Abstract: An improved cast process and apparatus for fusing closure elements, particularly those with thickened bases, to separately extruded film or sheet stock for making containers with integral reclosable closures. The process is applicable to webs of film which contain more than one pair of closure elements. The web is split immediately adjacent the die exit between adjacent pairs of closure elements to achieve a film having essentially erect closure elements and associated ribs should they be included. The process also permits beaded edges along both sides of the film. Improved containers can thus be produced.

Abstract: An article comprising a magnetic shielding thermoplastic polymeric material containing a powdery ferrite and a heat shrinkable thermoplastic polymeric material layer. Due to its specific structure, this article is excellent in applicability over any electrical component, and may provide over the component a cover having excellent magnetic shielding and mechanical strength properties. It may also bring about a substantial increase in inductance of the component.

Abstract: The present invention relates to the production of 1,4-cis-polybutadiene and of copolymers of butadiene with other conjugated diolefins, by means of the catalytic polymerization or copolymerization of monomer butadiene, by an either continuous or batch process, operating in the presence or in the absence of diluents, and carrying out a portionwise addition, during the polymerization, of a portion of the organometallic compound of aluminum (or of the related hydride derivative), constituiting also one of catalytic components.

Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.

Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.

Abstract: Highly uniform polymeric microbeads of a predetermined size, preferably having an attached fluorescent label on the surface, are prepared by causing seed particles to swell by absorption of a plurality of low molecular weight substances, at least one of which is a monomer having a reactive functional group. After absorption, the monomer is internally polymerized, and the reactive functional group is preferably reacted with a polyfunctional spacing agent thereby to provide a second reactive functional group. The latter is then reacted with a fluorescent label to provide the labeled microbead.

Abstract: Compositions of salts of water-soluble, carboxyl-containing polymers and surface active agents, deposited on polymerization reactor surfaces exposed to polymerization mixtures, substantially reduce or eliminate undesirable polymer build-up on reactor surfaces during aqueous polymerization of vinylidene monomers, even when the amount of carboxyl-containing polymers deposited on the reactor surfaces is very small.

Abstract: The residual monomers, solvents and other impurities particularly in coarse or oversized fat imbibing, fat retaining copolymer beads can be substantially reduced by bringing the copolymer beads into contact with a gas in the supercritical state.

Abstract: The present invention provides for a process for transforming a substantially continuous web of substantially planar, deformable material having an indefinite length, a first surface, and a second surface into a formed material. The material has a transformation temperature range. The process comprises the following steps:(a) The web of material is provided on a forming structure with the first surface of the web of material proximate a forming surface of the forming structure. The forming surface moves in a direction of the length of the web of material and carries the web of material in that direction.(b) A liquid stream is applied to the second surface of the web of material. The liquid stream has sufficient force and mass flux to cause the web of material to be deformed toward the forming surface, such that the material acquires a substantial three-dimensional conformation.

Abstract: In a process for producing an olefin polymer which comprises continuously polymerizing an olefin in the presence of a catalyst composed of a transition metal compound component and an organometallic compound component in at least two independent polymerization zones connected in series by a pipeline while feeding the olefin and the catalyst into an upstream zone of polymerization and withdrawing the resulting polymer from a downstream zone of polymerization; the improvement wherein(1) the polymerization in the upstream polymerization zone is carried out in a liquid medium under conditions for slurry polymerization,(2) the solid polymer-containing slurry discharged from the upstream polymerization zone is fed into a liquid medium exchanging zone through an upper feed opening (A) in its upper portion, said liquid medium exchanging zone being provided between the upstream polymerization zone and the downstream polymerization zone and connected to these zones by pipelines, and an additional supply of the liquid m

