Acrylic Block Copolymer Lamination Barrier
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Solution Overview
Problem
Existing laminating processes with plasticizer-containing polymer compositions face challenges in minimizing plasticizer migration into acrylic thermoplastic polymer layers, leading to reduced durability and adhesive strength in laminates, particularly when combined with vinyl chloride-based polymers.
Innovation Solution
A laminating acrylic thermoplastic polymer composition incorporating an acrylic block copolymer with specific methacrylic and acrylic acid ester units, optimized molecular weight, and solubility parameters to reduce plasticizer migration and enhance adhesive properties, including the use of phthalic acid ester-based plasticizers and thermal melting for lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plasticizer-containing polymer composition is laminated with an acrylic thermoplastic polymer layer, then the laminate achieves flexibility and processability, but the plasticizer migrates into the acrylic layer causing contamination and reduced durability
Solution Approach 1:
The patent introduces a specific acrylic block copolymer as an intermediary barrier layer between the plasticizer-containing polymer and the acrylic thermoplastic polymer. This copolymer, with its controlled composition and molecular weight, acts as a mediator that prevents plasticizer migration while maintaining the flexibility and processability benefits of the plasticizer-containing layer.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the solubility parameters, molecular weight, and composition of the acrylic block copolymer. By adjusting these parameters, the copolymer creates an optimal barrier that is incompatible with plasticizer migration while maintaining compatibility with both adjacent layers, thus resolving the contradiction between processability and durability.
2Stability of the object's composition
If existing plasticizers are used to enhance flexibility and workability, then the polymer composition shows improved flexibility, but the plasticizer exhibits high migration tendency into adjacent layers
Solution Approach 1:
The acrylic block copolymer serves as an intermediary barrier that blocks the migration path of plasticizers while allowing the plasticizer-containing layer to maintain its flexibility. The copolymer's specific structure creates a physical and chemical barrier that prevents plasticizer molecules from diffusing into the adjacent acrylic thermoplastic layer.
Solution Approach 2:
The patent applies local quality by creating a zone with specific properties (the acrylic block copolymer layer) that has different compatibility characteristics than the adjacent layers. This localized intervention provides plasticizer resistance exactly where needed at the interface, while the bulk plasticizer-containing layer retains its flexibility and workability properties.
3Reliability
If the acrylic thermoplastic polymer layer is made more resistant to plasticizer migration, then durability is improved, but adhesive strength with vinyl chloride-based polymers deteriorates
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the solubility parameters, molecular weight distribution, and block composition of the acrylic block copolymer. These parameter adjustments create a material that simultaneously achieves plasticizer resistance through solubility mismatch while maintaining adhesive strength through appropriate molecular weight and functional group content.
Solution Approach 2:
The acrylic block copolymer itself is a composite material structure consisting of different polymer blocks with complementary properties. One block provides plasticizer resistance through solubility parameter mismatch, while another block provides adhesive functionality, thus combining both required properties in a single material system.
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 effectively minimizes plasticizer migration, ensuring excellent durability and maintaining sufficient adhesive force with vinyl chloride-based polymers, resulting in a laminate with improved thermal stability and resistance to plasticizers.
Implementation Method 1
the solubility parameter SP (B) of the polymer block (B) and the solubility parameter SP (P) of the plasticizer satisfy the following relationship: SP (B)−SP (P)>0.35
Implementation Method 2
thermal melting for lamination
Implementation Method 3
laminating a layer including the laminating acrylic thermoplastic polymer composition onto one or both sides of a layer including the plasticizer-containing polymer composition
Data Source
AI summary
The invention provides a laminating acrylic thermoplastic polymer composition which is favorably laminated together with a layer including a plasticizer-containing polymer composition while ensuring that the migration of the plasticizer into the acrylic thermoplastic polymer composition layer is small and the resultant laminate attains excellent durability, and also provides a laminate obtained by laminating a layer including the laminating acrylic thermoplastic polymer composition onto one or both sides of a layer including the plasticizer-containing polymer composition. Further, the invention provides a polymer composition which, when the plasticizer-containing polymer described above is a vinyl chloride-based polymer, can keep sufficient adhesive force after being adhered to a layer including such a vinyl chloride-based polymer, and also provides an adhesive product using the composition. The laminating acrylic thermoplastic polymer composition is a composition for lamination with a layer including a plasticizer-containing polymer composition. The acrylic thermoplastic polymer composition includes an acrylic block copolymer (I) including at least one polymer block (A) containing methacrylic acid ester units and at least one polymer block (B) containing acrylic acid ester units; and the acrylic acid ester units constituting the polymer block (B) in the acrylic block copolymer (I) include an acrylic acid ester (1) unit represented by the general formula CH2═CH—COOR1 (1) (wherein R1 is an organic group having 1 to 3 carbon atoms).