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Photocurable compositions

  • US 8,097,399 B2
  • Filed: 03/21/2005
  • Issued: 01/17/2012
  • Est. Priority Date: 03/22/2004
  • Status: Active Grant
First Claim
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1. An optical moulding composition comprising, in weight percent:

  • (a) at least two curable components;

    (i) a first component in an amount of at least 80%, based on the total weight of the curable components in the composition, the first component comprising an acrylate and an acid amplified system comprising at least one cationically photocurable material, a cationic photocuring initiator, and an acid amplifier, the first component being photocurable and such that, when cured in the presence of a photocuring initiator by exposure to UV radiation having an energy of 30 mJ/cm2, at least 90% by weight of the first component is cured within 50 milliseconds, and(ii) a curable second component in an amount of at least 5% and at most 15% by weight of the total curable components in the composition, the second component being a compound having at least one terminal thiol group;

    (b) 0.01 to 10%, by weight, of a radical photoinitiator,(c) 0.001 to 5% by weight of a stabilizer, and(d) 0 to 20% by weight of auxiliary materials.

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