Laminated Polyester Film Adhesion to Polypropylene
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Solution Overview
Problem
Conventional laminated polyester films with polyolefins, particularly polypropylene, suffer from poor adhesion, requiring additional adhesive layers that increase costs and reduce productivity.
Innovation Solution
A laminated polyester film with a coating layer comprising a modified polyolefin having two melting points and at least one crosslinking agent, applied to the polyester film to enhance adhesion, where the modified polyolefin has a melting point range of 0 to 50°C and 50 to 180°C, and the crosslinking agent improves the coating layer's adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is added to improve adhesion between polyester film and polyolefin, then adhesion property is improved, but productivity decreases and costs increase
Solution Approach 1:
The invention extracts and eliminates the separate adhesive layer from the laminate structure by incorporating adhesion-modifying functionality directly into the polyester film through a coating layer, thereby removing the source of productivity loss and cost increase while maintaining adhesion improvement
Solution Approach 2:
The invention merges the adhesion-modifying function with the polyester film by forming a coating layer on its surface, combining multiple functions (film strength and adhesion) into a single integrated structure, eliminating the need for separate adhesive layers
2Reliability
If an adhesive layer is added to improve adhesion between polyester film and polyolefin, then adhesion property is improved, but costs increase
Solution Approach 1:
The invention extracts and eliminates the separate adhesive layer from the laminate structure by incorporating adhesion-modifying functionality directly into the polyester film through a coating layer, thereby removing the source of cost increase while maintaining adhesion improvement
Solution Approach 2:
The coating layer on the polyester film serves multiple functions: it provides adhesion to polyolefin and maintains the film's mechanical properties, making the polyester film itself multi-functional and eliminating the need for separate adhesive components
3Reliability
If a conventional adhesion-modifying layer is provided on polyester film, then adhesion property is partially improved, but satisfactory adhesion to polyolefins is still not achieved
Solution Approach 1:
The invention changes the chemical composition parameters of the coating layer by incorporating specific compounds (carboxyl-terminated polybutadiene and phosphoric acid or its esters) in controlled amounts, transforming the coating from conventional adhesion-modifying layers to a composition that achieves satisfactory adhesion to polyolefins
Solution Approach 2:
The invention creates a composite coating layer structure combining polyester resin with specific adhesion-promoting compounds (carboxyl-terminated polybutadiene and phosphoric acid or its esters), forming a composite material that achieves both adhesion improvement and manufacturing precision
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 provides a laminated polyester film with excellent adhesion to polyolefins, specifically polypropylene, enhancing industrial value by eliminating the need for additional adhesive layers and improving film properties.
Implementation Method 1
the modified polyolefin has two melting points Tm of which a melting point Tm1 on a lower temperature side is in the range of 0 to 50°C and a melting point Tm2 on a higher temperature side is in the range of 50 to 180°C
Implementation Method 2
a coating layer which comprises a modified polyolefin having two melting points and at least one crosslinking agent
Data Source
AI summary
The present invention provides a laminated polyester film which can be suitably used for extrusion lamination with polyolefins and comprises a coating layer having an excellent adhesion property to the polyolefins, in particular, a coating layer having a remarkably excellent adhesion property to polypropylene. The laminated polyester film of the present invention comprises a polyester film and a coating layer formed on a surface of the polyester film which is formed by applying a coating composition comprising (A) a modified polyolefin having two melting points or (B) a polyolefin copolymer comprising a propylene-based polymer and a hydrophilic polymer, and at least one crosslinking agent, and then drying the coating composition applied.