Abstract: The present invention relates to crosslinked polyurethane-polyurea powders which are prepared by a process which comprises dispersing NCO semiprepolymers in an aqueous medium, forming powders and isolating the powders from the aqueous medium, the NCO semiprepolymers having an NCO content of 10 to 20%, being liquid at room temperature and/or dissolved in isocyanate-inert, water-soluble solvents and based on the reaction product of(a) a polyisocyanate component based on at least one organic polyisocyanate with a polyol component having an average hydroxyl functionality of 2.3 to 4.0 and containing(b) a hydrophobic polyol component containing less than 25% by weight of ethylene oxide units, --CH.sub.2 --CH.sub.

Abstract: Epoxy resins are modified by reaction with a pyridine compound and a Bronsted acid. These modified epoxy resins when cured result in products having improved properties.

Abstract: Lignin, or a lignin derived material, which has been significantly demethylated (e.g., the demethylated lignin found in the raffinate produced as a by-product of dimethyl sulfide production which can be carried out using the spent liquor from wood pulping operations) can be isolated by a process wherein an organic solvent is added to a lignin-containing aqueous solution. The organic solvent is typically a polar, and at least a partially water-immiscible substance such as, for example, ethyl acetate. The resulting lignin-containing aqueous solution/organic solvent mixture is acidified to produce a water layer which is discarded and an organic solvent layer which contains the demethylated lignin. Upon its recovery, the demethylated lignin is preferably dried and stored until it is used (along with an alkali, an aldehyde and an adhesive filler) in compounding an adhesive of the type generally used in the manufacture of plywood.

Abstract: A series of oligomeric adducts of diols and diepoxides are disclosed which are precursors of amine resins for use in electrodeposition coatings. The adducts are epoxide-alcohol addition products of a polyaromatic and/or a mono-aromatic diol and a polyaromatic bis-glycidyl ether, and/or a monoaromatic bis-glycidyl ether and/or an alkoxy arylene bis-glycidyl ether, thioether or amine. The coatings which include amine resin, cross linking agent, grind resin and pigment exhibit excellent corrosion resistance.

Abstract: A crystalline copolymer of p-dioxanone and a poly(alkylene oxide), and absorbable surgical filaments and devices derived therefrom.

Abstract: A process for condensing at least one aliphatic epoxide having at least 8 atoms of carbon in its molecule on at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst consisting of at least one titanium complex of general formula (I) Ti(OR).sub.2 (L).sub.2 in which each R group independently represents one hydrocarbon group with 1 to 10 atoms of carbon and each L group represents a ligand of the diketonic beta type or of the keto-ester beta.

Abstract: Advanced epoxy resins are disclosed which can be obtained by reacting liquid or semi-solid aromatic opoxy resins with aliphatic diols, and subsequently reacting the reaction product with mono- or binuclear bisphenols in the presence of a cyclic quaternary ammonium salt.

Abstract: An epoxy resin composition is disclosed that can be cured at a temperature of 150.degree. C. or below, and can be used to provide a high performance carbon fiber composite material having a 0.degree. direction bending strength of 220 kg/mm.sup.2 or over, and an interlayer shear strength of 10 kg/mm.sup.2 or over.The composition is made up of:(A) an epoxy compound containing 10 to 100% by weight of m- or o-methyl-p-N,N-diglycidyl-aminophenyl-ether or its oligomer,(B) diaminodiphenylsulfone and/or diaminodiphenylmethane,(C) dicyandiamide, 2,6-xylenylbiguanide, o-tolylbiguanide, diphenylguanidine, adipil dihydrazide, azelayl dihydrazide, or isophthalic acid dihydrazide, and(D) a urea compound.

Abstract: A polymer of an epoxy compound is selectively obtained by polymerizing an epoxy compound having the formula (I): ##STR1## wherein R is a substituted or unsubstituted alkyl group, by using an initiator comprising a silyl ether represented by the general formul (II): ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are each a substituted or unsubstituted alkyl or aryl group, in the presence of an inorganic fluoride catalyst, thereby preparing a polyether having a silyloxy group in its terminal.

Abstract: A synthetic resin which carries basic nitrogen groups and is water-dilutable by protonation with acid is obtainable by reacting(A) an epoxy resin having an average molecular weight M.sub.n of from 300 to 6,000 and on average from 1.5 to 3.0 epoxy groups per molecule with(B) a ketimine of a primary amine additionally containing one or more urethane groups and optionally also with(C) a diketimine of a diprimary amine containing no urethane groups and optionally also with(D) a secondary amine which may contain a tertiary amino group also, a ketimine of a primary monoamine and/or a ketimine of a primary/tertiary diamine.

