Linear Polyester Pheromone Membrane for Stable Carboxylic Acid Release
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Solution Overview
Problem
Existing sustained release pheromone preparations using polyolefin plastics face issues with high defect rates during manufacturing due to increased fluidity at high temperatures, leading to breakage and leakage, and lack biodegradability, particularly when containing carboxylic acid compounds.
Innovation Solution
A container made of linear aliphatic polyester with specific repeating units is used to enclose carboxylic acid compounds, ensuring a controlled release rate over a long period while reducing manufacturing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ethylene-vinyl acetate copolymer with high vinyl acetate content is used to increase carboxylic acid release rate, then release rate is improved, but manufacturing defects increase due to increased fluidity and decreased mechanical strength at processing temperatures
Solution Approach 1:
The patent changes the material parameter from ethylene-vinyl acetate copolymer to linear aliphatic polyester, which fundamentally alters the temperature-fluidity relationship. The new material maintains appropriate viscosity at processing temperatures while enabling carboxylic acid release, thus resolving the contradiction between release rate and manufacturing precision
Solution Approach 2:
The patent uses a composite approach by selecting a specific type of linear aliphatic polyester that combines the necessary properties: sufficient mechanical strength at processing temperatures to prevent manufacturing defects, while simultaneously allowing carboxylic acid compounds to pass through and be released effectively
2Ease of manufacture
If polyethylene is used as container material, then manufacturing ease and cost are improved, but carboxylic acid compounds are substantially not released
Solution Approach 1:
The patent changes the chemical parameter of the container material from polyethylene to linear aliphatic polyester. This material substitution maintains ease of manufacture and cost-effectiveness while fundamentally changing the permeability characteristics to enable carboxylic acid release, thus resolving the contradiction between manufacturing ease and release rate
3Ease of manufacture
If container material with low melting point and low flexural modulus is used, then processing is easier, but tearing occurs during ultrasonic sealing and continuous manufacturing
Solution Approach 1:
The patent changes the thermal and mechanical parameters of the container material by selecting linear aliphatic polyester with appropriate melting point and flexural modulus. The new material maintains processability while providing sufficient strength during ultrasonic sealing and continuous manufacturing, preventing tearing and ensuring container integrity
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 enables continuous production of pheromone preparations with low defect rates and maintains a high release amount of carboxylic acid sex pheromones throughout the adult pest outbreak period, with improved biodegradability.
Implementation Method 1
a sustained release pheromone preparation in which the sex pheromone is enclosed in a container such as a cap, tubule, laminated bag, or capsule made of a substance that can control the release rate
Data Source
AI summary
An aspect of the present invention provides a sustained release pheromone preparation comprising at least a carboxylic acid compound, the carboxylic acid compound being a sex pheromone; and a container having the carboxylic acid compound enclosed therein, wherein the container comprises, as at least a part of the container, a membrane of a linear aliphatic polyester having at least one selected from the following repeating unit (I):in which X and Y represent, independently of each other, a divalent hydrocarbon group having 1 to 8 carbon atoms.Another aspect of the present invention provides a method for controlling a pest, the method comprising at least a step of placing the aforesaid sustained release pheromone preparation in a field to release the aforesaid carboxylic acid compound from inside the sustained release pheromone preparation.