Abstract: A thermoplastic polymer and an article of manufacture consisting essentially of this polymer are described herein which possess excellent mechanical properties at both room and elevated temperatures. The polymer is obtained by modifying a block copolymer composed of a conjugated diene compound and an alkenyl arene compound. The block copolymer is first selectively hydrogenated and thereafter modified by grafting carboxyl containing functional groups primarily in the alkenyl arene block via metalation. The mechanical properties may be varied and controlled by varying the degree of functionalization (amount of carboxyl groups), and the degree of neutralization of the carboxyl groups from an acid to a metal carboxylate salt.

Abstract: An ultraviolet light absorbing silicone composition comprising silicone elastomer and, covalently bonded thereto, ultraviolet light absorbing component derived from one or more vinyl functional, polymerizable ultraviolet absorbing monomers having the following structures: ##STR1## and mixtures thereof, wherein X is selected from the group consisting of H, alkoxy radicals and halogen, R.sub.1 is selected from the group consisting of H and alkyl radicals, provided that at least one of X and R.sub.1 is other than H, and R.sub.2 and R are independently selected from organic radicals with a terminal double bond.

Abstract: Improved thermoplastic elastomeric compositions adopted for easy conversion, e.g., by injection molding or extrusion techniques, into useful shaped articles having good abrasion and tear resistance, and marked resistance to oils and fats, include a polyetheramide, advantageously a polyetheresteramide, and a nitrile rubber, e.g., a copolymer of 1,3-butadiene or isoprene with (meth)acrylonitrile.

Abstract: The present invention relates to thermoplastic moulding materials from polydiorganosiloxane-polycarbonate block copolymers and copolymers from styrenes and maleic anhydride and, if appropriate, further conventional additives, and also a process for the preparation of these moulding materials.

Abstract: A continuous process for the production of high impact polystyrene using a free radical initiator which decomposes to form only non-acid decomposition by-products.

Abstract: A polymer admixture is formed from a base polymer and thermoplastic copolymer additive including polar hard segments and polar and nonpolar soft blocks in graft or block copolymer form. The polymer admixture is characterized by increased contact angle hysteresis and is formed into blood and tissue-contacting surfaces of a biomedical device or into textiles. A preferred additive comprises a segmented block copolymer having polydialkylsiloxanes as nonpolar soft blocks, and a polyurethane as hard segments and a polyalkylene oxide as a polar soft block.

Abstract: A process for forming random copolymers which comprises forming a polymer melt containing one or more polyamides and one or more acidic or basic inorganic materials, such as ammonium bisulfate, ammonium biphosphate and sodium biphosphate; and heating said melt for a period of time sufficient to form the desired amount of the copolymer. The random copolymers may be fabricated into films or other products which have desirable properties, and can be useful in making injection molded or extruded products of improved properties.

Abstract: A continuous flow process for the production of high impact polystyrene, wherein specific types of polymerization inhibiting impurities are removed from a recycle stream prior to feeding or introducing the recycle stream into a styrene polymerization zone. Preferably, the process further comprises the step of monitoring the acidity of the recycle stream.

Abstract: The present invention relates to elastomeric copolymers and block copolymers, e.g., based upon styrene/isoprene, having a novel condensed phase structure wherein polymer branches occur along the polymer backbone, either at a predetermined location or at random locations. The polymers are made by a method which comprises the step of reacting, under polymerization conditions, hydrocarbyl lithium initiator, at least one anionically polymerizable compound, and an organometallic- substituted styrene condensing agent. The reactants may be added simultaneously to proudce a copolymer with polymer branch segments randomly located along the polymer backbone or sequentially to produce a copolymer with branches located at the same predetermined location along the polymer backbone. The resultant polymers may be further reacted with a linking agent to form multi-arm copolymers.

Abstract: Hybrid star polymers with functional acrylic arms made by group transfer polymerization and crosslinked cores made by condensation reactions with the functional groups on the arms.

Abstract: A star-shaped polymer useful as a polymeric VI improver comprising at least one arm which is a block copolymer containing a conjugated diolefin block and a monoalkenyl aromatic hydrocarbon block and a plurality of arms which are either a homopolymer of a conjugated diolefin or a copolymer of tow or more conjugated diolefin or a copolymer of two or more conjugated diolefins. Oil compositions comprising star-shaped VI improvers of this type exhibit relatively low HTHSR viscosities, and hence, improved fuel efficiencies when used in automotive applications. Oil compositions comprising star-shaped VI improvers of this type also exhibit improved low temperature pumpability.

