Abstract: Methods of treating lime bucking in a plaster slurry are described. The method involves providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, comprising: water; calcium sulfate hemihydrate; and hydrated lime; and mixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; and applying the plaster slurry containing the dispersant to a substrate. Veneer plaster dry component mixtures having reduced lime bucking when made into a slurry containing a low intensity dispersant, or hydrated lime coated with wax or a dibenzoate plasticizer are also described.

Abstract: The subject invention provides a method for producing essentially homogeneous asphalt compositions which are comprised of the asphalt, a block copolymer (such as a linear block copolymer or a radial block copolymer), and one or more additional desired additives. This method offers the advantage of being capable of attaining the essentially homogeneous asphalt composition in one pass procedure with a short residence time in the mixing equipment. This greatly reduces the thermal history to which heat sensitive asphalt additives, such as asphalt modification polymers, are exposed. It also simplifies the mixing procedure and can reduce the overall amount of energy required to attain the desired blend. In some case, it allows for the production on a commercial basis of asphalt compositions which would otherwise not be feasible, for instance the production of asphalt compositions which contain high levels of asphalt modifications polymers which are otherwise difficult to process.

Abstract: Disclosed is a method for the production of thermoplastic polymer dispersions, using a reaction vessel with a first volume and a secondary volume, wherein a first stirrer is located and operative in said first volume and a secondary stirrer is located and operative in said secondary volume, wherein the first volume is at least 20 times larger than the secondary volume, wherein the stirrers in both volumes are able to handle viscosities above of or equal to 1000 mpas, including the steps of a.) loading the first volume of the vessel with an initial amount of polymer and optionally water and optionally alkaline; b.) heating the vessel externally to a target process temperature in the range of 80-300° C.; c.) operating the first stirrer in the first volume for at least half an hour at a speed of in the range of 10-100 rpm; d.) addition of water and optionally alkaline to the first volume; e.

Abstract: This invention relates to the fields of polymer chemistry, materials science and ophthalmology. More particularly it relates to optical components and method(s) of preparing same from hydrophobic acrylic (HA) monomer(s) that exhibit reduced or eliminated glistenings when implanted in a patient's eye. The method of this invention uses a mixture of one or more low temperature initiators (LTI) combined with one or more high temperature initiators (HTI), to polymerize one or more HA monomers to produce an optical HA polymer which, when used to manufacture an optical component and implanted as with an intraocular lens (IOL), exhibit reduced glistenings to the patient.

Abstract: A process is provided for producing discrete solid beads of polymeric material e.g. phenolic resin having a mesoporous structure, which process may produce resin beads on an industrial scale without aggregates of resin building up speedily and interrupting production. The process comprises the steps of: (a) combining a stream of a polymerizable liquid precursor e.g. a novolac and hexamine as cross-linking agent dissolved in a first polar organic liquid e.g. ethylene glycol with a stream of a liquid suspension medium which is a second non-polar organic liquid with which the liquid precursor is substantially or completely immiscible e.g. transformer oil containing a drying oil; (b) mixing the combined stream to disperse the polymerizable liquid precursor as droplets in the suspension medium e.g.

Abstract: The invention concerns the use of a selected polycarboxylic type dispersant for aqueous calcium sulfate hemihydrate compositions that, simultaneously with its dispersing action, can control the initial setting and/or final setting times for these compositions. The invention also concerns aqueous calcium sulfate hemihydrate compositions comprising a polycarboxylic type dispersant or a mixture of polycarboxylic type dispersants.

Abstract: The invention relates to preparation of silica-rich rubber compositions by a sequence of sequential mixing steps conducted in internal rubber mixer(s) with individual maximum temperature limitations. The mixing steps are comprised of at least two non-productive mixing steps followed by a productive mixing step. The non-productive mixing steps themselves are comprised of at least one preliminary non-productive mixing step followed by a final non-productive mixing step. Elastomer, silica and coupling agent are added in at least one of said preliminary non-productive mixing steps to the exclusion of said final non-productive mixing step and said productive mixing step. Sulfur and sulfur vulcanization accelerator(s) are added in said productive mixing step to the exclusion of said non-productive mixing steps. The preliminary non-productive mixing step(s) are individually conducted to a maximum mixing temperature in a range of from about 150° C.

