Atlantic Richfield Company

David R Warfel

Alvin R Ingram

Elizabeth A Blommers

Ralph Milkovich

Harold L Nicholson

Cloudy material in organic diluent solutions of macromonomers, prepared by anionic polymerization with a lithium initiator and termination with a halogen-containing terminating agent is removed by treating the polymer solutions resulting from the polymerization with an adsorbent selected from an alkaline earth metal silicate, an ion exchange resin, and a mixture of the silicate and ion exchange resin composition, separating the solid material from the solutions, and isolating the macromonomer.

Purification of polymer solutions

Cloudy material in organic diluent solutions of polymers prepared by anionic polymerization with a lithium initiator is removed by treating the polymer solutions resulting from the polymerization with boric acid, separating the solid material from the solutions, and isolating the polymer.

Footwear compounds having greater hardness of compound and more resistance to motor oils have been prepared starting with star-block elastomers of monovinyl aromatic compounds and conjugated dienes. The star-block elastomers have 7 to 12 arms.

Star elastomers in footwear compounds

Coated beads which exhibit anti-lumping properties upon pre-expansion and which are useful in the formation of soft expanded articles are prepared by coating initial polystyrene beads, in suspension, with a coating composition comprising styrene and a macromonomer of styrene and isoprene or styrene and butadiene, the coating compositions added to the suspension as an aqueous emulsion containing a catalyst and a polyoxyethylene ether of nonylphenol or octylphenol as surfactant.

Coated beads with macromonomer-styrene polymerizate coating

A continuous anionic solution process for preparing star-block copolymers of monovinylaromatic compounds and conjugated dienes having either monomodal or bimodal arm structure is described. The process utilizes a continuous tubular reactor made up of a sequence of four static mixer zones followed by a pressure control valve.

Continuous process for making star-block copolymers

Process for producing coated beads with macromonomer-styrene

A method of preparing oil-extended elastomer and shoe sole compound as an integral part of the anionic polymerization process for making elastomer is presented. The method eliminates the step of isolating the neat elastomer and of reheating the elastomer to compound it into the final product.

Direct production of elastomer compound from reactor solution

Polymeric beads for use in forming soft molded articles of low density are produced by formation of a plasticized elastomer-styrene polymeric coating about initial styrene beads, by forming an aqueous suspension of the initial beads, adding thereto an aqueous emulsion of a coating composition consisting of styrenic monomer, a conjugated diene elastomer, and a plasticizer, containing a catalyst and a nonionic surfactant comprising an ethylene oxide condensate of an alkylphenol, the surfactant containing at least thirty moles of ethylene oxide per mole of alkylphenol, and polymerizing the coating composition about the initial beads.

Growing community of inventors

Exton, PA, United States of America

David R Warfel