketone photopolymerization initiator and a storage stabilizer. The composition may admit of a filler, and exhibits excellent mechanical strength, storage stability, color and resistance to coloring, and availability.

Abstract: A light curable dental liquid or paste comprises an ethylenic unsaturated monomer, a light polymerization initiator and an organic filler. The light polymerization initiator is a combination of an organic peroxide and a pyrylium salt compound of: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each represents a hydrogen atom, an alkyl group and the like, X stands for an oxygen or sulfur atom and Y for an anionic functional group.

Abstract: A combined chemical-light-polymerization type composition for dental restoration consists of a formulation A composed mainly of a. an ethylenically polymerizable unsaturated compound, b. a photopolymerization initiator and c. a reducing agent, and a formulation B composed mainly of d. a filler and e. an organic perioxide. The formulations A and B are separately packaged and designed to be mixed for use.

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: A light curable dental composition is provided. The composition comprises an ethylenic unsaturated compound and a light polymerization initiator. The light polymerization initiator is selected from a combination of an organic peroxide and a pyrylium salt compound of: ##STR1## Wherein R.sub.1, R.sub.2, and R.sub.3 each represents a hydrogen atom, an alkyl group and the like, X stands for an oxygen or sulfur atom and Y for an anionic functional group; a polyperoxy ester containing a benzophenone group; and a combination the polyperoxy ester and an .alpha.-diketone.

Abstract: The present invention provides a photosensitive resin composition used to form a top resist layer of a multilayer resist system, the composition comprising a photosensitive polyphenylsilsesquioxane represented by the following general formula (I) of: ##STR1## wherein X is selected from the group consisting of acryloyloxymethyl, methacryloyloxymethyl, and cinnamoyloxymethyl; and l, m and n are zero or positive integers but l and m do not take the value of zero simultaneously; and a bisazide compound added to act as a cross-linking agent.The photosensitive resin composition has high sensitivity to UV light and excellent resistance to reactive ion etching under oxygen gas (O.sub.2 RIE).

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include hydrogen-functional and vinyl-functional photoreactive terpolymers, which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

Abstract: A filled-resin composition useful for porcelain repair and as a dental composite and therefore made up of non-toxic materials and a method for repairing porcelain or teeth. The composition comprises a methacrylate functional resin usable in dental composites, powdered filler-colorant therein, at least one photoinitiator for the resin in an amount sufficient to initiate polymerization and complete it in depth within about half a minute when exposed to a visible-light output of at least 5,000 foot candles, the photoinitiator being an exciplex of (1) an carbocyclic ketone or acetal and (2) either ethyl-4-dimethyl amino benzoate or ethyl-2-dimethyl amino benzoate, and at least one accelerator-free peroxide curing agent for the resin in an effective amount for completing polymerization within about one-half hour of any portion of the resin not receiving sufficient light to effectuate complete cure before then.

Abstract: A photopolymerizable composition composed of a polymerizable monomer and an initiator capable of polymerizing said monomer upon exposure to visible light, characterized in that said initiator consists essentially of (a) at least one kind of photosensitizer selected from an .alpha.-diketone, quinone, and derivatives thereof, and (b) at least one kind of accelerator selected from an aldehyde containing no amino groups and derivatives thereof.

Abstract: There is disclosed a photo-curable epoxy resin type composition comprising an epoxy resin, an aluminum compound, a silicon compound having a peroxysilyl group and a photosensitizer.The compositions of the present invention can suitably be used for wide varieties of electrical applications.

Abstract: A polymerizable fluid for sealing and locking engineering parts contains components which allow 2 mechanisms of polymerization, the first of the mechanisms being initiatable by radiation such as ultraviolet light, and an opacifier such as a powder dispersed in the fluid, the opacifier rendering the fluid opaque to the radiation. A coating of the fluid is applied to one of the engineering parts and the coating is exposed to the radiation which initiates the first of said polymerization mechanisms, so that polymerization occurs only in a surface layer of the coating to form a dry tack free crust thereon. Due to the presence of the opacifier, the radiation is obstructed from passing beyond the surface layer and the subcutaneous fluid is unaffected by the radiation. The second polymerization mechanism, suitably a free radical addition polymerization of known type, is initiatable when two engineering parts are assembled together.

