Patents. A process for preparing low molecular weight, highly reactive polyisobutylene having an average molecular weight Mn of from 500 to 5000 Dalton and a terminal double bond content of more than 80 mol % by polymerization in the liquid phase of isobutene or hydrocarbon streams comprising isobutane [sic]...ccording to stage (c) the enriched and/or separated catalyst complex is then recycled, usually without further purification, to the polymerization, in the case of a multi-stage polymerization generally into the first stage. It is generally possible to recycle from 70 to 90% of the catalyst complex.
A vascular birthmark is a discoloration of the skin that is caused by blood vessels that don't form correctly. They are present at birth or appear shortly after birth. There are three major types of vascular birthmarks: Salmon patch (nevus simplex) is a flat patch of pink or red skin, often small, usually with poorly defined borders.
Styes are usually caused by a combination of a clogged oil gland and staphylococcal bacteria, which often live right on the skin surface. Our bodies are coated with billions of friendly bacteria that coexist with us. When the conditions are right, the bacteria become overabundant, resulting in the tender pimple.n internal stye (on the underside of the lid) also causes a red, painful bump, but its location prevents the familiar whitehead from appearing on the eyelid. The internal stye may disappear completely once the infection is past, or it may leave a small fluid-filled cyst that may have to be opened and drained.