High impact poly (urethane urea) polysulfides
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Abstract
The present invention relates to a sulfur-containing polyureaurethane and a method of preparing said polyureaurethane. In an embodiment, the sulfur-containing polyureaurethane adapted to have a refractive index of at least 1.57,an Abbe number of at least 32 and a density of less than 1.3 grams/cm3, when at least partially cured.
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Citations
185 Claims
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1-151. -151. (canceled)
- 152. A sulfur-containing polyureaurethane adapted to have a refractive index of at least 1.57, an Abbe number of at least 32 and a density of less than 1.3 grams/cm3, when at least partially cured.
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174. A method of preparing a sulfur-containing polyureaurethane comprising:
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(a) reacting polyisothiocyanate or a mixture of polyisocyanate and polyisothiocyanate, and an active hydrogen-containing material to form polyurethane prepolymer; and
(b) reacting said polyurethane prepolymer with amine-containing curing agent, wherein the polyueaurethane is adapted to have a refractive index of at least 1.57, an Abbe number of at least 32 and a density of less than 1.3 grams/cm3. - View Dependent Claims (175, 176)
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177. A method of preparing a sulfur-containing polyureaurethane comprising:
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(a) reacting polyisocyanate with sulfur-containing active hydrogen-containing material to form polyurethane prepolymer; and
(b) reacting said polyurethane prepolymer with amine-containing curing agent, wherein said polyureaurethane is adapted to have a refractive index of at least 1.57, an Abbe number of at least 32 and a density of less than 1.3 grams/cm3. - View Dependent Claims (178, 179, 180)
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183. The optical article of claim 190 comprising at least a photochromic amount of photochromic substance.
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184. The optical article of claim 190, wherein the sulfur-containing polyureaurethane is prepared from a polyurethane prepolymer comprising the reaction product of:
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(a) polyisocyanate and/or polyisothiocyanate; and
(b) active hydrogen-containing material, with the proviso that at least one of (a) and (b) is sulfur-containing.
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185. A method of preparing a sulfur-containing polyureaurethane containing disulfide linkages comprising:
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(a) reacting polyisocyanate and/or polyisothiocyanate, with active hydrogen-containing material to form polyurethane prepolymer; and
(b) reacting said polyurethane prepolymer with amine-containing curing agent, wherein at least one of said polyurethane prepolymer and amine-containing curing agent comprises disulfide linkages.
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Specification