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/cm 3 , when at least partially cured.
Abstract:
Polymerizable compositions are described comprising: (a) a mixture of thio(meth)acrylate functional monomers comprising: (a)(i) a first thio(meth)acrylate functional monomer, e.g., bis(thiomethacrylate)-1,2-ethylene; and (a)(ii) a second thio(meth)acrylate functional monomer, which is chain extended; (b) an aromatic monomer having at least two vinyl groups, e.g., divinyl benzene; (c) a polythiol monomer having at least two thiol groups, e.g., pentaerythritol tetrakis(3-mercaptopropionate); and (d) a comonomer selected from: (d)(i) an anhydride monomer having at least one ethylenically unsaturated group, e.g., methacrylic anhydride; (d)(ii) a monomer having at least three (meth)acryloyl groups, e.g., pentaerythritol tetrakis(acrylate); and (d)(iii) mixtures of monomers (d)(i) and (d)(ii). A polymerizate of the polymerizable composition has a refractive index of at least 1.57 and an Abbe number of at least 33.
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/cm 3 , when at least partially cured.
Abstract:
The present invention relates to a sulfur-containing polyureaurethane and a method of preparing said polyureaurethane. In an embodiment, the sulfur-containing polyureaurethane when at least partially cured can have a refractive index of at least 1.57,an Abbe number of at least 35 and a density of less than 1.3 grams/cm3. Further, the sulfur-containing polyureaurethane can be prepared by reacting a polyureaurethane prepolymer comprising a polycyanate and at least one hydrogen-containing material, at least one episulfide-containing material; and an amine-containing curing agent.
Abstract:
Polymerizable compositions are described comprising: (a) a mixture of thio(meth)acrylate functional monomers comprising, (a) (i) a first thio(meth)acrylate functional monomer, e.g., bis(thiomethacrylate)-1,2-ethylene, and (a) (ii) a second thio(meth)acrylate functional monomer, which is chain extended; and (b) a radically polymerizable comonomer having at least two (meth)acryloyl groups selected from, for example, (b) (i) ethoxylated bisphenol A dimethacrylate, (b) (ii) poly(ethylene glycol) dimethacrylate, (b) (iii) trimethylolpropane trimethacrylate, and (b)(iv) mixtures of monomers (b) (i), (b) (ii) and (b) (iii). Polymerizates of the polymerizable composition have a refractive index of at least 1.57 and an Abbe number of at least 33.