Abstract: Disclosed is a method for producing a flame retardant polycarbonate resin composition by using a screw extruder, which comprises extruding a resin component (mainly comprising a polycarbonate) and an organic phosphorus compound having an acid value of not more than 0.1 mg KOH/g while kneading, wherein the temperature of the resin component in the extruder is not higher than 300° C., and the residence time of the resin component in the extruder is not more than 40 seconds.

Abstract: A method for making a silicic acid containing rubber base composition includes providing composition ingredients of rubber, silicic acid, silane and additional additives except for vulcanization ingredients. First and second mixers separate from each other are provided wherein the ingredients except for the vulcanization ingredients can be mixed. All of the composition ingredients are introduced into the first mixer except for the vulcanization ingredients simultaneously or at time intervals. The composition ingredients introduced into the first mixer are mixed to a composition. The composition formed in the first mixer is transferred directly into the second mixer without an intermediate storage thereof. The transferred composition formed in the first mixer is mixed at least almost to completion in the second mixer with the temperature lying in the temperature range of 130° C. to 180° C.

Abstract: Process for the preparation of alkylated N- or amino, ammonium or spirobicyclic ammonium group-containing, crosslinked polymer gels, which is characterized in that

Abstract: The object of the present invention is to provide a method of reclaiming crosslinked rubber, which can reclaim various kinds of crosslinked rubbers whose reclamation is difficult. The method of reclaiming crosslinked rubber 10 of the present invention includes a step of reclaiming crosslinked rubber by applying shear stress to the crosslinked rubber 10, wherein the maximum pressure in the reclaiming step is 1.5 MPa or more.

Abstract: The present invention relates to a process for preparing a filled polymer composite comprising from 1 to 98 percent by weight of an interpolymer and from 2 to 99 percent by weight of a filler, said process comprising copolymerization in the presence of a cyclopentadienyl-containing transition metal catalyst and a filler, said filler having immobilized thereon a suitable cocatalyst.

Abstract: A method of compounding a multimodal, preferably a bimodal polymer composition comprising a low molecular weight ethylene polymer and a high molecular weight ethylene polymer is described. The composition is compounded during a relatively long time at a low temperature which lies in a narrow temperature range including the melting point of the low molecular weight ethylene polymer. More particularly, the polymer composition is compounded, without addition of a beat transfer medium, in a temperature range from about 10.degree. C. below to about 10.degree. C. above the melting point of the low molecular weight ethylene polymer during a time of more than 10 seconds. The viscosity ratio between the ethylene polymers in said temperature range preferably is from about 5:1 to about 1:5.

Abstract: A method of making polymer-coated pigment particles, involving the steps of providing a plurality of pigment particles, each of which has an outer surface coated with a layer of material that operates as a nucleus for initiating polymerization on the outer surface of each of the pigment particles. The pigment particles are mixed with a reaction mixture containing a solvent and a monomer material, wherein the layer of material coating each of the pigment particles causes the monomer material to polymerize on the outer surface of substantially each of the pigment particles to form a polymer coating thereon.

Abstract: A process for making hot melt adhesive compositions comprising the steps of:(a) dissolving hot melt adhesive components into a room temperature or higher solution of a water soluble substituted (e.g. NMP) to form a water soluble substituted lactam (e.g. NMP)/hot melt adhesive component solution;(b) adding said solution formed in step (a) into water to form a solid;(c) extracting out the water soluble substituted lactam (e.g. NMP) from said solid formed in step (b);(d) drying of said solid wherein water soluble substituted lactam e.g. NMP, is leached out as in step (c) to form the hot melt adhesive.

