2results about How to "Excellent stability over time" patented technology

Provided are: a production method for a liquid containing a carboxyl group-containing resin, which is excellent in stability over time; and a stabilization method for a carboxyl group-containing resin. The production method for a liquid containing a carboxyl group-containing resin according to the present invention is characterized by comprising: a process A of synthesizing a first liquid containing a carboxyl group-containing resin by causing a reaction intermediate obtained by reacting an epoxy compound (a) with an unsaturated monobasic acid (b) to react with a polybasic acid dianhydride (c) and a polybasic acid monanhydride (d) in an organic solvent; and a process B of obtaining a second liquid containing a carboxyl group-containing resin by adding water to the aforementioned first liquid containing a carboxyl group-containing resin.

This invention provides an oil-in-water emulsion cosmetic that can stably incorporate an oil with an IOB value of 0.2 to 0.8 and which is solid at 25°C into a liquid oil-in-water emulsion cosmetic, providing an excellent user experience with no stickiness, tightness, or penetration. This invention is an oil-in-water emulsion cosmetic containing: (A) an oil with an IOB value of 0.2 to 0.8 and which is solid at 25°C; (B) an oil with an HSP distance Ra of less than 7.0 from component (A) and which is liquid at 25°C; (C) one or more components selected from the group consisting of phospholipids and lysophospholipids; and (D) one or more components selected from ethanol and polyols with an IOB value of 1.5 to 5, wherein the average particle size of the emulsion droplets is less than 400 nm.