Abstract: An opoxy resin is obtained by reacting an epihalohydrin with an imido-ring-containing diphenol represented by the following formula (I): ##STR1## wherein R represents an aliphatic group having at least two carbon atoms, an alicyclic group, a monocyclic aryl group, a fused polycyclic aromatic group, or a non-fused polycyclic aromatic group formed of aromatic groups coupled together directly or via a linking member and the two hydroxyl groups are each bonded to a meta position or the para position. In the epoxy resin, at least 50% of the hdroxyl groups of molecules of the diphenol have been opoxidized.

Abstract: Liquid acid anhydrides are excellent curatives for epoxy resins but state of the art processing methods require cures at temperatures in excess of 100.degree. C. to obtain well cured polymers. It has been found that a resinous liquid polyol prepared from a polyol and an epoxy resin in the presence of a quaternary ammonium compound acts as an excellent promoter for the epoxy resin anhydride reaction producing well cured polymers at temperatures of about 70.degree. C. The use of a metallo-organic compound in addition to the resinous polyol provides for rapid gelation and development of cure at 70.degree. C.

Abstract: Novel 1-arylcyclobutenecarboxylate esters of glycidyloxy compounds having at least two glycidyloxy substituents are self-curing thermoset resins. The cured products derived by applying heat to the esters are crosslinked insoluble solids having good properties.

Abstract: Disclosed is a heat-resistant flame-retardant epoxy resin composition comprising a halogen-containing epoxy resin obtained by reacting a trifunctional epoxy compound having a specific structure with a halogenated bisphenol in the presence of a catalyst. Furthermore, a novel specific trifunctional epoxy compound is disclosed, which is valuably used for the production of the above-mentioned halogen-containing epoxy resin.

Abstract: Thermosetting resin compositions comprise a mixture of a 1-arylcyclobutenecarboxylate ester of a glycidyloxy compound having at least two glycidyloxy substituents and at least one polymerizable monomer having at least two substituents with multiple valence bonds between adjacent atoms. Also claimed are the cured products obtained by heating such compositions.

Abstract: A ferroelectric liquid-crystalline polymer consisting essentially of at least one repeating unit represented by the following general formula: ##STR1## wherein k is an integer having a value of 2 to 30;R.sup.1 is ##STR2## X is --COO-- or --OCO--; and R.sup.2 is --COOR.sup.3, --OCOR.sup.3 or --OR.sup.3 ;wherein R.sup.3 is ##STR3## wherein each of R.sup.4 and R.sup.5 is independently --CH.sub.3, a halogen atom or --CN;each of m and n is independently an integer having a value of 0 to 10, with the proviso that when R.sup.4 is --CH.sub.3, n is not an integer having a value of 0;p is an integer having a value of 0 or 1; andC marked with * is an asymmetric carbon atom.

Abstract: A liquid, epoxy resin composition suitable for use in fixation of a stator coil or a rotor coil is disclosed, which comprises (A) a mixture containing (a.sub.1) a Bisphenol A epoxy resin and (a.sub.2) an alicyclic epoxy resin; and (B) a curing agent including (b.sub.1) an acid anhydride, and (b.sub.2) a phenol compound of the general formula: ##STR1## wherein R.sup.1 and R.sup.2 represent independently from each other a lower alkyl, R.sup.3 represents a lower alkylene and n is an integer of 1-5, the amount of the phenol compound (b.sub.2) being in the range of 2-8% based on the weight of the mixture (A).

Abstract: The invention relates to benzyloxy vinyl ethers having the structure ##STR1## wherein R.sub.1 is lower alkyl;p is an integer having a value of from 0 to 2;q is an integer having a value of from 1 to 20;r is an integer having a value of from 1 to 6;n is an integer having a value of from 0 to 20;m is an integer having a value of from 0 to 1;Y is sulfur or oxygen;X is hydrogen or methyl andR and R.sub.2 are each independently a radical having from 2 to 20 carbon atoms and are selected from the group of alkylene, arylene, aralkenylene and alkarylene optionally substituted with lower alkyl.The invention also relates to the process for preparing the above multifunctional benzyloxy vinyl ethers.

Abstract: A process for the purification of the polyetherdiols obtained by copolymerization of tetrahydrofuran and 1-alkene oxides by catalytic hydrogenation at temperatures up to 250.degree. C.

Abstract: Epoxy resins can be cured by the use of a curing agent formed by the reaction of phosphorus pentoxide with a trialkyl phosphate or phosphonate.

Abstract: Storage-stable, thermally-curable, one-part epoxy resin compositions comprising a curable epoxide resin; a curative amount of an aliphatic or non-aromatic cyclic polyol having about 2 to 18 carbon atoms, at least two hydroxy groups of said polyol being primary or secondary, and said polyol being free of strong acid groups, and free of electron-withdrawing substituents and large groups which cause steric hindrance in the .alpha.-position in relation to the carbon atoms attached to the methylol groups of the polyol; and a catalytic amount of an imidazole compound.

