Abstract: A photopolymerizable rubber being obtained by copolymerizing four compounds consisting of a dienic liquid rubber having hydroxyl groups, an ethylenically unsaturated monomer having hydroxyl groups, a dihydric alcohol having a molecular weight of less than 2,000 and a diisocyanate compound. The photocured product of this composition has higher tensile strength and elongation than that of the prior photopolymerizable rubbers.

Abstract: A polycarbonate dimethacrylate which is the condensation product of 2 parts of hydroxyalkylmethacrylate of the formula ##STR1## in which A is C.sub.1 -C.sub.6 alkylene, and 1 part of a bis(chloroformate) of the formula ##STR2## in which R is C.sub.2 -C.sub.5 alkylene having at least two carbon atoms in its principal chain and n is an integer from 1 to 4, is usable, admixed with a secondary monomer suitable for dental applications, such as BIS-GMA; PUDMA or the like, as an adhesive system for dental restorative materials. Particularly useful is the novel condensation product of 2-hydroxyethylmethacrylate and triethylene glycol bis(chloroformate).

Abstract: Polymer compositions having a first and second portion selected from polypropylenes, polyethylenes, propylene-ethylene copolymers and mixtures thereof having enhanced crystallization properties and a method for producing the same are disclosed. Antioxidant is mixed with the first portion, 0.01 to 1.25 wt %, of the composition which is then irradiated to a dosage of 5-30 Mrads of ionizing radiation in air to induce cross linking. The irradiated first portion is then blended with the non-irradiated second portion. The cross-linked polymer is believed to provide nucleation sites for the initiation of crystallization, thereby enhancing crystallization of the polymer as evidenced by elevated DSC freeze points. Crystallization of the polyolefin is enhanced without any detrimental effects on hexane or xylene extractability of the polymer and without degrading the composition to any appreciable extent.

Abstract: UV-crosslinkable materials based on (meth)acrylate copolymers and containing special modified unsaturated benzophenone derivatives as copolymerized units are used as hotmelt adhesives, for coating sheet-like mineral substrates and as surface coatings.

Abstract: This invention relates to a coating composition which can be cured by exposure to radiation energy in the presence of a cationic photoinitiator. The composition comprises a mixture of between about 1 and about 75 wt. % of a reactive vinyl or alk-1-enyl ether cyclocarbonate having the formula ##STR1## wherein R is hydrogen or lower alkyl; R' is C.sub.2 to C.sub.4 alkylene; n has a value of from 0 to 4 and n' has a value of from 1 to 4 and between about 99 and about 25 wt. % of a polymerizable compound containing an onium salt initiator which is normally insoluble in said polymerizable compound or a mixture thereof. The invention also relates to the use of the composition as a protective coating on a substrate.

Abstract: A light-sensitive composition which comprises at least one compound represented by the following general formula (I) as light-free radical generator:S-L-A (I)in formula (I), S represents a light absorbing moiety which absorbs light having a wave length of not less than 300 nm with an absorptivity coefficient of not less than 1000, A represents an active moiety which interacts with the light absorbing moiety S in an excited state to generate free radicals and L represents a group for coupling the moieties S and A; and a photopolymerizable composition which comprises at least one radical polymerizable compound having ethylenically unsaturated group, at least one compound represented by the foregoing general formula (I) as a light-free radical generator and optionally at least one linear organic high molecular weight polymer.

Abstract: A photocurable compound prepared as a starting material by incorporation therein of a composition comprising a fluorescein compound photoreducing dye, tribenzylamine, and at least one specific peroxide permits production of a shaped article which, on exposure to visible light, exhibits high curability and acquires hardness virtually indiscriminately on the obverse and reverse sides of the article. A mixture comprising both or either of an unsaturated polyester resin and an epoxy acrylate resin which are photocurable compounds, glass fibers, and a specific peroxide, is convenient for the production of specific cured shaped articles particularly by the filament winding technique or the drawing technique.

Abstract: Radiation-sensitive, ethylenically unsaturated compounds and a process for their preparation. The ethylenically unsaturated organic compounds are of the general formula ##STR1## where R is alkyl, aryl or a radical R.sup.1 andR.sup.1 is a radical ##STR2## where R.sup.2 to R.sup.6 are each H, alkyl, OH, OAlkyl, SH, SAlkyl, halogen, N (Alkyl).sub.2 or N (Alkyl) (Aryl) and at least one but not more than three of the radicals R.sup.2 to R.sup.6 is or are a radical ##STR3## where X is alkylene, cycloalkylene, oxaalkylene or arylene, Y is H or CH.sub.3 -- and Z is O or NY.The novel radiation-sensitive ethylenically unsaturated compounds are suitable for the preparation of polymeric radiation-sensitive compounds.

Abstract: A process of producing a water absorptive resin, wherein a water absorptive polymer which comprises cross-linked poly(metal salt of acrylic acid) as a major component is impregnated with water, and the water-impregnated water absorptive polymer is exposed to one of a high-temperature highly-humid atmosphere or a ultraviolet radiation, to thereby partially release the cross-linkage of the cross-linked poly(metal salt of acrylic acid).

