Process for the manufacture of polymers

Details Process for the manufacture of polymers Process for the manufacture of polymers

1989-06-12

1991-06-04

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263171, 5263182, 5263285, 5263297, 526346, 526 59, C08F 210, C08F2180, C08F2220

Patent

active

050215256

ABSTRACT:
A process for the preparation of polymers containing at least one hydrophilic monomeric component and at least one hydrophobic monomeric component comprising the step of polymerizing the monomers in the presence of free radical polymerization initiators in an aqueous medium consisting of water and a cosolvent, wherein the amount of cosolvent is monitored so as to maintain the ratio of water to cosolvent equal or greater than unity during the reaction, thereby keeping the polymer as it forms in a sufficiently mobile condition and preventing homopolymerization and precipitation of the polymer from the hydrophobic monomer; thereby producing a polymer as a relatively high solids, low viscosity, opaque or semi-opaque product which is stable and slightly cloudy, opaque or semi-opaque, which exhibits no gelling, coagulation or product separation on standing and which, upon dilution to 0.25% solids content w/w, has a turbidity of at least 10 Nephelometric Turbidity units.

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"Random Copolymers as Dispersion Stabilisers, Part 1 Synthesis and Solution Properties", Buscall et al. Colloids and Surfaces, 17(1986 25-38; Elsevier Science Publishers B. V., Amsterdam--Printed in The Netherlands.

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