Process for increasing the solids content of nitrile rubber late

Details Process for increasing the solids content of nitrile rubber late Process for increasing the solids content of nitrile rubber late

1996-06-18

1997-10-14

Weber, Thomas R.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C08C 114

Patent

active

056773684

ABSTRACT:
By utilizing the process of this invention, nitrile rubber latices having solids contents of greater than 60 percent can be prepared from standard nitrile rubber latices having solids contents of less than 30 percent. The present invention more specifically discloses a process for increasing the solids content of a low solids nitrile rubber latex which comprises the steps of (1) concentrating the low solids nitrile rubber latex by removal of water therefrom to produce an intermediate solids nitrile rubber latex having a solids content which is within the range of about 35 percent to about 45 percent, wherein the low solids nitrile rubber latex has a solids content which is less than about 30 percent; (2) subjecting the intermediate solids nitrile rubber latex to a pressure which is within the range of about 3.45.times.10.sup.6 Pa to about 6.9.times.10.sup.7 Pa at a temperature which is within the range of about 120.degree. F. to about 170.degree. F. to produce a pressure agglomerated nitrile rubber latex; and (3) further concentrating the pressure agglomerated nitrile rubber latex by removal of water therefrom to produce a high solids nitrile rubber latex having a solids content of greater than about 60 percent.

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patent: 3795647 (1974-03-01), Ripley-Duggan
patent: 3892702 (1975-07-01), Burke, Jr.
patent: 4103074 (1978-07-01), Hertel et al.
patent: 4623678 (1986-11-01), Moore et al.

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