Abstract: A process and system for prevention of fouling of pressure taps in a first gas phase fluidized bed polymerization reactor while avoiding sheeting during production of polyolefins in a second downstream gas phase fluidized bed polymerization reactor wherein a relatively small amount of water is added directly to the pressure taps of the first reactor.

Abstract: A two-phase thermoplastic composition adapted for forming thermoplastic patterns. The composition comprises an organic thermoplastic pattern material and at least about 5% by weight of discrete particles of cross-linked poly(methylmethacrylate) that are physically stable at temperatures above 130.degree. F. Also disclosed are investment casting patterns of such composition and processes utilizing such composition.

Abstract: A polyvinylbutyral-based thermoplastic composition which is useful for forming thermoadhesive films for adhering bases onto a glazing. The composition comprises a polyvinylbutyral resin with a hydroxyl group content of between 22 and 26% by weight, a plasticizer for the resin and an orthosubstituted phenolic antioxidizing agent. This composition is useful for forming a thermoadhesive film having good adhesion at the surface of the glass and good stability at high temperatures.

Abstract: Ethylene-vinyl acetate copolymer compositions useful as adhesives, vibration-damping compositions or coating compositions which comprises a saponification product or a grafted saponification product of an ethylene-vinyl acetate copolymer and at least one aliphatic or aromatic polycarboxylic acid or anhydrides thereof.

Abstract: An emulsion adhesive composition is provided which comprises: (i) an aqueous elmusion of a adhesive synthetic resin and (ii) a solution of an organic solvent and a polyolefin and/or a hydrogenated block copolymer composed of an aromatic vinyl compound and an aliphatic diene polymer blocks, and each of the polyolefin and the hydrogenated block copolymer contains at least one functional group selected from carboxylic anhydride carboxyl, glycidyl, hydroxyl, amido and alkoxysilyl groups. A photostabilizer may be incorporated into the composition in which said component (ii) may contain chloro.The emulsion adhesive composition can be used for adhering a highly crystalline resin molded article to an optional material without a complicated surface treatment, and can have a light resistance and storing stability.

Abstract: The setting properties of an .alpha.-cyanoacrylate adhesive composition are ccelerated by adding thereto a hydroxyl group derivative of an .alpha.-, .beta.- or .gamma.-cyclodextrin which is at least partly soluble in the .alpha.-cyanoacrylate.

Abstract: Disclosed herein is a new process for producing polyvinyl ester having a high degree of polymerization having an intrinsic viscosity not less than 1.5 dl/g, preferably not less than 2.2 dl/g, and most preferably higher than 3.2 dl/g, said process comprising subjecting vinyl ester monomer to low-temperature emulsion polymerization under specific conditions.Disclosed also herein is a new process for producing polyvinyl alcohol having a high degree of polymerization having an intrinsic viscosity not less than 1.5 dl/g, preferably not less than 2.2 dl/g, and most preferably higher than 3.2 dl/g, said process comprising saponifying in the usual way the polyvinyl ester obtained by low-temperature emulsion polymerization under specific conditions.

Abstract: This invention relates to production of a super long conjugated polymer to be used for a molecular device, etc. According to this invention, an acetylene derivative is previously oriented and formed into a monomolecular film on the surface of a substrate and its acetylenic group is polymerized by a catalyst or by irradiation of an energy beam while keeping the orientation. Since the respective molecules are oriented and aligned on the substrate surface, the polymerization reaction readily proceeds, and after the polymerization the resulting polyacetylene molecules are prevented from the breakage of conjugated bonds caused by thermal agitation or twisting of the polyacetylene molecules. Accordingly, a polyacetylene or polyacene type polymer having long conjugated bonds can be obtained easily.

Abstract: This invention relates to production of a super long conjugated polymer to be used for a molecular device, etc. According to this invention, an acetylene derivative is previously oriented and formed into a monomolecular film on the surface of a substrate and its acetylenic group is polymerized by a catalyst or by irradiation of an energy beam while keeping the orientation. Since the respective molecules are oriented and aligned on the substrate surface, the polymerization reaction readily proceeds, and after the polymerization the resulting polyacetylene molecules are prevented from the breakage of conjugated bonds caused by thermal agitation or twisting of the polyacetylene molecules. Accordingly, a polyacetylene or polyacene type polymer having long conjugated bonds can be obtained easily.

Abstract: This invention relates to production of a super long conjugated polymer to be used for a molecular device, etc. According to this invention, an acetylene derivative is previously oriented and formed into a monomolecular film on the surface of a substrate and its acetylenic group is polymerized by a catalyst or by irradiation of an energy beam while keeping the orientation. Since the respective molecules are oriented and aligned on the substrate surface, the polymerization reaction readily proceeds, and after the polymerization the resulting polyacetylene molecules are prevented from the breakage of conjugated bonds caused by thermal agitation or twisting of the polyacetylene molecules. Accordingly, a polyacetylene or polyacene type polymer having long conjugated bonds can be obtained easily.

