Adhesive Resin Composition for Polyester Laminates
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Solution Overview
Problem
Adhesive resin compositions used in laminates for food and industrial packaging face issues such as fish-eyes during film formation, insufficient adhesion strength to polyester resins at high temperatures, and instability under heat, leading to poor handling and environmental contamination.
Innovation Solution
A modified adhesive resin composition comprising a propylene polymer obtained through successive polymerization, with specific ratios of propylene homopolymer and copolymer components, and modified with unsaturated carboxylic acids, which enhances adhesion to polyester resins and maintains heat resistance while preventing fish-eyes and thermal instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive resin compositions are used, then initial adhesiveness is achieved, but heat-resistant adhesiveness deteriorates at high temperatures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight distribution (Mw/Mn ratio between 1.05-2.0) and composition ratios of propylene polymer components. This optimization enables the adhesive resin to maintain strong adhesion to polyester resins across a wide temperature range from -30°C to 100°C, resolving the contradiction between initial and heat-resistant adhesiveness
Solution Approach 2:
The patent uses composite materials by combining specific propylene polymer components with polyester resins in controlled ratios. The composite adhesive resin layer integrates different polymer characteristics to achieve both strong initial bonding and sustained heat-resistant adhesion, preventing layer separation under thermal stress
2Reliability
If film formation is performed with conventional compositions, then adhesive properties are achieved, but film quality deteriorates due to fish-eyes
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight distribution (Mw/Mn ratio) and composition ratios of the propylene polymer components. These parameter optimizations eliminate fish-eye defects during film formation while preserving excellent adhesive properties, achieving both reliable adhesion and high film quality
Solution Approach 2:
The patent applies preliminary action by pre-optimizing the molecular weight distribution and composition ratios before film formation. This preliminary optimization of resin parameters prevents fish-eye defects from forming during the extrusion and lamination processes, ensuring high film quality from the start
3Temperature
If adhesive resin compositions are used for high-temperature applications, then heat resistance is improved, but handling stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight distribution (Mw/Mn ratio between 1.05-2.0) and composition ratios. This optimization provides the adhesive resin with stable handling properties at room temperature while maintaining excellent heat resistance up to 100°C, resolving the contradiction between handling stability and heat resistance
4Ease of manufacture
If conventional laminating methods are used, then lamination is achieved, but adhesion durability deteriorates under thermal stress
Solution Approach 1:
The patent uses composite materials by formulating an adhesive resin layer with optimized propylene polymer components and controlled molecular weight distribution. This composite adhesive layer creates durable bonding between polyester resin layers that withstands thermal stress during retortion and sterilization, ensuring long-term adhesion durability while maintaining ease of manufacture
Solution Approach 2:
The patent applies parameter changes by optimizing the molecular weight distribution (Mw/Mn ratio) and composition ratios of the adhesive resin. These parameter optimizations enable the laminate to maintain strong adhesion under thermal stress during processing and use, significantly improving adhesion durability without complicating the lamination process
Data Source
AI summary
An adhesive resin composition excellent in adhesiveness and heat resistance thereof, film-forming properties, and film quality and a laminate having an adhesive resin layer made of this adhesive resin composition are provided.The Composition is an adhesive resin composition comprising 10-99.5% by weight resin ingredient (A), 0.5-30% by weight another resin ingredient (unsaturated-carboxylic-acid-modified polypropylene), and 0-89.5% by weight still another resin ingredient (olefin resin).Resin ingredient (A): a product of successive propylene polymerization comprising 10-60% by weight (propylene homopolymer) component and 40-90% by weight (propylene/ethylene copolymer) component. The contents of room-temperature-xylene solubles derived from (a2), room-temperature-xylene insolubles derived from (a2), and room-temperature-xylene solubles derived from the same are 1-20% by weight, lower than 20% by weight, and 10-60% by weight, respectively, based on resin ingredient (A). The room-temperature-xylene solubles derived from (a2) have a content of α-olefins excluding propylene of 20% by weight or higher.