Abstract: An optically transparent hydrogel forming material comprising a copolymer of an optically transparent polyester having a molecular weight of 1,000 to 100,000 and at least one of polymerizable group in its molecule and N-vinyllactam. The hydrogel forming material has an excellent optical property, high gas-permeability and excellent mechanical property.

Abstract: A transparent aromatic polyimide produced by polymerization and imidation of an aromatic tetracarboxylic acid containing as a principal component biphenyltetracarboxylic acid and an aromatic diamine containing as a principal component bis(aminophenoxy-phenyl)sulfone of the formula (I) or bis(aminophenoxy-phenyl)propane of the formula (II): ##STR1##

Abstract: Flame-retardant polyurethane foam having a very good skin weldability and a very low level of skin staining is produced from a polyhydroxy compound, organic polyisocyanate, blowing agent, catalyst, foam stabilizer, and flame retardant, and other additives, wherein the flame retardant contains a triaryl phosphate ester and the polyhydroxy compound is a mixture composed of 100 parts by weight of high-molecular-weight polyhydroxy compound having a hydroxyl number lower than 100 and 0.5 to 10 parts by weight of low-molecular-weight polyhydroxy compound having a hydroxyl number higher than 560 and having 2 to 4 hydroxyl groups in one molecule.

Abstract: New heat resistant, thermoplastic copoly)ester-carbonates) based on 3-methyl-4-hydroxy-benzoic acid are disclosed. The copolymers exhibit higher glass transition temperatures due to the presence of the 3-methyl substituent on the benzoate units of the polymer. They are useful in the preparation of thermoplastic engineering compositions for extrusion or molding into shaped articles.

Abstract: The invention describes a process for the preparation of N,o-substituted mono- and/or polyurethanes of formulaR.sup.1 [--NHCOOR.sup.2 ].sub.n,in whichR.sup.1 is an aliphatic, cycloaliphatic, aromatic, araliphatic, or heterocyclic radical, which may be substituted,R.sup.2 is an aliphatic, cycloaliphatic, or araliphatic radical which may be substituted with alkoxy or polyoxyalkylene groups, andis a whole number from 1 to 5,through the reaction of N-substituted allophanates and/or polyallophanates with alcohols R.sup.2 OH in the presence or absence of catalysts at temperatures of at least 160.degree. C., preferably from 165.degree. to 250.degree. C.

Abstract: A polymeric or plastic coating is provided which protects coated structures by forming an intumescent insulative fire resistant barrier. The coating is formed from the product of mixing an aromatic polyisocyanate, an aromatic polycarboxylic compound and about 1 to about 20% by weight of furfuryl alcohol. The structure to be protected is coated with the product of the mixture and the coating is dried. An intumescent polyimide fire resistant foam is formed when the coating is exposed to a (non-flame) heat source at temperature ranging from about 110.degree. C. to about 140.degree. C.

Abstract: Homopolycondensates and copolycondensates of the group comprising linear, saturated polyamides, polyesters, polyamide-imides, polyester-imides and polyester-amides based on benzophenonedicarboxylic acids and benzophenonetricarboxylic acids are radiation-sensitive and are particularly suitable for the production of protective coatings and relief images.

Abstract: Graft polymer dispersions in polyoxyalkylene polyether polyols are employed together with flame retardant compounds to prepare flame retardant polyurethane foams. The polymer dispersions employ less than 0.1 mole of induced unsaturation per mole of polyol mixture. Processes for the preparation of these polymer dispersions employ fumarate derived polyetherester polyols or polyetherester polyols prepared by reacting a polyoxyalkylene polyether polyol with a compound selected from the group consisting of maleic acid, maleic anhydride and fumaric acid and an alkylene oxide in the presence of salts and oxides of divalent metals. The polymer dispersions are prepared in the presence of a reaction moderator and employ 50 weight percent or more of acrylonitrile.

Abstract: Described herein are novel bismaleimides and prepregable resin compositions comprising these bismaleimides and one or more liquid coreactants and optionally, one or more other additives.

Abstract: The invention relates to a process for the preparation of compounds of the formula I ##STR1## in which R represents hydrogen, alkyl or aralkyl, and R.sup.1 to R.sup.6 denote identical or different radicals hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, cycloalkenylalkyl, aralkyl or aryl, both being monosubstituted, disubstituted or trisubstituted in the aryl moiety by alkyl, alkoxy, hydroxyl, halogen, nitro, methylenedioxy and/or cyano, or in which two of the radicals R.sup.1 to R.sup.6, together with the carbon atom(s) bearing them form a monocyclic or bicyclic ring system, and the remaining radicals are hydrogen, which process comprises converting, with an oxidizing agent in the presence of a silver salt, a pyrrolidine derivative of the formula II into a .DELTA..sup.1 -pyrroline derivative of the formula III, reacting the latter with hydrogen cyanide or a metal cyanide to form a nitrile of the formula IV, and subjecting the latter to solvolysis with a compound of the formula ROH.

