Process for producing modified epoxy resin
First Claim
1. A process for producing a curable epoxy resin composition comprising polymer particles (B) and a curable epoxy resin (A),the polymer particles (B) comprising 5 to 50% by weight of a shell layer (B-2) and 50 to 95% by weight of a rubber particle core (B-1), andthe polymer particles (B) being in an independently dispersed state of substantially primary particles in the epoxy resin (A);
- the process comprising the steps ofbringing an organic medium (C) showing partial solubility in water into contact with an aqueous latex of polymer particles (B),then bringing an organic medium (D) having lower partial solubility in water than that of (C) into contact therewith to separate an aqueous layer substantially from the polymer particles (B),discharging the aqueous layer to obtain a dispersion (F) consisting essentially of the polymer particles (B) and the mixed organic mediums (C) and (D), without isolating the polymer particles (B) as a coagulated material,dissolving a curable epoxy resin (A) in the dispersion (F), andremoving volatile components; and
the polymer particles (B) being in an independently dispersed state of substantially primary particles in the dispersion (F).
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Accused Products
Abstract
This invention provides a process for producing an epoxy resin composition having core/shell rubber particles (rubber-like polymer particles) dispersed in an epoxy resin, wherein an epoxy resin composition excellent in the dispersed state of rubber-like polymer particles in an epoxy resin with a reduced amount of contaminants is produced easily and efficiently.
The epoxy resin composition having rubber-like polymer particles dispersed well in an epoxy resin with less contaminant is obtained by bringing an aqueous latex of rubber-like polymer particles (B) into contact with an organic medium (C) showing partial solubility in water, then bringing an organic medium (D) having lower partial solubility in water than that of the organic medium (C) into contact therewith to separate water substantially, to remove the rubber-like polymer particles as a dispersion (F) having the polymer particles dispersed in the organic medium, and mixing it with an epoxy resin (A), followed by distilling volatile components away.
21 Citations
9 Claims
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1. A process for producing a curable epoxy resin composition comprising polymer particles (B) and a curable epoxy resin (A),
the polymer particles (B) comprising 5 to 50% by weight of a shell layer (B-2) and 50 to 95% by weight of a rubber particle core (B-1), and the polymer particles (B) being in an independently dispersed state of substantially primary particles in the epoxy resin (A); -
the process comprising the steps of bringing an organic medium (C) showing partial solubility in water into contact with an aqueous latex of polymer particles (B), then bringing an organic medium (D) having lower partial solubility in water than that of (C) into contact therewith to separate an aqueous layer substantially from the polymer particles (B), discharging the aqueous layer to obtain a dispersion (F) consisting essentially of the polymer particles (B) and the mixed organic mediums (C) and (D), without isolating the polymer particles (B) as a coagulated material, dissolving a curable epoxy resin (A) in the dispersion (F), and removing volatile components; and the polymer particles (B) being in an independently dispersed state of substantially primary particles in the dispersion (F). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A dispersion (F) consisting essentially of polymer particles (B) and mixed organic mediums (C) and (D),
the polymer particles (B) comprising 5 to 50% by weight of a shell layer (B-2) and 50 to 95% by weight of a rubber particle core (B-1), and the polymer particles (B) being in an independently dispersed state of substantially primary particles in the dispersion (F); -
wherein the dispersion (F) is obtained by bringing an organic medium (C) showing partial solubility in water into contact with an aqueous latex of polymer particles (B), bringing an organic medium (D) having lower partial solubility in water than that of (C) into contact therewith to separate an aqueous layer substantially from the polymer particles (B), and discharging the aqueous layer to obtain the dispersion (F) without isolating the polymer particles (B) as a coagulated material.
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Specification