Tacky Agent Composition Using Polylactic Acid Monomers
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Solution Overview
Problem
Existing tacky agent compositions are difficult to produce inexpensively and efficiently while achieving enzymatic degradability, biodegradability, and tackiness, and they often require solvents and have high crosslinking densities that affect their properties.
Innovation Solution
A tacky agent-forming composition comprising a polylactic acid structure-including monofunctional (meth)acrylic monomer, polyfunctional (meth)acrylic monomer, and non-functional compound, with a content of the non-functional compound being 10% or more by mole, which is produced through a reaction of (meth)acrylic acid chloride and saturated fatty acid chloride with a polylactic acid structure-including diol, resulting in a cured product with enhanced enzymatic degradability and tackiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing biodegradable plastics are used to create a tacky agent, then biodegradability is achieved, but the physical properties are opposite to those of a tacky sheet (hard, melting point 50°C or higher)
Solution Approach 1:
The patent changes the molecular weight parameter of the polylactic acid component to 1,000 or higher, which fundamentally alters the physical properties of the cured product. This high molecular weight PLA provides both the required tackiness (softer, lower melting point) and maintains biodegradability, resolving the contradiction between hardness and biodegradability
Solution Approach 2:
The patent creates a composite material system combining high molecular weight polylactic acid with acrylic monomers and crosslinking agents. This composite approach allows the PLA to provide biodegradability and appropriate softness, while the acrylic components contribute to crosslinking and structural integrity, achieving both biodegradability and proper mechanical properties
2Strength
If a bulky group is introduced in a side chain to achieve stickiness as a physical property of a polymer, then tackiness is improved, but the production method becomes very complicated
Solution Approach 1:
The patent extracts the bulky group modification from the main polymer chain and relocates it to the side chain of the acrylic monomer component. This separation allows the polylactic acid backbone to maintain its simple, biodegradable structure while the acrylic side chains provide the necessary tackiness through their bulky groups, simplifying the overall production process
Solution Approach 2:
The patent segments the tacky agent composition into distinct functional components: high molecular weight polylactic acid for biodegradability and base structure, acrylic monomers for crosslinking and structural development, and crosslinking agents for network formation. This segmentation allows each component to be optimized independently and simplifies production compared to modifying the entire polymer chain
3Strength
If crosslinking density is increased to improve mechanical properties, then strength is improved, but enzymatic degradability is reduced
Solution Approach 1:
The patent carefully controls the crosslinking density parameter by using specific crosslinking agents and optimizing the curing conditions. This controlled crosslinking achieves sufficient mechanical strength while maintaining adequate porosity and accessibility for enzymes to degrade the polylactic acid components, resolving the contradiction between strength and degradability
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 composition allows for the convenient and cost-effective production of tacky agents with improved enzymatic degradability, biodegradability, and tackiness, reducing environmental impact by using biomass and minimizing solvent use.
Implementation Method 1
the tacky agent composition that has been degraded by an exo-type lipase
Implementation Method 2
degraded to water and carbon dioxide by the action of an enzyme
Implementation Method 3
biodegradable plastics are degraded to water and carbon dioxide by the action of an enzyme released by microorganisms
Data Source
AI summary
A tacky agent-forming composition includes a polylactic acid structure-including monofunctional (meth)acrylic monomer, a polylactic acid structure-including polyfunctional (meth)acrylic monomer, and a polylactic acid structure-including non-functional compound. A content of the polylactic acid structure-including non-functional compound is 10% by mole or more.