Universal Solvent Cement for PVC CPVC ABS Bonding

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Solution Overview

Problem

Current solvent cements are specific to particular types of plastic, such as PVC, CPVC, or ABS, requiring separate stocks for each, limiting their practical application and increasing inventory needs.

Innovation Solution

A universal solvent cement composed of a minor amount of acrylic resin and one or more solvents capable of dissolving PVC, CPVC, and ABS, with the acrylic resin constituting at least 75 wt. % of the dissolved thermoplastic resin, allowing for bonding across all three types of plastics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate solvent cements are used for PVC, CPVC, and ABS, then bonding effectiveness for each specific plastic is improved, but inventory complexity and stock requirements increase

Engineering Contradiction:

Improvebonding effectivenessVSAvoidinventory complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a universal solvent cement that can effectively bond all three plastic types (PVC, CPVC, and ABS) with a single formulation. This is achieved by selecting a solvent system that dissolves the surfaces of all three plastics and incorporating an acrylic resin that provides adhesive compatibility across different plastic substrates, thereby eliminating the need for multiple specialized cements and reducing inventory complexity while maintaining bonding effectiveness

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a universal solvent cement is developed, then inventory requirements and application versatility are improved, but bonding effectiveness for specific plastics may deteriorate

Engineering Contradiction:

Improveapplication versatilityVSAvoidbonding effectiveness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent optimizes the chemical parameters of the solvent cement formulation, specifically selecting solvents with appropriate solvency characteristics that can dissolve the surfaces of PVC, CPVC, and ABS plastics. The acrylic resin content and molecular weight are carefully controlled to ensure adequate adhesive properties across different plastic types, thereby achieving universal applicability without sacrificing bonding effectiveness for any specific plastic

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

Enables effective bonding between PVC, CPVC, and ABS plastics using a single solvent cement, reducing inventory requirements and ensuring compatibility across different plastic types, while maintaining excellent adhesive properties.

Implementation Method 1

one or more solvents capable of dissolving the acrylic resin and further capable of dissolving at least the surfaces of PVC, CPVC and ABS molded articles

Methodology Applied

Scientific EffectDissolution: Solvation

Data Source

PatentUS7592385B2Universal solvent cement

Publication Date: 2009.09.22 OATEY CO

AI summary

A solvent cement for bonding PVC, CPVC and ABS plastic pipe and other molded articles comprises a minor amount of an acrylic resin and one or more solvents capable of dissolving the acrylic resin and further capable of dissolving at least the surfaces of PVC, CPVC and ABS molded articles, wherein the acrylic resin constitutes at least 75 wt. % of the dissolved thermoplastic resin in the cement.