Linerless Label Adhesive Composition Blocking Prevention
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Solution Overview
Problem
Existing adhesive compositions for labels require release papers or films to prevent blocking, which incur additional costs and material usage, and existing solutions that eliminate these require high temperatures and pressures for activation.
Innovation Solution
An aqueous adhesive composition combining acrylate polymers with a glass transition temperature between +50°C to +90°C and amorphous polyurethane or polyurethane-polyurea polymers with a glass transition temperature between −50°C to +10°C, allowing for the formation of heat-activated adhesive layers that prevent blocking at high winding tensions and temperatures up to 50°C without the need for release papers or films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If release paper or film is used to prevent blocking, then blocking prevention is improved, but material costs and device complexity increase
Solution Approach 1:
The invention extracts and eliminates the release paper or film component from the label structure by developing an adhesive composition that inherently prevents blocking through its specific polymer formulation, thereby simplifying the overall structure while maintaining blocking prevention functionality
Solution Approach 2:
The invention changes the parameter of glass transition temperature by combining polymers with Tg>+50°C and Tg<+10°C to create an adhesive that remains non-tacky at room temperature but becomes activatable at elevated temperatures, eliminating the need for release papers
2Reliability
If release paper or film is used to prevent blocking, then blocking prevention is improved, but material costs increase
Solution Approach 1:
The invention removes the release paper component entirely, eliminating the associated material costs while maintaining blocking prevention through the engineered adhesive composition's temperature-dependent properties
Solution Approach 2:
The adhesive composition provides self-service blocking prevention through its inherent temperature-dependent tackiness, eliminating the need for separate release paper components and their associated costs
3Reliability
If polymers with Tg>+50°C are used, then blocking prevention is improved, but activation temperature increases
Solution Approach 1:
The invention creates a composite adhesive system combining polymers with Tg>+50°C (for blocking prevention) and Tg<+10°C (for lower temperature activation), achieving both blocking prevention and reduced activation temperature requirements
Solution Approach 2:
The invention changes the activation temperature parameter by introducing low-Tg polymers that become tacky at lower temperatures, allowing the high-Tg polymer system to be activated without requiring excessively high temperatures
4Ease of operation
If pressure sensitive adhesive is used, then ease of application is improved, but blocking occurs during rolling
Solution Approach 1:
The invention changes the temperature parameter of the adhesive system, creating pressure-sensitive adhesive that remains non-tacky at room temperature (preventing blocking) but becomes activatable at elevated temperatures (maintaining application ease when needed)
Solution Approach 2:
The invention introduces dynamic temperature-dependent properties to the adhesive, allowing it to switch between non-tacky (during rolling) and tacky (during application) states based on temperature conditions
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 adhesive composition effectively prevents label blocking at high temperatures and tensions without release papers, enabling the use of 'linerless labels' with improved adhesive properties and reduced material costs, while being activatable at temperatures below 90°C.
Implementation Method 1
at least one acrylate polymer with a glass transition temperature Tg in the range from +50° C. to +90° C. and at least one amorphous polyurethane or polyurethane-polyurea polymer with a glass transition temperature Tg in the range from −50° C. to +10° C.
Implementation Method 2
can at the same time be activated at temperatures above 50° C.
Implementation Method 3
does not lead to a blocking of the label layers even at high winding tensions and at temperatures up to 50° C.
Data Source
AI summary
The invention relates to an aqueous adhesive composition containing at least one acrylate polymer with a glass transition temperature Tg>50° C. and at least one amorphous polyurethane or polyurethane-polyurea polymer with a glass transition temperature Tg<+10° C., the use of the adhesive compositions for the manufacture of heat-activated adhesive layers, and planar formations containing adhesive layers based on the adhesive composition.