Abstract: The invention relates to aqueous contact adhesive dispersions containing, based on the total weight of the dispersion, from 40 to 70% by weight of a copolymer prepared by emulsion polymerization, where the copolymer containsa) from 40 to 70% by weight of vinyl esters of aliphatic carboxylic acids having 2 to 12 carbon atoms,b) from 10 to 40% by weight of acrylic acid esters of aliphatic alcohols having 4 to 12 carbon atoms,c) from 8 to 15% by weight of methacrylic acid esters of aliphatic alcohols having 4 to 12 carbon atoms,d) from 0.1 to 3% by weight of ethylenically unsaturated compounds which cause cross-linking,e) from 0.1 to 5% by weight of ethylenically unsaturated carboxylic acids,f) from 0.1 to 2% by weight of substituted and unsubstituted (meth)acrylamides,g) from 0.5 to 3% by weight of ethylenically unsaturated hydroxyalkyl-functional compounds, andh) from 0.5 to 3% by weight of ethylenically unsaturated sulfates and/or sulfonates.

Abstract: A composite particle dispersion is prepared by mixing an aqueous dispersion of polymer particles which will form the particle shell with pre-formed polymer particles which will form the core at a temperature above the glass transition temperature for the shell particles. In order to ensure composite particle formation, certain interfacial energy criteria have to be satisfied for the core particle surface/shell particle surface/liquid interfaces. In order to allow the desired energy relationships to be established, the core particle surfaces include covalently attached ionic groupings which enable a permanent modification of the core particle surface to be made.

Abstract: The invention provides a process for the preparation of large-particle, aqueous plastic dispersions, which permits targeted adjustment of particle size. The process comprises a system which controls the particle size and comprises the step of polymerizing a monomer in the presence of an anionic emulsifier; a substantially non-branched, nonionic, water-soluble polymer auxiliary; and alkali metal and/or ammonium ions not bonded to emulsifier. The polymer auxiliary can be prepared reproducibly with regard to its agglomerating effect.

Abstract: A pressure sensitive adhesive of a mutually immiscible first elastomer (styrene-butadiene block copolymer) exhibiting a first glass transition temperature and a second elastomer (e.g., a styrene-isoprene-styrene block copolymer) exhibiting a second glass transition temperature greater than the first is tackified by a tackifying system comprising tackifier preferentially miscible with the second elastomer to provide a dynamic mechanical spectrum plot of tangent delta versus temperature in .degree.C. showing two separate and distinct glass transition temperature peaks. The mixture exhibits excellent processability and ambient and low temperature adhesive properties.

Abstract: A cyanoacrylate monomer adhesive formulation which has improved thermal properties resulting from the inclusion in the formulation of an effective amount for enhancing the thermal resistance of the cured polymer of a mono, poly or hetero aromatic compound characterized by at least three substitutions on an aromatic ring thereof, two or more of said substitutions being electron withdrawing groups selected from the group consisting of NO.sub.2, CN, CF.sub.3, NR.sup.1.sub.3.sup.+, SR.sup.1.sub.2.sup.+, C(.dbd.O)R.sup.1, C(.dbd.O)OR.sup.1, NO, CCl.sub.3, SO.sub.2, S(.dbd.O), SO.sub.3, SO.sub.2 R.sup.1, SO.sub.2 OR.sup.1 and F, one or more of said substitutions being leaving groups selected from the group consisting of F, Br, Cl, I, NO.sub.2, CN, SOR.sup.1, SO.sub.2 R.sup.1 and SO.sub.2 OR.sup.1, and R.sup.1 is an optionally substituted hydrocarbon group. Example such compounds have the formula: ##STR1## where L is the leaving group and the W groups are the electron withdrawing groups.

Abstract: Novel chromium-containing compounds, such as, for example, chromium pyrrolides, are prepared by forming a mixture of a chromium salt, a metal amide, and an electron pair donor solvent, such as, for example, an ether. These novel chromium-containing, or chromium pyrrolide, compounds can be used either unsupported or supported on an inorganic oxide support to trimerize and/or polymerize olefins.

Abstract: Disclosed herein is a pressure sensitive adhesive composition comprising 100 parts by weight of at least one block copolymer selected from the group consisting of block copolymers represented by the general formula A-B-A and block copolymers represented by the general formula A-B, wherein A means a styrene polymer block and B denotes a butadiene polymer block, an isoprene polymer block or a polymer block obtained by hydrogenating these polymers, 100-200 parts by weight of a tackifying resin and 25-200 parts by weight of a polyolefin. Pressure sensitive adhesive tapes or sheets comprising, as a pressure sensitive adhesive layer, the pressure sensitive adhesive composition are also disclosed.

Abstract: High molecular weight polymer that can form a viscous aqueous solution is chemically modified by mixing the previously formed polymer (as a powder, reverse phase dispersion or oil-in-water emulsion) with water and the reagent for effecting the chemical modification so as to form a viscous aqueous mixture having a viscosity of at least 1OOO cps (Brookfield RVT) and then feeding this mixture as intermittent batches into one end of a tower through which it moves with substantially plug flow and from which it is withdrawn, at the end of the reaction, as intermittent batches. The apparatus for this purpose is also novel.

Abstract: An aqueous adhesive composition containing a chlorosulfonated polyethylene latex, a polymaleimide compound, a nitroso compound and a metal oxide. The adhesive composition can be effectively utilized without a primer component and exhibits an unusually high resistance to pre-bake conditions and adverse environments. The adhesive also possesses the ability to effectively bond a variety of substrates.

Abstract: Adhesive component formulations containing (meth)acrylic acid esters, containing formamide groups, and optionally an initiator, which are used as an adhesive component for the treatment of collagen-containing materials.