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AssigneeKraton Polymers U.S. LLC
InventorsAdrie A. Van Der Huizen, Marc S. Sonderman, Arwin W. Van Der Waal, Wouter De Jong, Anton Nicolai
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A process of producing an artificial latex, comprising the steps: (a) cement formation, wherein a rubber is dissolved in a suitable hydrocarbon solvent; (b) emulsification of the cement formed in step (a), together with an aqueous soap solution, thus forming an oil-in-water emulsion; (c) hydrocarbon solvent removal, resulting in a latex of the rubber having particles of a median particle size in the range of from about 0.5 to 2.0 μm, and optionally (d) latex concentration, forming an artificial latex with a higher solids content, characterized in that in step (b) a premix is formed first, which is subsequently homogenized into an oil-in-water emulsion, and wherein the premix is formed by mixing the cement with the aqueous soap solution at a volume ratio of 1:1.5 to 1:3 using at least one homogenizer comprising a stator and a rotor, that is operated at a tip speed of the outer ring of the rotor in the range of from 8 to 16 m/s, and wherein the premix is subsequently homogenized in a rotor/stator homogenizer operated at a tip speed of the outer ring of the rotor in the range of from 16 to 35 m/s.
(canceled)
The process of claim 11, wherein additionally a static mixer is used in the preparation of the premix.
The process of claim 11, wherein a rotor/stator homogenizer (#1) is used for the preparation of the premix, and a separate rotor/stator homogenizer (#2) is used for the subsequent preparation of the oil-in-water emulsion.
The process of claim 11, wherein the premix is made in a continuous manner and the premix is recycled more than 5 times, preferably more than about 8, but less than 25 times, preferably less than 15 times.
The process of claim 11, wherein the rubber is polyisoprene rubber.
The process of claim 11, wherein the soap is a rosin type soap.
The process of claim 11, wherein the soap concentration is from 0.5 to 5.0% by weight in water.
The process of claim 11, wherein the volume ratio of soap solution versus cement is from 1:2.0 to 1:2.5.
A process of producing an artificial latex, comprising the steps:
Dependencies are inferred from the claim text.