Abstract: A vibration isolator composed of a low foam urethane elastomer having urethane bonds and a bulk density of 0.4-0.75 g/cm.sup.3 which is prepared from the starting foamable liquid of urethane elastomer composed substantially of(a) a polyether polyol having an average number of functional groups of 2.5-4.5 and a number average molecular weight of 2000-3500,(b) a vinyl monomer-grafted polyol having an average number of functional groups of 2.5-4.0 and the graft ratio is 4-20% by weight,(c) a liquid polybutadiene polyol having hydroxyl terminal group(s), an average number of functional groups of 2.0-3.0 and a number average molecular weight of 2000-7000,(d) an organic polyisocyanate,(e) a chain extender(f) a blowing agent, and(g) a urethanation catalyst,in such ratios that the NCO index is within the range of 90-110, and the concentration of the chain extender, based on the total amount of the five components of (a), (b), (c), (d) and (e), is 0.3.times.10.sup.-3 to 1.5.times.10.sup.-3 mol/g.

Abstract: White graft polymer dispersions in polyoxyalkylene polyether polyols are employed together with flame retardant compounds to prepare flame retardant polyurethane foams. The polymer dispersions employ less than 0.1 mole of induced unsaturation per mole of polyol mixture. Improved processes for the preparation of these polymer dispersions employ either maleate or fumarate derived polyetherester polyols or polyetherester polyols prepared by reacting a polyoxyalkylene polyether polyol in the presence of a chain transfer agent with a compound selected from the group consisting of maleic acid, maleic anhydride and fumaric acid and an alkyklene oxide in the presence of salts and oxides of divalent metals.

Abstract: This invention relates to a polyimide powder in use for adhesion and/or coat forming and to a method of preparing said powder, wherein polyamic-acid is chemically imidized which is obtained by reacting tetracarboxylic acid dianhydride with diamine in organic solvents.This invention further relates to a method for adhesion and coat forming by using said polyimide powder.This invention still further relates to a method for preparing prepreg by using said polyimide powder, and a method for adhesion and preparing molded laminates by using said prepreg.

Abstract: A novel polymeric binder for use in an antifouling paint includes an acrylic or methacrylic ester monomer having selected substituted aryl or arylalkyl substituent groups in the ester moiety so that the ester is hydrolyzable at a suitable rate in seawater, and a copolymerizable ethylenically unsaturated monomer unit.

Abstract: An adhesive mixture comprising a multiplicity of contiguous deposits of a curable but uncured fluid resin and a fluid curing agent for the resin, said deposits being separated by a thin flexible barrier film of cured resin resulting from the interaction between the resin and curing agent.

Abstract: A process for producing a hydrocarbon resin which comprises polymerizing, by means of a Friedel-Crafts catalyst, a mixture of (1) a residual fraction obtained by polymerizing a fraction of a boiling point range of from 140.degree. to 280.degree. C. obtained from the decomposition of a petroleum and containing unsaturated hydrocarbons and removing the resulting polymer and (2) phenol and/or a phenol derivative.

Abstract: A method and apparatus for purifying, devolatilizing and/or sheeting a thermoplastic material in which a high density, flowable heat exchange material, having a density substantially above the density of the thermoplastic material and which is essentially immiscible therewith, is continuously circulated through a contact zone in a manner to maintain an extended surface area body of the high density heat exchange material in the contact zone, the thermoplastic material is introduced into and withdrawn from the contact zone in a manner to form a continuously flowing layer of the thermoplastic material across the surface of the body of high density heat exchange material. Thermoplastic material may be introduced into the contact vessel as a powder, melted in an intermediate section of the contact vessel, resolidified at the opposite end of the contact vessel and withdrawn as a sheet of thermoplastic material.

Abstract: A vinyl polymer polyol is prepared by the free radical initiated polymerization of vinyl monomers in a dispersing media comprising a polyether polyol and a salt formed by reacting a polyoxyalkylene polyamine with an acid containing a polymerizable double bond.

Abstract: Poly(allylamine salts) of high polymerization degree is obtained in high yield by the polymerization of monoallylamine salt with a specified radical-polymerization initiator having in the molecule an azo group. Various poly(allylamine) derivatives are obtained by reacting said poly(allylamine salt) with acrylic compounds, or formic acid and formaldehyde.

Abstract: Antimicrobial compositions finding particular utility for coating access systems, lead devices including shunts, cannulae, catheters, catheter adapters, wires and other solid or hollow tubular devices used for a variety of medical purposes is provided. The composition comprises a material selected from the group consisting of acrylonitrile-butadiene-styrene copolymers, polyvinyl chloride, mixtures thereof, polyesters, polyurethanes, styrene-block copolymers, natural and synthetic rubbers, polycarbonates, nylon and silicone rubber mixed with an oligodynamic material consisting essentially of compounds of physiological, antimicrobial metals.