Acrylic Copolymer Process Aid for Filled PVC Composites
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Solution Overview
Problem
Highly filled polyvinyl chloride (PVC) composites, used in flooring, siding, and pipes, face processing difficulties due to high filler levels, often requiring expensive vinyl copolymers, and existing acrylic copolymer process aids with high methyl methacrylate units do not effectively improve fusion times and processing efficiency.
Innovation Solution
An acrylic copolymer process aid comprising 50-79 weight percent methyl methacrylate units and 20-50 weight percent of another acrylic monomer, with a glass transition temperature (Tg) less than 90°C, is used in PVC and chlorinated PVC composites, improving fusion speed and reducing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high levels of filler (75-90 wt%) are used in PVC composites to reduce costs, then material cost is reduced, but processing difficulty increases and expensive vinyl copolymers are required
Solution Approach 1:
The patent changes the chemical composition parameters of the copolymer process aid, specifically using 80 wt% or less methyl methacrylate units (unlike conventional high-MMA copolymers) and controlling the Tg to be 90°C or less. This parameter change enables effective processing of highly filled PVC composites without requiring expensive vinyl copolymers, thus resolving the contradiction between high filler content and processing ease.
Solution Approach 2:
The patent replaces expensive vinyl copolymers with a more cost-effective acrylic copolymer process aid having specific compositional parameters (≤80 wt% MMA units and Tg ≤90°C). This substitution achieves the same processing function at lower cost, making high filler content economically viable without compromising manufacturability.
2Ease of manufacture
If conventional acrylic copolymers with high methyl methacrylate units are used as process aids, then cost is reduced compared to vinyl copolymers, but fusion time and processing efficiency are not sufficiently improved
Solution Approach 1:
The patent optimizes two critical parameters of the acrylic copolymer: (1) methyl methacrylate unit content set at 80 wt% or less (balancing cost and performance), and (2) glass transition temperature controlled at 90°C or less (enhancing processing efficiency). This dual parameter optimization achieves both cost-effectiveness and improved fusion speed, resolving the contradiction between cost and productivity.
Solution Approach 2:
The patent introduces dynamic adaptability in the copolymer structure by specifying a Tg range (≤90°C) that allows the process aid to exhibit optimal viscoelastic properties during processing. This dynamic characteristic enables the copolymer to effectively facilitate fusion and improve processing efficiency while maintaining cost advantages over vinyl copolymers.
3Productivity
If vinyl copolymers are used to process highly filled PVC composites, then processing efficiency is improved, but material cost increases significantly
Solution Approach 1:
The patent substitutes expensive vinyl copolymers with a cost-effective acrylic copolymer process aid having specific compositional parameters (≤80 wt% MMA units and Tg ≤90°C). This replacement maintains processing efficiency while significantly reducing material cost, thus resolving the contradiction between productivity and material cost.
Solution Approach 2:
The patent changes the chemical composition parameters of the process aid from vinyl-based to acrylic-based with controlled MMA content (≤80 wt%) and Tg (≤90°C). This parameter change achieves comparable processing efficiency to vinyl copolymers at lower cost, eliminating the need to sacrifice productivity for cost reduction.
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 acrylic copolymer process aid enhances the processing efficiency of highly filled PVC and CPVC composites by achieving faster fusion and lower processing times, making the production more cost-effective and efficient.
Implementation Method 1
The acrylic copolymer additive contains from 50 to 79 weight percent of methyl methacrylate monomer units, and has a Tg of less than 90° C.
Implementation Method 2
The PVC/CPVC composites of the invention show a faster fusion, and a lower time to hand.
Data Source
AI summary
The invention relates to an acrylic copolymer additive useful as a process aid in highly filled polyvinyl chloride (PVC) and chlorinated polyvinyl chloride (CPVC) composites. The acrylic additive is especially useful in highly filled PVC flooring tiles, rolled flooring, pipe and siding. The acrylic copolymer additive contains from 50 to 79 weight percent of methyl methacrylate monomer units, and has a Tg of less than 90° C.