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Chemically resistant, boron and alkali-free glasses

A technology of glass, silica, used in the field of primary packaging materials in the pharmaceutical industry

Inactive Publication Date: 2020-06-30
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a lack of a glass that combines desirable thermal expansion properties with comprehensive chemical resistance that also includes acid resistance

Method used

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  • Chemically resistant, boron and alkali-free glasses
  • Chemically resistant, boron and alkali-free glasses
  • Chemically resistant, boron and alkali-free glasses

Examples

Experimental program
Comparison scheme
Effect test

example 3

[0286] Example 3 contained too much wollastonite.

[0287] The properties obtained by calculation are:

[0288] Table 22

[0289]

[0290] For all cases, the calculated removal rates in the alkaline solution tests were too high. The calculated pH value of Example 1 is higher. (note: the above residue is 0.8% by weight of Na 2 O and K 2 O, given this, the calculated pH is even higher than 9.27 because Na 2 O and K 2 O can form a strong alkaline solution in aqueous solution. )

example 4

[0326] Example 4 contained too much anorthite.

[0327] The properties obtained by calculation are:

[0328] Table 32

[0329]

[0330] The removal rate calculated in the acid test was too high.

example 26

[0351] The anorthite content of Example 26 is negative, so Example 26 does not belong to the base system of the present invention. In contrast, Example 76 contained too much feldspar.

[0352] The properties obtained by calculation are:

[0353]

[0354] The calculated removal rates were too high for both the alkaline solution test and the acid test. pH was not calculated.

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Abstract

The present invention relates to glass and glass articles having good resistance to alkaline solutions and acids, and hydrolysis resistance, while also having a desired coefficient of thermal expansion. The manufacturing method and application of the glass also belong to the protection range of the invention. The glass can be used, for example, in the field of glass tubes, in particular drug tubesand lamp tubes, as well as fiber-reinforced plastic articles. The invention also relates in particular to a pharmaceutical packaging system having a chemically resistant glass, which is preferably particularly suitable as a primary packaging material in the pharmaceutical industry.

Description

technical field [0001] The present invention relates to glasses and glass articles which have good resistance to alkaline solutions and acids, and are resistant to hydrolysis, while also having a desired coefficient of thermal expansion. The manufacturing method and application of this glass also belong to the protection scope of the present invention. The glass can be used, for example, in the field of glass tubes, in particular drug tubes and lamp tubes, as well as fibre-reinforced plastic products. The invention also relates in particular to a pharmaceutical packaging system with chemically resistant glass, which is preferably particularly suitable as primary packaging material for the pharmaceutical industry. [0002] Such pharmaceutical packaging systems had to meet stringent requirements. In particular, the requirements for chemical resistance are high, that is to say good resistance to alkaline solutions and acids and good resistance to hydrolysis. Usually, a specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/04C03C6/02
CPCC03C1/00C03C3/087C03C4/20C03C3/085C03C2201/32C03C2201/42C03C2201/54
Inventor U·福瑟林汉姆P·纳斯S·特拉茨基S·M·里特R·艾希霍尔茨C·贝恩德豪瑟
Owner SCHOTT AG