Abstract: The present invention provides a process for preparing a thermally very stable polyacetal copolymer having very small unstable terminals even at a high polymerization yield, by the copolymerization of trioxane as the principal monomer with a comonomer copolymerizable therewith, wherein an isopolyacid or an acidic salt thereof is used as a polymerization catalyst; the catalyst can simply be deactivated in a small amount of a deactivator solution after the polymerization; and a washing step is not required. The copolymerization is effected with an isopolyacid or an acidic salt thereof used as a polymerization catalyst until the remaining monomers account for at most 10% by weight of all the fed monomers, and a solution containing a deactivator for the above catalyst is added in an amount of 0.01 to 10% by weight based on the resulting crude polymer to deactivate the catalyst, followed by subjecting the crude polymer intact to a heat-melting treatment without washing it.

Abstract: To provide a resin material greatly improved in rigidity and strength while maintaining or further improving the impact resistance characteristic of a high-impact polystyrene.A long-fiber-reinforced high-impact polystyrene resin structure of at least 3 mm in length is formed by compounding (A) a high-impact polystyrene resin with (B) 8 to 80 wt. % (based on the whole composition) of a fibrous reinforcement blended therewith, the fibrous reinforcement (B) being substantially the same in length as the structure and arrayed substantially in parallel in the lengthwise direction of the structure.

Abstract: Solventless silicone resins, which exhibit a high degree of reconstitution, are produced in forms such as powders and flakes. The degree of reconstitution is judged by the fact that silicone resin/fluid alloys produced therefrom exhibit only a minor shift in T.sub.g, the glass transition temperature, in comparison to analogous alloys produced from solvent dispersed (virgin) resin. Resin, and preferably virgin resin, is dispersed in a volatile liquid dispersant and blended with a nonvolatile silicone fluid. Thereafter, the volatile liquid dispersant is removed by means such as spray-drying or evaporation, resulting in the solventless resin forms of the invention.

Abstract: A liquid, pourable 100% active rheological additive especially useful for thickening organic compositions which in one aspect comprises an active hydrogen containing compound such as a polyol, one or more polycarboxylic acids or isocynanates, and a functional chain ending unit. The additive, which exists in a pourable, pumpable form at up to a 100% as a rheologically active composition, exhibits excellent thickening efficiency for systems including inks, epoxies, polyesters, paints, greases and other systems, including ease of dispersibility, without adversely affecting gloss. The additive may operate by both an associative and a reaction mechanism to provide rheological viscosity properties to such systems, and is also similarly useful for aqueous systems.

Abstract: A crosslinkable waterborne dispersion of a hydroxy functional polydiene polymer composition which comprises: (a) 10 to 65% w of a hydroxy functional polydiene polymer, (b) 0.2 to 25% w of a compatible amino resin, (c) 0.1 to 10% w of a surfactant which is nonionic or anionic and has a volatile cation, and (d) the balance water. The invention also describes a water-continuous process and an inversion processes for making such dispersions.

Abstract: A method for the preparation of a silicone rubber composition, a liquid polydiorganosiloxane (A), finely powdered silica (B), liquid polyorganosiloxane (C) and water (D) are introduced continuously into the raw material inlet of a biaxial continuous extruding and mixing machine. In the present method the liquid polydiorganosiloxane is introduced into the raw material inlet through the outer lumen of a double lumen tube and the finely powdered silica is introduced into the raw material inlet through the inner lumen of the double lumen tube. As a result, the finely powdered silica can be introduced rapidly without being scattered to the surrounding area and superior mixing of the two substances is achieved.