Abstract: Xanthate, dithiocarbamate and dithiophosphate salts of transition metals, together with a coinitiator selected from organic halogen and tertiary amine compounds provide light activated initiator systems for radically polymerizable ethylenically unsaturated compounds such as (meth)acrylate esters.

Abstract: Energy polymerizable compositions comprising at least one cyanate monomer and as curing agent an organometallic compound are disclosed. The compositions are useful in applications requiring high performance, such as high temperature performance; in composites, particularly structural composities; structural adhesives; tooling for structural composities; electronic applications such as printed wiring boards and semiconductor encapsulants; graphic arts; injection molding and prepregs; and high performance binders.

Abstract: A process for producing a rubber product by vulcanizing a molded article composed of a rubber composition containing a peroxide as a crosslinking agent in the presence of oxygen, wherein said molded article is irradiated with electron beams, is disclosed. The rubber article produced by the invention is not sticky on the surface and exhibits excellent tensile properties.

Abstract: Resin compositions comprising 20 to 50% by weight, based on total composition weight, of a first resin which comprises an acrylate-epoxy oligomer having a molecular weight of from 2000 to 5000; from 2 to 10% of a second resin which comprises an acrylate-urethane oligomer; up to 50% of a third resin which comprises a second acrylate-epoxy oligomer, where from 1 to 5% of the epoxy is an epoxy novolac; from 10 to 40% of a liquid acrylate; from 2 to 20% of a liquid diacrylate having an ether linkage; from 5 to 25% of a liquid alkylene diacrylate; and from 1 to 5% of a UV photoinitiator. The compositions also preferably includes from 0.05 to 1% of a flow control agent. The compositions are applied to substrates such as printed wiring boards and cured with ultraviolet light to form a conformal coating on the substrate.

Abstract: A process for texturing a coating via exposing a photocurable composition comprising a multifunctional urea compound, an ethylenically unsaturated compound, and an aromatic ketone photosensitizer that functions through a hydrogen abstraction mechanism when exposed to ultraviolet light.

Abstract: A photocurable resin composition for glass lamination, consisting essentially of a radical polymerizable monomer having at least one repeating units of ethylene oxide in its molecule and terminated with allyl, acrylate or methacrylate groups, and a photopolymerization initiator, a cured product of which has a volume resistivity of less than 5.times.10.sup.9 .OMEGA..multidot.cm. Addition of a polythiol provides an ene/thiol cure.

Abstract: A pressure sensitive adhesive is prepared by the polymerization of an appropriate acrylic ester formulation of the type that includes an ethylenically unsaturated monomer having a polar group, and at least part of such polymerization is accomplished by photopolymerization using a source of ultraviolet radiation that provides a substantial portion of its ultraviolet radiation in the wavelength band of from about 280 to about 350 nm and a light intensity at the surface of the formulation being polymerized of no more than about 4.0 milliwatts/cm.sup.2.

Abstract: Tris(norbornenyl) isocyanurate compounds of the formula: ##STR1## wherein R.sup.1 is either H or methyl group, are prepared from the base-catalyzed trimerization of norbornenyl isocyanate. Tris(norbornenyl) isocyanurate is suitable for use as a crosslinker in thiol-ene formulations containing a difunctional thiol oligomer or in systems containing norbornene-difunctional oligomers and polyfunctional thiols, producing improved high temperature properties for the cured compositions.

Abstract: Agents which are curable by ultraviolet radiation are based on a binder formulation of (1) from 99.0 to 20% by weight of a copolymer, (2) from 1.0 to 80% by weight of monoolefinically unsaturated compounds and (3) from 0.0 to 20% by weight of polyolefinically unsaturated compounds. The agents contain copolymers (1) which are obtainable by subjecting a mixture of (A) from 80 to 99.9% by weight of olefinically unsaturated monomers, (B) from 0 to 10% by weight of a copolymerizable olefinically unsaturated photoinitiator and (C) from 0 to 10% by weight of a polymerization-regulating photoinitiator to free radical polymerization, the sum of (B) and (C) being not less than 0.1% by weight and the stated percentages by weight being based on the sum of the weights of (A)+(B)+(C).

Abstract: A process for the preparation of an oriented homo- or co-polyalkene material of improved strain rate sensitivity, which process comprises subjecting the oriented homo- or co-polyalkene material having a weight average molecular weight (M.sub.w).ltoreq.350,000, a number average molecular weight (M.sub.n).gtoreq.5,000, and a 2% secant modulus of at least 10 GPa at a strain rate of 2.times.10.sup.-5 sec.sup.-1 to a high energy irradiation of a dosage of at least 1 Mrad and not more than 60 Mrads at an elevated temperature in vacuo or in an inert or sensitizing atmosphere.

Abstract: A photocurable composition based on a cycloaliphatic polyepoxide, a poly(tetramethylene oxide)polyol and photoinitiator; and a printed circuit board having as a conformal coating thereon, the cured product of the photocurable composition.