Polyolefin Composition with Silane Groups and Titanium Dioxide Pigment

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Solution Overview

Problem

Titanium dioxide containing compositions deactivate the crosslinking ability of Brönstedt acid silanol condensation catalysts, making them incompatible with polyolefin crosslinking technologies.

Innovation Solution

A polyolefin composition comprising a crosslinkable polyolefin with hydrolysable silane groups, a Brönstedt acid silanol condensation catalyst, and a specific titanium dioxide containing composition that maintains high crosslinking performance, characterized by a torque difference of 40 Nm or higher at 120°C, with uncoated titanium dioxide concentrations of at least 93 wt% and coated titanium dioxide concentrations of at least 97 wt%, and particle sizes between 0.10 μm and 0.25 μm.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If titanium dioxide containing compositions are used in polyolefin compositions with Brönstedt acid silanol condensation catalyst, then the colour coverage and opacity of the article is improved, but the crosslinking ability of the catalyst is deactivated

Engineering Contradiction:

Improvecolour coverage and opacityVSAvoidcrosslinking ability of catalyst

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent changes the physical and chemical parameters of the titanium dioxide composition, specifically controlling particle size (0.1-10 μm), purity (≥93 wt%), and coating characteristics to prevent catalyst deactivation while maintaining optical properties

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite system by carefully selecting and combining specific types of titanium dioxide particles with the polyolefin matrix and catalyst, where the composite composition achieves both good color coverage and catalyst compatibility

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional tin-organic catalysts are used for crosslinking, then the crosslinking process is reliable, but the crosslinking speed is slow and requires elevated temperatures

Engineering Contradiction:

Improvecrosslinking process reliabilityVSAvoidcrosslinking speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent changes the chemical parameter of the catalyst by selecting Brönstedt acids with specific acidities and molecular structures, which fundamentally alters the reaction kinetics to achieve fast crosslinking at room temperature

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the conventional tin-organic catalyst system with a Brönstedt acid catalyst system, replacing the mechanism of action to achieve different performance characteristics (faster speed, lower temperature requirement)

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Illumination intensity

If uncoated titanium dioxide with high concentration is used, then the colour coverage is improved, but the compatibility with Brönstedt acid catalyst is worsened

Engineering Contradiction:

Improvecolour coverageVSAvoidcompatibility with catalyst

Core Design Contradiction:

Illumination intensityVSAdaptability or versatility

Solution Approach 1:

The patent precisely controls the particle size parameter of titanium dioxide (0.1-10 μm range) and purity parameter (≥93 wt%) to achieve an optimal balance where high color coverage is maintained while catalyst compatibility is preserved

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 composition retains high crosslinking performance, as measured by torque difference, even with titanium dioxide containing compositions, ensuring compatibility and effective crosslinking without deactivating the Brönstedt acid catalyst.

Implementation Method 1

cross-linking may be performed by condensation of silanol groups contained in the polyolefin which can be obtained by hydrolysation of silane groups

Methodology Applied

Scientific EffectHydrolysis: Hydrolysis

Implementation Method 2

cross-linking may be performed by condensation of silanol groups contained in the polyolefin

Methodology Applied

Scientific EffectCondensation: Condensation

Implementation Method 3

the cross-linking process advantageously is carried out in the presence of acidic silanol condensation catalysts. In contrast to the conventional tin-organic catalysts the acidic catalysts allow cross-linking to quickly take place already at room temperature

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS8268924B2Polyolefin composition comprising crosslinkable polyolefin with silane groups, silanol condensation catalyst and pigment

Publication Date: 2012.09.18 BOREALIS TECH OY

AI summary

The present invention is directed to particular titanium dioxide containing compositions which allow the retention of a high crosslinking performance of a polyolefin composition comprising a crosslinkable polyolefin with hydrolysable silane groups, a Brönstedt acid silanol condensation catalyst and said titanium dioxide containing composition. The retention of the high crosslinking performance is shown by a difference in torque measured at 120° C. of 40 Nm or higher.