Process for dewatering a grafted rubber latex
AssigneeMonsanto Company
InventorsRobert L. Kruse, Wan C. Wu
Life of this patent
Estimating the term…
Abstract
The invention relates to a process for dewatering an aqueous latex containing rubber particles grafted with alkenyl aromatic and alkenyl nitrile monomers and emulsified with an anionic surfactant wherein alkenyl aromatic and alkenyl nitrile monomers are dispersed in said latex along with a cationic surfactant in an amount sufficient to deemulsify said grafted rubber particles. The grafted rubber particles are extracted from the aqueous phase into the monomer phase as a liquid oil phase, with the aid of the cationic surfactant, said aqueous phase forming a separate water phase essentially free of said oil phase followed by separating said water phase from said liquid oil phase.
Claims18
A process for dewatering a grafted diene rubber aqueous latex comprising:
- A. mixing a grafted diene rubber latex, said diene rubber being rubber particles grafted with alkenyl aromatic and alkenyl nitrile monomer, said rubber particles being emulsified in said aqueous latex by an anionic surfactant, with an alkenyl nitrile monomer and optionally an alkenyl aromatic monomer,
- B. dispersing a cationic surfactant into said latex an amount sufficient to deemulsify said rubber particles,
- C. extracting said grafted diene rubber particles into said monomers as a liquid oil phase, said aqueous latex forming a separate water phase, and
- D. separating said water phase from said liquid oil phase, said oil phase having said grafted diene rubber particles evenly dispersed therein and being essentially free of said water phase.
A process for dewatering a grafted diene rubber aqueous latex comprising:
- A. mixing a grafted diene rubber latex, said diene rubber being rubber particles grafted with alkenyl aromatic and alkenyl nitrile monomer, said rubber particles being emulsified in said aqueous latex by an anionic surfactant, with said latex an acrylonitrile monomer and optionally a styrene monomer,
- B. dispersing a cationic surfactant into said latex in an amount sufficient to deemulsify said grafted rubber particles,
- C. extracting and dispersing said grafted diene rubber particles into said monomers uniformly and essentially free of water forming a liquid oil phase, said aqueous latex forming a separate water phase, and
- D. separating said water phase from said liquid oil phase.
Dependencies are inferred from the claim text.