Abstract: The method for manufacturing rubber mixtures includes the steps of plasticizing batchwise rubber in a first inner kneader to produce a batch of plasticized rubber and transporting the batch of plasticized rubber, while still hot, into a second inner kneader. In the second kneader nonreactive additives are mixed into the batch of plasticized rubber.

Abstract: Method for preparing adhesive compositions subjecting a mixture of block polymer and other adhesive constituents e.g., resin(s) and oil(s) to shearing and smearing in an emulsifier disperser.

Abstract: The present invention relates to a process to simultaneously reactor-fill polyolefins and to a compatibilized, reactor-filled polyolefin composite produced by the process of the instant invention. More specifically, the instant invention provides a process to simultaneously reactor-fill-polyolefins comprising the steps of (a) treating a filler with a catalytic amount of an organometallic compound prior to using the filler for in-situ polymerization; (b) contacting the product of step (a) in random order of no specific sequence with a high activity polymerization catalyst, a cocatalyst, and, if necessary a cocatalyst modifier such that said contacting results in the formation of an interpenetrating, compatibilizing polymer in the pores and surface of the filler when exposed to a monomer; and (c) adding an alpha-olefin under olefin polymerization reaction conditions to the reaction product of step (b) to form a reactor-filled composite.

Abstract: The present invention relates to a method to reactor-fill polyolefins and to reactor-filled composites obtained from the instant method. More specifically, the present invention relates to a method to reactor-fill polyolefins comprising the steps of (a) adding a catalytic amount of a low activity catalyst to a filler material either during or before polymerization to initiate the formation of atactic polyolefin on the surface and in the pores of the filler; (b) contacting the product of step (a) in no specific order with a high activity catalyst, a cocatalyst, and, if necessary a cocatalyst modifier; and (c) adding an alpha-olefin under olefin polymerization reaction conditions to the reaction product of step (b) to form a reactor-filled composite.

Abstract: Method for preparing adhesive compositions by dissolution of the block polymer component(s) thereof in a hot melt of the other adhesive constituents e.g., resin(s) and oil(s).

Abstract: Continuous agglomeration of an absorbent resin powder is accomplished by a method which comprises introducing the absorbent resin powder into a cylindrical member having an open lower end by means of a current of air through a dispersing member disposed in the upper part of the cylindrical member and, at the same time, spraying minute droplets of an aqueous liquid downwardly through a nozzle disposed inside the dispersing member thereby establishing mutual parallel flow contact between the absorbent resin powder descending toward the lower part of the cylindrical member as dispersed with the current of air and the liquid droplets descending toward the lower part of the cylindrical member as diffused in the radial direction, and removing the produced agglomerate having a plurality of particles of the absorbent resin powder cohesively united through the medium of the liquid droplets via the lower part of the cylindrical member. An apparatus for working the method is also disclosed.

Abstract: A stable aqueous dispersion and process for making the dispersion are provided containing hydrolyzed cellulose ester, organic solvent, water and acrylic resin having free acid functionalities that are at least partially neutralized. The dispersion is useful in coatings and can also contain surfactant and cross-linking agent.

Abstract: Polyester compositions exhibiting decreased distortion (warpage), improved processability and productivity are produced by melt-blending a thermoplastic polyester resin with between 3 to 65% by weight of a fibrous reinforcement medium, and between 3 to 65% by weight of binder-agglomerated glass granules.

Abstract: A method of producing a mixture that contains rubber or rubber-like material, and carbon black. The method includes the steps of adding to the rubber or rubber-like material a portion only of the intended total quantity of carbon black, thereupon preheating the above in a high-frequency alternating field, and subsequently adding in the remainder of the intended total quantity of carbon black. Expediently, approximately up to a maximum of one-third of the intended total quantity of carbon black is added to the rubber prior to the preheating step.

