Patent ID: 11932570
Assignee: SCHOTT GLASS TECHNOLOGIES (SUZHOU) CO. LTD.
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 15:
16. A method for chemical toughening an ultrathin glass article without resultant Optical Orange Skin (OOS), comprising:
providing the ultrathin glass article that has a thickness of at most 0.07 mm;
immersing the ultrathin glass article into a bath of molten salt having a toughening temperature for a toughening time to form an ultrathin toughened glass article;
controlling a content of exchange ion impurities that originate from the ultrathin glass article in the bath of molten salt to be less than 5000 ppm with a selective absorber;
lifting the ultrathin toughened glass article out of the bath of molten salt;
selecting parameters so that a thickness of a residual salt layer attached to a surface of the ultrathin toughened glass article from the immersing is less than 9/10*t, wherein t is the thickness of the ultrathin glass article; and
cooling and cleaning the ultrathin toughened glass article,
wherein the immersing, controlling and lifting cause the ultrathin toughened glass article to have a surface compressive stress greater than 300 MPa without OOS.