Impact-Modified Poly(meth)acrylimide Films for High-Temperature Forgery Prevention
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Solution Overview
Problem
Existing forgery prevention labels face challenges with high brittleness, limited thermal and chemical stability, and difficulties in manufacturing and handling, especially at high temperatures, leading to issues like shrinkage and breakage during processing, which affects their effectiveness and efficiency in high-temperature applications.
Innovation Solution
The development of impact-modified poly(meth)acrylimide films with specific compositions and processing methods that allow for the production of heat-resistant, brittle films suitable for high-temperature applications, enabling efficient manufacturing and handling without breakage, and ensuring complete rupture upon unauthorized removal attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional materials (PET, PVC, BOPP) are used for high-temperature labels, then processing is easier, but shrinkage occurs at extended temperatures
Solution Approach 1:
The patent changes the material composition parameters by using poly(meth)acrylimide instead of conventional PET, PVC, or BOPP materials. This polymer provides dimensional stability at temperatures above 100°C while maintaining processability through extrusion, directly resolving the shrinkage issue without sacrificing ease of manufacture
Solution Approach 2:
The invention uses composite material structures with poly(meth)acrylimide as the base polymer, potentially combined with impact modifiers and other additives to achieve both high-temperature stability and ease of processing. The composite approach allows optimization of both contradictory properties
2Reliability
If brittle acrylic films are used for forgery prevention, then anti-counterfeit security is improved, but handling and manufacturing become significantly more difficult
Solution Approach 1:
The patent modifies the physical parameters of acrylic films by using poly(meth)acrylimide, which maintains the required brittleness for security applications (bonding strength higher than label strength) while improving handling characteristics compared to conventional brittle acrylic films. The material can be processed by extrusion without excessive breaking or tearing
Solution Approach 2:
The invention achieves different mechanical properties in different aspects of the material: high brittleness and bonding strength where needed for security, while maintaining sufficient flexibility and toughness for industrial handling and processing
3Productivity
If extruded films are used for high-temperature applications, then manufacturing efficiency is improved, but shrinkage in machine-direction occurs
Solution Approach 1:
The patent changes the polymer composition parameter to poly(meth)acrylimide, which eliminates the shrinkage problem in the machine-direction that plagues conventional extruded films at high temperatures. The material maintains dimensional stability while remaining suitable for extrusion processing, preserving manufacturing efficiency
4Strength
If PVC films are used for forgery prevention labels, then initial tear strength is reduced, but tear propagation resistance remains high allowing unauthorized peeling
Solution Approach 1:
The patent changes the material from PVC to poly(meth)acrylimide, which provides the optimal balance between initial tear strength and tear propagation resistance. The material has low initial tear strength to prevent easy removal, while ensuring complete rupture and destruction upon unauthorized peeling attempts, eliminating the security vulnerability of PVC films
Data Source
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AI summary
The present invention relates to heat resistant brittle films made from impact-modified poly(meth)acrylimide and forgery prevention labels comprising the same. The films can be advantageously prepared by extrusion and, depending on the desired purpose, can be designed to be transparent, translucent or entirely non-transparent e.g. white. Ideally, the brittle films and the forgery prevention labels comprising the same have no intended break points such as slits, perforation etc.