Polyamide Clarification via Urea Nucleating Agents
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Solution Overview
Problem
Polyamide compositions often exhibit optical opacity due to crystalline domains, lacking effective clarifiers to achieve transparency and reduce haze, which is crucial for applications requiring clarity and laser transparency.
Innovation Solution
Incorporation of urea compounds of specific formulas into polyamide compositions to act as clarifying agents, improving optical properties by reducing haze, increasing clarity, and enhancing laser transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide is used as a semicrystalline polymer, then mechanical strength and performance properties are improved, but optical transparency deteriorates due to light scattering by crystalline domains
Solution Approach 1:
The patent changes the physical-chemical parameters of the polyamide system by introducing urea compounds that modify the crystallization behavior. These compounds alter the crystal structure parameters and size distribution, enabling the material to maintain mechanical strength while improving optical transparency through controlled crystalline domain modification.
Solution Approach 2:
The patent creates a composite system by combining polyamide with urea compounds (specifically trans-1,4-cyclohexylenebis(3-phenylurea) and related structures). This composite approach allows the urea compounds to interact with the polyamide crystalline domains, modifying their light-scattering properties while preserving the base polymer's mechanical strength.
2Illumination intensity
If clarifying agents are added to improve optical properties, then clarity and haze reduction are achieved, but the effectiveness is insufficient or unknown for polyamide compositions
Solution Approach 1:
The urea compounds act as intermediary substances between the light and the polyamide crystalline domains. They modify the crystalline structure in a way that reduces light scattering, effectively serving as a mediator that improves clarity without compromising the polymer's fundamental properties. The specific molecular structure of the urea compounds enables them to integrate into and modify the polyamide crystal lattice.
3Illumination intensity
If haze is reduced to improve transparency, then optical clarity is enhanced, but laser transparency may be affected
Solution Approach 1:
The patent applies local quality modification by specifically targeting the crystalline domain structure with urea compounds. The treatment is localized to the crystal lattice level, where the urea compounds modify the internal structure of crystalline regions to reduce light scattering. This localized modification improves optical clarity while maintaining the bulk material's laser transparency properties, as the amorphous regions and overall polymer matrix remain unchanged.
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 use of these urea compounds significantly reduces haze by at least 5%, increases clarity by at least 5%, and enhances laser transparency by at least 1% compared to reference compositions, making the polyamide compositions more suitable for transparent applications.
Implementation Method 1
Nucleating agents and clarifiers are commonly used in industrial practice in combination with crystallizable thermoplastic polymers to improve optical properties
Implementation Method 2
Many polyamides, however, are semicrystalline and thus optically opaque due to the scattering of incident light by the crystalline domains present in the polyamide
Data Source
AI summary
The present invention relates to a polymer composition comprising at least one polyamide and at least one urea compound of the formula I where x is 1, 2 or 3; R1 and R2 are selected from hydrogen, linear C1-C7-alkyl, branched C3-C10-alkyl, unsubstituted or substituted C3-C12-cycloalkyl, unsubstituted or substituted C3-C12-cycloalkyl-C1-C4-alkyl, unsubstituted or substituted aryl and unsubstituted or substituted aryl-C1-C4-alkyl; and Z is selected from C3-C10-alkanediyl, unsubstituted or substituted arylene, unsubstituted or substituted aryl unsubstituted or substituted ene-C1-C4-alkylene-arylene, unsubstituted or substituted heteroarylene, unsubstituted or substituted heteroarylene-C1-C4-alkylene-heteroarylene, unsubstituted or substituted C5-C8-cycloalkylene, C5-C8-cycloalkylene-C1-C4-alkylene-C5-C8-cycloalkylene, unsubstituted or substituted heterocycloalkylene and heterocycloalkylene-C1-C4-alkylene-heterocycloalkylene. This urea compound is used for improving the optical properties of the polyamide polymer composition. The present invention also relates to shaped articles obtained from said composition and to novel urea compounds.