Co-additive Clarifier Compositions for Polymer Haze Reduction
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Solution Overview
Problem
Existing clarifying agents, such as those based on diacetals of sorbitol and xylitol, are less effective at low loadings, leading to increased costs and potential issues like plate out or blooming, and there is a need for a method to improve their clarifying function at lower concentrations.
Innovation Solution
The use of specific co-additives, including poly(ethylene glycol) and polycaprolactone triol, is employed to decrease the critical concentration of clarifiers, allowing for improved haze reduction at lower loadings, with co-additives like PEG 3400 and polycaprolactone triol being effective in reducing the critical concentration of MILLAD® 3988 clarifying agent by nearly half.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If clarifier loading is reduced to decrease cost and avoid plate out, blooming, or extraction, then economic benefits improve, but clarifying function deteriorates
Solution Approach 1:
The patent introduces a co-additive as an intermediary substance that works synergistically with the clarifier to enhance its performance at low concentrations. The co-additive mediates between the clarifier molecules and the polymer matrix, improving dispersion and optical properties without requiring high clarifier loadings. This resolves the contradiction by enabling effective clarification with reduced clarifier content through the mediating action of the co-additive.
Solution Approach 2:
The patent creates a composite system combining the clarifier, co-additive, and polymer matrix. This composite approach allows the synergistic interaction between clarifier and co-additive to produce enhanced clarifying effects at low concentrations. The composite material structure enables the system to achieve better optical properties than the clarifier alone could provide at equivalent loadings, thus resolving the contradiction between low loading and effective clarifying function.
2Manufacturing precision
If clarifier loading is increased to improve haze reduction, then optical properties improve, but cost increases and plate out, blooming, or extraction occurs
Solution Approach 1:
The co-additive acts as an intermediary that enhances the efficiency of the clarifier, allowing achieving the same haze reduction at lower clarifier concentrations. The co-additive improves the interaction between clarifier and polymer, maximizing the clarifying effect per unit of clarifier, thus reducing the total clarifier loading needed while maintaining optical quality.
Solution Approach 2:
The patent changes the compositional parameters of the system by introducing the co-additive, which alters the physical and chemical environment for the clarifier. This parameter change enables the clarifier to work more effectively at lower concentrations, achieving the desired haze reduction with reduced clarifier loading and avoiding the adverse effects of high concentrations.
3Reliability
If co-additive is added to improve low level efficacy of clarifier, then clarifying function at low loading improves, but device complexity increases
Solution Approach 1:
The co-additive serves as a simple intermediary component that bridges the gap between low clarifier concentrations and effective clarifying performance. By adding this single co-additive component, the system achieves enhanced low-level efficacy without requiring complex multi-component formulations or processing modifications, thus minimizing the increase in overall system complexity.
Solution Approach 2:
The co-additive performs multiple functions simultaneously: it enhances clarifier dispersion, improves optical properties, enables low-concentration effectiveness, and prevents the adverse effects of high loading. This multi-functionality means that adding a single co-additive component provides comprehensive benefits without requiring multiple separate additives or complex formulation adjustments.
Data Source
AI summary
It is possible to improve significantly the optical performance of diacetal or DBS-based nucleating or clarifying agents using a co-additive. Haze is a measure of the lack of clarity in a thermoplastic or plastic material. A low level of haze is usually quite desirable, and nucleating/clarifying agents are designed to reduce the degree of haze in a plastic or thermoplastic material. A co-additive may be used in connection with a nucleating/clarifying agents in a polymer or copolymer to achieve even greater results in terms of improved clarity (reduced haze), or in terms of a higher crystallization temperature (Tc) of the polymer. A method for reducing haze in polymer articles using a co-additive composition in addition to nucleating and clarifying agents is disclosed.