Abstract: Stable aqueous microdispersions of finely divided polyamide resin particles and methods for the manufacture thereof are provided. The properties of these microdispersions are achieved by the addition thereto of an effective amount of a co-surfactant such as a lower alkyl alcohol. The provided microdispersions can be drawn into films which will form clear, continuous films at ambient or near-ambient temperatures regardless of the softening point of the polyamide resin. Dispersions according to this invention find use in hot melt adhesives, coatings, inks, and the like.

Abstract: Conductive, polymeric, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric, pressure-sensitive adhesive microparticles having an average diameter of at least about 1 micrometer, said microparticles having an ionic conductive material present on said surface, and anti-static pressure-sensitive adhesive tapes made therefrom.

Abstract: Disclosed is a semiconductor device-encapsulating epoxy resin composition comprising (i) an epoxy resin (A) containing at least one of a bifunctional epoxy resin (a1) having a biphenyl skeleton and a bifunctional epoxy resin (a2) having a naphthalene skeleton, (ii) a curing agent (B), and (iii) a filler containing fused silica (C) having a specified kind and specified mean particle diameter. This composition has an excellent heat resistance of solder, and further reliability after thermal cycles and reliability after solder-bath dipping.

Abstract: A porous and spherical silica is recovered in high yields from a neutralized product of an alkali silicate obtained by using an acrylamide type polymer as a coagulation growing agent, and the above silica is reacted as a precursor with a metal compound of the Group II of periodic table in an aqueous medium to obtain amorphous or fine, laminar and crystalline porous and spherical silica or silicate granules having a high degree of true sphericality, a symmetrical grain size distribution and a refractive index over a range of from 1.4 to 1.7. The porous and spherical granules have a primary grain diameter of 0.3 to 30 .mu.m as observed through an electron microscope, have an apparent specific gravity of from 0.05 to 0.5 g/ml, and are cheaply obtained in high yields, and can hence be used as a filler for various paints and resins.

Abstract: A powder composition of iron-based powder particles to which is bonded a polymeric material is prepared by making a dry admixture of the iron-based particles and particles of the polymer, wetting the admixture with a solvent for the polymeric material, and removing the solvent to leave a flowable powder composition. The powder compositions can be compression molded, generally at a temperature above the glass transition temperature of the polymer, to form magnetic core components.

Abstract: Gas phase polymerization processes are disclosed which utilize unsupported soluble transition metal coordination catalysts. The catalysts are introduced into the reactor as a solution.

Abstract: An electro-responsive elastomeric material comprising (A) an electrically insulating polymer having a specific modulus of elasticity and (B) a fine powder dispersed in the polymer which electrically polarizes under an electric field independent of water changes its viscoelasticity upon voltage application. The powder has a mean particle size of 0.5 to 500 .mu.m and is (1) a fine carbonaceous powder having a C/H atomic ratio of from 1.2 to 5, (2) composite particles having minute particulates of an insulating material dispersed in a matrix phase of a carbonaceous or carbide material, (3) composite particles having minute particulates of a carbonaceous or carbide material dispersed in a matrix phase of an insulating material, or (4) a fine composite powder of a stratum clay mineral having a two-dimensional stratum structure with a carbonaceous or carbide material incorporated between the strata.

Abstract: Light-stabilized polymer microparticles, which contain at least one light stabilizer, and processes for the preparation of these microparticles by polymerization of suitable monomers, at least a part of the polymerization being carried out in the presence of at least one light stabilizer, are described. The polymer microparticles can be used in coating compositions which comprise a disperse phase containing these particles and a liquid continuous phase.Coatings and finishes based on the compositions according to the invention are distinguished by improved weathering resistance, in particular by a high light stability.

Abstract: A powder composition of iron-based powder particles to which is bonded a polymeric material is prepared by making a dry admixture of the iron-based particles and particles of the polymer, wetting the admixture with a solvent for the polymeric material, and removing the solvent to leave a flowable powder composition. The powder compositions can be compression molded, generally at a temperature above the glass transition temperature of the polymer, to form magnetic core components.

