impeller creates a region of high shear in the area where the change in pitch angle occurs and it is preferable that the change occurs closer to the sides of the mixing vessel the pitch angle preferably changes at a distance that is from about 32 to about 68 of the radius of the mixing vessel as measured from the impeller shaft radially to the sides of the vessel a mixing vessel suitable for use in the practice of the present invention can be any that is conventional in the mixing art except that the vessel cannot be equipped with baffles a vessel of the present invention is optionally equipped to enable recirculation of the mixed fluid such that the fluid is added perpendicular to the surface of the mixture in any event it is preferable that the recirculated mixture be added in the region of the impeller in such a way that the vortex formed by the rotation of the impeller in the fluid mixture is disrupted to the point of elimination pva and water can be added to an empty mixing vessel however the vessel preferably includes some water before addition of the pva and water starts if present before addition begins water is preferably at less than 50 of the volume of the vessel the pva and water can be added together as a mixture or as separate components it is preferable to add the pva and water as separate components such that they are added to the vessel in a ratio of at least about 14 by weight based on the.