Abstract: A laser beam absorbing resin composition adaptable for laser marking, and a markable article formulated from such resin composition is provided. The composition includes at least a urea-based thermosetting resin, a cellulose reinforcement, and titanium dioxide. The titanium dioxide is preferably present in a concentration of at least about 1.5 wt % of the composition, more preferably in a range of at least about 1.5 wt % to at most about 5 wt % of the composition, and most preferably in a range of at least about 2 wt % to at most about 5 wt % of the composition.

Abstract: The object of the present invention is polycarbonate molding compositions containing polycarbonates, stabilizers of the general formula (I)R.sub.1 --X--CZ--Y--R.sub.2and optionally polypropylene glycols. The object of the present invention is also use of these molding compositions to produce items for medical applications.

Abstract: A thermoplastic polycarbonate molding composition resistant to ionizing radiation is disclosed. Accordingly, a composition containing a polycarbonate resin and an effective amount of an ester based on an aromatic carboxylic acid and at least one member selected from the group consisting of secondary alcohol, benzyl alcohol and tertiary alcohol was found to be resistant to the yellowing which characterizes polycarbonate compositions exposed to ionizing radiation.

Abstract: The present invention relates to polycarbonate molding compositions containing polycarbonates, stabilizers of general formula ##STR1## and optionally polypropylene glycols. The present invention also relates to the use of these molding compositions for the production of articles for medical applications.

Abstract: An improved thermoplastic molding composition containing polycarbonate and a polyester copolymer based on cyclohexane-dimethanol, ethylene glycol and phthalic acid is disclosed. Improved resistance to gamma-radiation results from the incorporation of a siloxane compound which contains an oxirane group.

Abstract: Disclosed are compositions suitable for use in embolizing blood vessels which compositions comprise an ethylene vinyl alcohol copolymer, a biocompatible solvent and a water insoluble contrasting agent selected from the group consisting of tantalum, tantalum oxide and barium sulfate. Also disclosed are methods for embolizing a blood vessel using the compositions described herein.

Abstract: The present invention provides polycarbonates stabilized against .gamma.-radiation and their use for the production of medical equipment.

Abstract: Provided are methyl methacrylate polymers admixed with particular polyalkylene glycols, ethers or esters, optionally with BHT, which show good chemical resistance, as well as maintenance of optical properties and minimal yellowing on exposure to sterilizing gamma radiation.

Abstract: Thermoplastic compositions are stabilized with a phosphite of the formula: ##STR1## wherein Y.sup.1 is an alkyl and Y.sup.2 is selected from tert-butyl and sec-butyl. The phosphite is particularly effective for thermoplastics irradiated with high energy gamma-radiation. Irradiated articles made with the phosphite stabilized thermoplastic compositions exhibit improved discoloration resistance compared to various other phosphite stabilized thermoplastic compositions.

Abstract: Radiation resistant, gadolinium oxide modified, thermoplastic polymers which may be used for containing nuclear waste.

Abstract: The invention is a radar absorbing material and a process for making same. In detail, the invention includes a binder material containing a mixture of two groups of spheres made of a magnetic material, The first group of spheres have an average diameter and the second group have an average diameter generally 0.73 times the average diameter of the spheres of the first group. The first and second group contain generally equal numbers of spheres. The amount of the binder material incorporated is sufficient to both bind mixture together while maintaining the individual spheres separated from each other. The process involves the steps of: providing a first group of spheres made of a magnetic material; providing a second group of spheres made of a magnetic material containing a number of spheres equal to the number of spheres of the first group with an average diameter of generally 0.

Abstract: This invention provides flexible compositions which have 20-90% by total weight of composition of a filler selected from the group consisting of barium sulfate, zinc oxide, zirconium oxide, zirconium silicate and mixtures thereof, and a thermoplastic resin, which when filled with 20-90% by total weight of composition of the filler, has a flexural strength of less than 7500 psi.

