Abstract: A process for producing a polyacetal copolymer, which comprises copolymerizing formaldehyde and a compound selected from the group consisting of alkylene oxides, poly(alkylene oxides), cyclic formals and poly (cyclic formals) in the presence of a Lewis acid and an anionic polymerization catalyst with the exception of metal chelate compounds.

Abstract: The present invention provides a process for the preparation of low molecular weight polyesters directly from hydroxypivaldehyde. The process comprises reacting dry hydroxypivaldehyde with a diester, a multifunctional ester, a diacid, a polyester, or a mixture thereof at a temperature of about 100.degree. C. to 230.degree. C. in the presence of a transesterification catalyst. Optionally, modifying glycols, triols, or polyols may also be added. Suitable catalysts include tetraisopropyl titanate, dibutyltin oxide, lithium hydroxide, and lithium alkoxide, with tetraisopropyl titanate being especially preferred. The reaction is preferably accomplished in two stages by heating the reaction mixture to about 130.degree. C. for about three hours and subsequently heating the reaction mixture to about 190.degree.-230.degree. C. until the reaction is essentially complete.

Abstract: A continuous polymerization method to obtain polymer production in the form of fine particles from a liquid polymerization medium; the reaction being conducted in a polymerization reactor wherein mixing is effected by the action of a plurality of elliptical paddles mounted on each of dual rotating shafts, characterised in that the dual shafts are rotated in reverse directions to each other, and the paddles being enclosed by walls of the reactor with the inside surface of the walls closely defining the surface generated by the rotation of the ends of both sets of paddles; and with the ends of major axes of the elliptical paddles on one rotating shaft periodically approaching the ends of minor axes of the corresponding elliptical paddles on the other rotating shaft to effect a mixing action as well as a longitudinal shearing action across a notional interface between the two shafts. The method is particularly useful for the polymerization of trioxane.

Abstract: Polymer compositions comprising adducts of acrolein and isocyanuric acid and polyfunctional compounds containing aldehyde-reactive groups such as amines, amides, alcohols, thiols and oxiranes. The compositions are useful in molding, laminating, coating and adhesive applications.

Abstract: Polymer compositions comprising acetals of acrolein-isocyanuric acid adducts and polyfunctional compounds containing acetal-reactive groups such as alcohols, thiols oxiranes and amides. The compositions are useful in molding, laminating, coating and adhesive applications.

Abstract: Polymer compositions comprising hemiacetals of acrolein-isocyanuric acid adducts and polyfunctional compounds containing hemiacetal-reactive groups such as amines, amides, alcohols, thiols and oxiranes. The compositions are useful in molding, laminating, coating and adhesive applications.

Abstract: In a process for producing a stabilized oxymethylene copolymer by heat-melting, at a temperature ranging between the melting point of the copolymer and a temperature 100.degree. C.

Abstract: Polymers useful in compositions and methods for preventing the attachment of dental plaque to the surface of the teeth of mammals comprise alkali metal salts of certain carboxylated naphthalene formaldehyde polymers in a pharmaceutically acceptable vehicle and the periodic application thereof to teeth.

Abstract: Compositions and methods for preventing the attachment of dental plaque to the surfaces of the teeth of mammals comprise certain sulfonated aromatic formaldehyde condensation polymers and the pharmaceutically acceptable salts thereof in a pharmaceutically acceptable vehicle, and the periodic application thereof to teeth.

Abstract: A method is provided by which thermally stable polyoxymethylene containing polymers are produced. These polymers are prepared by polymerizing trioxane or formaldehyde which has been first treated with micro-wave radiation. Trioxane or formaldehyde treated in this manner is then suitable for homopolymerization or copolymerization with any of the variety of comonomers known to copolymerize with these materials. The resultant polyoxymethylene containing polymers are of exceptional thermal stability without the necessity of added stabilizers.

Abstract: Undesirable deposition of polyoxymethylene onto the inner wall of a polymerization reactor and onto a stirrer, which deposition is observed in the slurry polymerization of formaldehyde carried out in an inert organic liquid medium, can be minimized by carrying out the slurry polymerization in the presence of a polymerization catalyst prepared by bringing a metal chelate compound into contact with polyoxymethylene in an inert organic liquid medium in the presence of formaldehyde. Preferably, the slurry polymerization is carried out in the presence of, in addition to the above-mentioned polymerization catalyst, at least one polyvalent metal salt of an alkylsalicylic acid or of a dialkyl ester of sulfosuccinic acid. It is also preferable to use a tubular closed loop reactor equipped with an impeller wherein gaseous formaldehyde is blown into the reactor in a position located downstream from the impeller, while the catalyst-containing slurry is circulated therethrough.

