Capped Oligomer Nail Coatings for Solvent Removability

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Solution Overview

Problem

Current nail coatings with uncapped oligomers require careful formulation and stabilization to prevent side reactions and UV-light induced cross-linking, and are difficult to remove without damaging the nail.

Innovation Solution

The use of capped oligomers, such as Bis-Ethylhexanol Poly (1,4-Butanediol)-13/IPDI Copolymer and Bis-Ethylhexanol Poly(Caprolactone Neopentyl Glycol)/IPDI Copolymer, in combination with solvents and film formers, to create a durable scratch-resistant nail coating that does not require UV-light cross-linking, allowing for improved adhesion and solvent removability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If uncapped oligomers are used in photo-reactive coatings to achieve durable scratch-resistant coating, then adhesion and durability are improved, but the formulation becomes complex and requires UV-light induced cross-linking which complicates the manufacturing process

Engineering Contradiction:

ImprovedurabilityVSAvoidformulation complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent extracts the reactive unsaturated sites from the oligomer structure by capping them with hydroxyl groups, eliminating the need for UV-light induced cross-linking and complex photoinitiator systems while maintaining the durable, scratch-resistant properties of the coating

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical parameter of the oligomer by converting unsaturated sites to capped hydroxyl groups, transforming the material from requiring photo-crosslinking to forming stable coatings through evaporation and oxidation mechanisms

Inventive Principle:

Principle #35Parameter changes

2Reliability

If uncapped oligomers with unsaturated sites are used to provide cross-linking durability, then adhesion is improved, but side reactions and pre-polymerization occur requiring careful stabilization

Engineering Contradiction:

ImproveadhesionVSAvoidformulation stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent removes the problematic unsaturated sites that cause side reactions and pre-polymerization by capping them with hydroxyl groups, eliminating the need for stabilization while preserving adhesion through the capped oligomer structure

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the potentially harmful unsaturated sites into beneficial capped hydroxyl groups that provide both adhesion and formulation stability, transforming a liability into an asset

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Strength

If UV-light induced cross-linking is used to create durable coating, then scratch resistance is improved, but the coating becomes difficult to remove without damaging the nail

Engineering Contradiction:

Improvescratch resistanceVSAvoidremovability

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent removes the permanent cross-linked network formed by UV curing and replaces it with a capped oligomer structure that achieves scratch resistance through molecular design rather than cross-linking, enabling easy removal with standard solvents

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of using cross-linking to achieve durability (which makes removal difficult), the patent inverts the approach by using capped oligomers with inherent durability that are easily removable, reversing the traditional relationship between durability and removability

Inventive Principle:

Principle #13The other way round (Inversion)

4Device complexity

If capped oligomers are used to eliminate UV-cross-linking requirements, then formulation complexity is reduced, but achieving equivalent durability and scratch resistance becomes challenging

Engineering Contradiction:

Improveformulation simplicityVSAvoidscratch resistance

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The patent achieves scratch resistance without cross-linking by changing the molecular parameters of the oligomer - using specific cap structures and molecular weights that provide durability through physical properties rather than chemical cross-linking

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 capped oligomer compositions provide a controlled mechanism for a durable scratch-resistant nail coating with enhanced adhesion and solvent sensitivity, making them easier to remove without damaging the nail, while maintaining flexibility and hardness.

Implementation Method 1

a composition composed of at least one capped oligomer, at least one solvent, at least one film former

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

provide improved adhesion, durability/toughness, and scratch resistance

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS10632060B2Nail composition with capped oligomers

Publication Date: 2020.04.28 REVLON CONSUMER PRODUCTS LLC

AI summary

The present disclosure relates generally to a composition comprising at least one capped oligomer, at least one solvent, at least one film former, and at least one monomer or polymer, said composition having a sward hardness <10 and >1 when applied to a glass plate.