Shiseido has been granted a patent for a water-in-oil emulsion cosmetic that provides a replenishing and smooth feel, while minimizing the appearance of skin roughness and discoloration. The cosmetic contains metallic soap-treated powder and a water-absorptive polymer with a carboxyl group. The polymer can absorb 10-1,000 times its own weight. The cosmetic also includes aggregates formed between the water-absorbing polymer and the extender pigment treated with the metal soap. GlobalData’s report on Shiseido gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Shiseido, Nanoemulsion cosmetics was a key innovation area identified from patents. Shiseido's grant share as of September 2023 was 27%. Grant share is based on the ratio of number of grants to total number of patents.
Water-in-oil emulsion cosmetic with metallic soap-treated powder and water-absorbing polymer
A recently granted patent (Publication Number: US11771640B2) describes a water-in-oil emulsion cosmetic formulation. The cosmetic comprises three main components: (A) an extender pigment treated with a metal soap, (B) a water-absorbing polymer with carboxyl groups, and (C) water. The cosmetic contains aggregates formed between the water-absorbing polymer and the extender pigment.
The extender pigment, which makes up 0.5% to 15% of the cosmetic's mass, can be mica, talc, or barium sulfate. The metal soap used to treat the extender pigment is selected from magnesium myristate, zinc myristate, and aluminum myristate. The water-absorbing polymer with carboxyl groups, comprising 0.01% to 2% of the cosmetic's mass, can be sodium poly(acrylic acid) or sodium polyacrylate starch. It has a water absorption capacity of 10 times to 1000 times its weight.
The patent also provides variations of the cosmetic formulation. Claim 6 specifies that the water-absorbing polymer should have a water absorption capacity of 10 times to 500 times its weight. Claim 7 expands the options for the metal soap to include zinc stearate and aluminum stearate, while the water-absorbing polymer options remain the same. Claim 8 reiterates the extender pigment options as mica, talc, or barium sulfate.
Claims 9 and 10 narrow down the metal soap to magnesium myristate and specify the water-absorbing polymer options as sodium poly(acrylic acid) or sodium polyacrylate starch. The extender pigment options remain the same.
This patent highlights a specific formulation for a water-in-oil emulsion cosmetic, emphasizing the use of an extender pigment treated with a metal soap and a water-absorbing polymer with carboxyl groups. The combination of these components forms aggregates within the cosmetic. The patent provides various options for the extender pigment, metal soap, and water-absorbing polymer, allowing for flexibility in the formulation.