Abstract: An improved thermoplastic molding composition containing polycarbonate and a polyester copolymer based on cyclohexane-dimethanol, ethylene glycol and phthalic acid is disclosed. Improved thermal stability and resistance to gamma-radiation results from the incorporation of a phosphite conforming to ##STR1## where n, m, p and r are integers, and where R is H, an alkyl or an aryl group and R.sub.3 denotes an alkyl or aryl group.

Abstract: The invention relates to the use of nucleus-brominated phthalic acid derivatives, optionally in combination with polyalkylene oxides corresponding to formula (V) ##STR1## in which R is H, C.sub.1-6 alkyl, tetrahydropyranyl or a silyl group,R' is H or C.sub.1-6 alkyl andx is an integer of 1 to 100,for stabilizing thermoplastic polycarbonates against the effect of .gamma.-rays.

Abstract: Esters and polyesters which contain disulfide linkages were found to be effective stabilizers of polycarbonate resin. Accordingly, a polycarbonate composition containing disulfide esters, alone or as a coadditive with a polyether is rendered more resistant to the deterioration resulting upon exposure to gamma radiation.

Abstract: A laser beam absorbing resin composition is disclosed which includes 100 parts by weight of a resin, and 1-100 parts by weight of composite particles having an average particle diameter of 0.1-50 .mu.m and each including a particulate, laser beam absorbing inorganic substance, and a colorant physically bonded directly to the inorganic substance and capable of discoloring upon being heated at a temperature of 250.degree. C. or more, the weight ratio of the colorant to the inorganic substance being in the range of 1:99 to 50:50. By irradiating a shaped, hardened body of the above composition with a laser beam, the colorant is thermally decomposed, so that the color of the irradiated surface is changed and becomes discriminative from that of non-irradiated surface.

Abstract: A gamma radiation-resistant polycarbonate-disulfide resin is disclosed. The incorporation of disulfide linkages in the structure of polycarbonate was found to enhance the resistance of the resin to the discoloration caused by exposure to gamma radiation. Accordingly, processes for the incorporation of disulfide linkages in the molecular backbone, as end-groups or as side chains are disclosed. The polycarbonate-disulfide resin may be used as a molding resin in the context of thermoplastic molding compositions as well as a stabilizing additive in polycarbonate resin.

Abstract: A thermoplastic molding composition resistant to the degradation induced by ionizing-radiation is disclosed. The composition contains an aromatic polycondensate and an agent which is a compound conforming structurally to formula (I) ##STR1## or which is a member selected from the group consisting of oligocarbonate, polycarbonate, copolycarbonate, polyestercarbonate and polyesters which contain structural units conforming to formula (Ia) ##STR2## wherein R.sup.1 to R.sup.10 and X are defined. The composition is suitable for the manufacture of shaped articles, especially articles useful in medical applications.

Abstract: For the reduction of the radon load in enclosed spaces, an aqueous, solvent and softener-free dispersion of a vinylidene chloride-acrylate-copolymer is applied to the boundary surfaces of the room and left to dry. The dispersion contains also a nonionic surfactant on a base of alkylphenolethoxylate with a proportion of 10 mole ethylene oxide, a vinyl pyrrolidone-copolymer and a defrothing agent.

Abstract: A thermoplastic polycarbonate molding composition which is rendered resistant to deterioration induced by exposure to gamma radiation is disclosed. The composition is imparted an improved degree of color stability upon the incorporation of a minor amount of a poly(alkylene oxide) oligomer and a halogenated aromatic acid derivative therewith. In addition, the composition is characterized by its low initial color and the small change in its yellowness index after a waiting period of several weeks.

Abstract: A thermoplastic polycarbonate molding composition comprising a polycarbonate resin and a stabilizing agent is disclosed. Containing (i) a polyether polyol and (ii) an aromatic disulfide, the agent imparts to the composition improved resistance to gamma-radiation-induced color change. Articles molded from the composition of the invention are suitable for the preparation of gamma-radiation sterilizable medical equipment.

