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AssigneePPG Industries Ohio, Inc.
InventorsBarry R. Havens, Darrin R. Dabideen, Matthew S. Luchansky, Nigel D. Kidder-Wolff
Estimating the term…
A method of preparing a low bubbling and low yellowing, high refractive index polyurethane or polythiourethane is provided. A method of evaluating an aromatic polyiso(thio)cyanate material, such as an aromatic diisocyanate, e.g., m-xylylene cyanate, is provided. The method evaluates transmittance in a sample of the isocyanate to determine if the aromatic polyiso(thio)cyanate material will lead to unacceptable bubbling or yellowing in a high refractive index or high Abbe number polymer composition.
A method of preparing a polymer composition, comprising polymerizing a polymerizable composition comprising a mixture of an aromatic polyiso(thio)cyanate material and at least one polyol or a polythiol, wherein percent transmittance (% T) of the aromatic polyiso(thio)cyanate material used to prepare the polymerizable composition is measured at a wavelength of 310 nm±2 nm, and the aromatic polyiso(thio)cyanate material added to the mixture has at least 35 percent transmittance (% T), at least 40% T, or at least 50% T at a wavelength of 310 nm in a quartz cuvette with an optical path of one centimeter, calibrated to water having a unit % T of 100%, and optionally at least 60% T at a wavelength of 320 nm in a quartz cuvette with an optical path of one centimeter, calibrated to water having a unit % T of 100%, and measured at a wavelength of 320 nm±2 nm.
(canceled)
A polymerizable composition for use in preparing a polymer composition comprising a mixture of an aromatic polyiso(thio)cyanate composition and a polyol or a polythiol compound, wherein the transmittance of the polyiso(thio)cyanate composition used to prepare the mixture is determined at a wavelength of 310 nm±2 nm, and the aromatic polyiso(thio)cyanate composition added to the polymerizable composition has at least 35 percent transmittance (% T), at least 40% T, or at least 50% T, at a wavelength of 310 nm in a quartz cuvette with an optical path of one centimeter, calibrated to water having a unit % T of 100%, and optionally at least 60% T at a wavelength of 320 nm in a quartz cuvette with an optical path of one centimeter, calibrated to water having a unit % T of 100%, and measured at a wavelength of 320 nm±2 nm.
A method of identifying a batch of an aromatic polyiso(thio)cyanate material that produces a low bubble and/or low Yellowness Index (ASTM Method E313), high refractive index optical article when polymerized in a polymerizable composition with a polyol or a polythiol, comprising:
Dependencies are inferred from the claim text.