Abstract: N-(2,2,6,6-tetraalkyl-4-piperidinyl)amide-hydrazides of dicarboxylic acids contain a light stabilizing group, a heat stabilizing group, and a reactive hydrazide functionality in the same molecule. The reactive stabilizers are prepared by reacting 4-amino-2,2,6,6-tetraalkylpiperidines with diesters (or mono ester acid chlorides) of dicarboxylic acids or dialkyl itaconates followed by hydrazinolysis of the ester group of the intermediate mono esteramide. The compounds are useful for introducing permanent heat and light stability to coreactive polymers or copolymers. They are also useful in the stabilization of inert polymeric systems against the degradative effects of heat and light when merely mixed with, rather than reacted with, the polymers for which stabilization is sought.

Abstract: Bleached chemithermomechanical wood pulp having a high degree of whiteness is economically prepared by mechanically disintegrating and chemically digesting lignocellulosic material with sulfite at a temperature of at least 100.degree.C. under saturated water vapor pressure and thereafter bleaching the pulp thus treated with hydrogen peroxide in an alkaline medium, and wherein no solids or liquids are removed from the pulp from the outset of treatment through completion of the bleaching step.

Abstract: Improvedly extrudable/coatable ethylene (co)polymers, well adopted for the production of film-coated metal composites, are prepared by radical polymerizing ethylene or recipe thereof including at least one ester of an unsaturated carboxylic acid, e.g., (meth)acrylic acid, advantageously under a pressure ranging from about 800 to 2,500 bars and at a temperature ranging from about 140.degree. to 280.degree. C., in the presence of an effective chain-transfer amount of at least one unconjugated diene, e.g., hexa-1,5-diene, deca-1,9-diene or 2-methylocta-1,7-diene.

Abstract: High-yield lignocellulosic wood pulps are bleached by (i) first pretreating such pulp with a complexing agent for metal ions and next washing the pretreated pulp, and then (ii) bleaching such pretreated/washed pulp with an initial amount of hydrogen peroxide in an alkaline medium, including adding a supplementary bleaching amount of hydrogen peroxide and a supplementary amount of an alkaline agent to the pulp over the course of the bleaching step (ii) without interrupting same, at a point in time when from 60% to 85% of the initial amount of hydrogen peroxide has been consumed, and such supplementary amount of hydrogen peroxide being equal to or less than the initial amount thereof.

Abstract: Macrocrystalline .alpha.-alumina hexagonal platelets, well adapted as reinforcing materials and polishing agents, are prepared by calcining admixture of transition or hydrated alumina and a fluorocompound flux, such fluorocompound flux having a melting point of up to 800.degree. C. and, in the molten state, serving to dissolve the transition/hydrated alumina.

Abstract: Improved monodisperse spheroidal particle latices of vinyl chloride polymers, e.g., having particle sizes ranging from 0.17 to 0.8 .mu.m or from 0.5 to 1.2 .mu.m, are produced by aqueous emulsion polymerization of vinyl chloride monomer, whether in a single stage or in two stages, in the absence of surface-active agent, in the presence of at least 0.2% by weight of at least one water-soluble alkali metal or ammonium persulfate initiator, and also in the presence of at least one water-soluble auxiliary compound that is a solvent for vinyl chloride, in such amount that the solubility of vinyl chloride in the aqueous phase at 25.degree. C. at atmospheric pressure is at least 1.5 g/l.

Abstract: Novel N-substituted maleimide homopolymers having a number-average molecular weight ranging from 12,000 to about 100,000 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one organometallic polymerization initiator which comprises sec-butyllithium, a sodium alcoholate, diphenylmethylpotassium, naphthalenelithium or naphthalenesodium, and novel N-substituted maleimide homopolymers having a polydispersity index ranging from 1.1 to 1.5 are prepared by anionically polymerizing an N-substituted maleimide monomer, in solvent phase, in the presence of at least one alkali metal organometallic polymerization initiator and at least one inorganic or organic salt of an alkali or alkaline earth metal; novel block copolymers include blocks of the above maleimido homopolymers and, e.g., blocks of an acrylic or methacrylic polymer.

Abstract: Crack-free, dense and either amorphous or crystalline, nonoxide monolithic ceramic shaped articles are produced at relatively low temperatures, by shaping a powder (P) of an infusible, organometallic ceramic precursor polymer (Pi) into a green body having a relative density of at least 65%, and thence pyrolyzing such shaped green body.

Abstract: The alkyl groups of dialkyl trisulfides are exchanged with the alkyl groups of mercaptans by reacting a tertiary dialkyl trisulfide with an alkyl mercaptan having a greater number of carbon atoms in its alkyl group than said trisulfide in the presence of an acidic or basic type catalyst for a time and a temperature sufficient to produce a dialkyl trisulfide having at least one transferred alkyl group from said mercaptan.

Abstract: Functional chromium and chromium-alloy deposits are obtained from an electroplating solution having substantially the composition: 22 g/l Cr.sup.+3 ; 250 g/l KCl; 63 g/l H.sub.3 BO.sub.3 ; 30 g/l HCO.sub.2.sup.= ; 15 g/lKBr; and 120 ppm of a wetting agent. The plating solution provides improved efficiency, stress values and appearance over the prior art, and is tolerant of metallic iron and ionic iron and ammonium.

