Process for preparing novel high solids non-aqueous polymer comp

Details Process for preparing novel high solids non-aqueous polymer comp Process for preparing novel high solids non-aqueous polymer comp

1994-07-12

2000-08-29

Merriam, Andrew E. C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

210787, 210789, 523342, 523343, 528502D, C08J 311

Patent

active

061109959

ABSTRACT:
The use of falling-film evaporation and a concentration means such as centrifugal separation to dehydrate and concentrate a water-in-oil polymer emulsion or suspension is disclosed. In a preferred embodiment, a water-in-oil polymer composition containing less than about 25% active polymer solids is dehydrated in falling-film evaporator to produce an evaporator concentrate containing less than about 5.0% water. The evaporator concentrate then flows to a separation device such as a centrifuge, wherein oil is removed to produce a composition that is substantially a polymer and emulsifying surfactant-in-oil composition containing in excess of about 60 weight % polymer solids. The centrifuge raffinate may optionally be treated in a second separation means to capture additional polymer solids, with optional recycle of the oil-rich raffinate. The concentrated polymer composition is preferably stabilized with a steric stabilizer to produce a free flowing liquid product.

REFERENCES:
patent: 4059554 (1977-11-01), Pacansky
patent: 4803264 (1989-02-01), Krijnen et al.
patent: 4944888 (1990-07-01), Mallya et al.
patent: 5155156 (1992-10-01), Scanley
patent: 5269941 (1993-12-01), Chave et al.
Chem. Abstracts, vol. 98, No. 26, Jun. 27, 1983, Abs. No. 216505q Water Absorbing Polymers Powder, p. 36.
Kirk-Othmer, Concise Encyclopedia of Chemical Technology, Wiley & Sons, New York, NY, 1985, p. 235.

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