Abstract: An antistatic molded article of monomer-cast nylon, which contains from 2 to 40% by weight of spherical or substantially spherical fine carbon particles having a specific gravity of from 1.4 to 1.6 and an average particle size of from 5 to 25 .mu.m.

Abstract: A photohardenable composition comprises a microgel carrying a group of the formula (I) or (II); or a microgel carrying a group of the formula (III) and at least one acidic group, such as --SO.sub.3 H, --CONHSO.sub.2, --OCO--NH'SO.sub.2 --, --CONHCO--, --SO.sub.2 NH--, a phenolic hydroxyl group and/or --COCH.sub.2 COO--: ##STR1## (wherein R.sup.1 and R.sup.2 each represents a hydrogen atom, a halogen atom, or an alkyl or aryl group, provided that R.sup.1 and R.sup.2 may form a ring together with the carbon atoms to which they are bonded; R.sup.3 represents a hydrogen atom or a methyl group; R.sup.4, R.sup.5 and R.sup.6 each represents a hydrogen atom, a halogen atom, or a substituted or unsubstituted C.sub.1 to C.sub.20 alkyl, aryl, alkoxy or aryloxy group; X.sup.1 represents --CO--O--, --CO--NH-- or --O--; andY.sup.1 represents, for instance, a single bond or a methylene group).

Abstract: Fibrous water-wet nitrocellulose containing 4.5 to 5.5% moisture sprayed with a solvent/cosolvent mixture converts to spheroid, densified nitrocellulose via bilateral agitation. A free-flowing dust-free product having a lower burn rate is produced which dissolves more rapidly for lacquer production. A preferred apparatus is an orbital shaker and a preferred solvent/cosolvent is isopropyl acetate/isopropyl alcohol.

Abstract: A semiconductor encapsulating epoxy resin composition comprising an epoxy resin, a curing agent, and an inorganic filler is improved in melt flow and moldability when the filler comprises spherical silica having a mean particle size of 5 to 35 .mu.m and a specific surface area of up to 1.4 m.sup.2 /g. A mixture of (A) spherical silica having a mean particle size of 0.1 to 2 .mu.m, and (C) ground silica having a mean particle size of 2 to 15 .mu.m is also useful as the filler. A cured product thereof has a low coefficient of expansion and improved crack resistance upon soldering after moisture absorption.

Abstract: A finely-divided, monomodal protective-colloid stabilized aqueous dispersion of a copolymer of at least 75% by weight of units of vinyl chloride and ethylene and optionally copolymerized with up to 25% by weight of units of additional monomers unsaturated at the ethylene bond and having a solids content of 45 to 70% by weight, characterized in that the dispersions are not partially flocculated, the polymer has a mean particle size of 150 to 500 nm measured as mean weight in a disc centrifuge and a polydispersion index of not more than 1.8 and less than 50% of the polymer particles are larger than 1,000 nm and a process for the preparation thereof using a single step radical polymerization of vinyl chloride, ethylene and optionally additional monomers such as vinyl esters useful as dispersion powders, adhesives, binders and concrete additives.

Abstract: A coating composition and method of use thereof for coating metal substrates, especially galvanically active metals, containing a resinous organic polymer, a corrosion inhibiting leachable pigment and an ion reactive pigment generally in the form of metallic spheroid particles. Coated materials have improved corrosion resistance.

Abstract: Fibers formed of a blend of metal oxide, such as titanium or zirconium oxide, with etheric phosphazene are formed by preparing solutions of etheric phosphazene and inorganic alkoxides, such as titanium isopropoxide. The solutions are then formed into fibers and cured at room temperature or with moderate heating. Fibers produced can be extensible, tough, hard, flexible, or brittle. They are multicomponent blends of the titaninum or zirconium oxide and phosphazene. The composite may be doped with low lattice energy salts to form conductive fibers.

Abstract: A composition for use in injection molding powder metallurgy, is provided by applying mechanical sphericalization to a metal powder of an irregular shape and having an average grain size of not more than 50 .mu.m to form a sphericalized metal powder, and then mixing and kneading a binder of not more than 9 parts by volume relative to 11 parts by volume of the sphericalized metal powder.