Abstract: A process for producing a polyacetal homopolymer or copolymer which comprises continuously feeding a liquid starting mixture containing molten trioxane and a catalyst and optionally a comonomer through a feed opening of a reactor, said reactor being a continuously stirring-type mixer having two stirring shafts having a plurality of plate-like paddles fixed thereto the cross-section of each of said paddles taken perpendicularly of the axial direction of the stirring shaft having a shape of a convex lens, an ellipse or a quasipolygon inscribing a phantom circle at each vertex, one of said paddles facing another paddle fixed to the other stirring shaft and said one paddle being positioned such that it rotates while the edges thereof keep a slight clearance from the inner surface of the barrel and the other paddle; polymerizing the starting mixture while moving it toward the discharge opening by the rotation of the paddles, the improvement wherein the profiles of the paddles are changed, or the arrangement of the

Abstract: Oligomeric formal diols are prepared by coupling segments of PTMEG, each having a molecular weight of 1000-3000, with formaldehyde. The formal diols are useful in preparing polyurethanes.

Abstract: The residual formaldehyde existing in the aqueous dispersion of microcapsules each having a capsule wall of an aldehyde polycondensation resin formed by polycondensation of formaldehyde with an amine in the presence of an acid catalyst is removed by adjusting the aqueous dispersion to an alkaline state, adding to the aqueous dispersion at least one reaction catalyst which is a member selected from the group consisting of metal hydroxides, phosphates, calcium salts and magnesium salts, and then heating and agitating the aqueous dispersion to cause a reaction to remove residual formaldehyde therefrom.

Abstract: A polyacetal carboxylate is provided having the following empirical formula: ##STR1## where M is selected from the group consisting of akali metal, ammonium, tetra-alkyl ammonium groups and alkanol ammonium groups, and n averages at least 4. Such polyacetal carboxylates can be used as complexing agents and detergency builders.

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: Poly(aldehyde aminosilicon acid) resinous products are produced by reacting an aminosilicon acid compound with an aldehyde compound.

Abstract: In a process for producing a stabilized oxymethylene copolymer which comprises heat-melting an oxymethylene copolymer having unstable, unblocked terminals obtained by the copolymerization of trioxane with a cyclic acetal and/or a cyclic ether to heat decompose it in the presence of available heat stabilizers; the improvement which comprises heating said oxymethylene copolymer having unblocked terminals in a mixer at a temperature between the melting point of said oxymethylene copolymer and a point 100.degree. C. higher than said melting point under a pressure of 0.

Abstract: An unsaturated condensate of a methylolmelamine, an acrylamide, an unsaturated fatty acid amide and optionally a C.sub.1 to C.sub.10 alcohol, wherein the methylolmelamine has at least about 5 methylol groups per melamine ring, wherein substantially all the methylol groups are condensed with acrylamide, unsaturated fatty acid amide or alcohol, wherein the number of acrylamide moieties of the condensate is in the range of about 1 to about 4 per melamine ring and the number of unsaturated fatty acid amide moieties is in the range of about 0.5 to about 2 per melamine ring and wherein the ratio of acrylamide moieties to unsaturated fatty acid amide moieties is in the range of about 1:1 to about 3:1. The unsaturated condensates are used in high solids unsaturated coating systems containing unsaturated oil-modified resins.

Abstract: There is described a polyurethane anionomer which is particularly suitable as a textile sizing agent because it is water-soluble and sufficiently hydrolysis-resistant to be recoverable by ultra-filtration. It is superior to previously known ionomers in being hard, tough and having a smooth surface.This anionomer is produced by reacting organic diisocyanates with tri- or tetra-ethylene glycol and optionally other aliphatic glycols as well as glycols bearing carboxyl, carboxylate, sulphonic acid or sulphonate groups in selected ratios which render the anionomer water-soluble after neutralization of an appropriate amount of the carboxyl or sulphonic acid groups. Aqueous solutions can be formed by dissolving the solid anionomer in water and these solutions can be used to size textile fibers with the recovery of excess anionomer by ulra-filtration.

Abstract: A polyacetal composition having excellent antistatic characteristics, good surface luster and moldability is disclosed. The composition embodying these properties includes a polyacetal resin and incorporated therein, a polyhydric alcohol fatty acid ester including a hydroxyl group and a polyethylene glycol.

Abstract: The terminal hydroxyl groups of an acetal polymer are esterified or etherified by reaction with an end-capping agent chosen from anhydrides of carboxylic acids, orthoesters and orthocarbonates, by forming an intimate mixture of polymer in powder form and liquid end-capping agent, the amount of said agent in the mixture being less than that which results in loss of the free-flowing characteristics of the powder, and reacting said mixture under stirring at 50.degree.-170.degree. C.

Abstract: Conventional aldehyde containing resins for making bonded products or insulation foam are deodorized by the addition thereto of a sulfur compound such as oxyacid salts of sulfur in a valence state ranging from +5 to -2 inclusive.

Abstract: An improved polymerization emulsifier for use in the manufacture of synthetic rubber is prepared wherein a mixture of tall oil fatty acids and resin acids as found in crude or distilled tall oil is disproportionated to reduce the amount of abietic type acids and linoleic type acids and treated with acid catalyzed formaldehyde or paraformaldehyde. The disproportionation and aldehyde treatment can occur in sequence or simultaneously. Emulsifiers prepared by the invention process minimize prefloc in latex production and improve rubber physicals.

Abstract: Poly(aldehyde aminosilicon acid) resinous products are produced by reacting an aminosilicon acid compound with an aldehyde compound.

