PVC-to-Fabric Bonding Composition for Phthalate-Free Plastisols

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Solution Overview

Problem

Commercially available bonding agents for PVC coatings show poor compatibility with ortho-phthalate-free PVC plastisols, leading to short pot life and inadequate adhesion to synthetic fabrics, necessitating a solution that improves compatibility and adhesion while avoiding adverse health effects associated with traditional plasticizers.

Innovation Solution

A bonding composition comprising isocyanurate and organophosphate at a specific weight ratio, combined with a plastisol containing dioctyl terephthalate or 1,2-cyclohexane dicarboxylic acid diisononyl ester, enhances compatibility and adhesion of PVC to synthetic fabrics, addressing the limitations of traditional ortho-phthalate-based systems.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If ortho-phthalate plasticizers are used in bonding agents, then compatibility with PVC plastisol is improved, but health safety deteriorates due to adverse health effects of phthalates

Engineering Contradiction:

ImprovecompatibilityVSAvoidhealth safety

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameter of the plasticizer from ortho-phthalate to meta-phthalate (specifically DOTP - dioctyl terephthalate). This parameter change maintains the desired compatibility and adhesion properties while eliminating the harmful health effects associated with ortho-phthalate plasticizers.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the traditional ortho-phthalate plasticizer with a meta-phthalate alternative that serves the same functional purpose but without the harmful side effects, effectively substituting a harmful material with a safer equivalent that achieves the same technical goals.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Object-affected harmful factors

If ortho-phthalate-free plastisols are used, then health safety is improved, but compatibility with bonding agents deteriorates leading to short pot life and gelation

Engineering Contradiction:

Improvehealth safetyVSAvoidcompatibility

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent changes the plasticizer parameter from ortho-phthalate to meta-phthalate (DOTP) in the bonding agent formulation. This parameter change resolves the compatibility issue with ortho-phthalate-free plastisols while maintaining the health safety benefits of avoiding traditional phthalates.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The meta-phthalate plasticizer (DOTP) acts as an intermediary substance that bridges the compatibility gap between ortho-phthalate-free plastisols and bonding agents, enabling them to work together effectively without the harmful effects of traditional plasticizers.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If bonding agents are used with ortho-phthalate-free plastisols, then health safety is improved, but adhesion to synthetic fabric deteriorates

Engineering Contradiction:

Improvehealth safetyVSAvoidadhesion

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent changes the plasticizer type parameter to meta-phthalate (DOTP) and optimizes the bonding agent formulation to work specifically with ortho-phthalate-free plastisols. This parameter change maintains health safety while achieving adequate adhesion to synthetic fabrics that was previously compromised.

Inventive Principle:

Principle #35Parameter changes

4Object-affected harmful factors

If bonding agents show poor compatibility with ortho-phthalate-free plastisols, then health safety is improved, but pot life deteriorates due to rapidly increasing viscosity and gelation

Engineering Contradiction:

Improvehealth safetyVSAvoidpot life

Core Design Contradiction:

Object-affected harmful factorsVSDuration of action of moving object

Solution Approach 1:

The patent changes the chemical composition parameter of the bonding agent by using meta-phthalate plasticizer (DOTP) instead of ortho-phthalate, and optimizes the formulation to prevent rapid gelation. This extends the pot life of ortho-phthalate-free plastisol systems while maintaining health safety benefits.

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 proposed solution significantly improves the compatibility and adhesion of PVC coatings to synthetic fabrics, maintaining stable viscosity and enhancing peel strength, even with ortho-phthalate-free plastisols, thereby overcoming the limitations of existing bonding agents.

Implementation Method 1

The bonding agent chemically bonds with the reactive groups of the fabric and allows the PVC coating to adhere to the fabric

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Implementation Method 2

a plastisol comprising polyvinyl chloride powder dispersed in a plasticizer

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Data Source

PatentEP3262231B1Bonding agents for plastisols containing DOTP or dinch

Publication Date: 2019.03.20 EASTMAN CHEM CO

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AI summary

A bonding composition for adhering PVC to fabric is disclosed. The bonding composition contains isocyanurate and organophosphate at an organophosphate to isocyanurate weight ratio of 4:1 to 10:1.