Abstract: The mixture consists of at least one organic peroxide, at least one hydroquinone derivative of the general formulae I and/or II and/or III ##STR1## wherein R and R.sup.1, which may be identical or different, stand for H or t-alkyl, and X stands, for example, for C.sub.1-18 -alkylene, and a crosslinkage promoter, and permits the crosslinkage of polymers and at the same time extends the scorch time, which must be understood as the processing time.

Abstract: Polymers containing repeating units of: ##STR1## and optionally random distribution of other units derived from at least one vinyl monomer, R.sub.1 is H; alkyl, cycloalkyl or aryl each of which is unsubstituted or substituted by at least one halogen; ##STR2## (R.sub.7 is H, alkyl, cycloalkyl or aryl); A is a single bond; alkylene, cycloalkylene or arylene; or ##STR3## (B is alkylene, cycloalkylene or arylene); R.sub.2, R.sub.3 and R.sub.4 are alkyl, cycloalkyl or aryl; it being possible for at least one of R.sub.3 and R.sub.4 to contain at least one hydroxyl or carboxylic acid groups or to represent a polyoxyethylene or polyester sequence.These polymers are useful for the preparation of graft copolymers containing the units of the formula: ##STR4## where Po is a vinyl or a diene polymer sequence, and other vinyl units. These graft copolymers are useful especially as compatibility agents.

Abstract: Non-toxic polymeric compositions suitable for use in the handling and packaging of foods, beverages or pharmaceuticals, or for use in medical devices, are stabilized against thermal and oxidative degradation with a organosulfide antioxidant having no more than 5 parts per million of free mercaptan groups.

Abstract: An unsaturated (meth)acrylic compound of formula: ##STR1## (X.dbd.O, S, NH, NR.sup.3 (R.sup.3 =C.sub.1-12 -alkyl) or O--(CH.sub.2).sub.n (where n=1-16 approximately); R.sup.2 =C.sub.2-20 straight-chain or branched alkyl, monocyclic or polycyclic cycloalkyl or heterocycloalkyl, or alkylaryl hydrocarbon chain, comprising an olefinic double bond in the chain, or at the end of the chain in the case of alkyl or alkylaryl, or an exocyclic or endocyclic olefinic double bond in the case of monocyclic or polycyclic cycloalkyl or heterocycloalkyl; and R.sup.1 =H or C.sub.1-5 -alkyl), is reacted at 10.degree.-60.degree. C. with at least one oxidizing compound (hydrogen peroxide) in the presence of at least one catalyst (alkali metal molybdates and tungstates) and in the presence of at least one phase transfer agent and when R.sup.2 =polycyclic cycloalkyl or hetercycloalkyl, an organic peracid or hydrogen peroxide in the presence of at least one heteropolyacid.

Abstract: A process for producing a novel catalyst wherein an amorphous alumina gel is formed at least on the surface of an aluminum-containing material, the gel is heated to form crystalline .alpha.- or .beta.-alumina trihydrate and the trihydrate is sulfided, the product of said process, and the method of producing mercaptans from alcohols or ethers and hydrogen sulfide at elevated temperature in the presence of said novel catalyst, are disclosed herein.

Abstract: Impure white phosphorus values are purified to such extent as to be useful, e.g., for the preparation of P.sub.4 S.sub.10 therefrom, by (a) reacting liquid, impure white phosphorus with an aqueous suspension of a purifying amount of active charcoal to provide a mixture of purification, (b) separating such mixture of purification into a phosphorus-containing phase and an aqueous phase, (c) separating this phosphorus-containing phase, e.g., by means of a silica filter, into purified liquid white phosphorus and spent active charcoal, and (d) recovering the white phosphorus thus purified.

Abstract: The alpha-halogenated carboxylic acids/esters are dehalogenated by reaction with hydrogen in the presence of a catalytically effective amount of (i) a Group VIII precious metal catalyst and (ii) either sulfur or a sulfur compound, or (iii) a novel precious metal/sulfur solid phase catalyst; the subject dehalogenation is especially adapted for enriching the monochloroacetic acid content of MCAA/DCAA mixtures.

Abstract: Malodorous liquid animal manures are deodorized by treating the sample with an effective deodorizing amount of at least one polyoxyalkylene ester of undecylenic acid having from 2 to 10 oxyalkylene recurring units.

Abstract: A process for thermoforming a sheet of poly(methyl methacrylate) which has a reduced viscosity of at least 1.5, protected on at least one of its faces, by a film, in intimate contact with it. The film is an ethylene polymer which has undergone a corona discharge treatment. The ethylene polymer film is coated with a layer of acrylic adhesive after the ethylene polymer film has undergone the corona treatment.

Abstract: An electrochromic element useful in an electrochromic glass or mirror device and a process for making such element. The element is a five-layered structure including an electrolyte ion conducting layer interposed between first and second inorganic electrochromic layers which are interposed between a pair of conductive electrodes. The first and second inorganic electrochromic layers are different and are capable of exhibiting color-forming properties complementary to one another upon the incorporation of an alkali metal or Ag ion, a mixture of alkali metal or Ag ions or a mixture of alkali metal or Ag and hydrogen ions. The electrolyte ion conducting layer may be a copolymer of ethylene oxide, butylene oxide or methyl glycidyl ether, and optionally a small amount of allyl glycidyl ether, along with an ionizable salt, or may be a polyurethane gel formed by reacting the copolymer with triisocyanate, along with an ionizable salt.