Chloroprene Latex Composition With Dimer Control for Low Odor Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Chloroprene-based latex compositions using polyvinyl alcohol as an emulsifier suffer from lower storage stability and mechanical stability, often agglomerating under vibration or mechanical stress, and generate odors due to chloroprene dimers during polymerization.
Innovation Solution
A chloroprene-based latex composition containing specific amounts of chloroprene dimers and adjusted water content, along with monomer units from chloroprene and vinyl monomers with carboxyl groups, and optionally polyvinyl alcohol, to enhance stability and reduce odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyvinyl alcohol is used as an emulsifier to produce chloroprene-based latex composition, then excellent tackiness is achieved, but storage stability and mechanical stability deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters by introducing specific chloroprene dimer structures (formulas a, b, and c) and controlling their total content within 0.0400-0.1500 parts by mass per 100 parts of solid content. This parameter adjustment resolves the contradiction by maintaining the polyvinyl alcohol emulsifier for tackiness while limiting harmful dimers to improve storage stability.
2Strength
If polyvinyl alcohol is used as an emulsifier to produce chloroprene-based latex composition, then excellent tackiness is achieved, but mechanical stability deteriorates
Solution Approach 1:
The invention controls the content of specific chloroprene dimer structures (formulas a, b, and c) within a precise range of 0.0400-0.1500 parts by mass per 100 parts of solid content. This parameter control prevents excessive dimer formation that causes agglomeration under mechanical stress, thereby improving mechanical stability while preserving the tackiness provided by polyvinyl alcohol.
3Productivity
If chloroprene polymerization is performed, then chloroprene-based polymer is produced, but odor is generated due to chloroprene dimer formation
Solution Approach 1:
The invention converts the harmful effect of chloroprene dimer formation into a beneficial outcome by identifying and controlling specific dimer structures (formulas a, b, and c). By maintaining their total content within 0.0400-0.1500 parts by mass per 100 parts of solid content, the invention allows polymerization to proceed efficiently while minimizing odor generation from uncontrolled dimer byproducts.
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 achieves improved storage stability, mechanical stability, and reduced odor, with enhanced adhesive properties such as initial peel strength and water resistance.
Implementation Method 1
A chloroprene-based latex composition comprising a chloroprene-based polymer and water
Data Source
AI summary
A chloroprene-based latex composition that has little odor and is excellent in storage stability and mechanical stability, a method for producing the chloroprene-based latex composition, and an aqueous adhesive comprising the chloroprene-based latex composition are provided. According to the present invention, there is provided a chloroprene-based latex composition comprising a chloroprene-based polymer and water, wherein the chloroprene-based latex composition comprises at least one chloroprene dimer selected from a group consisting of a chloroprene dimer (a) represented by formula (a), a chloroprene dimer (b) represented by formula (b), and a chloroprene dimer (c) represented by formula (c), and when an amount of the water is adjusted to obtain the chloroprene-based latex composition having a solid content concentration of 50% by mass, a total content of the chloroprene dimer (a), the chloroprene dimer (b), and the chloroprene dimer (c) in the chloroprene-based latex composition having a solid content concentration of 50% by mass is 0.0400 to 0.1500 parts by mass with respect to 100 parts by mass of the chloroprene-based latex composition having a solid content concentration of 50% by mass.