Polyolefin Stabilization with Benzofuranones and HALS

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Solution Overview

Problem

There is a growing demand for polyolefin articles with lower color and improved color maintenance, as traditional phenolic/phosphite antioxidant blends do not adequately address the need for reduced color and enhanced thermal stability during melt processing.

Innovation Solution

The use of polyolefin compositions comprising phosphorus-containing 3-phenyl-benzofuran-2-one compounds in combination with hindered amine light stabilizers (HALS) to stabilize polyolefins against heat, light, and oxygen-induced color degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional phenolic/phosphite antioxidant blends are used, then melt flow control is maintained, but color performance deteriorates

Engineering Contradiction:

Improvemelt flow controlVSAvoidcolor performance

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The patent changes the chemical parameters of the antioxidant system by replacing traditional phenolic/phosphite blends with phosphorus-containing benzofuranone compounds. This parameter change maintains melt flow control while significantly improving color performance, resolving the contradiction between ease of operation and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite stabilization system combining phosphorus-containing benzofuranone compounds with hindered amine light stabilizers (HALS). This composite approach synergistically maintains melt flow control while providing superior color performance, addressing both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If traditional phenolic/phosphite antioxidant blends are used, then processing experience is maintained, but thermal stability deteriorates

Engineering Contradiction:

Improveprocessing experienceVSAvoidthermal stability

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent changes the thermal stability parameters by introducing phosphorus-containing benzofuranone compounds with enhanced thermal resistance properties. This maintains compatibility with existing processing experiences while significantly improving thermal stability during melt processing.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If stabilization against heat, light and oxygen is enhanced, then color maintenance improves, but additive complexity increases

Engineering Contradiction:

Improvecolor maintenanceVSAvoidadditive complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The phosphorus-containing benzofuranone compounds serve multiple functions simultaneously: they act as antioxidants, process stabilizers, and color protectors. This multi-functionality reduces the need for separate additives while maintaining excellent color maintenance, resolving the contradiction between reliability and device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent creates a synergistic composite system where phosphorus-containing benzofuranone compounds work together with hindered amine light stabilizers. This composite approach provides comprehensive protection against heat, light, and oxygen degradation while maintaining a manageable additive system.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS11623979B2Stabilized polyolefin compositions comprising benzofuranones and hindered amine light stabilizers

Publication Date: 2023.04.11 BASF SCHWEIZ AG

AI summary

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus—containing benzofuranone compounds and iii) one or more hindered amine light stabilizers are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.