Transparent Polyamide Moulding Compounds with Low Haze
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Solution Overview
Problem
The existing methods for producing glass-filled polyamide molding compounds with improved optical and mechanical properties are inefficient, as they require precise control of refractive index matching between glass and polymer, which is costly and impractical for cost-effective production, and result in compromised haze and transparency when glass fillers are incorporated.
Innovation Solution
A polyamide molding compound comprising 50-95% of a mixture of transparent, partially aromatic polyamides and 5-50% of a glass filler with a refractive index between 1.540 and 1.600, optimized to maintain low haze and high transparency while providing mechanical strength and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fillers are added to polyamide molding compounds to increase stiffness, strength, and surface scratch resistance, then mechanical properties are improved, but optical properties deteriorate with increased haze and reduced transparency
Solution Approach 1:
The patent changes the refractive index parameter of the glass filler from conventional values (1.49-1.53) to a higher range (1.54-1.60), which fundamentally alters the optical interaction between filler and polymer matrix. This parameter change reduces the refractive index mismatch with aromatic polyamides, thereby maintaining transparency and low haze while incorporating glass fillers for mechanical reinforcement
Solution Approach 2:
The patent creates a composite material system specifically designed for aromatic polyamides, combining glass fillers with refractive indices of 1.54-1.60 with aromatic polyamide matrices. This specialized composite formulation achieves synergistic effects where the specific refractive index matching enables both optical clarity and mechanical reinforcement to coexist
2Object-affected harmful factors
If the refractive index of glass filler is matched precisely to the polymer (deviation ≤ 0.002) to maintain optical properties, then transparency is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent shifts the refractive index parameter to a higher range (1.54-1.60) that naturally aligns with aromatic polyamides, eliminating the need for ultra-precise matching within ±0.002. This parameter change broadens the acceptable tolerance range and simplifies glass production requirements while maintaining optical clarity
Solution Approach 2:
The patent develops a universal glass filler solution with refractive indices of 1.54-1.60 that can be applied across various aromatic polyamide formulations. This universal glass composition works effectively with different aromatic polyamide types without requiring custom glass formulations for each polymer, thereby simplifying manufacturing and reducing costs
3Adaptability or versatility
If polyamide composition is varied to achieve specific property profiles, then application-specific properties are improved, but refractive index changes require new glass development, increasing production time and cost
Solution Approach 1:
The patent creates a universal glass filler solution with refractive indices of 1.54-1.60 that can be applied across various aromatic polyamide formulations. This universal glass composition works effectively with different aromatic polyamide types regardless of their specific property profiles, eliminating the need to develop new glass formulations when polymer compositions are adjusted
Solution Approach 2:
By establishing a higher refractive index range (1.54-1.60) for glass fillers, the patent creates a robust parameter foundation that remains effective across varying polyamide compositions. This parameter selection provides a buffer against refractive index variations in the polymer matrix, maintaining optical properties even when polyamide formulations are adjusted for different applications
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 solution effectively maintains good optical properties and mechanical strength, including low haze and high transparency, while simplifying the production process by eliminating the need for precise refractive index matching, thus enhancing processing efficiency and reducing costs.
Implementation Method 1
match the refractive index of the glass to that of the polymer... the refractive index can be set in the range from 1.510 to 1.540... the refractive index to be set for the glass should not deviate from that of the polymer by more than 0.002
Data Source
AI summary
The present invention relates to a polyamide molding compound containing or consisting of the following components: (A) 50 to 95 wt.% of a mixture consisting of the specific polyamides (A1) and (A2), (B) 5 to 50 wt.% of at least one glass filler having a refractive index in the range of 1.540 to 1.600; (C) 0 to 10 wt.% of at least one additive; wherein the weight percentages of components (A) to (C) supplement each other to 100 wt.%; wherein the content of (A1) in the mixture (A) is > 50 wt% if the ratio Δ2/Δ1 is > 1 and the content of (A2) in the mixture (A) is > 50 wt% if the ratio Δ2/Δ1 ≤ 1, wherein Δ1 = n (A1) - n(B) and Δ2 = n(B) - n(A2); wherein the transparent polyamides (A1) and (A2) have a transparency of at least 90% and a haze of at most 3%; and wherein the mixture (A) has a transparency of at least 88% and a haze of at most 5%.Furthermore, the present invention relates to molded bodies made from these polyamide molding compounds.