Abstract: A process for producing an antistatic molded article of monomer-cast nylon, which contains from 2 to 40% by weight of spherical or substantially spherical fine carbon particles having a specific gravity of from 1.4 to 1.6 and an average particle size of from 5 to 25 .mu.m.

Abstract: A film-forming, self-crosslinking aqueous synthetic resin dispersion with reduced liberation of formaldehyde contains an emulsion polymer composed of(A) a major portion of an ethylenically unsaturated, free radically polymerizable monomer giving a polymer or copolymer with a glass transition temperature not exceeding 120.degree. C.,(B) N-methylolacrylamide or methacrylamide,(C) optionally further ethylenically unsaturated, free radically polymerizable monomers, and(D) an ethylenically unsaturated, free radically polymerizable monomer carrying a ureido group.

Abstract: Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric pressure-sensitive adhesive microspheres having an average diameter of at least about 1 micrometer. Preferred microspheres are those wherein a majority of the hollow microspheres contain at least one of interior void having a diameter of at least 10% of the diameter of the microsphere.These hollow microspheres are useful as repositionable pressure-sensitive adhesives. The invention also provides pressure-sensitive adhesives consisting essentially of such hollow microspheres. Aqueous suspensions of these microspheres, processes for their preparation, spray repositionable pressure-sensitive adhesive compositions, and microsphere-coated sheet materials are also provided. Surprisingly, hollow microspheres of the invention show reduced or even eliminated adhesive transfer, in comparison with prior art repositionable pressure-sensitive adhesives which are based on solid microspheres.

Abstract: Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric pressure-sensitive adhesive microspheres having an average diameter of at least about 1 micrometer. Preferred microspheres are those wherein a majority of the hollow microspheres contain at least one of interior void having a diamter of at least 10% of the diameter of the microsphere.These hollow microspheres are useful as repositionable pressure-sensitive adhesives. The invention also provides pressure-sensitive adhesives consisting essentially of such hollow microspheres. Aqueous suspensions of these microspheres, processes for their preparation, spray repositionable pressure-sensitive adhesive compositions, and microsphere-coated sheet materials are also provided. Surprisingly, hollow microspheres of the invention show reduced or even eliminated adhesive transfer, in comparison with prior art repositionable pressure-sensitive adhesives which are based on solid microspheres.

Abstract: Flame-resistant, expandable styrene polymers containing a styrene (co)polymer, from 0.4 to 6% by weight of hexabromocyclododecane having a mean particle size of from 1 to 50 .mu.m, the particles being provided with a firm coating which has a thickness of from 1/100 to 1/10 of the particle diameter and is insoluble in water and styrene, from 1 to 10% by weight of a C.sub.3 - to C.sub.6 -hydrocarbon as blowing agent, and, if desired, customary additives, are distinguished by a reduced internal water content and can be processed to form foams which have an improved foam structure and high UV stability.

Abstract: Compositions comprising microparticles of a cross-linkable, glyoxalated (meth)acrylamide containing, polymeric material are disclosed. They are prepared using inverse mircoemulsion polymerization techniques and are useful as wet- and dry-strength agents in paper production.

Abstract: Disclosed is a polyamide-imide resin paste which comprises polyamide-imide resin solution dissolved in a non-nitrogen-containing solvent, wherein resin fine particles are dispersed in the solution in an amount of 1 to 50% by weight relative to the resulting polyamide-imide resin paste.According to the present invention, there can be provided a paste which does not cause any clogging of screen due to adhesion of the paste even in repeated printings over a long period of time and shows an excellent mechanical stability of a paste in printing.

Abstract: A resin dispersion type aqueous coating composition comprising a continuous phase of water medium and an aqueous resin and water insoluble resin microparticles uniformly dispersed, as a discontinuous phase, in said continuous phase, which is characterized in that said water insoluble resin is prepared by the reaction of a resin which is liquid at room temperatures and bears in its molecule functional groups capable of reacting with an epoxy or isocyanate group, and an epoxy compound or an isocyanate compound so as to give 10.about.100% reaction rate of the epoxy or isocyanate group contained in said compound. The present aqueous coating composition is excellent in its application characteristics and can give a coating with excellent gloss and smoothness.