Abstract: New resins based on oxidized polyethylene, which are thermoplastic or thermosetting, soluble in solvents and/or aqueous media, are characterized in that they consist essentially of grafted polyethylene obtained by preparing a dispersion of a molten oxidized polyethylene in an organic solvent medium at a temperature above the softening range of the oxidized polyethylene. The oxidized polyethylene is employed in a proportion of 0.5 to 30% by weight of the resin and has a weight average molecular weight of between 900 and 25,000 and also contains side groups ending in functional groups capable of giving rise to free radicals. The dispersion is polymerized with a mixture of catalyzed monomers consisting essentially of acrylic and/or methacrylic monomers, in a proportion of 70 to 99.5% by weight based on the resin, the mixture being added gradually during the reaction.The resins according to the invention can be employed as a binder for coatings in paints, varnishes, glues, inks, adhesives and sealants.

Abstract: A process is provided for preparing a vulcanized carbon black-reinforced chloro- or bromobutyl rubber film comprising admixing a polyfunctional amine vulcanization system with a carbon black-reinforced chloro- or bromobutyl rubber latex containing one or more selected emulsifiers, forming a film from the resulting mixture, drying said film and heating the dried film to provide the vulcanized film. The process may be used in the manufacture of coatings, dipped goods and chemical resistant impermeable treated fabrics.

Abstract: A process is provided for the production of soft compounds which are curable by heat to rubbery elastomers which process comprises mixing in a trough type blade mixer a butadiene-acrylonitrile polymer, filler, tackifying resin, plasticizer, a polymerizable monomer and an organic peroxidic compound. The soft compounds may be used as gunnable or spreadable compounds or for gasketing or jointing purposes and cured in situ.

Abstract: An improvement in the diazotization of polymeric amines is disclosed that minimizes crosslinking problems. Solutions of nitrite ion and polymeric amine are concurrently continuously fed at controlled rates to a turbulently agitated limited volume mixing zone.

Abstract: Aqueous polymer dispersions containing up to 75% by weight of polymer are prepared advantageously by emulsion copolymerization in the presence of conventional anionic emulsifiers, polymerization initiators and small amounts of polymerization inhibitors, at conventional polymerization temperatures, by copolymerizing at least two monomers A, which per se are not copolymerizable with one another, mixed with from 60 to 95% by weight of at least one monomer B, which is copolymerizable with both monomers A, in the presence of a polymerization inhibitor, by the emulsion feed process, wherein (a) the initial aqueous phase at the start of the monomer emulsion feed contains from 0.01 to 0.

Abstract: A process, and the product of the process, is provided for the production of improved rubbery vulcanizates which contain both of silica or calcium silicate and carbon black as the fillers and two polymers one of which contains hydroxy or epoxy groups. Such vulcanizates may be used in tires, general purpose goods such as belting, and the like.

Abstract: A method of rapidly compounding melt forming resin, mica and chlorinated hydrocarbon wherein the mica has a coating comprising the chlorinated hydrocarbon, which method comprises providing a molten mass of the resin, contacting the molten mass with the coated mica and kneading the so contacted mica and resin to provide mixing thereof. The compounding is rapid and at optimal temperature.

Abstract: This invention relates to a vinyl acetate-ethylene copolymer containing emulsion particularly adapted for the preparation of nonwoven goods. The vinyl acetate-ethylene emulsion is prepared by an improved process for producing an aqueous emulsion suitably adapted for producing non-woven goods said emulsion containing a vinyl acetate-ethylene copolymer wherein said copolymer contains from about 75-96% by weight of vinyl acetate. It is produced by forming an aqueous suspension of vinyl acetate, ethylene, and stabilizer, initiating the polymerization of the reaction mixture by the addition of catalysts, and adding from about 0.5-10% by weight of the vinyl acetate of a crosslinkable monomer. The improvement for enhancing the absorptivity of the copolymer comprises:pressurizing the reactor with ethylene to an initial ethylene equilibrium pressure of from about 100 to 1,000 psig;initiating the reaction mixture by the addition of catalyst at a temperature from about 10.degree.-35.degree. C.