Modified Polyolefin Resin Adhesion and Solvent Stability
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Solution Overview
Problem
Chlorinated polyolefin resins face difficulties in dissolving in solvents with high polarity, such as ester and alcohol solvents, and have lower adhesion to polar substrates, particularly with alcohol solvents.
Innovation Solution
A modified polyolefin resin is developed by grafting a polymer with a specific hydroxyl value range onto a polyolefin resin, enhancing its adhesion to both polar and nonpolar substrates and stability in alcohol solvents, using a resin dispersion with a dispersing medium comprising 50% or higher alcohols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chlorinated polyolefin resin is used to enhance adhesion to polyolefin substrates, then adhesion to nonpolar substrates is improved, but solubility in high polarity solvents deteriorates
Solution Approach 1:
The resin molecule is designed with heterogeneous structure containing both polar and nonpolar regions. The chlorinated polyolefin backbone provides nonpolar character for substrate adhesion, while grafted polar groups (carboxylic acid, hydroxyl, amine, or isocyanate groups) provide polarity for solvent compatibility. This local differentiation of chemical properties within the same resin molecule resolves the contradiction between nonpolar substrate adhesion and polar solvent solubility.
Solution Approach 2:
The invention creates a composite resin structure by chemically combining chlorinated polyolefin (nonpolar component) with polar functional groups through grafting reactions. This composite molecular architecture integrates the advantageous properties of both polar and nonpolar materials, enabling simultaneous compatibility with polar solvents and adhesion to nonpolar substrates.
2Stability of the object's composition
If oxidized chlorinated polyolefin resin is used to improve solvent compatibility, then solubility in ester solvents is improved, but adhesion to polar substrates deteriorates
Solution Approach 1:
Instead of merely oxidizing the resin (which introduces limited polar groups), the invention systematically introduces various polar functional groups (carboxylic acid, hydroxyl, amine, isocyanate) through controlled grafting reactions. This parameter change in the degree and type of polarity enables optimization of both solvent compatibility and substrate adhesion, overcoming the limitations of simple oxidation.
3Reliability
If alcohol solvents are used to replace aromatic solvents for safety and cost reasons, then safety and cost are improved, but resin solubility deteriorates
Solution Approach 1:
The resin is engineered with specific polar functional groups (particularly hydroxyl and carboxylic acid groups) that form hydrogen bonds with alcohol solvent molecules. This local polarization at specific molecular sites enables compatibility with hydrogen-bonding alcohol solvents while maintaining the nonpolar chlorinated polyolefin backbone for substrate adhesion, thus resolving the solubility issue with safe, inexpensive alcohol solvents.
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 modified polyolefin resin exhibits excellent adhesion to nonpolar substrates like polyolefin substrates and maintains stability in alcohol solvents, improving compatibility and usability.
Implementation Method 1
a modified polyolefin resin in which the following polymer (A) is grafted on the following resin (B)
Data Source
AI summary
Provided is a modified polyolefin resin that is excellent in adhesion to nonpolar substrates such as a polyolefin substrate, and excellent in stability in an alcohol solvent. In the modified polyolefin resin, the following polymer (A) is grafted on the following resin (B). Polymer (A): a polymer including at least one constitutional unit selected from the group consisting of a constitutional unit derived from an α, β-unsaturated carboxylic acid and a constitutional unit derived from a derivative of an α, β-unsaturated carboxylic acid, and having a hydroxyl value in a range of 10 mgKOH/g or larger and 200 mgKOH/g or smaller. Resin (B): a polyolefin resin or a modified product thereof.