Abstract: Mannich (alk)acrylamide microparticles are produced at high solids contents without a significant increase in bulk viscosity by inverse microemulsion polymerization and provide superior dewatering characteristics.

Abstract: Functionalized polymer microparticles having particle diameters of from about 200 to about 4000.ANG. are prepared and are useful in facilitating a variety of flocculation and thickening of dispersions of suspended solids applications.

Abstract: A process for preparing microspheres using very cold temperatures to freeze polymer-biologically active agent mixtures into polymeric microspheres with very high retention of biological activity and material. Polymer is dissolved in a solvent together with an active agent that can be either dissolved in the solvent or dispersed in the solvent in the form of microparticles. The polymer/active agent mixture is atomized into a vessel containing a liquid non-solvent, alone or frozen and overlayed with a liquified gas, at a temperature below the freezing point of the polymer/active agent solution. The cold liquified gas or liquid immediately freezes the polymer droplets. As the droplets and non-solvent for the polymer is warmed, the solvent in the droplets thaws and is extracted into the non-solvent, resulting in hardened microspheres.

Abstract: The invention provides a blend of metal oxide, such as silicon oxide, with etheric phosphazene. The invention optionally contains salt for antistatic coatings. The composition of the invention is formed by preparing solutions of etheric phosphazene and alkoxysilane, such as tetraethoxysilane. The solutions are then coated onto suitable substrates, or cast films and cured at room temperature or with moderate heating. The coatings and films produced are transparent, tough, hard, and flexible. They are multicomponent blends of the silicon oxide and phosphazene. It is also within the invention to form the blends with other metal oxides, rather than silicon, such as titanium, aluminum, or zirconium. The composite may be doped with low lattice energy salts to form antistatic composites.

Abstract: An orthodontic appliance adhesive has a plurality of glass spheres maintained therein. The glass spheres are coated with a release agent which repels the resin of the adhesive, causing the glass spheres to define effective voids within the adhesive when it is cured. These voids facilitate fracture of the adhesive composite. The beads further provide for a uniform spacing between an orthodontal bracket and a tooth when the adhesive is used for such bonding.

Abstract: A liquid silicone rubber composition capable of yielding a thermally conductive elastomer which comprises an organopolysiloxane capable of reaction with an organohydrogenpolysiloxane having at least two .tbd.SiH bonds, two types of alumina powders having, respectively, defined average sizes, and a catalytic amount of platinum or a platinum compound used as a catalyst for the reaction between the organopolysiloxane and the organohydrogenpolysiloxane.

Abstract: A repositionable pressure-sensitive adhesive comprising from about 70% to about 99% hollow, polymeric, acrylate, inherently tacky, infusible, solvent-insoluble, solvent-dispersible, elastomeric microspheres comprising at least one alkyl acrylate or alkyl methacrylate ester, a majority of the microspheres having one or more interior voids having a diameter of at least about 10% of the diameter of the microsphere, and correspondingly, from about 30% to about 1% of a binder copolymer comprising an elastomeric polymeric backbone having pendant therefrom high Tg polymeric moieties.

Abstract: Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric, nitrogen-containing, acid-free pressure-sensitive adhesive microspheres having an average diameter of at least about 1 micrometer wherein a majority of the microspheres contain multiple interior voids, a majority of the voids having a diameter of less than about 10% of the diameter of the microsphere, the total of the diameters of the voids being at least about 10% of the diameter of the microsphere.These hollow microspheres are useful as repositionable pressure-sensitive adhesives. The invention also provides pressure-sensitive adhesives consisting essentially of such acid-free hollow microspheres. Aqueous suspensions of these microspheres, processes for their preparation, spray repositionable pressure-sensitive adhesive compositions, and pressure-sensitive adhesive coated sheet materials are also provided.

