DBS Derivatives for Polyolefin Clarity and Thermal Stability
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Solution Overview
Problem
Current nucleating and clarifying agents for polyolefin resins face challenges in reducing haze, thermal stability, and organoleptic issues, such as yellowing and taste transfer, which affect the clarity and suitability of plastic articles.
Innovation Solution
Development of dibenzylidene sorbitol (DBS) derivatives with specific substitutions, such as allyl and n-propyl groups on the sorbitol chain, which act as novel nucleating or clarifying agents, providing improved transparency, reduced yellowing, and enhanced organoleptic properties when used in polyolefin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional nucleating or clarifying agents are used to reduce haze in polyolefin articles, then clarity is improved, but thermal stability deteriorates causing yellowing at high processing temperatures
Solution Approach 1:
The patent modifies the chemical structure of DBS-based compounds by substituting various groups on the benzyl ring portions to optimize both clarity and thermal stability. Specific substitutions at different positions (R1, R2, R3, R4, R5, R6) are explored to achieve the right balance between haze reduction and resistance to yellowing at high temperatures
Solution Approach 2:
The invention creates composite molecular structures by combining DBS core with various aromatic substituents, resulting in hybrid compounds that exhibit both the desired clarifying properties and enhanced thermal stability. The composite structure allows synergistic effects where the DBS portion provides nucleating activity while the aromatic groups contribute to thermal resistance
2Illumination intensity
If conventional nucleating or clarifying agents are used to reduce haze, then transparency is improved, but organoleptic properties deteriorate causing undesirable taste transfer
Solution Approach 1:
The patent systematically varies the substituent groups on the DBS molecule to modify its organoleptic properties. By changing the chemical nature of substituents (hydrophobic, hydrophilic, aromatic, aliphatic), the compound's tendency to transfer taste is reduced while maintaining its clarifying function
Solution Approach 2:
The invention develops a class of compounds where the active clarifying component is designed to perform its function during processing and then remain inert in the final product, effectively 'disappearing' from the functional picture and leaving no residual taste impact on food or beverage contact applications
3Illumination intensity
If higher concentrations of clarifying agents are used to achieve lower haze levels, then clarity is improved, but yellowing increases due to poor thermal stability
Solution Approach 1:
The patent optimizes the concentration-effect relationship by developing compounds with higher intrinsic efficiency. The modified DBS structures achieve superior haze reduction at lower concentrations, reducing the total amount of additive present that could potentially yellow during processing
Solution Approach 2:
The aromatic substituents on the DBS molecule provide preemptive protection against thermal degradation. These groups are positioned to stabilize the molecule before processing occurs, preventing the formation of yellowing byproducts even when the compound is exposed to high temperatures during manufacturing
Data Source
AI summary
The present invention relates to dibenzylidene sorbitol ("DBS")-based compounds. The compounds of this invention are particularly advantageous in that they are characterized by one or more of improved transparency (reduced haze), reduced yellowing and/or improved organoleptics (taste). According to one embodiment, the present invention provides a disubstituted DBS-based compound having an allyl group or a propyl group substituted on the first carbon of the sorbitol chain. The present invention also relates to compositions comprising such DBS-based compounds and methods for using them.