MÉTODO PARA FORMAR POLIURETANOS TERMOPLÁSTICOS EM UMA LENTE ÓPTICA, E, LENTE OFTÁLMICA

MÉTODO PARA FORMAR POLIURETANOS TERMOPLÁSTICOS EM UMA LENTE ÓPTICA, E, LENTE OFTÁLMICA

A method of forming thermoplastic polyurethane (TPU) into an optical lens. Suitable TPUs contain urethane (-NHCOO-) repeating units that are present in at least 23% by weight. This range of urethane weights is an indicator of a flexural modulus above 1,400 MPa. The TPUs have refractive indices above...

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Hauptverfasser: HAO-WEN CHIU, LEANIRITH YEAN, ROGER A. MAYR
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Sprache:por
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PERFORMING OPERATIONS
PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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creator HAO-WEN CHIU
LEANIRITH YEAN
ROGER A. MAYR
description A method of forming thermoplastic polyurethane (TPU) into an optical lens. Suitable TPUs contain urethane (-NHCOO-) repeating units that are present in at least 23% by weight. This range of urethane weights is an indicator of a flexural modulus above 1,400 MPa. The TPUs have refractive indices above 1.54 and Abbe numbers above 27. They have glass transition temperatures above about 100 degrees C. The selected TPU can be injection molded to form ophthalmic lenses, that are well suited for use in rimless spectacles. The lenses are highly solvent resistant, while at the same time being readily tintable. The lenses made according the invention meet FDA 21 CFR 801.41 Impact Requirement, and ANSI Z87.1 high velocity impact (HVI) standard.
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subjects PERFORMING OPERATIONS
PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE
TRANSPORTING
WORKING OF PLASTICS
WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
title MÉTODO PARA FORMAR POLIURETANOS TERMOPLÁSTICOS EM UMA LENTE ÓPTICA, E, LENTE OFTÁLMICA
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