Abstract: Sand molds or cores are prepared by coating sand particles with an acid-curing condensation type resin consisting of poly furfuryl alcohol or admixtures of poly furfuryl alcohol with other acid-curing resins. The resin composition is formed into a desired shape and is cured at ambient temperature over a period of between a few seconds and a few minutes by means of an acid produced by in situ oxidation of sulfur dioxide. Sulfur dioxide is introduced into the molding composition together with an oxidizing agent which effects oxidation of the sulfur dioxide within the mold or core composition. Preferably, the oxidizing agent is an organic peroxide incorporated on the sand or introduced with the resin composition.

Abstract: A fire-resistant construction material is disclosed. This construction material is composed of an incombustible component, ordinarily including flame-retardant and intumescent agents, intimately dispersed and fixed into a rigid panel by a binder of melamine formaldehyde resin.

Abstract: A high carbon friction material for use as a friction lining in a brake or clutch. The friction material consists of a combination of fibers selected from a group including glass, asbestos or other mineral fibers, metal powders, friction modifiers and carbon or graphite particles retained in a matrix created by a thermoset phenolic resin to establish a friction lining. The selected fibers and carbon or graphite particles in the friction material jointly combine to establish a substantially uniform wear rate and coefficient of friction up to 500.degree. C. when the friction lining engages a corresponding mating surface.

Abstract: In the case of polyolefins filled with alkaline earth metal carbonates, a very good compatibility of the hydrophilic filler and the hydrophobic polymer matrix is reached when using as adhesion promoters certain organo-phosphorus compounds. As a result, improved mechanical properties are obtained with the articles made of plastic material that has been prepared from such polyolefin molding compositions.

Abstract: An aqueous dispersion of partially neutralized ethylene/.alpha.,.beta.-ethylenically unsaturated carboxylic acid copolymer having a specific composition distribution of the acidic units is found to have an excellent film-forming property and suitable for coating of various substrates. Articles coated with said aqueous dispersion are improved in various properties such as heat-sealability, oil resistance, water resistance, adhesiveness and so on.

Abstract: A foundry core composition of foundry aggregate, a polyol component or mixture thereof, a polyisocyanate, and as a selected solvent therefor, an acetal or ketal such as butyl acetal. The compositions are suitable for use in cold box, no-bake, and rapid no-bake processes.

Abstract: Molding composition and molded products comprising polybutylene terephthalate containing thermally stable reinforcing fibers, such as glass fibers, having an aspect ratio of at least about 5 and inert filler, such as glass spheres, having an aspect ratio less than about 3. In a preferred embodiment, the composition also includes amorphous, thermally stable resins such as polymethyl methacrylate.

Abstract: A thermosettable resin molding compound for pressure-molding comprises a relatively thin nontacky coat formed on a surface of a solid molding composition comprising a liquid thermosettable resin and a filler.

Abstract: A color sensitive primer comprising 100 parts of an ethylenically unsaturated elastomer; 300 to 800 parts of a phenolic resin, A or B stage; 0 to 100 parts inorganic filler; 10 to 30 parts epoxy resin; about 0.5 to 10 parts heat sensitive dye; and about 0.5 to 3 parts sulfur.

Abstract: Disclosed is mass-dyed linear, saturated, aromatic polyester comprising, as dyestuff, a compound or mixture of compounds selected from those of formulae I and II, ##STR1## wherein R.sub.1 is a radical of formula ##STR2## R.sub.2 is hydrogen or a radical of formula ##STR3## of R.sub.3 and R.sub.3 ', both are hydrogen, or one is hydrogen and the other chlorine or bromine, or both are chlorine or bromine,R.sub.5 is hydrogen, chlorine, bromine or methyl,R.sub.5 ' is hydrogen, chlorine, bromine, nitro or a 4-phenyl, 4-chlorophenyl, 4-bromophenyl or 4-para-nitrophenyl group,R.sub.6 is hydrogen, chlorine or bromineR.sub.6 ' is hydrogen, chlorine, bromine or methyl, andR.sub.7 and R.sub.9 are the same and are chlorine or bromine,With the provisos(i) R.sub.2 is hydrogen when R.sub.1 is a radical (1) or (2) or when R.sub.1 is a radical (3), in which R.sub.5 is phenyl or chloro-, bromo- or nitro-phenyl,(ii) R.sub.3 and R.sub.3 ' are both hydrogen when R.sub.1 is a radical (1), (3) or (4),(iii) R.sub.

