C - Chemistry – Metallurgy – 08 – C
Patent
C - Chemistry, Metallurgy
08
C
C08C 1/02 (2006.01) C08C 1/065 (2006.01) C08C 1/075 (2006.01)
Patent
CA 2198446
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 x 10 6 Pa to about 6.9 x 10 7 Pa at a temperature which is within the range of about 120°F to about 170°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.
Grâce au procédé de cette invention, on peut obtenir des latex de caoutchouc nitrile, avec une teneur de plus de 60 % en matières solides, à partir de latex de caoutchouc nitrile à moins de 30 % de teneur. L'invention présente plus spécifiquement une méthode pour augmenter la teneur en solides d'un latex de caoutchouc de nitrile à faible teneur en solides, consistant à :1) concentrer ce dernier type de latex par élimination de l'eau présente de façon à obtenir un latex de nitrile à teneur intermédiaire en solides, soit entre 35 et 45 % environ, le latex à faible teneur en solides renfermant moins de 30 % environ de solides; 2) à soumettre le latex de caoutchouc de nitrile à faible teneur en solides à une pression se situant entre 3,45 x 10 6 Pa et 6,9 x 10 7 Pa à une température comprise entre 120 degrés F et 170 degrés F pour l'obtention d'un latex de caoutchouc de nitrile aggloméré sous pression; 3) à concentrer ce dernier latex par élimination de l'eau pour l'obtention d'un caoutchouc de nitrile à haute teneur en solides, soit environ 60 %.
Burroway Gary Lee
Dunn Edwin Reed
Smart & Biggar
The Goodyear Tire & Rubber Company
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