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Sprayable Oil/Water sunscreen formulation with silicone ingredients

IP.com Disclosure Number: IPCOM000235706D
Publication Date: 2014-Mar-21
Document File: 6 page(s) / 240K

Publishing Venue

The IP.com Prior Art Database

Abstract

The purpose of this work was to develop a sprayable sunscreen lotion using silicone materials. Recently, many types of sunscreen products are available in global market. Sprayable sunscreen lotion is one of them and is becoming very popular in the Japan market. It is designed to protect the skin against UV rays, whilst helping to make makeup last and keep skin smooth. It is claimed to leave no white residue or sticky feeling, and prevent excess sebum that causes makeup fading or creasing. Although it is very convenient, the current products still have stickiness and heavy feeling mainly coming from the UV absorbers and therefore uncomfortable to wear. In this study, O/W formulations containing specific silicone materials were developed overcoming the drawbacks of the existing commercial formulations. It has less tackiness and is comfortable to wear.

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Title

Sprayable Oil/Water sunscreen formulation with silicone ingredients

Author

Yasue Kanzaki, Dow Corning Toray Co., Ltd. Japan

Isabelle Van Reeth, Dow Corning(China) Holding Co,China

Abstract

The purpose of this work was to develop a sprayable sunscreen lotion using silicone materials. Recently, many types of sunscreen products are available in global market. Sprayable sunscreen lotion is one of them and is becoming very popular in the Japan market. It is designed to protect the skin against UV rays, whilst helping to make makeup last and keep skin smooth. It is claimed to leave no white residue or sticky feeling, and prevent excess sebum that causes makeup fading or creasing. Although it is very convenient, the current products still have stickiness and heavy feeling mainly coming from the UV absorbers and therefore uncomfortable to wear. In this study, O/W formulations containing specific silicone materials were developed overcoming the drawbacks of the existing commercial formulations. It has less tackiness and is comfortable to wear.

Introduction

Silicone emulsifiers have been used for more than 20 years and became very popular in skin care products as they help to improve the sensory feel of the formulations especially reducing the tacky skin feel. One of the issues with these materials was the low stability of low viscosity O/W formulation. To improve the stability, materials such as Sodium Polyacrylate delivered in Dimethicone ( Dow Corning® RM 2051 Thickening agent) or a mixture of Silicone polyether ( Dow Corning® FB-2540 Emulsifier Blend) were developed, but could not make stable systems when formulating high level of UV absorbers due to insufficient compatibility.

Lauryl PEG/PPG-18/18 Methicone (Dow Corning® 5200 Formulation Aid) is a w/o emulsifier that can accommodate higher level of UV Absorbers but only into high viscosity systems that are not sprayable.

As a result of this work, stable low viscosity emulsions containing high level of UV Absorbers were developed thanks to a unique combination of 2 silicone polyether emulsifiers (PEG-12 Dimethicone; XIAMETER OFX-5329 Fluid and Lauryl PEG/PPG-18/18 Methicone; Dow Corning® 5200 Formulation Aid), silicone fluids (Carprylyl Methicone;Dow Corning® FZ-3196 and Phenyltrimethicone; Dow Corning® 556 Cosmetic Grade Fluid) and Ethanol. The resulting emulsions had very good stability and sensory feel. The addition of an anionic surfactant such as Trilaureth-4 Phosphate and a small amount of a water thickening agent was found to further improve formulation stability. The sensory feel was improved further  by the addition of Bis-PEG-18 Methyl Ether Dimethyl Silane (Dow Corning® 2501 Cosmetic Wax) , a water soluble silicone wax helping to reduce the tacky and greasy feel and the film residue perception.

Materials:

Trade names

INCI Name

Dow Corning ® 5200 Formulation Aid

Lauryl PEG/PPG-18/18 Methicone

XIAMETER OFX 5329 Fluid

PEG-12 Dimethicone.

Dow Corning ® 556 Cosmetic Fluid

Phen...