Abstract: Monodisperse, polymeric microspheres are formed by injecting uniformly shaped droplets of radiation polymerizable monomers, preferably a biocompatible monomer, having covalent binding sites such as hydroxyethylmethacrylate, into a zone, impressing a like charge on the droplet so that they mutually repel each other, spheroidizing the droplets within the zone and collecting the droplets in a pool of cryogenic liquid. As the droplets enter the liquid, they freeze into solid, glassy microspheres, which vaporizes a portion of the cryogenic liquid to form a layer. The like-charged microspheres, suspended within the layer, move to the edge of the vessel holding the pool, are discharged, fall and are collected. The collected microspheres are irradiated while frozen in the cryogenic liquid to form latent free radicals. The frozen microspheres are then slowly thawed to activate the free radicals which polymerize the monomer to form evenly-sized, evenly-shaped, monodisperse polymeric microspheres.

Abstract: A rubber composition, which forms a vulcanizate having excellent surface properties such as pleasant feeling of touch and slipperiness or lubricity, comprises, in addition to conventional ingredients such as an ethylene-propylene copolymer, organopolysiloxane, reinforcing silica filler, process oil and curing agent, a powder of spherical particles, such as a poly(methyl silsesquioxane) powder, in the form having a particle diameter of 0.1 .mu.m to 50 .mu.m in a limited amount. The rubber composition forms a spongy rubber vulcanizate when vulcanized in the presence of a blowing agent which, by virtue of excellent surface properties, is useful as powder puffs for make-up.

Abstract: Hollow, polymeric, acrylate, infusible, inherently tacky, solvent-insoluble, solvent-dispersible, elastomeric, nitrogen-containing, acid-free pressure-sensitive adhesive microspheres having an average diameter of at least about 1 micrometer wherein a majority of the microspheres contain multiple interior voids, a majority of the voids having a diameter of less than about 10% of the diameter of the microspheres, the total of the diameters of the voids being at least about 10% of the diameter of the microsphere.These hollow microspheres are useful as repositionable pressure-sensitive adhesives. The invention also provides pressure-sensitive adhesives consisting essentially of such acid-free hollow microspheres. Aqueous suspensions of these microspheres, processes for their preparation, spray repositionable pressure-sensitive adhesive compositions, and pressure-sensitive adhesive coated sheet materials are also provided.

Abstract: A solid stabilizer composition for organic polymers is formed by a solid, continuous phase and by a dispersed phase in said continuous phase, wherein the continuous phase is constituted by amorphous tetrakis-[3-(3,5-di-tert.-butyl-4-hydroxyphenyl)-propionyloxymethyl]-metha ne and the dispersed phase is constituted by an either amorphous or crystalline organic phosphite, in the form of particles with a particle size of from 10 .mu.m to 2 mm, with the weight ratio of said continuous phase to said dispersed phase being comprised within the range of from 9:1 to 1:9.The processes for preparing said solid stabilizer composition and its use in the stabilization of organic polymers are disclosed.

Abstract: Functionalized polymer microparticles having particle diameters of from about 200 to about 4000 .ANG. are prepared and are useful in facilitating a variety of flocculation and thickening of dispersions of suspended solids applications.

Abstract: Mannich (alk)acrylamide microparticles are produced at high solids contents without a significant increase in bulk viscosity by inverse microemulsion polymerization and provide superior dewatering characteristics.

Abstract: Compositions comprising microparticles of a cross-linkable, glyoxalated (meth) acrylamide containing, polymeric material are disclosed. They are prepared using inverse microemulsion polymerization techniques and are useful as wet- and dry-strength agents in paper production.

Abstract: A low warp, filled polyoxymethylene composition comprises a bimodal distribution of glass beads.

Abstract: The coating is constituted by a uniform mixture of solvent-free epoxy resin containing the usual additives, solid glass microbeads, and pigment-colored aluminum flakes, said coating thus being pigmented in its bulk, translucent, and glittering in durable manner. The flakes are advantageously colored using a colored and irridescent epoxy varnish. The coating is suitable for application in a single coat and the single coat may be from 1 mm to 5 mm thick. It is obtained by spreading the uniform mixture of the various components on a key-providing undercoat which is initially applied to the surface to be coated. The mixture is obtained by using pre-measured quantities.

Abstract: The present invention comprises a solid composition having low magnetic signature. The composition comprises a plurality of high density, very low magnetic signature bodies or particles incorporated in a non-magnetic matrix of lesser density.

