Abstract: Biocompatible polymeric microspheres having an average diameter below about 3 microns and having density at least 15% greater or lesser than organic cells and having covalent binding sites are provided in accordance with this invention. The microspheres are obtained by copolymerizing a hydroxy or amine substituted acrylic monomer such as hydroxyethylmethacrylate with a light or dense comonomer such as a fluoromonomer. A lectin or antibody is bound to the hydroxy or amine site of the bead to provide cell specificity. When added to a cell suspension the marked bead will specifically label the cell membrane by binding to specific receptor sites thereon. The labelled membrane can then be separated by density gradient centrifugation.

Abstract: A curable composition comprising a polybutadiene rubber having bromine bonded to at least one of its ends, and at least one amino acid selected from the group consisting of arginine, lysine, hydroxylysine and ornithine, and a curable composition comprising a polybutadiene having bromine bonded to at least one of its ends, a flowable epoxy resin, and at least one amino acid selected from the group consisting of arginene, lysine, hydroxylysine and ornithine.

Abstract: A method of producing a polymer or copolymer solution of vinyl chloride series, wherein polymerization of 100 parts by weight of a monomer mixture of at least 50 weight percent of vinyl chloride and less than 50 weight percent of one or more monomers copolymerizable therewith is carried out in a solvent mixture consisting essentially of 30 to 55 weight percent water, remainder N,N-dimethyl formamide, in the presence of 0.5 to 5 parts by weight of a salt of a monomeric compound having a sulphonic acid group and using an initiator for radical polymerization.

Abstract: Linear copolymers of glycidol, glycidyl esters of unsaturated fatty acids and, optionally, alkylene oxides, are made by the reaction of an unsaturated fatty acid with a polymer or copolymer of tert.-butyl glycidyl ether in the presence of an acid catalyst. The products are polymerizable and copolymerizable with vinyl monomers and are useful as curable resins.

Abstract: A novel oil- and water-repellent composition which comprises a copolymer of at least 25 weight percent of a fluoroalkyl monomer and an alkylvinyl ether having the formula: CH.sub.2 =CH-OR wherein R represents a halogen substituted lower alkyl group.

Abstract: Novel N-(m or p-vinylbenzyl)aziridines are disclosed which correspond to the structural formula ##EQU1## wherein R and R' are hydrogen or lower alkyl. They are highly reactive difunctional monomers which can be homopolymerized or copolymerized to form many useful polymers.

Abstract: There is disclosed a process for forming modified polymers of: (1) a bis(hydrocarbyl) vinylphosphonate; (2) optionally, a crosslinking monomer containing two or more ethylenically unsaturated bonds; and (3) optionally, one or more comonomers which contain one ethylenically unsaturated bond. The products formed by this process which contain any of the above mentioned monomers are substantially free of unreacted residual bis(hydrocarbyl) vinylphosphonate. The process comprises the post-addition of a monoethylenically unsaturated monomer, the monomer being selected from the group consisting of the vinyl and vinylidene chlorides and bromides and the C.sub.1 -C.sub.20 dialkyl esters of maleic and fumaric acids, to the polymerization medium containing the vinylphosphonate and any optional monomers after the percent conversion of monomers in the polymerization medium has exceeded about 40%.

Abstract: Free flowing polychloroprene powder can be produced from standard latexes by adding 1 - 10% of a salt of an alkyl sulfate, such as sodium lauryl sulfate to an acidified latex and precipitating the rubber in a coagulating solution, separating the particles and drying them. It was also found that the precipitated polychloroprene particles could be made stable in alcohols and ketone (which affords a simpler drying procedure) by adjusting the pH of the mixture of latex and coagulating solution to about 7.25.

Abstract: Disclosed are chlorinated low unsaturation rubbers exhibiting improved adhesion properties and improved covulcanization ability with high unsaturation rubbers. Also disclosed is a method of preparing these rubbers which comprises reacting the chlorinated rubber with certain bromine and/or iodine containing compounds.

Abstract: Acrylate rubbers having both halogen and carboxyl cure sites are vulcanized using an alkali metal salt of a carboxylic or organo-phosphoric acid and an amine-blocked isocyanate. The vulcanized compositions exhibit low press-cured and post-cured compression set.

Abstract: Polyalkenamers are produced by a ring-opening polymerization of cyclic olefins employing a catalyst system comprising (1) a tungsten or molybdenum compound; (2) an organoaluminum compound; (3) a vinylic chloride, bromide or iodide; and, optionally, (4) a compound containing a hydroxyl or sulfhydryl group; and conducting the polymerization in the presence of an ethylenically unsaturated halogenated hydrocarbon wherein one of the double bonded carbon atoms is substituted by chlorine, bromine or iodine or halogenated alkyl or aryl and at least one hydrogen atom.

Abstract: Polymeric compositions comprising the product of the addition polymerization of N-vinylcarbazole and at least one member selected from the group consisting of N-vinylphthalimide and the isostructural modifications thereof. Many of the above polymeric products are photoconductive and, thus, are suitable for use in electrophotography.

Abstract: Brominated esters of copolymers of maleic anhydride and a compound containing ethylenic unsaturation, e.g., tribromoneopentyl ester of styrene-maleic anhydride, useful as flame retardants for polystyrene, are compatable with polystyrene and heat stable above temperatures used for processing polystyrene.

Abstract: The mono- or diester of phosphoric acid and a straight chain alkanol of 8 to 10 carbon atoms is used as a surfactant in the emulsion polymerization of olefinic compounds, especially vinyl compounds, to obtain polymers having improved stability to light and heat.

Abstract: Vinyl chloride monomer, or a monomeric mixture comprising vinyl chloride as a main component and other monomers co-polymerizable therewith in an aqueous reaction medium, is polymerized in a polymerization vessel. All of the surfaces of the inside walls of the vessel and the agitator blades, the baffle plates and the like with which the vessel is equipped, are coated prior to the polymerization with at least one of a specific class of nitrogen-containing aromatic heterocyclic compounds. Not only is the deposition of polymer scale surprisingly reduced, but also the polymer thus obtained has good physical and chemical properties.

Abstract: Alpha-methyl-p-bromo-styrene prepared by the manipulative steps of brominating poly(.alpha.-methyl-styrene) and subsequently depolymerizing the brominated polymer. The alpha-methyl-p-bromo-styrene has particular utility as a co-monomer for preparing copolymers exhibiting a flame retardancy.

Abstract: Conjugated diolefinic polymers having a molecular weight of less than 1,000,000 can be produced at high polymerization rates and in high yields by polymerizing a conjugated diolefin or copolymerizing a conjugated diolefin with a vinyl aromatic hydrocarbon in the presence of an alfin catalyst, in which as a molecular weight regulator is used a halogenated unsaturated hydrocarbon represented by the formula, ##EQU1## wherein R is an alkyl group having 1 to 7 carbon atoms, a vinyl group, a phenyl group, an alkyl-substituted phenyl group, a halogen atom or a hydrogen atom, and X, Y and Z which may be same or different are individually a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, at least one of the R, X, Y and Z being a halogen atom.