Abstract: Coating compositions comprising methylolamino compounds are cured with high molecular weight fatty diols and higher polyols.

Abstract: An additive for reducing the amount of water necessary in forming a pourable aqueous calcined gypsum slurry, the additive comprising a high potassium salt of a condensation product of naphthalene and sulfonic acid having a molecular weight between about 300 and 3,000. Aqueous plaster slurries containing the additive are pourable, moldable and castable with much less excess water than ordinarily required, resulting in dried cast products of increased strength and other physical property benefits.

Abstract: Oxymethylene copolymers molding compositions with low portions of residual formaldehyde are produced by heating the polymerizate melts treated with chemical stabilizers in an apparatus in which there are continuously presented new polymerizate surfaces under reduced pressure. The heating of the polymerizate melt takes place in a thin layer evaporator for highly viscous media during an average residence time of 30 to 120 seconds at an average rate of shear between 500 and 2000 s.sup.-1 and at a pressure P.sub.abs of at most 150 mbar. The escaping gases and vapors are drawn off countercurrent to the polymerizate melt.

Abstract: The alkali metal, ammonium and alkanol ammonium salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions but depolymerize in mildly acidic media, making the polymer fragments more readily biodegradable in waste streams. Such polymeric acetal carboxylates can now be made by a process which comprises bringing together in a reaction zone under polymerization conditions an ester of glyoxylic acid and a polymerization initiator, and adding to the resulting polymer an alkyl vinyl ether and an organoaluminum compound to stabilize the resulting polymer against rapid depolymerization in alkaline solution. The preferred alkyl vinyl ether is ethyl vinyl ether, and the preferred organoaluminum compounds are alkyl aluminum halides and trialkyl aluminum.

Abstract: The alkali metal, ammonium and alkanol ammonium salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions but depolymerize in acid media, making the polymer fragments more readily biodegradable in waste streams. Such polymeric acetal carboxylates can now be made by a process which comprises bringing together in a reaction zone under polymerization conditions an ester of glyoxylic acid and a molecular sieve, and adding an alkyl vinyl ether to the resulting polymer in the presence of the molecular sieve to stabilize the polymer against rapid depolymerization in alkaline solution. The preferred alkyl vinyl ether is ethyl vinyl ether.

Abstract: A process, and the composition therefrom, is provided for crosslinking of polymers containing hydroxy or mercaptan groups by reaction with polyaldehyde compounds, the crosslinks being thermally labile.

Abstract: Oxymethylene polymers (POM) are obtained in a granular form, by cooling a POM solution or dispersion, whose temperature is above the sintering temperature of the POM, to a temperature slightly below the sintering temperature of the POM, and extracting from the suspension obtained only those POM particles which show a grain diameter of more than 70 .mu.m. As solvent or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water with a methanol content of at least 75% by weight. The POM obtained is suitable as engineering plastic material for the manufacture of shaped articles having improved mechanical properties.

Abstract: This invention relates to mixtures of formose, aminoplast monomers and optionally water and/or crystalline mono or disaccharides. The mixtures are relatively low viscosity liquids at room temperature. The invention also relates to the use of such mixtures for the production of polyurethane resins, in particular foam resins.

Abstract: Oxymethylene polymers are obtained in a granular form by cooling a solution or dispersion of an oxymethylene polymer, the temperature of which solution or dispersion is above the sintering temperature of the oxymethylene polymer, to a temperature just below the sintering temperature of the oxymethylene polymer. As dissolving or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water having a methanol content of at least 75% by weight. The oxymethylene polymer obtained is suitable as engineering plastic for preparing moulded articles.

Abstract: Ether and acetal carboxylates useful as detergent builders to replace sodium tripolyphosphate (STP) in detergent formulations are known to the art. Certain polymeric polycarboxylates are also known to the art but all of these products suffer from either having poor builder properties or they are not readily biodegradable. According to the present invention, new and novel polyacetal carboxylates are provided which are stable under laundry use conditions, but depolymerize in acid media, making the fragments more readily biodegradable in waste streams.

Abstract: A polymeric formal having the general formula ##STR1## wherein p is 0 or 1, n is a positive integer from 2 to 200 and R represents optionally halogen-substituted straight-chained or branched-chained alkyl radicals having 3 to 8 carbon atoms, an aryl radical or an aralkyl radical which can be substituted on one or both sides with alkyl or hydroxyalkyl ether groups; improved methods for the preparation of such formals, tetrabromoxylylene-bis-(.beta.-hydroxyethylether) compounds employed in the preparation of such formals and the use of such polymeric and oligomeric formals as flame retardant agents in plastic compositions especially thermoplastic and polycondensation plastic compositions.

Abstract: Novel polyacetal polymers are presented. The polymers provide outstanding renewable soil release, anti-soil redeposition and anti-static properties when applied to natural and synthetic textile substrates, especially textile substrates containing polyester fibers.

Abstract: A process, and the composition therefrom, is provided for crosslinking of polymers containing hydroxy or mercaptan groups by reaction with polyaldehyde compounds, the crosslinks being thermally labile.