Abstract:
There is disclosed a photoresist composition comprising a light-sensitive, quinone diazide polymer, a binder and a benzene monomer trisubstituted with a diazo-naphthoquinone-sulfonyloxy group. The composition is improved in that the diazo-naphthoquinone-sulfonyloxy group occupies the 1,2,4-positions on the benzene ring, whereby improved solubility is achieved.
Abstract:
An adhesive is disclosed for use in flexible circuitry, laminates and electrical products. The adhesive has improved flexibility and adhesive properties. It may be applied in solution form or may be cast as a free-standing film which is later heated and compressed to give adhesive properties. The adhesive comprises a phenolaldehyde resin or other phenolic resin, an epoxy resin and an elastomer.
Abstract:
A material intended to form a joint between at least two bodies on the outside of their interface, at least one of the bodies being deformable, is characterized by the following features:(a) it is formed of a fluid mixture having a viscosity, measured at normal temperature, of from 0.3 Pa.s to 700 Pa.s;(b) a dry extract of the fluid mixture, measured at normal temperature and pressure, is from 20% by weight to 80% by weight, based on the weight of the fluid mixture;(c) the dry extract of the fluid mixture comprises an elastomer fraction at least 20% by weight of which elastomer fraction is formed of at least one unsaturated elastomer capable of cross-linking either at ambient temperature or by heating for a period of time of less than one minute.Methods for producing assemblies with this material, consisting, for instance, of manufacturing, repairing or recapping a tire.Assemblies obtained by these methods.
Abstract:
A spherical ion exchange resin composed of a phenolic resin and a metal hydroxide is disclosed. The metal hydroxide is enclosed and bound with the phenolic resin. A method for producing such an ion exchange resin and a method for selectively adsorbing ions using the same is also disclosed. The ion exchange resin is capable of efficiently recovering ions contained or dissolved in water in trace amounts and, hence, can be applied to any aqueous solution containing ions. For example, it can be used to recover useful substances from sea water and to purify waste waters from nonferrous refineries and nuclear power plants.
Abstract:
Method for the manufacture of a polymer with triaromatic methane units as basic building blocks, the electric conductivity of which is obtained through the formation of charge transfer complexes. Electron donors and/or electron acceptors are added to the synthetic polymer during or after its preparation, for forming charge transfer complexes.
Abstract:
Described are blends of block copolymers of polyphenylene oxides and poly(aryl ether)s, a styrene based polymer or copolymer, and a poly(aryl) ether) and/or a polyphenylene oxide.
Abstract:
A phenolic resin for application in foundry shell molding operations having improved properties is disclosed. The phenolic resin is prepared by reacting aldehydes and a mixture of bisphenol A and bisphenol F to prepare a phenolic resin for coating foundry aggregates or sand to prepare shell molds having low thermal expansion and improved shake out properties.
Abstract:
The compositions disclosed herein are suitable for thermosetting and conversion to vitreous carbon. They comprise intimate uniform mixtures of powder or otherwise blendable form of 20-80% by weight of a solid phenolic-aldehyde Novolak resin and of 20-80% by weight of a solid phenolic-aldehyde resol resin, the percentages being based on the combined weight of the Novolak and resol resins, and the aldehyde in said Novolak resin comprising at least 50 molar percent, preferably substantially 100 percent, furfuraldehyde, together with a carbonaceous filler, preferably graphite, in a proportion as high as 76% by weight based on the total composition. Generally the graphite may comprise 30-70%, advantageously 35-65% and preferably 40-60% of the molding composition. The vitreous carbon produced from these compositions have improved properties in electrical properties and in the capability of being suitably molded and carburized into large thin plates which are much more stress-free than otherwise produced. The composition may also contain 0-12 parts, preferably 0.12-8 parts hexamethylenetetramine per 100 parts of Novolak resin. The intimate mixture of these resins is advantageously made by blending resin components having a particle size of less than 40 mesh, preferably less than 100 mesh.
Abstract:
Thermoplastic blends having superior capability and homogeneity comprising a poly(phenylene oxide) resin and a resin of poly(methyl ethenyl benzene) isomers in which the predominant isomer is 1-methyl-4-ethenyl benzene, are disclosed. The poly(phenylene oxide) resin can contain substituted phenylene units and the poly(methyl ethenyl benzene) resin can be a polymer of solely methyl ethenyl benzene isomers, or a random, block or graft copolymer comprising 50 weight percent or more of methyl ethenyl benzene iosmers and up to 50 weight percent of other ethylenically unsaturated monomers.
Abstract:
A prepreg useful as the core in flame resistant cooper clad, composite, printed circuit boards is made by impregnating a porous substrate with an impregnant containing: either a brominated epoxy or epoxy resin and reactive flame retarding additive containing bromine and phenolic hydroxyl groups (e.g., tetrabromobisphenol A), phenolic novolac oligomer as curing agent, unsaturated epoxidized oil, and optionally, a suitable catalyst; and then heating the impregnated substrate to the "B"-stage.