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US 6,309,585 B1Granted
Curable casting compositions having a high refractive index and high impact resistance
AssigneeRodenstock North America, Inc.
InventorQiang Zheng
Life of this patent
Estimating the term…
Abstract
A high refractive index composition comprising a core resin mixture comprising a mixture of ethoxylated bisphenol A di(meth)acrylates and/or their derivatives having variable degrees of ethoxylation to provide enhanced impact resistance and refractive index.
Claims41
A high refractive index composition consisting essentially of:
- a core resin mixture comprising
- (i) a first compound having the formula (I):
- wherein n is from 0-30, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH═CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl,
- (ii) a second compound having the formula (II):
- wherein m is from 1-30, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH═CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl, and
- (iii) a reactive diluent comprising 1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobomyl (meth)acrylate vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene or a mixture thereof, the mixture having greater than 70 parts by weight of the composition of the combined components (i) and (ii), and less than 30 parts by weight of the composition of component
- (iii), based on the total parts by weight of the core resin equaling 100, and n is less than m so as provide a refractive index of greater than 1.53 and a high impact resistance after curing the composition.
4 more elements
A high refractive index composition consisting essentially of:
- (a) a core resine comprising
- great than 70 parts by weight of the composition of a first compound or a mixture comprising two or more first compounds, wherein the first compound has the formula (I):
- wherein n is from 0-30, R1-R4 independently represent H or C1-C6 alkyl, X is O, S, SO2, CO2, CH2, CH═CH, C(CH3)2 or a single bond, and y1-y8 independently represent H, OH, halogen, mercaptan or C1-C4 alkyl,
- (ii) less than 30 parts by weight of the composition of a reactive diluent comprising 1,6-hexanedi ol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, isobornyl (meth)acrylate, vinyl benzoate, vinyl 4-t-butyl benzoate, styrene, divinyl benzene or a mixture thereof, based on the total parts by weight of the core resin equaling 100;
- and
- (b) up to 2 parts by weight of an ultraviolet absorber per 100 parts by weight of the core resin.
3 more elements
Dependencies are inferred from the claim text.