Abstract: An acrylic fiber having improved basic dyeability and the method for making the same wherein an acrylic polymer containing a sulfonated vinyl monomer as a part thereof is dissolved in a suitable solvent to form a spinning dope and a solution of a second or additive polymer dissolved in the same solvent is added to the dope which is then spun to form fibers. The second polymer is selected from the group consisting of cellulose triacetate, polymethyl methacrylate, polyvinyl chloride, a polyamide of hexamethylenediamine with 1,1,3-trimethyl-5-carboxy-3-(p-carboxyphenyl) indane and a polyamide of hexamethylene diamine with isophthalic acid. The spin dope will contain 10 to 35 weight percent of polymer solids, with the amount of the second or additive polymer being 0.5 to 25 weight percent of the total polymer solids. Fibers spun from the dope have enhanced basic dyeability. The method is effective only when the acrylic polymer contains a sulfonated vinyl monomer as part of the acrylic polymer backbone.

Abstract: Disclosed is an acrylic fiber having improved basic dyeability. The fiber is made by a process wherein a copolymer of an acrylic monomer and a sulfonated vinyl monomer is dissolved in a solvent to form a spinning dope and a solution of polystyrene in the same solvent is added to the dope prior to spinning the dope to form fibers. The polystyrene will be in the form of a separate phase dispersed throughout the spinning dope and the fibers formed from the dope. Fibers formed from this polystyrene-containing dope have improved basic dyeability.

Abstract: Homogeneous blends are provided comprising a diblock copolymer of isoprene and butadiene and a homopolymer constituent which is polyisoprene, polybutadiene or mixtures of polyisoprene and polybutadiene.

Abstract: A vinylidene chloride copolymer composition is produced by copolymerizing 60 to 95 wt. % of vinylidene chloride and 40 to 5 wt. % of a comonomer in the presence of a rigid polymer which has a softening temperature of 50 to 180.degree. C. and a melt viscosity of 0.1 to 500 poise at 170.degree. C. and is soluble in vinylidene chloride monomer and is not substantially miscible to the vinylidene chloride copolymer, at a ratio of 0.01 to 5 wt. parts per 100 wt. parts of the monomer mixture.

Abstract: The impact strength of styrene-acrylonitrile copolymer is significantly improved without loss of injection moldability by the addition thereto of ethylene-vinyl acetate copolymer or ethylene-vinyl acetate-vinyl alcohol terpolymer together with a chlorinated polymer such as polyvinyl chloride or chlorinated polyethylene.

Abstract: Compatibilized blends and composites of(a) a thermoplastic copolymer of an alkenyl aromatic monomer and an alkenyl nitrile monomer together with(b) a thermoplastic copolymer of ethylene and a vinyl ester are formed by mixing the copolymers in the presence of an acid compatibilization agent prior to, concurrently with, or subsequent to, mild cross-linking of copolymer (b).

Abstract: Light-transmitting compositions containing (1) 50-99% by weight of polyvinylidene fluoride or a vinylidene fluoride copolymer and (2) 1-50% by weight of a copolymer of a vinyl fluoride monomer and at least one acrylate monomer selected from the group consisting of alkyl acrylates and alkyl methacrylates wherein the alkyl group contains from one to four carbon atoms.

Abstract: Acrylic fibers of a fiber-forming first acrylonitrile polymer containing at least 50% acrylonitrile, a flame retardant amount of a halogen-containing vinyl monomer, and any balance of a halogen-free vinyl monomer having heterogeneously dispersed therein a small amount of an incompatible, halogen-free, second acrylonitrile polymer containing at least 70% acrylonitrile and one or more halogen-free vinyl monomers. The fibers are prepared by wet-spinning an intimate mixture of the polymers separately dissolved in aqueous inorganic solutions of the same salt following conventional procedures but including a hot-wet relaxation of the stretched wet-gel filaments prior to drying.

Abstract: The gas permeability of a polymeric material is altered by irreversibly mechanically stressing in at least one direction a polymeric material which is a mixture of two phases where one phase is evenly distributed throughout a second phase and one phase is present in an amount of at least 10 weight percent. The phases are polymeric materials which each have an elastic shear modulus of less than 10.sup.9 dynes per square centimeter at processing temperature, are chemically dissimilar materials and have oxygen gas permeabilities which differ by a factor of at least 10. At least one phase is a thermoplastic which is solid at ambient temperature and the mixture retains its physical state on standing at ambient temperature over extended periods of time. An example would be cold rolling a sheet of a polyblend of polyethylene and polydimethylsiloxane.

Abstract: Non-inflammable filaments having good physical characteristics are disclosed, wherein the filaments have a chlorine content of 25-40% by weight and a sticking temperature of at least 215.degree.C, and a shrinkage of less than 32% when subjected to steam at 130.degree.C in the free or unrestrained state. The filaments are formed by spinning a mixture of incompatible polymers, one polymer, used in an amount of 50-99% by weight, containing 79.5 to 58 weight percent of acrylonitrile units, 20-40 weight percent of vinylidene chloride units and 0.5 to 2 weight percent of a comonomer which enhances dyeability, and the other copolymer, used in an amount of from 1-50 weight percent, containing from 20-50 percent by weight of acrylonitrile units and 50-80 percent of vinylidene chloride units.The filaments may be used in textile applications, such as for clothing, furniture upholstery, and the like.

Abstract: The present invention describes a process of producing block copolymers from monomers of different types by polymerization in two successive steps. The first step consists in polymerizing monomers of a first type by means of coordinated anionic catalysts comprising organo-metallic compounds of a metal of the Group IA, IIA, IIIA, or mixtures thereof of Mendeleev's Periodic Table of Elements, associated with a transition metal compound of Group IV to VIII and the second step comprises polymerizing a second type of monomer in the presence of the polymer formed in the first step and in the presence of free radical catalysts, wherein 0.01 to 100 moles of an adjuvant per mole of transition metal compound is added to the reaction medium of the first step and this adjuvant consists of a compound MY.sub.