Abstract: A thermoplastic polycarbonate molding composition resistant to gamma-radiation is disclosed. The composition incorporates about 0.05 to 5.0 percent by weight of and end-capped poly(alkyl oxide) conforming to ##STR1## where hal denotes bromine or chlorine, n is about 10 to 40 and x is 1 to 5.The composition was found to be resistant to the yellowing which characterized polycarbonate compositions upon exposure to gamma radiation. The composition of the invention not only has low initial color change upon exposure but also a small change in yellowness after long term storing.

Abstract: A microporous particulate-filled thermoplastic polymeric article is provided. The article can be in the form of a film, a fiber, or a tube. The article has a thermoplastic polymeric structure having a plurality of interconnected passageways to provide a network of communicating pores. The microporous structure contains discrete submicron or low micron-sized particulate filler, the particulate filler being substantially non-agglomerated.

Abstract: A polycarbonate resin composition for radiation sterilization, comprising an aromatic polycarbonate resin having structural units derived from a halogenated bisphenol, and a polyalkylene compound selected from poly(alkylene glycol), its ether, silyl ether or ester. Molded articles produced from the composition do not substantially undergo yellowing when exposed to radiation in air or under a substantially oxygen-free atmosphere, and can be advantageously employed in medical appliances.

Abstract: A radiation-resistant high molecular composition is disclosed, charqacterized in that, to the high molecular polymer, a halogenated acenaphtylene and/or condensates thereof represented by a following general formula [I] ##STR1## (wherein, X indicates a chlorine or bromine atom, a indicates 0 to 2, b indicates 1 to 6 and n indicates an integer not less than 1) and a diphenyl ether derivative represented by a following general formula [II] ##STR2## (wherein, R.sub.1 and R.sub.2 indicate any ones of hydrogen atom, alkyl, alkoxy, phenyl phenoxy, diphenyloxy and terphenyloxy group) and/or basic lead compound are formulated.

Abstract: The invention relates to thermoplastic molding compositions comprising a polycarbonate resin which is rendered resistant to gamma radiation induced yellowing. It was surprisingly found that the incorporation in the resin of an effective amount of benzylic alcohol or its derivatized versions renders the composition resistant to yellowing. The composition of the invention is suitable for the preparation of molded articles having improved resistance to yellowing and to the formation of haze induced upon exposure to gamma radiation.

Abstract: Compounds having defined functional groups are described which color stablize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to steriliizing radiation.

Abstract: Compounds having defined functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined alkene functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined thioether groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: A radiation-resistant high molecular composition is disclosed, characterized in that, to the high molecular polymer, a halogenated acenaphtylene and/or condensates thereof represented by a following general formula [I] ##STR1## (wherein, X indicates a chlorine or bromine atom, a indicates 0 to 2, b indicates 1 to 6 and n indicates an integer not less than 1) and a diphenyl ether derivative represented by a following general formula [II] ##STR2## (wherein, R.sub.1 and R.sub.2 indicate any ones of hydrogen atom, alkyl, alkoxy, phenyl phenoxy, diphenyloxy and terphenyloxy group) and/or basic lead compound are formulated.

Abstract: Compounds having defined nitrogen containing functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined triazine functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds havign defined ketone functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: Compounds having defined sulfone functional groups are described which color stabilize aromatic carbonate polymers or blends therewith upon exposure to sterilizing radiation.

Abstract: The invention relates to thermoplastic polycarbonate molding compositions which are rendered improved resistance to gamma-radiation by the incorporation therewith of about 0.05 to about 5.0 percent by weight of an ester of poly(alkylene)oxide conforming to ##STR1## wherein R is a C.sub.1 -C.sub.20 alkyl, aryl or alkylaryl, Y denotes a hydrogen atom or a C.sub.1 -C.sub.6 alkyl radical, and X is about 1 to 40, preferably 5 to 30.The compositions of the invention exhibit excellent resistance to yellowness and formation of haze which commonly characterize gamma irradiated articles molded from polycarbonate.

