Abstract: Undesirable deposition of polyoxymethylene onto the inner wall of a polymerization vessel and onto a stirrer, which deposition is observed in the slurry polymerization of formaldehyde carried out in an inert organic liquid medium in the presence of a polymerization catalyst, can be minimized by carrying out the slurry polymerization in the presence of at least one polyvalent metal salt selected from polyvalent metal salts of alkylsalicylic acids and polyvalent metal salts of dialkyl esters of sulfosuccinic acid. Optionally, a polyethylene glycol monoether may be used in addition to the polyvalent metal salt.

Abstract: Catalysts for foundry core binders prepared by reacting polyphosphoric acid with an alcohol.

Abstract: Binders for foundry core sands and the like comprising furfuryl alcohol and an aromatic dialdehyde and optionally an aromatic alcohol.

Abstract: A novel, water-soluble acetal polymer is prepared by reacting a hydroxyl-containing aldehyde with a glycol in an acid reaction medium. The acetal polymer is useful as a dispersing agent for other polymers and as a reactant for the preparation of polyurethane resins.

Abstract: Substances (I) capable of being converted into higher-molecular weight materials under the influence of a cationic catalyst, such as 1,2-epoxides, aminoplasts, vinyl monomers or prepolymers, or phenoplasts, are so converted by exposure to actinic irradiation or by heating in the presence of an aryloxysulfoxonium salt of formula ##STR1## where either R.sup.6 and R.sup.7 separately denote lower alkyl (optionally substituted by halogen and interrupted in the chain by --O-- or --SO.sub.2 --), or an aryl or aryloxy group, or R.sup.6 and R.sup.7 together denote a divalent group forming with the S atom a heterocyclic radical; R.sup.8 denotes an aryl group; M denotes an atom of a metal or metalloid; X denotes a halogen atom; and n is 4, 5, or 6, for instance,p-chlorophenoxy-p-tolyl-p-phenoxysulfoxonium hexafluorophosphate and 1-phenoxy-1-oxidotetrahydrothiophenium tetrafluorborate.

Abstract: Aminoplast resin pigments for paper making comprise large surface area (>5m.sup.2 /g) particles, preferably of size below 200 .mu.m, made from an aminoplast resin made by condensing formaldehyde with urea and/or melamine in the presence of 0.2 to 15 moles, per 100 moles of formaldehyde, or sulphite, phosphate, phosphite or borate radicals. The resin may be converted to the particulate form by gelling the resin in extended form by dilution with an aqueous acid, followed by drying, curing, and comminution of the gelled resin. To effect gelation in extended form the resin is preferably diluted to a resin solids content of less than 25% by weight by the addition of sufficient acid to cause gelation within 20 minutes.

Abstract: The invention pertains to thermosetting powder paint compositions adapted to fuse and thermoset upon exposure to heat. The powder paint is based upon a one-component, self-curing polymeric binder comprising a thermosetting glycoluril copolymer containing methylol or alkoxy methyl glycoluril groups adapted to cross-link with reactive hydroxyl, carboxyl, or amide groups on the copolymer. The copolymer is produced by partial condensation of tetramethylol or tetra-alkoxy methyl glycoluril with units containing reactive hydroxyls, carboxyls, or amide groups.

Abstract: The invention relates to a liquid coating composition based on an aminoplast and an ester thiol built up from a polyol and a mercaptocarboxylic acid having 2 to 7 carbon atoms. The invention also relates to a process for coating a substrate with such a composition, and to the substrate thus manufactured.

Abstract: Polyoxymethylene having high molecular weight and high thermal stability is produced by polymerizing formaldehyde in the presence of a specific catalyst and then heating the resulting polyoxymethylene. The specific catalyst is produced by contacting a phosphorus containing compound or an amine (c) with a reaction product obtained by reacting salicylic acid component (b) with an organoaluminum compound (a) having the formula ##STR1## wherein R.sup.1 represents an alkyl or alkoxyl group and R.sup.2 and R.sup.3 respectively represent alkyl or alkoxyl group or a halogen atom.

Abstract: A process for the preparation of soft and hard resins, and their use in surface-coating binders are disclosed. According to the invention, soft and hard resins are prepared from a urea, formaldehyde and a CH-acidic aldehyde by reacting a urea of the general formula (I) or (II) ##STR1## where R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl, A is alkylene and X is oxygen or sulfur, with formaldehyde and a CH-acidic aldehyde of the general formula (III) ##STR2## where R.sup.3 and R.sup.4 are identical or different alkyl, aryl or alkylaryl wherein the urea, formaldehyde and CH-acidic aldehyde are employed in a mole ratio of from 1:2:2 to 1:4:4, at from 60.degree. to 150.degree. C., in the presence of an acid and in the presence or absence of a solvent and/or diluent, and then treating the product with a base in an anhydrousmedium.

Abstract: Poly(aldehyde amino silicate) foams are produced by mixing an amino compound, an aldehyde, a silicon oxide compound and a blowing agent; then a curing agent is added, thereby producing a rigid, porous product.

