Lipstick Composition Phase Separation Transfer Resistance

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Solution Overview

Problem

Conventional lip cosmetics suffer from secondary adhesion, insufficient gloss durability, and stability issues, with existing solutions either taking time to exhibit secondary adhesion resistance or causing dryness and filminess.

Innovation Solution

A solid cosmetic composition comprising hydrogenated polyisobutene, methyl phenyl silicones, specific oils, and wax, which separates into distinct layers upon application, providing immediate secondary adhesion resistance and gloss durability while maintaining stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional transfer-resistant cosmetic compositions are used, then secondary adhesion resistance is improved, but stability and gloss are insufficient

Engineering Contradiction:

Improvesecondary adhesion resistanceVSAvoidstability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical parameters of the oil components by specifying precise solubility parameter ranges (5.0-9.0 for non-volatile hydrocarbon oil, 18.0-22.0 for volatile hydrocarbon oil) and compatibility relationships with silicone compounds. This parameter optimization resolves the contradiction by achieving both transfer resistance and stability through scientifically controlled compositional parameters rather than arbitrary formulations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining volatile hydrocarbon oil, non-volatile hydrocarbon oil, and non-volatile silicone compound in specific compatibility relationships. This composite approach allows the system to exhibit both transfer-resistant properties and enhanced stability, as the synergistic interaction between components compensates for individual limitations.

Inventive Principle:

Principle #40Composite materials

2Reliability

If transfer-resistant cosmetic composition is applied, then secondary adhesion resistance is achieved, but gloss durability is insufficient

Engineering Contradiction:

Improvesecondary adhesion resistanceVSAvoidgloss durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent optimizes the solubility parameters and compatibility relationships of the oil components to control their separation behavior and film formation characteristics. By precisely adjusting these parameters, the composition achieves both immediate transfer resistance and sustained gloss durability, resolving the temporal contradiction between adhesion resistance onset and gloss maintenance.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If lipstick composition with volatile oil component is used, then transfer resistance is achieved, but container restrictions apply

Engineering Contradiction:

Improvetransfer resistanceVSAvoidcontainer compatibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent specifies precise solubility parameter ranges for volatile hydrocarbon oils (18.0-22.0) and controls their compatibility relationships with silicone compounds. This parameter control allows the formulation to maintain transfer-resistant properties while reducing volatility-related container issues, expanding container compatibility options.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If stick cosmetic with large proportion of volatile oil is used, then transfer resistance is achieved, but matte finish provides feeling of dryness

Engineering Contradiction:

Improvetransfer resistanceVSAvoidfeeling of dryness

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent balances the solubility parameters of volatile and non-volatile oil components, controlling their separation behavior to achieve transfer resistance while maintaining appropriate moisture content. The specified parameter ranges prevent excessive matte finish and associated dryness sensation, resolving the contradiction between transfer resistance and comfort.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition achieves excellent secondary adhesion resistance, gloss durability, and stability by ensuring immediate separation and adherence of components, preventing transfer and maintaining a smooth, glossy finish.

Implementation Method 1

methyl phenyl silicones that separate from (a) when mixed therewith at 25°C

Methodology Applied

Scientific EffectPhase separation: Phase Change

Implementation Method 2

oil that separates from both (a) and (b) when mixed therewith at 25°C

Methodology Applied

Scientific EffectPhase separation: Phase Change

Implementation Method 3

a volatile hydrocarbon solvent; a non-volatile silicone compound that can be dissolved or dispersed in the volatile hydrocarbon solvent

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentEP2716277B1Solid cosmetic for lips

Publication Date: 2016.02.10 SHISEIDO CO LTD

Figure 1(A)~1(C)
Figure 2

AI summary

The present invention provides a solid cosmetic for lips that has excellent secondary adhesion resistance effect, excellent feeling in use, gloss durability, and excellent stability. The solid cosmetic for lips of the present invention is characterized by comprising the following (a) to (d): (a) 5 to 30 mass % of hydrogenated polyisobutene, (b) 30 to 70 mass % of one or more kinds of methyl phenyl silicones that separate from (a) when mixed therewith at 25 °C, (c) 0.5 to 15 mass % of oil that separates from both (a) and (b) when mixed therewith at 25 °C, and (d) 4 to 12 mass % of wax.