A polymer is metalated with a lithiating reagent and an tetraalkylethylene, the ratio of active lithium atoms in the lithiating reagent to the molecules of the amine being from 0.01 to 1.5. Such lithiated polymer may then be further reacted to introduce reactive groups of many varieties along the polymer chain. For example, polybutadiene, polyisoprene and other unsaturated polymers may be reacted with butyl lithium and triethylene diamine; and the lithiated polymer may then be reacted with carbo...

Isoprene is readily polymerized to have over 90 percent repeating isoprene units in the 1,4-cis configuration if the polymerization catalyst employed is prepared by reaction of titanium tetrachloride with an excess of dialkylaluminum fluoride. The proportions of the reactants are not critical because the resulting reduction of Ti.sup.IV does not go beyond Ti.sup.III. The alkyl bound to aluminum should have 1 to 5 carbon atoms. Ethers may be added to the catalyst reaction mixture.

Block copolymers are provided which retain a high degree of elastomeric properties while at the same time exhibiting a large water absorption capacity are especially useful for water desalinization purposes. These block copolymers comprise chlorosulfonated derivatives of block polymers wherein the terminal polymer blocks are either polyvinyl arene blocks or polyvinyl cycloalkane blocks while the center blocks are hydrogenated conjugated diene blocks or alpha-olefin copolymer blocks of elastomeri...

Improved nitrile rubbers that are readily processed, have an excellent balance of low temperature-oil swell properties and other good physical properties are prepared polymerizing a polar monomer as acrylonitrile or methacrylonitrile with a mixture of (1) an elastomer of a conjugated diene and a nitrile and (2) a polymer of a conjugated diene and a nitrile having a molecular weight below 20,000. This low molecular weight copolymer may also be liquid xanthate-, mercaptan- or carboyxl-terminated p...

A process for the polymerization of cyclopentene with ring-opening, in which cyclopentene dissolved in an inert organic solvent is polymerized in the presence of a catalyst, characterized in that an organometallic mixed catalyst of A. a molybdenum, tungsten or tantalum salt, B. tertiary butyl hypohalite, C. an organic aluminum compound in the molar ratio of a : b : c as 1 : 0.1 to 5 : 0.8 to 15 is used.

Production of cross-linked polyethylene flock by introducing a cross-linking agent and polyethylene into a zone under pressure and under a temperature sufficiently high to support cross-linking of the polyethylene and then abruptly releasing the pressure whereby a cross-linked polyethylene flocculent material is formed.

Living monolithio polymers are coupled by the action of certain novel coupling agents (e.g., nitrobenzene, sulfur, dimethyl terephthalate, acrylonitrile, maleic anhydride). For example, styrene is first polymerized in benzene with n-butyl lithium catalyst to form a styrene polymer block (S) followed by addition of butadiene to form a butadiene polymer block (B) copolymerized with the styrene block in the form of a living monolithio block copolymer SB.crclbar. Li.sym.. Then a coupling agent, such...

Copolymers are prepared from a diolefin and para tertiary butyl styrene in the presence of a Friedel-Crafts catalyst at 10.degree.-90.degree. C. The diolefin may be isoprene, piperylene and cyclopentadiene in a concentration ranging from about 95 percent to about 5 percent based upon the weight of the monomers. Resins thus produced are essentially colorless and have excellent color stability and show outstanding qualities when used in pressure sensitive adhesive systems.

This invention relates to polymers derived from the ring opening polymerization of unsaturated alicyclic compounds containing at least one alicyclic ring, said ring containing 12 carbon atoms and having two or three nonconjugated carbon-to-carbon double bonds in the cyclic ring. Methods for their preparation are also disclosed.

Impact-resistant polymers having low permeability to gases and vapors are prepared by polymerizing acrylonitrile with an alpha-olefin such as isobutylene, at least one member selected from the group consisting of an acrylic ester, a methacrylic ester, methacrylonitrile, an acrylamide, and a vinyl ester, and optionally another vinyl monomer component such as a vinyl aromatic monomer in an aqueous medium in the presence of a diene rubber. 10 Claims, No Drawings