Abstract: A method for increasing the 4,4' disubstituted isomer of the diphenylmethane dicarbamates produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, which comprises carrying out the condensation in a single phase system with a dilute solution of the N-aryl carbamic acid ester in an inert solvent having a dielectric constant of at least 20 at 20.degree. C. The solvent must have good solubility for the carbamates, which carbamates are employed in the solvent at concentrations of from about 0.1 to 50 weight percent to provide a product enriched with the 4,4'-diphenylmethane dicarbamate isomer.

Abstract: A process for polymerizing trioxane made from an aqueous solution of methanol-containing formaldehyde by a conventional method or copolymerizing the trioxane with another monomer, characterized bycooling the trioxane to crystallize it,allowing the trioxane in a crystalline state to stand in an open system in an atmosphere of air or an inert gas to remove polyoxymethylene dimethoxide from the trioxane,melting the trioxane, andpolymerizing the trioxane or copolymerizing the trioxane and the another monomer.

Abstract: Poly(aldehyde amino silicate) foams are produced by mixing an amino compound, an aldehyde, a silicon oxide compound and a blowing agent; then a curing agent is added, thereby producing a rigid, porous product.

Abstract: Process and catalyst for curing resins (e.g. furans) comprising concentrated aqueous solutions of perchloric acid (about 45-72%) and the cured resins obtained using said catalyst. Improved catalyst combinations for curing resins in a process employing same and the cured resin produced thereby comprising concentrated perchloric acid, a small amount of phosphoric acid and/or a small amount of boric acid.

Abstract: Aromatic onium salts, such as diaryliodonium salts, have been found to be effective thermal initiators for the polymerization of a variety of cationically polymerizable materials including epoxides, cyclic ethers, phenol formaldehyde resins, etc., when used in combination with various cocatalysts such as organic acids and copper salts.

Abstract: The present invention relates to a method for the manufacture of an improved ureaform fertilizer. The method consists in the condensation of urea and formaldehyde carried out in a controlled system having a pH between 3.5 and 4.2 wherein the overall concentration of the reagents is in the range of 20 to 40% by weight. The ratio between the reagents is between 1.2 to 1.5 moles of urea to 1 mole of formaldehyde and the temperature of the reaction is kept between 15.degree. C. to 40.degree. C. Examples of preferred controlled systems are H.sub.3 PO.sub.4 -KH.sub.2 PO.sub.4 and H.sub.3 PO.sub.4 -NH.sub.4 H.sub.2 PO.sub.4. The method can also be performed in a continuous manner giving rise to an overall quantitative yield, and being temperature self-regulating.The ureaform obtained by the method has an activity index of over 75 and excellent physical properties.

Abstract: Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the condensation of N-aryl carbamic acid esters, such as ethylphenylcarbamate, with formaldehyde, para-formaldehyde or trioxane in the presence of an organic sulfonic or halogenated organic sulfonic acid which has an acid concentration of at least 75 percent, at temperatures of from ambient to about 170.degree. C. and optionally in the presence of an inert solvent.

Abstract: Polyoxymethylene is produced by polymerizing formaldehyde in the presence of a catalyst comprising a catalytic component of an organoaluminum compound or a complex thereof supported on a modifier of a higher carboxylic acid amide compound.The organoaluminum compound can be in a form of a complex of the organoaluminum compound and a phosphorus compound or an amine.

Abstract: Ester end-capped copolyether glycol is prepared by copolymerizing tetrahydrofuran and an alkylene oxide or cyclic acetal in a reaction mixture which contains, in addition to the tetrahydrofuran and alkylene oxide or cyclic acetal,(1) a polymeric catalyst which contains .alpha.-fluoro sulfonic acid groups,And(2) an acylium ion precursor such as acetic anhydride.

Abstract: A method for the preparation of soluble, fusible, aminomethyl diaryl compound resins in the absence of halomethylation or halomethylated materials, which method comprises (a) refluxing a mixture of diaryl compound, an aldehyde, a saturated monocarboxylic acid, and a small amount of a strong acid catalyst to form an aldehyde-diaryl resin, (b) stripping off excess monocarboxylic acid under vacuum, and then (c) adding at least about 1 mole of a primary or secondary amine containing at least one additional nontertiary amino group per reactive group on the aldehyde-diaryl resin.

Abstract: To manufacture highly disperse solids of crosslinked urea-formaldehyde polycondensation products consisting of primary particles with an average diameter not greater than 1 micron, an aqueous solution consisting essentially of water and a precondensate of urea and formaldehyde is converted into a crosslinked gel by the addition of sulphamic acid or a water-soluble ammonium hydrogen sulphate, in the course of which the molar ratio of formaldehyde:urea should be greater than 1.2 and not greater than 2.0 not later than at the time of the formation of the gel. The resulting gel is comminuted, dried and disintegrated. The powders are suitable for use as pigments, carriers and absorbents.