Sunscreen Staining Reduction via Piroctone Complexation

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Solution Overview

Problem

Existing sunscreen preparations containing non-water-soluble UV-A filters like (2-[-4-(Diethylamino)-2-hydroxybenzoyl] benzoic acid hexyl ester cause stubborn stains on light-colored textiles and are difficult to wash out, leading to discoloration.

Innovation Solution

A cosmetic preparation combining (2-[-4-(Diethylamino)-2-hydroxybenzoyl] benzoic acid hexyl ester with 1-hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1H)-pyridone, preferably in the form of its monoethanolamine salt, to enhance washability, along with other UV filters and emulsifiers, forming an alcoholic spray, gel, or emulsion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If non-water-soluble UV-A filters such as diethylamino hydroxybenzoyl hexyl benzoate are used in sunscreen preparations, then UV protection efficacy is improved, but staining of textiles and difficulty of washout occur

Engineering Contradiction:

ImproveUV protection efficacyVSAvoidtextile staining

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces piroctone and its monoethanolamine salt as intermediary substances that complex with diethylamino hydroxybenzoyl hexyl benzoate. This complexation modifies the UV filter's properties, reducing its affinity for textile fibers while maintaining UV protection. The intermediary substance acts as a bridge that allows the UV filter to perform its function without causing harmful staining effects on textiles.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical state of the UV filter by forming a complex with piroctone. This parameter change affects the solubility and binding characteristics of the UV filter, making it more water-soluble and less prone to adhere to textile fibers. The complexation alters physical-chemical parameters such as polarity and molecular structure, thereby reducing staining while preserving UV absorption capabilities.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If non-water-soluble UV-A filters are used in sunscreen preparations, then UV protection is enhanced, but the preparation becomes difficult to wash out of textiles

Engineering Contradiction:

ImproveUV protectionVSAvoidwashability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

Piroctone and its monoethanolamine salt serve as mediators that improve washability by complexing with the UV filter. This complexation increases water solubility and reduces fiber affinity, allowing easier removal during washing while maintaining UV protection during wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite system where piroctone and the UV filter work together as a combined active ingredient system. This composite approach allows the mixture to exhibit both UV protection properties and improved washability, overcoming the limitations of using the UV filter alone.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3150189B1Sunscreen with reduced textile staining due to diethylamino hydroxybenzoyl hexyl benzoate

Publication Date: 2021.11.10 BEIERSDORF AG

AI summary

Cosmetic preparation containing (2-[-4-(Diethylamino)-2-hydroxybenzoyl] Benzoic acid hexyl ester (INCI: Diethylamino Hydroxybenzoyl Hexyl Benzoate) and 1-Hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2(1 H)-pyridone (Piroctone).