Cyclic Acid-Modified Polyolefin Dispersion for Stable Aqueous Coatings
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Solution Overview
Problem
Existing aqueous resin compositions using high water solubility solvents struggle to achieve adequate dispersion stability of acid-modified polyolefin resins with high molecular weight and low acid modification degree, leading to poor adhesion and chemical resistance in coating films.
Innovation Solution
A dispersion resin composition is developed using a modified polyolefin resin with a degree of ring opening of 70 or more, achieved by introducing an α,β-unsaturated carboxylic acid derivative with a ring structure, and an aqueous dispersion medium, while reducing the amount of emulsifier to less than 10% by weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acid-modified polyolefin resins with high molecular weight and low acid modification degree are used to obtain adhesive layers with excellent adhesion, water resistance, and chemical resistance, then coating performance is improved, but dispersion stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the modification component from conventional linear unsaturated carboxylic acids to cyclic unsaturated carboxylic acids (such as cyclohexane carboxylic acid). This parameter change in the molecular structure enables the resin to maintain both high molecular weight with low acid modification degree for excellent coating performance and adequate dispersion stability through the cyclic structure's unique properties.
2Stability of the object's composition
If emulsifiers are used to achieve adequate dispersion stability of acid-modified polyolefin resins, then dispersion stability is improved, but emulsifier bleeding onto the coating film surface occurs, leading to appearance failure
Solution Approach 1:
The patent extracts and eliminates the emulsifier component from the composition by using cyclic unsaturated carboxylic acid-modified polyolefin resins that inherently provide adequate dispersion stability through their molecular structure, thereby preventing emulsifier bleeding onto the coating film surface.
Solution Approach 2:
The cyclic unsaturated carboxylic acid-modified polyolefin resin serves its own dispersion function through its molecular structure, eliminating the need for separate emulsifier additives. The resin's inherent properties provide both dispersion stability and prevent surface bleeding.
3Object-generated harmful factors
If solvents with high water solubility are used to produce aqueous dispersion without emulsifiers, then emulsifier bleeding is prevented, but dispersion stability of high molecular weight resins with low acid modification degree is insufficient
Solution Approach 1:
The patent changes the fundamental parameter of the modification component from linear to cyclic structure, which fundamentally alters the resin's interaction with water and dispersion medium. This structural parameter change enables high molecular weight resins with low acid modification degree to achieve adequate dispersion stability without relying on high water solubility solvents or emulsifiers.
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 maintains dispersion stability and enhances adhesion and chemical resistance in coating films, even with reduced emulsifier use, by leveraging electrostatic repulsion forces from carboxylic acid ions.
Implementation Method 1
leveraging electrostatic repulsion forces from carboxylic acid ions
Data Source
AI summary
An object is to provide a dispersion resin composition which can maintain dispersion stability even if the added amount of an emulsifier is reduced. Provided is a dispersion resin composition including, at least: a modified polyolefin resin in which a modification component containing an α,β-unsaturated carboxylic acid derivative with a ring structure has been introduced to a polyolefin resin; and an aqueous dispersion medium, wherein the modified polyolefin resin has a degree of ring opening, represented by the equation (1), of 70 or more:degree of ring opening=modification degree K×rate of ring opening R (1)(in the equation (1), the modification degree K represents a containing rate (% by weight) of the α,β-unsaturated carboxylic acid derivative relative to the polyolefin resin, and the rate of ring opening R represents a rate of ring opening (%) of the ring structure in the α,β-unsaturated carboxylic acid derivative).