Abstract: The invention relates to a composition based on crosslinkable epoxy-functional organopolysiloxanes. This composition comprises:A. at least 10% by weight of a linear polyorganosiloxane A (POS) of average general formula (II): ##STR1## in which: R.sub.1 is CH.sub.3, R' is an alkylene containing 2 to 50 C, R is an alkyl having from 6 to 26 C, X is R.sub.1, H, --R'-epoxy or hydroxyl, x=40-150, t=3-9, z=0-5 and y=0,B. at least one second crosslinkable epoxy-functional POS (B), B being present in the proportion of at most 90% by weight and corresponding to: B(a) with x=160-1000, t=1-15, z=0-5 and y=0, B(b) with x=0-120, t=10-30, z=0-5 and y=0, or B(c) with x=0-200, t=0-5, z=0-5 and y=10-90,C. and at least one photoinitiator.This composition can be used in the manufacture of protectors for adhesive bodies ("release liners"), papers or plastics or of liner-free self-adhesive labels.

Abstract: A multilayer laminate film comprising (A) a first layer comprising a propylene polymer and oriented in at least one direction, (B) a second layer comprising a propylene copolymer having a melting point lower than the melting point of the propylene polymer of the first layer, (C) a third layer comprising a polymer composition comprising a graft modified olefin polymer in which an unsaturated carboxylic acid or a derivative thereof is grafted, and (D) a fourth layer comprising an ethylene vinyl alcohol copolymer, these four layers being laminated in the above order. The above multilayer laminate exhibits excellent interlaminar adhesion and has excellent heat resistance.

Abstract: The present invention comprises a curable composition comprising:(i) a blocked reactive component comprising a blocked isocyanate or a blocked isothiocyanate;(ii) a functional compound containing reactive hydrogen;(iii) a triorganotin catalyst for promoting the reaction of the blocked reactive component with the functional compound.The composition may also be admixed with water. The invention also relates to a method for curing a blocked isocyanate or blocked isothiocyanate at a temperature below about 150.degree. C. which comprises combining a triorganotin compound with the blocked reactive component and functional compound and heating at a temperature less than about 150.degree. C. to obtain a cured urethane or thiourethane.

Abstract: A glass composite material comprising a polymer chain selected from the group consisting of polysilane, polygermane, polystannane and a copolymer thereof, and a network structure of a metal oxide consisting of a metal atom bonded to the other metal atom through an oxygen atom, wherein the polymer chain is chemically crosslinked with a glass matrix of the network structure of the metal oxide directly or indirectly, and a volume resistivity measured by setting a ratio of a voltage to a film thickness at 10.sup.6 V/cm according to a disc plate electrode method is not more than 3.times.10.sup.6 .OMEGA.cm.

Abstract: An adhesive composition which comprises:(A) 100 parts by weight of a polyorganosiloxane represented by the formula (I): ##STR1## (wherein R.sup.1 s may be the same or different from each other and each represent a monovalent hydrocarbon group or a halogen-substituted hydrocarbon group; and n is a positive integer);(B) 0.5 to 10 parts by weight of a tetraalkoxysilane represented by the following formula:R.sup.2.sub.a Si(OR.sup.3).sub.4-a (II)(wherein R.sup.2 represents an alkyl group having 1 to 3 carbon atoms, a phenyl group or a vinyl group; R.sup.3 represents an alkyl group having 1 to 4 carbon atoms or an alkoxy-substituted alkyl group having 3 to 6 carbon atoms; and a is 0 or 1),or a partially hydrolyzed condensate thereof; and(C) 0.1 to 15 parts by weight of a trialkoxysilane represented by the formula (III):R.sup.4 (R.sup.5).sub.b Si(OR.sup.6).sub.3-b (III)(wherein R.sup.4 represents a substituted or unsubstituted aminoalkyl group; R.sup.

