Multilayer Film Tie Layer for Printability and Scratch Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polypropylene (PP) films and panels in the packaging and automotive industries face limitations such as poor printability/paintability, scratch resistance, and mar resistance, which restrict their applications.
Innovation Solution
A multilayer film comprising a first layer of polypropylene, a tie layer with a crystalline block composite and carboxylated olefin copolymer, and a second layer of ethylene ionomer or acrylic acid ethylene copolymer, where the tie layer enhances the bonding and performance of the first and second layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polypropylene is used for packaging films and automotive panels, then high stiffness, good clarity, and high temperature performance are achieved, but poor printability, paintability, scratch resistance, and mar resistance occur
Solution Approach 1:
The patent applies composite materials by creating a multilayer film structure where a polypropylene layer is combined with a tie layer containing carboxylated olefin copolymer and crystalline block composite. This composite structure allows the polypropylene layer to provide stiffness and clarity while the tie layer with modified surfaces improves printability and paintability, thus resolving the contradiction between mechanical strength and ease of manufacture.
2Strength
If polypropylene is used for packaging films and automotive panels, then high stiffness, good clarity, and high temperature performance are achieved, but poor scratch resistance and mar resistance occur
Solution Approach 1:
The patent uses composite materials by forming a multilayer structure where the polypropylene layer provides stiffness while the tie layer containing carboxylated olefin copolymer and crystalline block composite enhances scratch and mar resistance through improved surface properties and interlayer bonding, thus resolving the contradiction between strength and reliability.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition of the tie layer to include carboxylated olefin copolymer with specific carboxyl content (0.5-10 mmol/g) and crystalline block composite, which changes the surface energy and adhesion properties to improve scratch and mar resistance while maintaining the stiffness provided by the polypropylene layer.
3Ease of manufacture
If a multilayer film structure with tie layer is used, then printability, paintability, scratch resistance, and mar resistance are improved, but device complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a tie layer as a mediator between the polypropylene layer and the outer layers. This tie layer contains carboxylated olefin copolymer and crystalline block composite that facilitate adhesion and improve surface properties, enabling better printability and paintability without requiring complex processing equipment or procedures, thus resolving the contradiction between ease of manufacture and device complexity.
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 multilayer film exhibits improved printability, paintability, scratch resistance, and mar resistance, making it suitable for automotive panels and packaging applications while maintaining low weight and cost benefits.
Implementation Method 1
the tie layer comprises a crystalline block composite and a carboxylated olefin copolymer
Data Source
AI summary
Disclosed herein is a multilayer film comprising a first layer and a second layer; and a tie layer; where the tie layer is disposed between the first layer and the second layer; the first layer being disposed on a first surface of the tie layer; the second layer being disposed on a second surface of the tie layer; where the second surface is opposedly disposed to the first surface; where the tie layer comprises a crystalline block composite and a carboxylated olefin copolymer.