Polyester Polyalkylpiperidine Stabilizers for Polyolefins

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Solution Overview

Problem

Current polymer stabilizers, such as benzophenone and benzotriazole derivatives, provide insufficient protection against oxidative action and photodegradation, particularly in polyolefin fibers, films, and raffia, necessitating the development of more effective light stabilizers.

Innovation Solution

The use of novel polyester polymer compounds with polyalkylpiperidine units as pendants on the polymer chain, obtained through polycondensation reactions, which are more mobile and effective in stabilizing polymers against radiation and oxidative degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If polyalkylpiperidine groups are incorporated into the polymer chain, then stabilizing efficacy is improved, but the active groups become blocked and mobility is reduced

Engineering Contradiction:

Improvestabilizing efficacyVSAvoidgroup mobility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The polyalkylpiperidine stabilizing groups are segmented from the main polymer chain and attached as pendant side chains. This segmentation allows the active stabilizing groups to maintain mobility while being part of the polymer structure, resolving the contradiction between incorporating stabilizing groups and maintaining their activity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stabilizing groups are moved from a two-dimensional chain structure to a three-dimensional pendant configuration extending from the chain. This dimensional change provides spatial freedom for the active groups to move and perform stabilizing functions while remaining attached to the polymer.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If traditional stabilizers like benzophenone and benzotriazole derivatives are used, then polymer stability is provided, but the protection against oxidative action and photodegradation is insufficient

Engineering Contradiction:

Improvepolymer stabilityVSAvoidprotection efficacy

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The invention creates a composite structure where polyalkylpiperidine units are integrated into the polyester polymer chain as pendant groups. This composite approach combines the structural benefits of polyester with the superior light stabilizing and antioxidant properties of polyalkylpiperidine, achieving both composition stability and high protection efficacy.

Inventive Principle:

Principle #40Composite materials

3Reliability

If polyalkylpiperidine units are part of the polymer chain, then stabilizing action is enhanced, but the active groups are blocked and mobility is restricted

Engineering Contradiction:

Improvestabilizing actionVSAvoidgroup activity duration

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The pendant polyalkylpiperidine groups are designed to be dynamic and mobile rather than fixed rigidly to the chain. This dynamic configuration allows the active groups to move freely along the polymer chain and between chains, maintaining prolonged stabilizing activity and resolving the contradiction between enhancing stabilizing action and ensuring group mobility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3424977B1Hindered polymeric amines

Publication Date: 2020.03.18 3V SIGMA

AI summary

Disclosed are polymer compounds wherein the main polymer chain is a polyester and the pendants are polyalkylpiperidine. The compounds of the invention, either alone or mixed with other known agents, are useful as stabilisers of polymers, especially polyolefins.