Abstract: High purity polyether polyol compositions such as polyethylene glycol are made having small amounts of impurities such as oligomers of active hydrogen compounds with alkylene oxides. The high purity is achieved by subjecting the polyether polyol compositions to membrane filtration to get less than about 10 parts per million of the low molecular weight oligomers.

Abstract: A process for the production of lignin in which lignin is precipitated from aqueous solution by acidification and agitation and the precipitated lignin is separated from accompanying liquid in which the lignin-containing solution and the acid are introduced by simultaneous cocurrent flow into an agitated mixing region, the precipitated lignin is separated not more than 60 minutes after precipitation and the separated lignin is subsequently washed. The process can form a step in a general process for the treatment of lignocellulosic materials to produce one or more products including lignin. The process enables the ash content of lignin to be reduced.

Abstract: This invention relates to bridged cyclohexylamines represented by the formula: ##STR1## A is C.sub.0, --CH.sub.2 --, ##STR2## R.sub.1 is C.sub.1-3 alkyl R.sub.2 is C.sub.1-6 alkylR.sub.3 is C.sub.1 or C.sub.2 alkylR.sub.4 is H or C.sub.1-4 alkylx is 0 or 1y is 0 or 1These bridged bis(cyclohexylamine) derivatives are well suited as curing agents for epoxy resins. These compositions lead to enhanced processing of the epoxy resin and permit adjustment of the reactivity/performance in formulating epoxies which demonstrate superior high temperature properties.

Abstract: Curable compositions comprising a curing agent and the product resulting from reacting (I) the product resulting from the free radical polymerization of (A) the composition resulting from (1) reacting (a) a compound containing an average of more than one vicinal epoxide group per molecule with (b) at least one unsaturated imide having a reactive hydrogen atom attached to the imide nitrogen atom in amounts which provide a ratio of moles of component (b) per epoxide group contained in component (a) of from about 0.01:1 to about 1.1:1; and (2) optionally, reacting the product of step (A) with (c) at least one of (i) at least one compound containing only one phenolic hydroxyl group, (ii) at least one secondary amine, or (iii) a combination of (i) and (ii) in amounts sufficient that the resulting product contains a percent epoxide value of not greater than about 1.

Abstract: A processable, high temperature polymer derived from 1,4,5,8-tetrahydro-1,4;5,8-diepoxyanthracene and a bis-diene, particularly an anthracene end-capped polyimide oligomer and a method for the preparation thereof. Also provided is a fabricated, electrically conducting, void-free composite comprising said polymer.

Abstract: Secondary isopropylamine terminated polyoxyethylene and/or polyoxypropylene diamines or triamines are formed in a one-step reaction when a polyoxyethylene and/or polyoxypropylene primary diamine or triamine is hydrogenated with hydrogen in the presence of a hydrogenation catalyst, hydrogen and acetone. The secondary isopropylamine terminated polyoxyethylene and/or polyoxypropylene primary diamines or triamines are useful as curing agents for epoxy resins.

Abstract: Methods of solution processing of rigid chain and ladder polymers to films, coatings, or fibers from isotropic or anisotropic solutions in aprotic organic solvents containing Lewis acids are disclosed.

Abstract: Poly(alkylene carbonates) of controlled molecular weight are made by copolymerizing carbon dioxide and one or more oxirane compounds using zinc polycarboxylate catalyst in the presence of a sterically hindered organic proton donor. The acidity of the donor is in the range of 3 to 20 pK.sub.a and the steric quality of the donor is such that it has a steric parameter (E.sub.s) of -0.38 or less. The molecular weight of the polymer can be regulated by altering the level of proton donor over a range which does not adversely affect catalyst productivity. Benzoic acid and phenol are examples of suitable proton donors. The preferred catalyst is one made from zinc oxide and a dicarboxylic acid, such as glutaric acid or adipic acid.

Abstract: A non-shrinking, strain-free, dimensionally-stable modified epoxy resin is disclosed for use in the fabrication of composite, structural laminates. The uniqueness of product preparation is that the optimum amount of the lactone compound can be copolymerized with the epoxy resin since equimolar amounts of each monomer do not necessarily need to be copolymerized to achieve the optimum shrink resistance. By varying the ratio of shrink-resistant monomer and epoxy in a resin blend, a means is available for controlling the shrinkage, and, in this manner, it would be possible to produce a laminate with a matrix so tailored so that reinforcing fibers would not undergo breakage, or pull out of the matrix on being stressed. The modified epoxy resin is the reaction product produced from reacting a compound selected from 6-hexanolactone and 5-norbornene-2,2-dimethanol with the diglycidyl ether of bisphenol A and cured with the curing agent hexahydrophthalic acid.