Halogen Vinyl Polymer Stabilizer Composition

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Solution Overview

Problem

Existing stabilizer compositions for halogen-containing vinyl polymers are inadequate in preventing degradation and discoloration during processing and long-term use, as they do not provide sufficient protection against color changes.

Innovation Solution

A stabilizer composition comprising a mercaptoester, a reverse mercaptoester, and a Lewis acid, such as boron trifluoride or zinc chloride, which synergistically enhances the stabilization of halogen-containing vinyl polymers by forming a synergistic combination that improves thermal stability and color retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing stabilizer compositions (mercaptoester and zinc compound or metal halide) are used, then the polymer shows some stabilization, but the protection against degradation and discoloration is insufficient

Engineering Contradiction:

Improvestabilization effectivenessVSAvoiddegradation and discoloration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent combines three stabilizing components (mercaptoester, reverse mercaptoester, and Lewis acid) into a single stabilizer composition that works synergistically. This merging of multiple stabilizing mechanisms provides superior protection against degradation and discoloration compared to binary combinations, directly resolving the insufficient stabilization effectiveness of existing compositions

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite stabilizer system comprising mercaptoester, reverse mercaptoester, and Lewis acid components that work together synergistically. This composite approach combines different stabilizing mechanisms (radical scavenging, chelation, acid-base neutralization) to achieve enhanced reliability and protection against multiple degradation pathways simultaneously

Inventive Principle:

Principle #40Composite materials

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 combination of mercaptoester, reverse mercaptoester, and Lewis acid significantly improves the thermal stability and color retention of halogen-containing vinyl polymers, outperforming previous compositions that used only mercaptoester and zinc compounds or metal halides, by providing enhanced protection against degradation and discoloration.

Implementation Method 1

The combination of a mercaptoester and a reverse mercaptoester with a Lewis acid provides unexpected synergy compared to a mercaptoester and a Lewis acid alone

Methodology Applied

Scientific EffectSynergistic stabilization:

Data Source

PatentUS7531587B2Thermal stabilizer composition for halogen-containing vinyl polymers

Publication Date: 2009.05.12 ROHM & HAAS CO

AI summary

Stabilizer compositions are used to stabilize halogen-containing vinyl polymers from, for example, degradation and discoloration. The stabilizer compositions comprise a mercaptoester, a reverse mercaptoester, and a Lewis acid.