Method for separating different polymeric spectacle lens materials in a mixture

A method combining physical dissolution, thiolysis, and alcoholysis effectively recycles mixed polymeric spectacle lens materials, addressing the challenge of recycling low-purity waste streams by separating and recovering valuable components.

WO2026008509A2PCT designated stage Publication Date: 2026-01-08CARL ZEISS VISION INTERNATIONAL GMBH
View PDF 6 Cites 0 Cited by

Patent Information

Application Number
PCT/EP2025/068368
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-04
Filing Date
2025-06-27
Publication Date
2026-01-08

Smart Images

  • Figure EP2025068368_08012026_PF_FP_ABST
    Figure EP2025068368_08012026_PF_FP_ABST
Patent Text Reader

Abstract

The invention provides a method (100) for separating different polymeric spectacle lens materials in a mixture comprising at least two different polymeric spectacle lens materials by separating at least one polymeric spectacle lens material of the at least two different polymeric spectacle lens materials by a physical dissolution step and / or by using their different chemical behavior, wherein the at least two different polymeric spectacle lens materials are selected from the group consisting of polyallyl carbonate, polyurea, polyurethane, polyurethane / polyurea, polycarbonate, polyepisulfide and polythiourethane. The invention further provides a method for separating at least one polythiourethane from a mixture comprising at least two different polythiourethanes by thiolysis.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Separation method for thiourethane resin and its application

    JP2023085102A

  • Method of producing thiourethane resin raw material and application thereof

    US20230365770A1

  • Monomer composition for synthesizing recycled plastic, preparation method thereof, recycled plastic, and molded product using the same

    US20230383089A1

  • Method for decomposition and recovery of polyurethane resin

    US6489373B2

  • Low temperature synthesis of carbonyl-containing molecules by depolymerization of bisphenol a-based polycarbonates

    WO2022218914A1