Abstract: The invention relates to a method and to a reactor for the single-step polymerization of vinyl monomers by a heterogeneous polymerization in bulk by means of organometalic catalysts. A method according to the invention consists in charging a vertical reactor, which is provided with at least two planetary stirrers situated outside the reactor axis, each stirrer formed from a planar centrally-symmetrical two-blade paddle, with a vinyl monomer, the subsequent introduction of an organometalic catalyst in a solution under stirring and in partial doses amounting to 10.sup.-5 to 10.sup.-3 mole up to the final amount of 5.times.10.sup.-4 to 5.times.10.sup.-2 mole of catalyst per mole of monomer, stirring of the batch, cutting and disintegration of the formed compact mass with the planetary stirrers and its parallel wiping from the surface of reactor with wiping blades until the batch acquires a powdery form and the resulting product is discharged.

Abstract: A halogenated ethylene-vinyl acetate-isobutene terpolymer is provided that has improved thermal stability.

Abstract: Device and process for introducing a powder with catalytic activity into a fluidized bed polymerization reactor (1), the said device comprising:a storage enclosure (2) for powder with catalytic activity, provided with a feed line (3) for powder with catalytic activity and a shut-off valve (26), this enclosure being connected to a metering device (4) making it possible to deliver periodically a given volume of powder with catalytic activity,an intermediate chamber (5), placed below the metering device to receive direct the powder delivered by the latter, this intermediate chamber comprising in its upper part a tube (6) bringing in a inert carrier gas, provided with a shut-off valve,piping for conveying the powder (8) connecting the bottom part of the intermediate chamber to the fluidized-bed reactor, this piping having a portion which is more or less horizontal, the said powder conveying piping being provided with a full-bore rapid-opening valve (10).

Abstract: What is disclosed are organopolysiloxane release coatings which are curable on a substrate and which consist of a base siloxane copolymer containing CH.sub.3 SiO.sub.3/2 units; C.sub.6 H.sub.5 SiO.sub.3/2 units, C.sub.6 H.sub.5 (CH.sub.3)SiO units and (C.sub.6 H.sub.5).sub.2 SiO units; CH.sub.3 SiO.sub.3/2 ; a fluid polysiloxane, and a curing agent. They are especially useful on commercial and household cookware and bakeware.

Abstract: Aqueous chemical washes suitable for use in conjunction with well cementing operations are disclosed which comprise water, an anionic or a non-ionic surfactant (or a combination thereof) and a fluid loss control agent of the type described in U.S. Pat. No. 3,891,566.

Abstract: A process for extracting resin and rubber from guayule plants utilizing a portion of recycled miscella and a fresh solvent system. An expression step is applied to the plants to enhance recovery of resin and rubber extract. The solvent system is preferably an organic polar solvent and a hydrocarbon solvent for rubber for simultaneous resin and rubber extraction containing at least 50% by weight of the hydrocarbon solvent. The process can be a one-step method wherein resin and rubber are generally simultaneously extracted.

Abstract: Many synthetic latices are produced with a small particle size. It is desirable to increase the particle size and concentrate the latex. It is known to use agglomerating agents to increase particle size. The temperature of agglomeration may be reduced if the latex is destabilized with a weak acid, preferably carbonic acid. This results in an energy saving for the process.

Abstract: A fluorine-containing polymer film is prepared by flow-casting a fluorine-containing vinyl monomer, which is liquid under polymerization conditions, in the form of a film having a thickness of up to 1 mm and polymerizing the flow-cast monomer.

Abstract: Process for inhibiting crust formation in reactors used for polymerising alpha-olefines, such as ethylene and propylene, in the presence of particles of catalytic solids containing titanium and chlorine in the combined state.The polymerisation is carried out in the presence of an amount of a silicone oil which is less than 1% by weight, relative to the weight of catalytic solid.

Abstract: A method for isolating polymer resins from organic solvents is provided wherein the organic solvent is vaporized in a separation medium comprised of water and an organic anti-solvent for said polymer without significant vaporization of the organic anti-solvent. The polymer precipitates as a powder without high-speed, high-shear agitation and without the formation of a sticky globular mass.