Polyaspartic Clearcoat with Polyol-Modified Isocyanate

Solution Overview

Problem

The coating industry faces challenges in achieving improved scratch resistance for clearcoat coatings, particularly in refinishing applications, where existing aspartate-based clearcoat compositions often compromise on scratch resistance despite fast cure rates and good appearance.

Innovation Solution

A clearcoat composition comprising a binder portion with a polyaspartic ester resin and an activator portion with a polyol-modified isocyanate, formed by reacting a polyisocyanate and polyol components, including polycaprolactone polyol, to achieve a specific isocyanate index, which enhances scratch resistance while maintaining fast cure rates and aesthetic appeal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional aspartate-based clearcoat compositions are used, then fast cure rates and good appearance are achieved, but scratch resistance is compromised

Engineering Contradiction:

Improvescratch resistanceVSAvoidcure rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent uses a composite activator system combining polyol-modified isocyanate with additional polyol and catalyst components. This multi-component activator formulation creates a complex chemical system that maintains the fast cure characteristics of aspartate chemistry while introducing polyol structures that enhance scratch resistance through improved polymer network architecture and flexibility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical parameters of the isocyanate component by incorporating polyol-modified isocyanate with specific NCO functionality and molecular weight characteristics. This parameter modification allows tuning of the curing reaction kinetics and final coating properties, achieving both fast cure and improved scratch resistance simultaneously.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If conventional aspartate-based clearcoat compositions are used, then fast cure rates and good appearance are achieved, but scratch resistance is compromised

Engineering Contradiction:

Improvescratch resistanceVSAvoidcure time

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent uses a composite activator system combining polyol-modified isocyanate with additional polyol and catalyst components. This multi-component activator formulation creates a complex chemical system that maintains the fast cure characteristics of aspartate chemistry while introducing polyol structures that enhance scratch resistance through improved polymer network architecture and flexibility.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical parameters of the isocyanate component by incorporating polyol-modified isocyanate with specific NCO functionality and molecular weight characteristics. This parameter modification allows tuning of the curing reaction kinetics and final coating properties, achieving both fast cure and improved scratch resistance simultaneously.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If polyol component is added to modify isocyanate, then scratch resistance is improved, but formulation complexity increases

Engineering Contradiction:

Improvescratch resistanceVSAvoidformulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the activator function with the scratch resistance enhancement function by incorporating polyol-modified isocyanate that serves dual purposes: activating the aspartate resin and providing scratch resistance through polyol structures. This consolidation reduces the need for separate additive packages.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The polyol-modified isocyanate component performs multiple functions simultaneously: it acts as the activator for the aspartate chemistry, provides the polyol structures necessary for scratch resistance, and contributes to the overall polymer network formation. This multi-functionality simplifies the overall formulation architecture.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 described clearcoat composition demonstrates improved scratch resistance and gloss retention, as evidenced by testing, with enhanced recovery performance and retention of desirable properties post-scratch, effectively addressing the industry's need for durable and efficient clearcoat solutions.

Implementation Method 1

a polyol-modified isocyanate that is a reaction product of a polyisocyanate component and a polyol component

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 2

resins that contain hydroxyl or amine functional groups to react with isocyanates

Methodology Applied

Scientific EffectIsocyanate-amine reaction: Chemical Bonding

Implementation Method 3

covalent bonds form between the resin components, thereby producing a cross-linked polymer network

Methodology Applied

Scientific EffectCross-linking: Chemical Bonding

Data Source

PatentUS11492440B2Clearcoat compositions and methods of forming clearcoat compositions

Publication Date: 2022.11.08 AXALTA COATING SYSTEMS IP CO LLC

AI summary

Clearcoat compositions and methods for forming a clearcoat compositions are provided. In one example, a clearcoat composition includes a binder portion A that includes a polyaspartic ester resin. An activator portion B includes a polyol-modified isocyanate that is a reaction product of a polyisocyanate component and a polyol component. The polyol component includes polycaprolactone polyol.