Abstract: In a packaging case for photosensitive sheet film comprising a light-shielding tray which receives a stack of said photosensitive sheet films and a light-shielding flexible cover sheet which is stuck in peelable state to seal the opening for taking out said stack, the improvement comprising that said tray is made of resin comprising 50 to 90 wt. % of a propylene-.alpha.-olefin copolymer resin having a melt index of higher than 18 g/10 minutes, a bending elastic modulus of more than 9,000 kg/cm.sup.2 and a notched Izod impact strength of more than 2.0 kg cm/cm at 23.degree. C., 0.2 to 5.0 wt. % of carbon black and 9.8 to 49.8 wt. % of linear low density polyethylene resin.In the light-shielding tray of the invention, rigidity is secured by the propylene-.alpha.-olefin copolymer resin, and troubles caused by this copolymer resin such as mold shrinkage, warp and twist of the product are overcome and remarkable lowering of physical strength by blending carbon black are attained by incorporating the L-LDPE resin.

Abstract: Radiation-sensitive material for use in dosimetry comprises a matrix base, an acid-sensitive dye such as dimethyl yellow, and a halogen-containing substance, the material being capable of producing a halo-acid upon radiolysis. The matrix base is a solid polymer such as poly(methyl methacrylate) and the halogen-containing substance is a solid in which the polymer is insoluble such as hexachloroethane so that the radiation-sensitive material is a solid, self-supporting plastics material.

Abstract: A pliable and elastic foamed material containing a large quantity of metallic grains or particles comprising a foamed rubber matrix and metallic grains or particles contained in said matrix in the amount of not less than the parts by weight of said rubber matrix, said foamed rubber matrix being composed of a mixture of 100 parts by weight of a first rubber material of a number-average molecular weight of more than 100,000 and 40 to 45 parts by weight of a second rubber material of a number-average molecular weight of from 2,000 to 12,000.

Abstract: A product and method for obtaining a radiation-resistant polyolefin-containing product, by handling and processing the corresponding homopolymer or copolymer melt and resulting extrudate in a manner favoring retention of a high smectic and less than about 20 wt % monoclinic configuration.

Abstract: A composition sufficiently irradiated to achieve sterilization comprising a polysulfone resin in admixture with an anti-yellowing upon exposure to sterilizing irradiation effective amount of a boron compound having as part of its structure at least one ##STR1## group wherein R.sup.3 is selected from monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals, monovalent hydrocarbonoxy radicals, or halogen radicals, and R.sup.4 is selected from divalent hydrocarbon radicals or substituted divalent hydrocarbon radicals.

Abstract: An alanine dosimeter that enables accurate and simple measurement of the absorbed dose of an ionizing radiation is disclosed. The dosimeter uses as an alanine binder agent at least one member selected from among synthetic rubbers, and natural rubber.

Abstract: Carbonate polymer compositions are rendered gamma ray resistant by the incorporation of 0.1 to 10 percent by weight of the esters of aromatic polycarboxylic acids such as terephthalic, isophthalic, phthalic, trimellitic, hemimellitic, trimesic, and prehnitic acids with the monoalkyl or monoaryl ethers of polyglycols. The compositions have reduced yellowing after exposure to cobalt 60 radiation.

Abstract: A shielding material for use in such as endotracheal tubes during laser beam surgery comprising a dispersion of particulate graphite in a polymer matrix.

Abstract: A radiation shield superior to lead in absorbing/attenuating X-rays and the like made by molding with a resin binder a mixture of powders, namely lead oxide derived from scrap storage batteries, slag derived from electrorefining of aluminum, nickel or chromium as a by-product, and molybdenite. The molded shield may also contain zeolite for gas absorption and a reinforcing core of glass fabric.

Abstract: Compositions based on vinylidene fluoride polymers incorporating boron carbide coated with an acrylic polymer, preferably with the use of an anchor coating consisting of a complex of a polyhydroxylated polymer and a transition metal cation.The compositions are especially suitable for the manufacture of shaped articles intended to be employed in the nuclear field for neutron thermalization. No figure.