Abstract: A lightweight synthetic stucco composition is disclosed which includes a mixture comprising a latex emulsion, water and titanium dioxide as well as a number of additives for adjusting the properties of the mixture and further including an admixture of hollow microspheres and macrospheres, with the microspheres having a diameter of about 10 to 150 microns and the macrospheres having a diameter of from 300 to 2000 microns, the admixture comprising between 30 and 60% of the finished composition. Utilizing a mixture of microspheres and macrospheres produces a substantial weight savings which makes the synthetic stucco composition easier to apply, less costly to transport and less demanding on the structure of the building.

Abstract: A method is provided for the preparation of stable aqueous dispersions of non-solvated, un-neutralized, low amine, low acid number polymerized fatty acid polyamide resins. In the preferred method of this invention, a polymerized fatty acid polyamide resin which has been prepared so as to have a low acid and low amine number is liquified by heating the polyamide resin to a temperature where it is at or above its melting point. The liquified polymerized fatty acid polyamide resin is then blended with a predetermined amount of water which is heated to a temperature such that the resulting blend will have a temperature above the melting point of the polyamide resin. A cationic surfactant which is the salt of the amine of the formula:R--NH--CH.sub.2).sub.n.sbsb.1 (NH--CH.sub.2).sub.n.sbsb.2).sub.n.sbsb.3 NH.sub.2wherein R represents an alkyl having 16-20 carbon atoms and n.sub.1 and n.sub.2 are the same or different and each represents a whole number from 1-3 and n.sub.3 is 0 or 1, is included in the mixture.

Abstract: A method is provided for the preparation of stable aqeuous dispersions of non-solvated, un-neutralized, low amine, low acid number polymerized fatty acid polyamider resins. In the preferred method of this invention, a polymerized fatty acid polyamide resin which has been prepared so as to have a low acid and low amine number is liquefied by heating the polyamide resin to a temperature where it is at or above its melting point. The liquified polymerized fatty acid polyamide resin is then blended with a predetermined amount of water which is heated to a temperature such that the resulting blend will have a temperature above the melting point of the polyamide resin. A cationic surfactant which is the salt of the amide of the formula:R--NH--CH.sub.2).sub.n.sbsb.1 (NH--CH.sub.2).sub.n.sbsb.2).sub.n.sbsb.3 NH.sub.2wherein R represents an alkyl having 16-20 carbon atoms and n.sub.1 and n.sub.2 are the same or different and each represents a whole number from 1-3 and n.sub.3 is 0 or 1, is included in the mixture.

Abstract: A trowelable ablative coating composition is disclosed. The composition comprises an epoxy resin, an amide curing agent, glass microspheres and ground cork. A method for protecting a substrate is also disclosed. The method comprises applying the trowelable ablative coating discussed above to a substrate and curing the coating composition.

Abstract: A two component water-based composition which cures in two stages, an initial rapid curing stage and a slower curing stage, comprising as the first component, a mixture of a polyaldehyde chosen from the group consisting of glyoxal glutaraldehyde and derivatives of glyoxal and gluteraldehyde, and a water dispersible component chosen from the group consisting of poxy resin emulsions which can be emulsified in water, synthetic latexes stable at about pH 7 or less, low molecular weight resin emulsions, epoxy ester emulsions, water emulsified alkyds, and cationic, anionic and non-ionic asphalt emulsions and, as the second component, the non-gel reaction product of N,N'-bis(methoxymethyl) uron and a polyamine chosen from a group consisting of primary and secondary amines and/or a monoamine.

Abstract: A low warp, filled polyoxymethylene composition comprises a bimodal distribution of glass beads.

Abstract: Suspension polymerization of acrolein type compounds in the presence of appropriate surfactants results in the formation of microspheres in size ranging from 0.03 to 80 microns. Fluorescent and magnetic microspheres are obtained by carrying out the same polymerization in the presence of appropriate fluorochromic or ferrofluidic compounds, respectively. Hybrido-polyacrolein microspheres are obtained by grafting one type of such microspheres on another type. Immunomicrospheres were formed by binding covalently at physiological pH appropriate proteins to the microspheres. The immunomicrospheres can be used for various biological applications, such as specific markers for labeling cell surface receptors, for cell separation, for diagnostic purposes, etc.