Abstract: Acid-curable furfuryl alcohol prepolymer binders have improved properties when admixed with a dibasic acid di-ester of the compositionR.sup.1 O.sub.2 C(CH.sub.2).sub.n CO.sub.2 R.sup.2when n is from 1 to 8, R.sup.1 is furfuryl, and R.sup.2 is furfuryl or methyl. The diesters are preferably added in the amount of 5-35% by weight of total composition. These compositions are particularly useful in the preparation of sand cores and molds for foundry use which have improved strength and hardness. These furfuryl esters are also acid-curable and can be used alone as resin binders.

Abstract: A resin composition comprising(I) a granular or powdery resin which is a condensation product of a phenol, an aldehyde and optionally a nitrogen-containing compound having at least two active hydrogens and is characterized by (A) containing spherical primary particles and their secondary agglomerated particles each having a particle diameter of 0.1 to 150 microns, (B) having such a size that at least 50% by weight thereof can pass through a 100 Tyler mesh sieve, and (C) having a free phenol content, determined by liquid chromatography, of not more than 500 ppm, and(II) at least one member selected from the group consisting of (1) a rubbery elastic material, (2) a thermoplastic resin and (3) a curable reisn other than said granular or powdery resin (I) and/or a filler material other than said granular or powdery resin (I).

Abstract: An aqueous solution of a resin glue comprising formaldehyde, urea, melamine and phenol is obtained when phenol, formaldehyde and not more than 0.35 mole of an alkali metal bisulfite per mole of phenol are reacted to give a phenol-formaldehyde condensate, formaldehyde and urea in a molar ratio of not more than 2.5 are reacted to give a urea-formaldehyde condensate, and the reaction products are in turn reacted with melamine and formaldehyde.

Abstract: An acidproof lining material consisting of natural amorphous graphite, novolac and resol phenol-formaldehyde resin and a hardener, with the ratio of the components being as follows (in % by weight):______________________________________ natural amorphous graphite 70-80 novolac phenol-formaldehyde resin 9-22.5 hardener I-2.5 resol phenol-formaldehyde resin 5-15.

Abstract: Adhesive compositions are described which consist of an adhesive base as a first part and an initiator portion as a second part, said first part consisting essentially of (a) 100 parts by weight of a polymerizable monomer having at least one .alpha.,.beta.-unsaturated carboxyl functionality; (b) as an accelerator, about 0.05 to 20 parts by weight of a compound selected from the group consisting of organic sulfimides and perfluoroalkylsulfonanilides; and (c) an inhibitor of free-radical polymerization; and the second part comprising a condensation reaction product of an aldehyde and a primary or secondary amine. These compositions may be formulated as adhesives which, for example, exhibit pressure-sensitive properties, which are particularly suitable in hot-melt applications, or which are particularly suitable as structural adhesives. Bonding methods are also described herein.

Abstract: An aqueous coating composition comprising from 45 to 98 parts by weight (solids) of aqueous resin(s) and from 2 to 55 parts by weight (solids) of finely divided water-insoluble resin(s), in which at least a part of said aqueous resin is selected from amphoteric resins having both carboxyl and amino groups. The resins may have mutually reactive functional groups.

Abstract: An aqueous coating composition comprising from 45 to 98 parts by weight (solids) of aqueous resin(s) and from 2 to 55 parts by weight (solids) of finely divided water-insoluble resin(s), in which at least a part of said aqueous resin is selected from special type of cationic resins. The resins may have mutually reactive functional groups.

Abstract: The cure of resin compositions comprising a mixture of a resole type phenol aldehyde resin and a novolac type phenol formaldehyde resin is improved by employing resorcinol as all or part of the phenolic component in the novolac type resin. The resin compositions are particularly useful as binders for foundry sand.

Abstract: This invention relates to a powdered phenolic resin composition suitable for the production of dry processed resinbonded felt. The phenolic resin composition imparts a good release of the felt from the heated platen or belt and has a rapid cure rate. The powdered phenolic composition is composed of a novolac type phenolic resin, or a mixture of novolac and resole type with an aromatic carboxylic acid as an additive. The resin mixture has a bulk density of 0.29-0.36 gm/cm.sup.3, and contains 0.3-5 parts by weight of the aromatic carboxylic acid to 100 parts by weight of phenolic resin. Said aromatic carboxylic acid has the formulaR--Ar--COOHwhereinR is selected from hydrogen, hydroxy or alkoxy groups, andAr is selected from phenyl, phenylalkenyl or phenylalkyl groups.

Abstract: Described are water reducible coating compositions comprising (A) an organosilane-polyol which is the reaction product of a hydrophilic polycarbinol and an organosilicon material selected from the group consisting of an organosilane, a hydrolyzed and condensed organosilane and mixture, thereof; and (B) a curing agent for the coating compositions.

Abstract: A process for producing a colloidal solution of a curable resin which comprises:blending (a) 5 to 90% by weight of a polyfunctional maleimide component and (b) 95 to 10% by weight of at least one thermosetting resin,heating them to form a composition, andblending the resulting composition with at least one low boiling point solvent having a boiling point of more than room temperature and less than 150.degree. C., in which the thermosetting resin is rich soluble, but the maleimide component is poor soluble, thereby forming a colloidal solution of a curable resin is disclosed. The colloidal solution is used as a coating, as an impregnating agent for a coil, or for preparing prepreg.