Abstract: A synthetic resin which carries basic nitrogen groups and is water-dilutable by protonation with acid is obtainable by reacting(A) an epoxy resin having an average molecular weight M.sub.n of from 300 to 6,000 and on average from 1.5 to 3.0 epoxy groups per molecule with(B) a ketimine of a primary amine additionally containing one or more urethane groups and optionally also with(C) a diketimine of a diprimary amine containing no urethane groups and optionally also with(D) a secondary amine which may contain a tertiary amino group also, a ketimine of a primary monoamine and/or a ketimine of a primary/tertiary diamine.

Abstract: A process is disclosed for preparing a composition comprising a polybutyl ketone and a hydroxyester of an epoxidized polybutene wherein the epoxide groups of said epoxidized polybutene are at least 70% trisubstituted. Acid compounds are reacted with epoxidized polybutenes to obtain compositions of increased reactivity as compared with polybutyl ketone compounds. These compositions are useful as chemical intermediates to modify such materials as polyesters and polyurethenes, for applications such as coatings, foams, and sealants.

Abstract: A heat curable composition is provided which is useful for encapsulating microelectronic devices using a heat curable epoxy composition having a diaryliodonium hexafluoroantimonate salt as a catalyst in combination with an effective amount of a free radical generating aromatic compound as a cocatalyst.

Abstract: A method of producing a sulfated lignin comprising the steps of dissolving lignin in an aqueous alkaline solution, adding an organic amine-sulfur trioxide complex to the dissolved lignin, and reacting the amine-sulfur trioxide complex with the lignin under conditions to sulfate the same.

Abstract: Sulfonium salts of the formulae I to IV ##STR1## in which A is C.sub.1 -C.sub.12 alkyl, C.sub.3 -C.sub.8 cycloalkyl, C.sub.4 -C.sub.10 cycloalkylalkyl, phenyl which is unsubstituted or mono- or polysubstituted by C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, nitro, phenyl, phenoxy, alkoxycarbonyl having 1-4 C atoms in the alkoxy radical or acyl having 1-12 C atoms, Ar, Ar.sup.1 and Ar.sup.2, independently of one another, are each unsubstituted or mono- or polysubstituted phenyl, or naphthyl which is unsubstituted or mono- or polysubstituted each arylene is an unsubstituted or mono- or polysubstituted phenylene or unsubstituted or mono- or polysubstituted naphthylene and Q.sup..crclbar. is SbF.sub.6 --, AsF.sub.6 -- or SbF.sub.5 OH-- are valuable curing agents and curing accelerators in the heat-curing of cationically polymerizable compounds, preferably epoxy resins.

Abstract: Epoxy-containing compounds are prepared by dehydrohalogenating the reaction product of an epihalohydrin with the reaction product of a compound containing an average of more than one aromatic hydroxyl group per molecule with an alkylene oxide wherein the ratio of moles of epihalohydrin to hydroxyl groups is at least about 1.2:1. When these epoxy containing compounds are formulated into coatings, the resultant products have improved chemical resistance to acids.

Abstract: The present invention relates to hydrophilic, swellable graft copolymers composed, in random distribution, of 0.5 to 20% by weight of radicals of the general formula I ##STR1## 79 to 99% by weight of radicals containing an acidic group, of the general formula II ##STR2## and 0.1 to 2% by weight of crosslinking structures which are derived from monomers having at least two olefinically unsaturated double bonds, where the radicals X, Y, R.sup.1 to R.sup.4 and n have the meanings given in claim 1, and which are used as absorbents for water and aqueous solutions.

Abstract: Chemorheologically viscosity tailored matrix resin formulation for use in forming prepregs and filament wound composite articles and having a specified viscosity profile comprising a curable matrix resin and an effective amount of a reactive resin curing agent reactive at room temperature and a latent resin curing agent substantially non-reactive at room temperature but activated upon heating or radiation such that the matrix resin formulation is adapted upon formulation to have a viscosity sufficiently low enough to enable the matrix resin to impregnate a filament or fiber at room temperature without the necessity for the application of heat or solvent and which, upon standing at room temperature after impregnation into the fiber or filament to form a prepreg composition, rises in viscosity to a viscosity level sufficiently high to prevent substantially any bleed of the matrix resin from winding tension upon spooling of the prepreg yet of sufficiently low enough viscosity to allow the prepreg to tack and dra

Abstract: A filler of non-metallic, light transparent material is formed into particles or flakes and coated with opaque material and dispersed in closed cell foam to reduce overall thermal conductivity and, specifically, to reduce radiation heat transfer.

Abstract: A polylactic acid fiber comprises a blend of poly-L-lactic acid and poly-D-lactic acid and is improved by spinning and then drawing.