Abstract: The invention concerns thermoplastic molding compositions comprising a blend of a polycarbonate resin, a conjugated diene graft polymer and an impact modifying agent characterized in that said conjugated diene graft polymer contains at least some .alpha.-methyl styrene which compositions combine improved impact strength and good HDT values.

Abstract: Hybrid star polymers with functional acrylic arms and crosslinked cores.

Abstract: A process for producing a thermoplastic elastomer comprising a block copolymer of the A-B-A' type, wherein A is a monovinyl aromatic hydrocarbon polymer block, B is a conjugated diolefin polymer block, and A' is either the same as A or a polymer block derived from a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon, which process comprises polymerizing a monovinyl aromatic hydrocarbon in a polymerization medium in the presence of an organomonolithium compound as a polymerization initiator, adding a conjugated diolefin to perform block copolymerization, and further adding a monovinyl aromatic hydrocarbon to perform polymerization or in the alternative, adding a dialkenyl aromatic hydrocarbon or a dihalogenated hydrocarbon to perform coupling, wherein the monomer components are used in such amounts that the weight ratio of (A+A') to B ranges from 10/90 to 65/35, and a chained aliphatic hydrocarbon solvent containing from 0.0001 to 0.

Abstract: Metals from Groups I and II and organometallic compounds thereof can be used to catalyze the polymerization of diene monomers into polymers. The polymers formed in such polymerizations are terminated with the metal used to catalyze the polymerization and are sometimes referred to as living polymers. Very useful blends of such polymers can be made by utilizing the process of the present invention.

Abstract: The invention relates to a process for the preparation of conductive polymers or prepolymers and to conductive polymers or prepolymers.The process of the invention consists of reacting a polymer containing ethylenic unsaturations such as a hydroxytelechelic polybutadiene with a silane compound of formula ##STR1## in which R.sub.1 denotes a hydrocarbon group containing at least one heteroatom bearing mobile electrons, such as the oxygen of an ether group, andR.sub.2 and R.sub.3 denote a substituted or unsubstituted organic residue or a group R.sub.1.The polymer obtained is precipitated by the addition of a compound which is not a solvent for the polymer, and is separated from the reaction medium.The polymers obtained have an electrical conductivity which is multiplied by a factor of 10.sup.5 relative to the unmodified polymer.The present invention applies in particular in the field of the polymer industry.

Abstract: A light curing composition for dental restoration comprises (a) a polymerizable compound containing at least one ethylenically unsaturated double-bond, (b) at least one photo-polymerization initiator selected from ketal base compounds defined hereinafter, (c) at least one photopolymerization initiator selected from thioxanthone base compounds defined hereinafter, (d) a reducing agent and (e) a filler.

Abstract: A composition comprising:(a) at least one copolymer having at least one of M.sub.w /M.sub.n less than 2 and M.sub.z /M.sub.w less than 1.8; and(b) at least one plastic composition.The composition can be produced by preparing the elastomer and then blending it with the plastic. The composition can be subjected to an additional step of curing.

Abstract: A metallic, gold colored composition comprising an olefin polymer, a mica-based gold pigment, a mica-based bronze pigment, carbon black, and optionally, a yellow pigment is provided. Additionally, a process to produce a glossy, metallic, gold colored polyolefin product in a grit blasted mold is provided.

Abstract: Elastomeric homopolymers and copolymers comprising at least one active group containing an alkali metal atom are chemically treated to incorporate at least one conjugated diolefin linkage. The chemical treatment consists of reacting the living polymers with 2,3-ethylenically unsaturated aldehyde or ketone and then converting the reaction product thus obtained to the corresponding alcohol and dehydrating the alcohol to produce the conjugated diolefin linkage. The chemically treated elastomeric homopolymers and copolymers are useful in any of the applications known in the prior art for the corresponding untreated homopolymers and copolymers. Moreover, the chemically treated elastomeric polymers may be reacted with an unsaturated monomeric dienophile through a 4+2 Diels Alder addition reaction and a polymer then grafted onto the chemically treated elastomeric polymer or the chemically treated elastomeric polymer may be reacted directly with another (different) polymer containing at least one dienophile group.