Impact Modified Denture Base Compositions Using Liquid Rubber Modifiers
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Solution Overview
Problem
Conventional rubber impact modified PMMA acrylics for denture bases suffer from brittleness, color instability, increased manufacturing costs, and porosity issues, particularly in cold cure acrylics, which affect the durability and aesthetic properties of denture bases.
Innovation Solution
The development of rubber impact modified liquid compositions using core-shell rubber impact modifiers that swell and form colloids, allowing for improved mixing with polymer powders, reducing the need for expensive powders and minimizing porosity, while enhancing impact resistance and flexural toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rubber impact modified polymer powders are used to improve impact resistance, then fracture toughness is improved, but color stability deteriorates and manufacturing cost increases
Solution Approach 1:
The invention extracts the rubber impact modifier from the polymer powder form and places it in the liquid monomer form. Specifically, rubber particles are dispersed in the liquid monomer to form a homogeneous liquid composition, separating the impact modification function from the conventional powder system. This extraction resolves the color stability issue while maintaining impact resistance improvement.
Solution Approach 2:
The invention creates a composite liquid composition by combining liquid monomer, rubber particles (impact modifier), and crosslinking agent into a homogeneous mixture. This composite approach allows the rubber particles to be uniformly distributed in the liquid phase, providing impact resistance without the color instability problems associated with rubber-modified powders.
2Strength
If rubber impact modified polymer powders are used to improve impact resistance, then fracture toughness is improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts the rubber impact modifier from the expensive modified polymer powder and places it in the liquid monomer phase. This allows the use of standard polymer powder combined with dispersed rubber particles in liquid form, reducing material costs while maintaining impact resistance benefits.
Solution Approach 2:
The invention changes the physical state parameter of the rubber impact modifier from solid powder form to dispersed particles in liquid form. This parameter change enables easier mixing and more uniform distribution, simplifying the manufacturing process and reducing costs associated with handling and processing rubber-modified powders.
3Strength
If rubber impact modified polymer powders are used in cold cure acrylics, then impact resistance is improved, but mixing performance deteriorates and porosity increases
Solution Approach 1:
The invention extracts the rubber impact modifier from the powder phase and disperses it in the liquid monomer phase. This extraction creates a homogeneous liquid composition that mixes easily with polymer powder without trapping air bubbles, resolving the porosity and mixing performance issues while maintaining impact resistance.
Solution Approach 2:
The invention creates a homogeneous liquid composition by dispersing rubber particles uniformly throughout the liquid monomer before mixing with polymer powder. This homogeneity ensures consistent distribution of impact modifiers and eliminates air bubble entrapment, improving both mixing performance and reducing porosity in the final product.
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 novel liquid compositions result in denture bases with superior impact resistance, flexural toughness, and improved chemical and solvent resistance, maintaining aesthetic properties and reducing manufacturing costs.
Implementation Method 1
core-shell rubber impact modifiers that swell and form colloids
Implementation Method 2
core-shell rubber impact modifiers that swell and form colloids
Implementation Method 3
polymerizable liquid compositions comprising rubber impact modifiers, monomers, and multifunctional crosslinking monomers or oligomers for said monomers
Data Source
AI summary
The present invention provides a composition including at least one polymerizabie liquid component having at least one rubber impact modifier; at least one polymerization initiator, and at least one polymer component.