Other

Kraton Polymers U.S. LLC

Barry B Moore

Carl Lesley Willis

Robert Charles Bening

Harvey E Atwood

Marinus Pieter Van Dijk

Nikolaas Jan Van Dijk

Adriana Maria Petronella Ros

Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.

Coupled styrenic block copolymers and process for preparing same

A towline depressor (2) having forward and rearward ends with a main body portion (4) at the forward end. Wings (6) and (8) extend from the body with stabilizing fins (10) and (12) depending from the wings. A dorsal fin (14) having holes (16), (18) and (20) extends from the top center of the body for attaching the depressor to a towline. The holes permit attaching the towline at varying points relative to the center of gravity of the depressor.

Towline depressor

Growing community of inventors

Danville, NH, United States of America

Barry B Moore