Abstract: This invention relates to storage stable, solvent-free thermosetting polyurethane-based molding compositions which contain a fibrous reinforcing material, to a process for their production and to the production of fiber-reinforced moldings using these molding compositions.

Abstract: Aqueous dispersions of a phenolic resole and a thermoplastics polymeric material or a rubber, suitable for use as adhesives, are prepared by(a) dissolving a solid thermoplastics polymeric material, such as a polyvinyl acetal or a nylon polyamide, or rubber in a phenol,(b) adding a nonionic or anionic surface active agent and/or protective colloid,(c) adjusting the mixture to a pH above 7 by addition of a base,(d) adding aqueous formaldehyde solution, or a formaldehyde donor, to a molar ratio of phenol to formaldehyde within the range 1:1 to 1:3,(e) if necessary, adding water, and(f) heating the mixture to form a phenolic resole.

Abstract: A composition based on epihalohydrin elastomers comprises from 12 to 125 parts, preferably from 25 to 75 parts, of a suitable tackifier, and from 25 to 150 parts, preferably from 30 to 100 parts, of a particulate filler per 100 parts by weight of elastomer. The tackifier contains polar moieties for compatibility with the elastomer and is preferably a phenolic, modified phenolic, coumarone-indene or polyketone resin. The filler is preferably an inorganic material such as alumina trihydrate, silica, or iron oxide. These composition have useful adhesive and surprising stress-grading properties and are thus suitable for use with heat-recoverable articles in the terminatiion, connection, and encapsulation of high voltage electrical apparatus.

Abstract: A composition capable of cleaning and protecting the surface of a substrate and of rendering it shiny, without subsequent polishing, comprising an aqueous system containing, in specified concentrations, a solid film forming high molecular weight acrylic polymer, a non-film forming resinous material, a plasticizing agent, a fluorocarbon surfactant and a blend of ether alcohol component and isopropanol in a pre-determined concentration range, the latter blend and the concentration of alcohol therein being primarily responsible for providing the substantially improved cleaning ability of the instant compositions.

Abstract: Economical durable molded articles are prepared by mixing a hardenable resin system, gypsum filler and glass fibers, molding the desired article from the mixture, and hardening the molded article by heat or by the use of a hardening agent. The resin system comprises at least one hardenable resin, for example urea formaldehyde resin, and can include a second hardenable resin, for example polyvinyl acetate resin. The gypsum filler may be an economical by-product of phosphate refining. The glass fibers may be an economical by-product from the manufacture of bulk filter media. The constituents of the resin system and their proportions are chosen to impart desired surface finishes to the molded article. Coloring agents and other additives may also be added to affect the surface finish and appearance.

Abstract: A high bond strength, water reducible modified polyester resin composition is disclosed which comprises: (I) a polyester resin consisting essentially of the reaction product of a: (a) aromatic dicarboxylic acid or mixtures thereof; (b) tris (2 hydroxy alkyl) isocyanurate, organic polyhydric alcohol containing more than two hydroxyl groups or mixtures thereof; (c) saturated fatty acid, and (d) tricarboxylic acid and II additive consisting essentially of: (a) 8 wt. % to 30 wt. %, based on 100% polyester solids, of an aqueous solution of a water soluble, unmodified phenol-formaldehyde resin having an average molecular weight of below about 275; and (b) 20 wt. % to 55 wt. %, based on the polyester solids of water soluble urea-formaldehyde condensation products.

Abstract: A composition containing a methylene donor, hydrophobic component containing an organic hydrophobic diluent and an isocyanate; and an aqueous component containing a water compatible aldehyde condensate and use thereof as an impregnant or bonding agent for cellulosic materials including paper, wood and cotton, and/or fibrous materials including synthetic fibers, such as rayon and nylon.

Abstract: A friction material having an excellent heat-resistance, comprises 5 to 70% by weight of pulp-like particles consisting essentially of a heat-resistant aromatic polymeric material; 1 to 70% by weight of a fibrous material comprising at least one member selected from inorganic fibrous materials and heat-resistant organic fibrous materials; 1 to 35% by weight of a friction-regulating agent and; 5 to 40% by weight of a thermosetting polymeric resin.

Abstract: A binder for foundry aggregate capable of being catalytically cured with a polyisocyanate and an alkaline catalyst comprising in combination, as a major portion, a butylated phenol-formaldehyde resin, a lesser amount of a resole resin and a still lesser amount of a novolac resin.

Abstract: Water-thinnable, heat curable binders for coatings are prepared by reacting a polyglycidyl ether of a polyhydric phenol with neutralized sulphanilic acid in a ratio of from 0.9 to 1.1 aminohydrogen equivalents per epoxy equivalent.

Abstract: Resinous compositions which are the Michael adducts of primary and/or secondary amines and polymers containing alpha, beta-ethylenically unsaturated moieties in conjugation with carbonyl moieties are disclosed. The compositions are depositable on substrates to form films. The films are amenable to oxidative and aminoplast cures and cure with light color. The compositions are desirable for use in cationic electrodeposition.