Abstract: Topically applicable sunscreen/cosmetic compositions well suited for enhanced photoprotection of human skin and/or hair against the damaging effects of UV-A and UV-B irradiation, particularly solar radiation, comprise a photoprotecting effective amount of a novel benzotriazole-substituted polyorganosiloxane/polyorganosilane having one of the formulae (1) to (3): ##STR1## wherein A is a monovalent benzotriazole radical which comprises an acrylate or acrylamide functional group, which is bonded directly to a silicon atom, and which has the formula (4): ##STR2##

Abstract: An adhesive composition is provided comprising:(a) a plurality of polymeric, elastomeric microspheres wherein the microspheres are the reaction product of reactants comprising polymerizable starting materials comprising at least one C.sub.4 -C.sub.14 alkyl (meth)acrylate monomer and optionally at least one comonomer and have a solvent soluble portion that is 30-98% of the microsphere.

Abstract: Rubber slivers which are encapsulated within a protective, decorative film of weather-resistant and color-fast resin are used as unconsolidated fall zone material around and under playground equipment. The resin is applied to rubber slivers in the form of an aqueous coating in which a modified acrylic copolymer is mixed with color pigment and rheological additives. The aqueous coating is sprayed onto the rubber slivers as they fall by gravity flow through a drop zone. Thereafter, the aqueous coating is dried and set as the coated rubber particles are conveyed through the exposure zone of a hot air dryer.

Abstract: Multilayered film and film based assembly which are environmentally-compatible, and which exhibit one or more desirable characteristics of polyvinyl chloride (PVC) film and film based assemblies, such as clarity, flexibility and toughness, but without the environmental and health hazards associated with PVC materials, are provided. Also provided is a method of preparing such film and film based assembly.

Abstract: An electronic component has a body (11) that is formed from a mold compound that includes a thermoplastic material (31), a first filler (32) comprised of an electrically insulative material wherein the first filler (32) is more thermally conductive than the thermoplastic material (31), and a second filler (33) comprised of an electrically conductive material wherein the second filler (33) is more thermally conductive than the thermoplastic material (31).

Abstract: A stable, aqueous epoxy resin dispersion including: (A) an epoxy resin prepared by condensation of at least one epoxide compound having on average at least two epoxide groups per molecule, with an aralkylated polyhydroxy aromatic compound obtained by reaction of a polyhydroxy aromatic compound with an aromatic compound which carries an alkenyl group; (B) a dispersant; and water, is useful, for example, in a coating or adhesive.

Abstract: There is disclosed a heat resistant organopolysiloxane composition comprising:(A) 100 parts by weight of an organopolysiloxane having a viscosity of 100 to 1,000,000 centistokes at 25.degree. C.;(B) 0.001 to 10 parts by weight of a reaction product of an alkali metal silanolate compound with cerium chloride or a cerium carboxylate; and(C) a diorganopolysiloxane having silicon-bonded hydrogen groups only at its molecular chain terminals, component (C) being present in a quantity sufficient to provide 1 to 10,000 parts per million of silicon-bonded hydrogen based on the total weight of said composition.

Abstract: A room temperature-curable organopolysiloxane composition with excellent extrudability and self-extinguishing properties is made from a hydroxyl endblocked polydiorganosiloxane, aluminum hydroxide having an average particle size not exceeding 50 micrometers, colloidal calcium carbonate, platinum or a platinum compound, and a crosslinking silane or siloxane having at least three hydrolyzable groups.

Abstract: Aqueous low-solvent coating compositions comprising a modified epoxy resin dispersion comprising an epoxy resin which is prepared by condensation of one or more epoxide compounds having at least two epoxide groups per molecule with an aromatic polyol; a dispersant comprising a condensation product of an aliphatic polyol and an epoxide compound having at least two epoxide groups per molecule; a diluent consisting of ethylenically unsaturated otherwise inert or, if desired, functional monomers capable of free-radical polymerization or copolymerization, and water, and also an aqueous curing agent for the modified epoxy resin (I), which is suitable for curing at room temperature or at elevated temperatures (forced drying), components (I) and (II) being employed in proportions by mass such that the ratio of the number of epoxide groups which are capable of reaction to the number of amine hydrogen atoms is between 1:0.75 and 1:2. The coating compositions can be employed to produce matt coatings and in adhesives.