Sustained Release Pheromone Membrane Material

Solution Overview

Problem

Existing sustained release pheromone preparations using polyolefin containers fail to maintain the initial ratio of unsaturated aliphatic acetate compounds with one and two carbon-carbon double bonds due to differences in molecular energy, leading to inconsistent release rates and reduced effectiveness in insect pest control.

Innovation Solution

A sustained release pheromone preparation using a mixture of unsaturated aliphatic acetate compounds with one and two carbon-carbon double bonds, encapsulated in a container with a membrane made of linear aliphatic polyester, such as polybutylene succinate or polybutylene adipate succinate, to maintain a constant residual mass percentage of both compounds throughout the release period.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If polyolefin containers are used for sustained release pheromone preparations, then processability and stability are improved, but the release rate consistency of compounds with different numbers of double bonds deteriorates

Engineering Contradiction:

ImproveprocessabilityVSAvoidrelease rate consistency

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The patent changes the membrane material parameter from polyolefin to linear aliphatic polyester, which has different permeability characteristics. This material substitution resolves the contradiction by providing a membrane that allows compounds with one and two double bonds to permeate at consistent rates, maintaining composition stability while remaining manufacturable.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent specifies a linear aliphatic polyester composed of specific repeating units (I) and (II) with defined molar ratios. This composite material approach creates a membrane with optimized permeability properties that simultaneously achieves good processability and consistent release rates for different pheromone compounds.

Inventive Principle:

Principle #40Composite materials

2Reliability

If polyolefin containers are used for sustained release pheromone preparations, then stability is improved, but the molecular energy difference effect on permeability is not controlled, leading to ratio inconsistency

Engineering Contradiction:

ImprovestabilityVSAvoidcompound ratio consistency

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the membrane material parameter from polyolefin to linear aliphatic polyester, which has different permeability characteristics. This material substitution resolves the contradiction by providing a membrane that allows compounds with one and two double bonds to permeate at consistent rates, maintaining composition stability while remaining manufacturable.

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If sustained release preparations release compounds at different rates, then environmental degradation may occur, but pest control effectiveness deteriorates

Engineering Contradiction:

Improveenvironmental degradationVSAvoidpest control effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent changes the membrane material parameter from polyolefin to linear aliphatic polyester, which has different permeability characteristics. This material substitution resolves the contradiction by providing a membrane that allows compounds with one and two double bonds to permeate at consistent rates, maintaining composition stability while remaining manufacturable.

Inventive Principle:

Principle #35Parameter changes

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 preparation ensures consistent release of pheromone substances, effectively controlling insect pests by maintaining the desired ratio of compounds, thereby enhancing species-specific pest control over an extended period.

Implementation Method 1

a container containing the mixture therein and comprising a membrane of a linear aliphatic polyester... wherein the sustained release pheromone preparation allows the residual mass percentage of the unsaturated aliphatic acetate compound having one carbon-carbon double bond and the residual mass percentage of the unsaturated aliphatic acetate compound having two carbon-carbon double bonds to be almost the same as the total residual mass percentage throughout the effective operation period

Methodology Applied

Scientific EffectPermeation: Permeation

Data Source

PatentEP3888460B1Sustained release pheromone preparation and method for controlling insect pest using the same

Publication Date: 2026.04.01 SHIN ETSU CHEMICAL CO LTD

AI summary

There is provided a sustained release pheromone preparation including a mixture containing a first unsaturated aliphatic acetate compound having one carbon-carbon double bond and a second unsaturated aliphatic acetate compound having two carbon-carbon double bonds in a mass ratio of 0.5:99.5 to 99.5:0.5, each compound having the same total number of carbon atoms; and a container containing the mixture therein and including, as a part or whole of the container, a membrane of a linear aliphatic polyester containing one or more selected from the following repeating unit (I); wherein the preparation targets at at least one type of insect pest whose sex pheromone substances contains both of the first and second compounds, or targets at at least one type of insect pest whose sex pheromone substance contains one of them and at least one type of insect pest sex pheromone substance or substances contains the other or both of them.