Abstract: In the particular embodiment described in the specification, a contact lens hydrogel is prepared by copolymerizing 75 parts of N-vinyl pyrrolidone and 23 parts of phenyl ethyl methacrylate together with allyl methacrylate as a crosslinker, t-butyl peroctoate as a thermal initiator and 2,2-dimethoxy-2-phenylacetophenone or benzoin methyl ether as a photoinitiator. The mixture is maintained at a temperature of 5.degree. C. and protected from light prior to photopolymerization which is carried out under ultraviolet radiation. The copolymer is then post-cured thermally. Cloudy or hazy hydrogels are avoided by preventing prepolymerization of the mixture.

Abstract: Novel UV-curable silicone release coating compositions and photocatalysts therefor are provided which include mercaptoalkoxyalkyl-functional polysiloxanes and vinyl-functional photoreactive terpolymers, both of which are especially compatable with certain perbenzoate ester photocatalysts. The addition of certain polyaromatic photosensitizers to enhance cure is also disclosed.

Abstract: A UV and thermally curable composition comprising(1) a liquid, ethylenically unsaturated monomer, oligomer or prepolymer of the formula: ##STR1## wherein R is H or CH.sub.3, R.sub.1 is an organic moiety and n is at least 2,(2) a thermal initiator for (1) selected from the group consisting of substituted or unsubstituted pinacols, azo compounds, thiurams, organic peroxides and mixtures thereof,(3) a photoinitiator for (1) selected from the group consisting of aldehyde and ketone carbonyl compounds having at least one aromatic nucleus attached directly to the ##STR2## group, benzoin alkyl ethers, diethoxyacetophenone and 2,2-dimethoxy-2-phenylacetophenone,(4) a thermoplastic material, and(5) a non-polymerizable plasticizer for (4).The exposure of the composition to UV radiation under atmospheric conditions and heat in seriatim results in a cured solid product which can be utilized as adhesives, coatings, gaskets, sealants, resists and the like.

Abstract: A photopolymerizable composition which comprises at least one ethylenically unsaturated polymerizable monomer, at least one selected ketone and at least one organic peroxide. The compositions are useful in the preparation of adhesives, paints and varnishes particularly in dental applications and exhibit reduced air inhibition on being cured by visible radiation in the range 400 m.mu. to 500 m.mu..

Abstract: The organopolysiloxane composition provided by the invention is very efficiently curable into a rubbery elastomer by the irradiation with ultraviolet light in the wave length region of even 300 nm or longer. The composition comprises (a) 100 parts by weight of a linear diorganopolysiloxane terminated at both molecular chain ends each with a di- or trivinylsilyl group, (b) 0.1 to 10 parts by weight of an organic peroxide and (c) 0.1 to 5 parts by weight of an aromatic ketone compound, e.g. benzophenone, which serves as a photosensitizer for the ultraviolet-induced curing.

Abstract: There is provided a method for making curable compositions containing silicon-bonded hydrogen atoms and silicon-bonded olefinic radicals, the improvement comprising adding at least one free radical type photoinitiator and at least one precious metal or precious metal-containing hydrosilation catalyst so that crosslinking is effected by two separate mechanisms. The curable compositions and articles made therefrom are also provided.

Abstract: Michler's ketone analogs and salts thereof, which are photosensitizers in water-soluble photoinitiator systems used to induce polymerization in free-radically-curable, ethylenically-unsaturated materials, are disclosed. The Michler's ketone analogs have the formula: ##STR1## wherein each R is an alkyl group of 1 to 8 carbon atoms,R.sup.1 is an alkylene group having 1 to 8 carbon atoms,Z is R.sup.1 COOH or R.sup.1 H, andn is an integer having a value of 1 or 2.The photoinitiator systems are useful in imaging systems, and additionally contain a free radical initiator compound selected from iodonium salts, biimidazoles, trialkylphosphites, alkyl peroxides, benzyl halides, alkyl nitrates, and the benzophenones other than (a).

Abstract: A light- and thermosetting resin composition comprising (a) an unsaturated epoxy ester having a resin acid value of 5 or less, or a reaction product having a resin acid value of 5 or less obtained by reacting an unsaturated epoxy ester having a resin acid value of more than 5 with a monoepoxide, (b) one or more .alpha.,.beta.-unsaturated ethylenic monomers, and (c) one or more photosensitizers and peroxides can produce insulated electrical machinery and appliances improved in reliance and performance in a short treating time.

Abstract: There is provided polysilarylene-polysiloxane copolymers comprising:(a) at least one unit of the formula ##STR1## (b) at least one unit of the formula ##STR2## and (c) at least one unit of the formula ##STR3## There are also provided curable compositions comprising the instant polymers and a cure initiator, articles having the instant compositions cured to a substrate, and methods for making the aforesaid copolymers, curable compositions and articles.