Composition for external application to skin
AssigneeRohto Pharmaceutical Co., Ltd.
InventorsSachie FUJITA, Emi TAKEMOTO
Life of this patent
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Abstract
The problem addressed by the present invention is to provide a composition for external application to the skin containing a salt-resistant polymer and an acidic polysaccharide. The composition does not cause balling up of a cosmetic on the skin when a cosmetic is applied on the composition after the composition is applied on the skin. The composition for external application to the skin contains (A) a salt-resistant polymer, (B) an acidic polysaccharide, and (C) an amphipathic compound represented by the general formula (1): Z—[O-{(EO)a(PO)b}-(AO)c—H]n (1) wherein n, a, b, and c each represent a specific number; and Z, EO, PO, and AO each represent a specific group.
Claims8
A composition for external application to skin comprising:
- (A) a salt-resistant polymer;
- (B) an acidic polysaccharide;
- and
- (C) an amphipathic compound represented by general formula (1) below:
- Z—[O-{(EO)a(PO)b}(AO)c—H]n (1)
- wherein:
- n is an integer of 1 to 10;
- Z is a hydrogen atom, or a group obtained by removing n number of hydroxy group(s) from a hydroxy compound of a carbon number of 1 to 30;
- EO is an ethylene oxide group;
- PO is a propylene oxide group;
- AO is an alkylene oxide group of a carbon number of 2 to 5;
- a, b, and c each denote an average addition molar number of respective alkylene oxide groups, and are independently 0 to 200;
- provided that not all of a, b, and c are 0 at the same time;
- when n is 2 or more, respective pluralities of a's, b's, c's, and AOs may be the same as or different from one another;
- and when n is 3, the carbon number of AO is 2, 3, or 5;
- and when Z is a hydrogen atom, n is 1;
- and
- wherein the respective alkylene oxide groups in { } may be added randomly or in blocks.
Dependencies are inferred from the claim text.