JP-7855876-B2 - Pack cosmetics

Inventors

• 藤田 麻奈
• 村上 大
• 小森 咲

Assignees

• 日油株式会社

Dates

Publication Date

20260511

Application Date

20220308

Claims (2)

1. A cosmetic pack containing 10 to 50% by mass of clay mineral (a), 0.1 to 1% by mass of thickening polysaccharide (b), 0.05 to 5% by mass of nonionic surfactant (c) with an HLB of 13 to 16, and 0.0005 to 0.25% by mass of copolymer (d) obtained from a monomer mixture containing monomers represented by the following formulas (1) and (2), wherein the mass ratio of component (b) to component (d) [(b)/(d)] is 1 to 200. (In the formula, R1 represents a hydrogen atom or a methyl group, and n is an integer from 1 to 4.) (In the formula, R2 represents a hydrogen atom or a methyl group, L1 represents -C6H4-, -C6H10- , -( C =O) -O- , -(C=O)-NH-, -O-(C=O)-, and L2 represents an alkyl group having 10 to 22 carbon atoms.)
2. Furthermore, the pack cosmetic composition according to claim 1, comprising proteoglycan (e).

Description

This invention relates to a cosmetic pack. Face masks are special care products used a few times a week, separate from daily skincare products, and their primary purpose is to improve the condition of the skin on the face, body, and other areas. Their main functions are "moisturizing and revitalizing the skin" and "removing impurities while conditioning the skin (removing dirt from the skin surface, moisturizing, and revitalizing)." These face masks effectively remove impurities that are difficult to remove with daily skincare products and also have skin-conditioning effects, making them effective for maintaining good skin condition. Among these, "mud packs" are widely used cosmetic packs. Mud packs are cosmetic packs that utilize the adsorptive power of mud (clay) to remove dirt from the skin, and are also expected to have skin conditioning effects through the addition of minerals. Compositions mainly containing clay minerals and combined with nonionic surfactants and oils have been disclosed (Patent Documents 1 and 2). Mud packs, which contain a high concentration of mud, are popular as a product with particularly high dirt-absorbing properties. These packs are applied to the skin, allowed to dry, and then rinsed off to allow the mud to firmly absorb the dirt. However, concerns remain regarding reduced spreadability on the skin due to the high mud concentration and dryness after washing. Patent Document 3 discloses a pack cosmetic containing clay minerals, an anionic surfactant, an oily component, a water-soluble polymer compound, and a polyhydric alcohol. This pack cosmetic spreads well and is excellent at leaving the skin feeling fresh and smooth after use, but it requires thorough scrubbing to rinse off, leaving room for improvement in reducing the burden on the skin. Mud masks tend to flake off when they dry, so they are mainly used in the bathroom, timed to coincide with bathing. In recent years, the number of people who wash their face in the morning has increased, and mud masks, which have cleansing and skin-conditioning effects, are increasingly being used as an out-of-bath morning cleanser. Therefore, in addition to their conventional functions, there is a growing demand for mud masks that do not easily flake off when they dry on the skin. In other words, there was a need for a face mask cosmetic that could be spread smoothly on the skin, would not easily peel off once dry, could be washed off without rubbing, and would leave the skin feeling smooth after washing. Japanese Patent Publication No. 2009-215256International Publication No. 2014/157265Japanese Patent Publication No. 2006-206448 Embodiments of the present invention will be described below. Various modifications are possible without departing from the spirit of the present invention. In this specification, numerical ranges defined using the symbol "～" include the numbers at both ends (upper and lower limits) of "～". For example, "2～5" means 2 or more and 5 or less. Furthermore, when a concentration or quantity is specified, it is possible to associate any higher concentration or quantity with any lower concentration or quantity. For example, if the description states "2 to 10% by mass" and "preferably 4 to 8% by mass," the descriptions "2 to 4% by mass,""2 to 8% by mass,""4 to 10% by mass," and "8 to 10% by mass" are also included. Furthermore, "(meth)acrylate" refers to either acrylate or methacrylate. The present invention's cosmetic pack contains at least the following: (a) clay mineral (hereinafter sometimes referred to as component (a)), (b) thickening polysaccharide (hereinafter sometimes referred to as component (b)), (c) nonionic surfactant with an HLB of 13-16 (hereinafter sometimes referred to as component (c)), and (d) copolymer obtained from a monomer mixture containing the monomers represented by the following formulas (1) and (2) (hereinafter sometimes referred to as component (d)). These components will be described sequentially below. [Component (a): Clay mineral] The component (a) used in the present invention is a clay mineral. The clay mineral (a) is a silicate mineral, talc, and mica, and one of these may be used alone, or two or more may be used in appropriate combinations. Examples of silicate minerals include phyllosilicate minerals (kaolin group, montmorillonite group, clay mica group, chlorite group, serpentine group, etc.) and tectosilicate minerals (zeolite group, etc.). Specific examples of clay minerals include pyrophyllite, talc, chlorite, chrysotile, antigorite, lizardite, kaolinite, deckite, nacrite, halosite, montmorillonite, nontronite, saponite, soconite, bentonite, sodium zeolite group (sodium zeolite, mesozeolite, scolecite, thomsonite, etc.), stilbite group (sodium zeolite, stilbite, stilbite, etc.), zeolite (anthosilicate, doubestilite, crucicate, rhodochrosite, gmelinite, etc.), and lite. Clay minerals are classified into water-swellable clay minerals (a1) (hereinafter sometimes referred to as com