Polyester Resin Composition Gas Barrier Transparency
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Solution Overview
Problem
Aromatic polyester resins lack sufficient gas barrier properties, transparency, and mechanical properties, limiting their applications, especially when combined with polyamide resins like polyamide MXD6, which can result in cloudy compositions and reduced thermal stability.
Innovation Solution
A specific polyester resin composition comprising 2-30% polyamide resin (A) derived from metaxylylenediamine and adipic acid, 69.5-97.99% polyester resin (B) derived from aromatic dicarboxylic acid and aliphatic diol, and 0.01-0.5% polycarboxylic acid (C), with precise ratios and processing methods to prevent coloration and enhance gas barrier and transparency properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide resin is mixed with aromatic polyester resin to improve gas barrier properties, then gas barrier properties are improved, but transparency deteriorates due to pearly gloss formation
Solution Approach 1:
The patent applies parameter changes by precisely controlling the terminal amino group concentration (0.01-10 μeq/g) and terminal carboxyl group concentration (0.01-10 μeq/g) of the polyamide resin, as well as the molecular weight ratio between polyamide and polyester resins. These parameter optimizations enable the composition to achieve both high gas barrier properties and excellent transparency by minimizing pearly gloss formation while maintaining functional performance.
Solution Approach 2:
The patent creates a composite material system by formulating a specific composition of polyamide resin (2-50 parts by weight) and aromatic polyester resin (50-98 parts by weight), where the two resins work synergistically. The composite achieves enhanced gas barrier properties from the polyamide component while maintaining transparency through optimized composition ratios and molecular weight relationships, resolving the contradiction between gas barrier performance and optical clarity.
2Reliability
If polyamide resin is added to aromatic polyester resin, then gas barrier properties are improved, but mechanical properties and stretchability deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight of both polyamide and polyester resins, and controlling their molecular weight ratio within specific ranges. Additionally, the terminal amino group concentration (0.01-10 μeq/g) and terminal carboxyl group concentration (0.01-10 μeq/g) are precisely controlled. These parameter optimizations ensure that the polyamide resin enhances gas barrier properties without compromising the mechanical properties and stretchability of the aromatic polyester resin matrix.
3Reliability
If conventional methods are used to impart gas barrier properties (metal foil lamination, coating, vapor deposition), then gas barrier properties are improved, but production complexity increases and mechanical properties deteriorate
Solution Approach 1:
The patent merges the gas barrier function directly into the resin composition itself by incorporating polyamide resin (2-50 parts by weight) into the aromatic polyester resin matrix (50-98 parts by weight). This integration eliminates the need for separate gas barrier layers, metal foil laminations, or vapor deposition processes. The resulting single-layer composition achieves high gas barrier properties while simplifying production steps and maintaining mechanical integrity.
Solution Approach 2:
The patent creates an intrinsically composite material where polyamide resin and aromatic polyester resin are combined at the molecular level through melt mixing. This composite resin system provides gas barrier properties inherent to the material structure, eliminating the need for complex multi-layer structures or surface treatments. The composition achieves both functional performance and production simplicity through this integrated composite approach.
4Reliability
If polyamide resin concentration is increased to improve gas barrier properties, then gas barrier properties are improved, but transparency and mechanical properties deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing optimal concentration ranges for polyamide resin (2-50 parts by weight, preferably 5-20 parts) and terminal group concentrations (0.01-10 μeq/g). These parameter optimizations identify the sweet spot where gas barrier properties are maximized while transparency and mechanical properties are preserved. The preferred range of 5-20 parts polyamide resin provides the best balance among all performance criteria.
Data Source
AI summary
Provided are a resin composition which is colored little and has excellent gas barrier properties, transparency and mechanical properties, a method for producing it, and a shaped article. The composition is a polyester resin composition comprising from 2 to 30 % by weight of a specific polyamide resin (A), from 69.5 to 97.99 % by weight of a specific polyester resin (B) and from 0.01 to 0.5 % by weight of a di- and/or tri-polycarboxylic acid compound (c), which satisfies a ≤ b, 60 ≤ a + b ≤ 150, 1 ≤ c × Cc ≤ 20, 1 ≤ c × Cc/(a × Ca) ≤ 12 (wherein a is a concentration of the terminal amino group of the polyamide resin (A), b is a concentration of the terminal carboxyl group of the polyamide resin (A), c is a concentration of the carboxyl group in the polycarboxylic acid compound (C), Cc is a concentration of the polycarboxylic acid compound (C) in the polyester resin composition, and Ca is a concentration of the polyamide resin (A) in the polyester resin composition (g/g). The method is for producing the resin composition; and the shaped article is obtained by shaping the resin composition.