Abstract: A graft copolymer which is suitable for use as coating material and thermoplastically processible resin consisting essentially of(A) from 10 to 80%, by weight, of an ethylene/vinyl ester copolymer having a vinyl ester content of from 1 to 75%, by weight; and, grafted thereon,(B) from 90 to 20%, by weight, of a monomer mixture comprising:(I) from 5 to 50%, by weight, of acrylonitrile and/or methacrylonitrile;(II) from 94.9 to 35%, by weight, of an aromatic monovinyl compound;And(III) from 0.1 to 15%, by weight, of an optionally N-substituted acrylamide and/or methacrylamide;The sum of (A) and (B) and I-III being 100%, by weight.

Abstract: A process for the high pressure polymerization of ethylene at elevated temperatures in a polymerization zone followed by transfer of the reaction mixture, through a cooling zone, into the separation zone. In this process, the pressure at the cooling zone outlet is periodically reduced briefly, at recurring intervals, these brief pressure reductions being independent of the pressure reductions in the polymerization zone. Using this process, the conversion in the polymerization unit can be increased and a more homogeneous ethylene polymer can be obtained.

Abstract: Isobutene polymers having a mean degree of polymerization P of from 10 to 100 and a proportion E of double bonds, capable of reaction with maleic anhydride, of from 60 to 90%, where E=100% corresponds to the calculated theoretical value for the case where each molecule of the isobutene polymer contains such a reactive double bond.

Abstract: A method is provided for treating a hydrogel with a saturated, aliphatic alcohol selected from the group consisting of 1-pentanol, 2-pentanol, 3-methyl-1-butanol, 4-methyl-2-pentanol, 2,2-dimethyl-1-propanol and 1-hexanol to remove water thereby producing a dried product that retains a porous structure and is particularly suitable upon impregnation with a polymerization catalyst for use in promoting the production of ethylene polymers of melt index in excess of about 6.6.

Abstract: A catalyst for the preparation of ethylene polymers having higher melt indexes comprises a silyl chromate deposited on a silica support containing both aluminum and titanium.

Abstract: A graft polymer of polyvinylidene fluoride wherein the polyvinylidene fluoride has grafted thereon a polymer of an ethylenically unsaturated compound and a process for preparing such graft polymer by contacting polyvinylidene fluoride with a monomer of an ethylenically unsaturated compound in the presence of a radical forming catalyst while the polyvinylidene fluoride is maintained in the solid phase under conditions for polymerization of the ethylenically unsaturated compound.

Abstract: Catalysts, especially for olefin polymerization are prepared by coating an aluminum compound on a selected high pore volume silica gel, and calcining the support at temperatures of from about 200.degree. to 2000.degree. F. The preferred catalyst is prepared with an inorganic support material as aforesaid, thereafter depositing an organophosphoryl chromium compound thereon, and activating the thus-treated support by heating in a non-reducing, preferably oxygen-containing, atmosphere at temperatures of from about 800.degree. to 2000.degree. F. The activated, supported catalyst composition may, but need not necessarily, be combined with a metallic and/or non-metallic reducing agent, to provide a catalyst system useful in the polymerization of 1-olefins.

Abstract: Polymeric materials are disclosed in which a synthetic essentially hydrophobic base polymer has at least in its surface region a crosslinked polar comonomer graft in the surface region at least of which there are metal atoms or ions which are chemically bound and which cannot be removed by solution processes. There are also disclosed three processes by which such materials may be produced. The deposition of a complex metal compound, the contacting of the graft with a metal compound both followed by heating, and graft copolymerization with a metal containing comonomer. There is also disclosed a method of ensuring a good bond between a polymeric material and a coating which includes a preliminary surface graft with a polar comonomer.

Abstract: A process for purifying a crude isoprene containing polymerization inhibiting materials such as acetylenes and sulfur compounds to produce high purity or polymerization grade isoprene comprising distilling the crude isoprene in the presence of at least one member selected from saturated hydrocarbons containing 6 to 8 carbon atoms, withdrawing the polymerization inhibiting materials as an overhead fraction and obtaining purified isoprene as a bottom fraction.

Abstract: A graft modified polyethylene process is described which comprises contacting polyethylene with an organic peroxide in the presence of an ethylenically unsaturated polycarboxylic acid or derivative thereof at a temperature of from 140.degree.-210.degree. C. The resulting graft modified polyethylene in combination with polyamides provide polymer blends having improved impact properties.

Abstract: The invention is directed to new catalysts consisting of a chromium compound and an organometal compound of an element of Group II or III of the periodic system on a carrier, the process for preparing the catalyst and its use in polymerizing 1-alkenes containing 2 to 8 carbon atoms, optionally admixed with at most 10 mole% of at least one other 1-alkene of 2 to 8 carbon atoms.

Abstract: A process for producing a cyclopentadiene resin by heat copolymerizing a cyclopentadiene monomer and a comonomer copolymerizable therewith, which comprises(a) using a vinyl monomer containing an ester linkage or a hydroxyl group as the comonomer, and(2) feeding the polymerizable ingredients and optionally an inert solvent from a material-preparing zone to a polymerization zone to polymerize the polymerizable ingredients, feeding the polymer solution formed in the polymerization zone into a separating zone to separate a low-boiling mixture consisting of the unreacted monomers, a by-product oil and optionally the inert solvent from the resulting cyclopentadiene resin, and recycling at least a part of the separated low-boiling mixture to the material-preparing zone for use as a polymerizable ingredient.

