Functionalized Polyolefin Lamination Film High Green Tack
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Solution Overview
Problem
The flexible packaging industry faces limitations in lamination processes due to the curing time of adhesives used, leading to delays in the manufacturing process and issues like telescoping, especially with high solids, low molecular weight adhesives that have low green tack values.
Innovation Solution
A combination of a functionalized film with a polar-reactive group polyolefin layer and a lamination adhesive composition having a high green tack value (>0.772 N/cm or 200 g-f/in) is used, allowing for immediate use in manufacturing and minimizing telescoping issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high solids, low molecular weight adhesives are used to achieve fast lamination, then lamination speed is improved, but green tack value is insufficient leading to telescoping and long curing wait times
Solution Approach 1:
The patent uses a composite adhesive system combining a polyolefin polymer matrix with reactive functional groups (maleic anhydride, carboxylic acid, or hydroxyl groups) grafted onto the polymer chains. This composite structure provides both the rapid initial bonding (green tack) needed for fast lamination and the chemical reactivity required for strong final adhesion, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent modifies the chemical parameters of the polyolefin adhesive by introducing reactive functional groups through grafting. This changes the adhesive's properties from simple physical bonding to chemical bonding capability, enabling high green tack values (>200 g-f/in) while maintaining fast curing characteristics. The functional groups react with substrates to provide immediate strong bonding without telescoping.
2Productivity
If high solids, low molecular weight adhesives are used to reduce curing time, then productivity is improved, but bond strength development is delayed
Solution Approach 1:
The patent provides preliminary chemical action through the reactive functional groups grafted on the polyolefin chains. These groups are pre-positioned to react with substrate surfaces upon contact, providing immediate bond strength development. This preliminary chemical bonding action eliminates the need for long waiting periods while ensuring strong final adhesion, thus improving productivity without sacrificing bond strength.
Solution Approach 2:
The patent replaces purely mechanical/physical bonding mechanisms with chemical bonding mechanisms. The reactive functional groups (maleic anhydride, carboxylic acid, hydroxyl) form chemical bonds with substrates, providing rapid and strong adhesion development. This substitution of bonding mechanism enables fast curing times while maintaining high bond strength, resolving the contradiction between productivity and strength development.
3Reliability
If conventional adhesives are used to ensure adequate bond strength, then adhesion reliability is improved, but green tack is insufficient causing telescoping issues
Solution Approach 1:
The patent changes the chemical parameters of the adhesive by grafting reactive functional groups onto polyolefin chains. This modification enables the adhesive to achieve high green tack values (>200 g-f/in) through immediate chemical interaction with substrates, while simultaneously ensuring reliable long-term adhesion. The dual functionality of the modified polymer resolves the contradiction between ease of operation and adhesion reliability.
Solution Approach 2:
The patent creates a composite adhesive material combining the structural properties of polyolefin polymers with the reactive properties of grafted functional groups. This composite structure provides both high green tack for easy operation and reliable adhesion for structural integrity, eliminating telescoping issues while maintaining ease of use in the lamination process.
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
This combination enables faster subsequent conversion steps and enhances the productivity of the packaging film manufacturing process by providing a strong bond and rapid bond strength development, eliminating the need for long wait times for adhesion to build up.
Implementation Method 1
at least one functionalized film layer comprising a polar-reactive group polyolefin layer used as an internal layer in the film structure
Data Source
AI summary
A film structure including: (a) at least one functionalized film layer, wherein the at least one film layer comprises a polar-reactive group polyolefin layer used as an internal layer in the film structure; and (b) a lamination adhesive composition present on, and in contact with, a least a portion of a surface of the internal layer; wherein the green tack value of the adhesive composition is greater than 0.772 Newtons/centimeter; a laminate including the above film structure bonded to a substrate layer; a process for producing the film structure; a process for producing the laminate; and a laminated article made from the above laminate.