A powdery linear polymer having a narrow particle size distribution with little dusting and excellent in anti-blocking property is recovered from a latex of a linear polymer containing a large proportion of soft polymer component through a two-step coagulation process including a first step causing 70\u201398 wt. The window treatment comprises a row of buttons positioned along an upper portion of the window treatment. A seal band is formed on the base and a casing is bonded to the seal band. The liquid product removed from the small pore filters will be substantially free of particulates. In use extrudable material is fed into the extruder through the inlet. The tag code results in a single variable, common to all data receiver parties, for each data element.