A process for recovering a rubbery polymer from a rubber-in-solvent solution by steam-stripping the solution to produce rubber crumb in aqueous phase using a low molecular weight lactone copolymer as stripping aid.
A monovinyl arene, such as styrene, is polymerized with a monofunctional lithium initiator, followed by addition of a conjugated diene, such as butadiene, with additional monofunctional lithium initiator. The resultant block copolymers are coupled to give linear coupled block copolymers
Rubbery coupled conjugated diene/monovinyl-substituted aromatic hydrocarbon teleblock copolymers are prepared by incremental addition of both monovinyl-substituted aromatic hydrocarbon and initiator. The resulting copolymers can be used to produce improved pressure-sensitive adhesives.