Abstract: The present invention relates to a process for preparation of molding resins comprising heating and kneading an isocyanate prepolymer derived from a hydroxyl-terminated polymer and a polyfunctional isocyanate with a hydroxyl-terminated low-molecular-weight polybutylene terephthalate in the presence of reinforcing filler by means of an extruder.

Abstract: A solid industrial polyurethane tire and a wheel assembly comprised of such a tire adhered to a rigid central core, or hub. The hub is generally adaptable to fit onto an axle of an industrial vehicle. Said polyurethane tire is prepared by reacting 2,2'-dithiodianiline with a prepolymer of selected diisocyanates and selected polymeric polyester and polyether polyols and their mixtures.

Abstract: Disclosed is a novel method for determining the degree of cure of polyester and epoxy resins which includes the steps of adding a catalyst, containing a pigment, to the resin; mixing the two components to provide a visually uniform distribution of the catalyst and pigment throughout the resin; and, depositing the mixture in a desired position for curing. The pigment can also be added directly to the resin rather than the catalyst. Additionally, in either alternative, at the completion of the curing the color imparted by the pigment has substantially disappeared from the cured product as though no pigment had been employed. Also disclosed is a novel benzoyl peroxide paste composition, for curing polyester resins, having a pigment the color of which substantially disappears from the cured product.

Abstract: A sand for making cores and moulds which comprises 100 parts by weight of a refractory filler, between 1.0 and 3.0 parts by weight of a binder, and between 0.4 and 2.0 parts by weight of an acid catalyst of crystal hydrate benzene-sulphonic acid in the form of an 80- to 92-percent solution in methyl alcohol.The present invention makes it possible to prepare a sand for making cores and moulds which displays a cold setting rate and strength higher than ever before. The cold setting rate in terms of the time after mixing at which the pattern or corebox can be removed satisfactorily is not over 1 min. and the compression strength of the sand is at least 60 N/cm.sup.2 at the time of removing the pattern or corebox.

Abstract: The adhesion between carbon fibers and unsaturated matrix resins used in the preparation of composite structures is improved by the use of an unsaturated epoxide bifunctional coupling agent. The coupling agent can be applied to the carbon fibers or incorporated into the matrix resin system.

Abstract: A process for preparing a filler-fortified polyalkyleneterphthalate molding composition which comprises mixing a filler with a precondensate of poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate, forming the resultant mixture into a shape and thereafter polymerizing the precondensate by solid-phase condensation under solid-phase condensation conditions; a molding composition prepared by such a process comprising poly-(1,4-butylene)-terephthalate and/or poly-(1,3-propylene)-terephthalate in an amount of 20 to 98 weight percent and 2 to 80 weight percent of a fortifying filler, the amounts based upon the combined amount of polyester and fortifying filler; a shaped object prepared from molding such a molding composition and the process for molding such a molding composition into a molded shaped article.

Abstract: Filled unsaturated ester bulk molding, sheet molding, premix or mat molding compositions are modified with elastomer to give finished products with both improved impact strength and improved surface characteristics. The elastomeric modifier is selected from the group consisting of chloroprene polymers and hydrocarbon polymers such as ethylene/propylene di-, ter-, or tetrapolymers.

Abstract: Reinforced molding compounds are disclosed comprising elastomer modified thermosetting unsaturated polyesters which include conjugated diene butyl rubber elastomer copolymer dispersed therein, and which further include inorganic particulate filler material and a free radical polymerizable monomer. Preferably, they also include a thermoplastic component, and such compounds have improved surface appearance, toughness and impact strength as demonstrated by the molded articles produced from such a low profile system.

Abstract: Methods for preparing reinforced molding compounds are disclosed, comprising preparing a first paste component from a mixture of a thermosetting unsaturated polyester component, a free radical polymerizable monomer component and an inorganic particulate filler component, preparing a second paste component from a conjugated diene butyl elastomer copolymer component, a free radical polymerizable monomer component, and an inorganic particulate filler component, and combining the first and second paste components in order to produce an elastomer modified thermosetting unsaturated polyester molding compound having improved surface appearance, toughness and impact strength. Preferably, one or both of the paste components will include a thermoplastic polymer additive component to provide low profile qualities to the product.

Abstract: An improved process for dispersing alumina trihydrate in a polyester resin is disclosed wherein the improvement comprises reducing the times required to accomplish the gelling and curing of a polyester resin by blending two to ten percent activated alumina, based on the total weight of alumina, with the alumina trihydrate.