W/o nanoemulsion and method for producing same

A method for producing a W/O type emulsion comprising:

• a) water:
• more than 0 wt % but no more than 30 wt %;
• b) oil:
• less than 100 wt % but no less than 70 wt %;
• c) at least one nonionic surfactant having an HLB value of 1 to 10:1 to 30 parts by weight, which are normalized in a case where an amount of the oil is considered as 100 parts by weight;
• and
• d) at least one selected from the group consisting of anionic surfactants, cationic surfactants and amphoteric surfactants:
• 0.1 to 30 parts by weight, which are normalized in a case where an amount of the water is considered as 100 parts by weight,
• wherein 50% average particle size of the water particle in the W/O type emulsion is 100 nm or less,
• the method comprising the steps of:
• i) preparing the a) water;
• ii) preparing the b) oil;
• iii) preparing the c) nonionic surfactant;
• iv) preparing the d) surfactant;
• and
• v) mixing the a) to d);
• to obtain the W/O type emulsion.