Process for dissolving polymeric material
AssigneeAllied Colloids Limited
InventorsPeter Flesher, John G. Langley
Life of this patent
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Abstract
A dispersion of polymeric particles in a non-aqueous liquid is mixed with water with sufficient agitation to initiate substantial dissolution of the particles into water and is substantially homogeneously dispersed into the water substantially immediately, for instance in less than 50 milliseconds from the initiation of substantial dissolution. Preferred apparatus is an orifice mixer having a mixing chamber 41 leading to an orifice 51 and supplied by an inlet 46 for dispersion, the inlet terminating in a valve 47 and an orifice 44, and an inlet 45 for water. The effective outlet area of the orifice 51 is adjusted by an eccentrically mounted aperture plate 52 and there is a shear helix 57.
Claims12
A process of dissolving into water the polymer particles of a dispersion of the particles in a non-aqueous liquid using an orifice mixer, the process comprising forcing the dispersion and the water into the orifice mixer and thereby bringing the dispersion and the water into contact under high shear, and ejecting the resultant mixture from the orifice within a period of less than about 100 milliseconds from the time of contact and in which the pressure drop between the pressure where the dispersion and the water come into contact and the constant pressure of the mixture after said ejection is at least 6 kg/cm.sup.2.
Dependencies are inferred from the claim text.