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Phosphorous containing glass having anti-microbial efficacy

An anti-microbial and glass technology, used in biocides, animal repellents, plant growth regulators, etc., can solve problems such as silver ion reduction

Inactive Publication Date: 2016-09-07
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficacy of silver ions decreases under ambient conditions (eg, about 42% relative humidity and about 23°C)

Method used

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  • Phosphorous containing glass having anti-microbial efficacy
  • Phosphorous containing glass having anti-microbial efficacy
  • Phosphorous containing glass having anti-microbial efficacy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Example 1 The strength of five glass samples was tested using the ring-on-ring test. The five glass samples were all 1.0 mm thick glass plates made from Corning 5318 glass. For Comparative Example 1, the glass was obtained by using KNO 3 bath by a single-step ion exchange method. Samples 1 to 4 were obtained by first using KNO 3 Bath, reuse KNO 3 and AgNO 3 prepared by the two-step ion exchange method of the bath.

[0079] like figure 1 As shown, Comparative Example 1 prepared using a single-step ion exchange failed under a load of approximately 525 kg. Samples 1-4 prepared using two-step ion exchange containing Ag failed under loads ranging from about 250 Kg to about 475 Kg. Thus, these samples show that glasses made using the two-step ion exchange process can be made to have about the same strength as glasses made using the single-step ion exchange process. This was unexpected because it is generally believed that the Ag ion pair such as K + The replacement o...

Embodiment 2

[0081] Example 2 tested three glass samples for antimicrobial activity. All three glass samples were 1.0 mm thick plates of Corning 5318 glass. All three glass samples were tested in KNO at 420 °C 3 Ion exchange in molten salt bath for 2.5 hours. Subsequently, the three glass samples were subjected to a second ion exchange in an ion exchange bath containing Ag. Compare Sample 2 at 20% Ag and 80% KNO 3 ion exchange in an ion exchange bath. Sample 5 was ion exchanged in a 100% Ag / K ion exchange bath. Sample 6 was ion exchanged in a 100% Ag / K ion exchange bath.

[0082] like figure 2 As shown, comparative sample 2 has a log kill rate of about 1.4, sample 5 has a log kill rate of about 1.8, and sample 6 has a log kill rate of about 1.6. Thus, these glass samples show that the 100% Ag / K ion exchange bath provides better antimicrobial protection than the 20% Ag ion exchange bath at low relative humidity and temperature.

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Abstract

The invention relates to strengthened antimicrobial glass. The glass includes greater from about 50.0 mol.% to about 65.0 mol.% SiO<2>, about 14.0 mol.% to about 22.0 mol.% A1<2>O<3>, about 14.0 mol.% to about 22.0 mol.% R<2>O, wherein R is an alkali metal, and about 4.0 mol.% to 10.0 mol.% P<2>O<5>. The glass may have a compressive stress layer having a thickness of greater than or equal to about 20 [mu]m to less than or equal to about 60 [mu]m and having a compressive stress of greater than or equal to about 700 MPa. The glass may have an antimicrobial activity greater than or equal to about 1.0 log kill at about 23 DEG C and about 40.0% relative humidity. The invention further relates to a method for making the glass. The method may include obtaining a glass article, strengthening the glass article by contact with a first ion-exchange liquid, and contacting the glass article with second ion- exchange liquid comprising an antimicrobial agent.

Description

[0001] background [0002] Cross References to Related Applications [0003] This application claims priority under 35 U.S.C. § 119 to U.S. Provisional Application Serial No. 61 / 908828, filed November 26, 2013, the contents of which this application is based upon, which is hereby incorporated by reference in its entirety. [0004] field [0005] The invention relates to a phosphorus-containing glass with antimicrobial effect and a manufacturing method of the glass. In particular, the present invention relates to clear, chemically strengthened glass with antimicrobial properties, on which glass may have functional coatings that do not affect the antimicrobial efficacy of the glass. technical background [0006] More recently, the use of metallic silver particles and silver salts has been described in patent and technical literature as a means of imparting antimicrobial properties to various materials. Silver ions can interact with a large number of molecular processes in mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/30C03C21/00
CPCC03C3/097C03C4/00C03C17/30C03C21/002C03C21/005C03C2204/02Y10T428/315Y10T428/31612A01N59/00A01N59/16
Inventor D·C·布克班德N·F·博雷里M·J·德杰纳卡T·M·格罗斯
Owner CORNING INC