Abstract: Improved continuous process for synthesis of cis-1,4 poly(isoprene). In the commercial process for synthesis of cis-1,4 poly(isoprene) only a portion of the monomer charged is polymerized. The polymer, thus obtained, is separated from the unreacted monomer which in turn is recycled with solvent back into the system for conversion to additional polymer. Fresh monomer must be added from a separate feed to this recycle stream in sufficient quantity to replace or "make-up" for that which was converted to polymer. In the improved process of this invention, this "make-up" isoprene monomer is dried and then is introduced into the process subsequent to the initiation of polymerization of the isoprene monomer already present within the system, but prior to deactivation of the polymerization catalyst. Dehydration of "make-up" isoprene prior to its introduction into the process stream at the above juncture avoids deactivation of the still active catalyst with water.

Abstract: Modified polyolefin having high adhesion strength and less irritating odor during processing is obtained by reacting unsaturated carboxylic acid or its anhydride grafted polyolefin with a bifunctional compound having alcohol groups or amine groups. Preferable unsaturated carboxylic acids are maleic acid, and endobicyclo-[2,2,1]-5-heptene-2,3-dicarboxylic acid. Preferable bifunctional compounds are ethylene glycol, 1,4-butanediol, 1,6-hexanediol, glycerine, ethylene diamine, 1,3-diaminopropane m-phenylene diamine, etc.

Abstract: A process for the production of modified polyolefins by combining a polyolefin with one or more carboxylic acids or their anhydrides in the presence of a radical producing agent in an extruder and in the presence of an organosilane. If desired glass fibers can also be incorporated at the same time.

Abstract: A catalyst and the method of making same and a method of making polymers of 1-olefins with said catalyst in which the catalyst is prepared by chemically modifying a finely divided, difficultly reducible, inorganic support of the nature of silica, alumina, thoria, titania, magnesia and mixtures thereof by adding to the support a zirconium compound before dispersing on the modified support a chromium chelate derived from a beta-dicarbonyl compound that may be either acyclic or cyclic, the chelate being essentially of the formula ##STR1## WHEREIN R is individually selected from hydrogen, alkyl, alkenyl, aryl, cycloalkyl and cycloalkenyl radicals and combinations of these radicals with each R containing 0-20 carbon atoms and a corresponding valence-satisfying number of hydrogen atoms, R' is selected from alkylene, alkenylene, arylene, cycloalkylene and cycloalkenylene radicals and combinations of these bivalent radicals with R' containing 1-20 carbon atoms and a corresponding valence-satisfying number of hydrogen

Abstract: In a process for producing substantially gel free elastomers of isobutylene and a conjugated diene selected from the group consisting of cyclopentadiene, methylcyclopentadiene, isoprene or piperylene and mixtures thereof, improved products, higher catalyst efficiency, high cement concentrations and improved monomer conversions are obtained by the use of staged, or multiple reactors whereby the monomers and/or catalyst feeds may be divided among the reaction zones. The process provides elastomers which are substantially gel free having controlled molecular weight distribution (polydispersity) and high molecular weights at about 8 to about 45 mole % unsaturation.

Abstract: Novel thermoplastic materials can be obtained in which besides the resin formed by polymerizing alkenylaromatic with or without acrylic and vinylic monomers, there is also a branched interpolymer the main carbon atom chain of which has a saturated elastomeric nature, whereas the chains which make up the branch-offs have a plastic character. Side-chains on the saturated rubber, which have the same composition as the non-grafted resin, favors the even dispersion of the rubber in the resin matrix so that the physical and mechanical properties of the resin are considerably improved: an improved resistance to ageing is also achieved. A styrene-acrylonitrile resin grafted on a saturated ethylene-propylene copolymer is but an example. The preparation process is carried out in solution: critical conditions, additives, adjuvants, initiators and promoters are indicated and exemplified. Irradiation with ultraviolet rays may be of help.

Abstract: Graft interpolymers comprised of a polyolefin backbone polymer prepared from at least one .alpha.-olefin of two to four carbon atoms onto which is graft copolymerized a mixture of ethylene and carbon monoxide are disclosed.

Abstract: This invention relates to a process of producing vinyl polymers by an inversion polymerization technique in the presence of a two layer coating on the internal surfaces of the polymerization reactor. By inversion polymerization is meant conducting the initial stage of the polymerization reaction wherein the monomer or monomers being polymerized constitute the continuous phase and in the latter stage of polymerization, water constitutes the continuous phase. The coatings comprise an undercoating of an alkali soluble dye dissolved in an aqueous alkali metal hydroxide solution or an ammonium hydroxide solution. The top coating is comprised of a water soluble suspending agent, such as an alkyl or alkylhydroxy alkyl cellulose ether. When polymerizing olefinic monomers, such as vinyl halides, vinylidene halides, and vinylidene monomers having at least one terminal CH.sub.2 .dbd.