Patent · US Active

Method of dividing glass into separate pieces with the aid of a cutting liquid and improved cutting liquid for said method

US8024943B2 · kind B2 · utility

0Cited by

8References

12Claims

0Family size

Assignee

Schott AG · DE

Inventors

Bernd Hoetzel · Wörrstadt, DE
Andreas Habeck · Undenheim, DE
Ortrud Perathoner · Stadecken-Elsheim, DE

Key dates

Filing date	May 15, 2006
Grant date	Sep 27, 2011
Priority date	—
Expiry date	Nov 30, 2029

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T83/0443
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The method of dividing a glass substrate into separate pieces includes producing a crack along a dividing line on the substrate and acting on the crack with an aqueous cutting liquid during or immediately after producing the crack. The aqueous cutting liquid used in the method has a special composition that reduces the breaking forces applied to the glass substrate in order to divide it. The aqueous liquid contains an ionic organic compound, which has a cation with a positively charged nitrogen atom and a hydroxyl anion. Quaternary ammonium hydroxide compounds are especially preferred as the ionic organic compound.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.