Part VII. Special applications II
New materials for contact lenses prepared from Si- and Ti-alkoxides by the sol-gel process

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Abstract

Methods of synthesizing materials for hard contact lenses were developed by hydrolysis and condensation of an epoxide substituted alkoxysilane and Ti-alkoxides. To enforce sufficient tensile strength, polymethacrylates were incorporated as linear crosslinking elements using a methacryloxy substituted alkoxysilane as a hook between the siliceous network and the polymer chain. The incorporation of titania led to dense monolithic products which could be cured only with some minor shrinkages. Good wettabilities [contact angles with water: (25 ± 5)°] are due to glycol groupings formed by the epoxide radicals. O2-permeabilities of P = (13 ± 1) × 10−11 ml O2 cm2 ml−1 s−1 mm Hg−1 result from the silicone-like

structure elements, where R denotes a silicon-carbon bound organofunctional radical.

References (12)

  • H Schmidt et al.

    Kieselsäureheteropolykondensate, Verfahren zu deren Herstellung und Verwendung bei der Züchtung lebender Zellen

    DOS 27 58414

    (1979)
  • H Schmidt et al.

    Kieselsäureheteropolykondensate, Verfahren zu deren Herstellung und deren Verwendung als Membranen und Adsorbentien

    DOS 27 58 415

    (1979)
  • H Scholze et al.

    Poröse Memoranen und Adsorbentien, Verfahren zu ihrer Herstellung und ihre Verwendung zur Stofftrennung

    DOS 29 25 969

    (1981)
  • H Scholze et al.

    Verfahren zum Verbinden von Substraten durch Heiβsiegeln

    DOS 30 11 761

    (1981)
  • H Schmidt et al.

    Abrasiv wirkende Mittel und deren Verwendung

    DOS 30 48 369

    (1982)
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