Treated Polyester Backings for Shelling-Resistant Abrasive Coatings

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Solution Overview

Problem

Coated abrasive articles experience shelling, where the abrasive layer partially separates from the backing, leading to performance loss, despite existing tie layers that can adversely affect the cure of adjacent layers.

Innovation Solution

A tie layer comprising a blend of styrene-butadiene copolymer latex and resorcinol-formaldehyde resin is used, providing improved adhesion and reducing shelling by ensuring proper curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a conventional tie layer is used to prevent shelling, then adhesion between abrasive layer and backing is improved, but the basic groups in the tie layer adversely affect the cure of adjacent cationically cured layers, resulting in poor adhesion

Engineering Contradiction:

Improveadhesion between abrasive layer and backingVSAvoidcure quality of adjacent layers

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the chemical parameter of the tie layer from basic to acidic by selecting acrylic acid or methacrylic acid as the monomer. This parameter change resolves the contradiction because acidic groups do not interfere with the cationic curing mechanism of adjacent layers, allowing proper curing while maintaining adhesion function.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite tie layer material combining acrylic or methacrylic acid monomer with specific molecular weight and carboxyl content. This composite material provides both the adhesion function and chemical compatibility with cationically cured layers, simultaneously addressing both requirements of the contradiction.

Inventive Principle:

Principle #40Composite materials

2Strength

If the tie layer contains basic groups to enhance adhesion, then bonding between layers is improved, but the cure of cationically cured layers adjacent to the tie layer is adversely affected

Engineering Contradiction:

Improvebonding strength of tie layerVSAvoidcuring process compatibility

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a tie layer is added to prevent shelling, then adhesion is improved, but the complexity of the coating structure increases

Engineering Contradiction:

Improveresistance to shellingVSAvoidcoating structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent optimizes the molecular weight parameter of the acrylic or methacrylic acid monomer to be in the range of 50-500. This parameter optimization allows the tie layer to achieve effective adhesion and shelling resistance while maintaining a relatively simple coating structure, thus resolving the contradiction between reliability and complexity.

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 tie layer effectively secures the abrasive layer to the backing, enhancing the durability and performance of coated abrasive articles by minimizing shelling.

Implementation Method 1

the tie layer comprises an at least partially cured blend of, on a solids basis, from 50 to 99 parts by weight of at least one styrene-butadiene copolymer latex and from 1 to 50 parts by weight of at least one resorcinol-formaldehyde resin

Methodology Applied

Scientific EffectCuring:

Data Source

PatentUS12459081B2Treated backing and coated abrasive article including the same

Publication Date: 2025.11.04 3M INNOVATIVE PROPERTIES CO

AI summary

A coated abrasive article (100) comprises: a backing (110) comprising polyester and having a major surface (115); a tie layer (120) directly bound to at least a portion of the major surface (115); and an abrasive layer (130) directly bound to at least a portion of the tie layer (120), the abrasive layer (130) comprising abrasive particles (160) and at least one binder resin (140). The tie layer (120) comprises an at least partially cured blend of, on a solids basis, from 50 to 99 parts by weight of at least one styrene-butadiene copolymer latex and from 1 to 50 parts by weight of at least one resorcinol-formaldehyde resin. A treated backing (110) comprising polyester having the preceding tie layer (120) directly bound thereto is also disclosed.