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Method for manufacturing antimicrobial acrylic materials

An antimicrobial, acrylic technology, used in botanical equipment and methods, biocides, animal repellants, etc., to solve problems such as insufficient proof color stability

Inactive Publication Date: 2013-10-09
EVONIK ROEHM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, supporting data are insufficient to demonstrate the high standards of color stability required for optical material grades

Method used

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  • Method for manufacturing antimicrobial acrylic materials
  • Method for manufacturing antimicrobial acrylic materials
  • Method for manufacturing antimicrobial acrylic materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085]Table 2 shows the antimicrobial activity of some of the above base resins containing 1.5% by weight silver-based antimicrobial glass frit. In all examples, antimicrobial activity was measured according to JIS Z2801 and calculated as: [log(B / A)−log(C / A)]=[log(B / C)], where:

[0086] A = average number of viable bacterial cells immediately after inoculation of untreated specimens

[0087] B = mean number of viable cells of bacteria on untreated specimens after 24 hours; and

[0088] C = mean number of viable cells of bacteria on antimicrobial coupons after 24 hours.

[0089] Table 2

[0090]

Embodiment 2

[0092] Table 3 shows the loading effect of antimicrobial additives. Loadings are expressed as wt % active ingredient, based on the total weight of the composition. All samples used in G20 – Silver-based antimicrobial glass powder in HiFlo.

[0093] table 3

[0094]

[0095] *=Only for different sample groups tested by JIS Z 2801. Inoculation at 0, 24 hours, 48 ​​hours and 72 hours. Viable count reading after 96 hours.

[0096] As seen, the performance depends on the loading of antimicrobial additives. Optical properties and silver ion release rates were measured on 1 / 8" thick 2" x 3" injection molded sections. Silver ion release rates and antimicrobial activity correlated well with additive loading. Most compositions showed strong antimicrobial effects, Termination rates exceeded 6 orders of magnitude (R > 6.0) for both organisms tested. figure 1 The effect of additive loading on silver release rate is shown. Sufficient silver should be present so that the rate of ...

Embodiment 3

[0098] Table 4 shows the effect of moisture. All samples were at 2.5% loading.

[0099] Table 4

[0100]

[0101] Control sample = no dilution of 0% Ionpure resin

[0102] As seen, moisture content during extrusion can significantly affect product properties. Losses in silver release rates of up to 17% have been recorded, depending on moisture content and melt pool temperature.

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Abstract

Acrylic materials with antimicrobial activity are tumble blended, melted and extruded through an extruder. The resulting polymer compounds include an acrylic resin, such as methylmethacrylate polymers, copolymers and multipolymers, and blends thereof, silver-containing antimicrobial additives; and optional additives such as impact modifiers, flow promoters, stabilizers and coloring agents. The properties of the acrylic materials, especially the antimicrobial performance, are strongly dependent on the manufacturing process conditions, including feed resins pre-drying, residual moisture content, screw speed and melt temperature. The materials composition and manufacturing procedures are equally significant.

Description

technical field [0001] Disclosed herein are methods of making acrylic compounds exhibiting antimicrobial activity and articles thereof, such as sheets, films, rods, pipes, and other extruded profiles and / or downstream articles. The method uses acrylic resins based on acrylic resins (standard and impact modified acrylic resins, including multi-polymer resins and polymer blends) with silver-containing antimicrobial additives and optional components such as flow promoters, Compositions of stabilizers, colorants, etc. More specifically, processing conditions for enhanced antimicrobial performance and enhanced optical performance are disclosed. The antimicrobial resins and downstream articles can be used in a variety of applications, including medical and consumer applications. Background technique [0002] Acrylics are widely used in consumer and medical applications. Acrylic polymers provide transparent or translucent durable product characteristics with desirable appearance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/00C08K5/00C08L33/06
CPCC08K5/0058C08L33/08C08K3/005A01N59/16C08K3/015C08L33/06C08L33/04C08J3/20C08K3/00C08K5/00
Inventor D·K·迪莫夫L·N·盖布里埃尔F·里昂C·R·斯潘P·D·科尔伯恩T·C·施密特朱珍
Owner EVONIK ROEHM GMBH
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