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Optically clear reinforced silicone elastomers of high optical refractive index and improved mechanical properties for use in intraocular lenses
Optically clear reinforced silicone elastomers of high optical refractive index and improved mechanical properties for use in intraocular lenses
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机译:用于眼内透镜的光学透明的高光学折射率增强有机硅弹性体,具有改进的机械性能
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摘要
Optically clear, reinforced cross-linked silicone elastomers of the invention contain 12 to 18 mol percent of aryl substituted siloxane units of the formula R4R5-SiO, end blockers containing siloxane units of the formula R1R2R3SiO.5, and dialkyl siloxane units of the formula R6R7-SiO. R1 and R2 are alkyl, aryl or substituted alkyl or substituted aryl groups, and R3 is an alkenyl group. R4 and R5 are phenyl or mono lower alkyl substituted phenyl groups. R6 and R7 are methyl or ethyl groups. The polymer has a degree of polymerization between 100 to 2000, and preferably approximately 250. The polymer also contains trimethyl silyl treated silica as a reinforcer in the weight ratio of approximately 15 to 45 parts of reinforcer to 100 parts of the polymer. After cross-linking, the polymer has properties of an optical refractive index which is at least 1.44, a type A durometer hardness of at least 35, tensile strength of at least 500 psi and tear strength of at least 20 pli. The foregoing properties render the cross-linked polymer especially suitable for forming the bodies of intraocular lenses.
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机译:本发明的光学透明的增强的交联有机硅弹性体包含12至18摩尔%的式R 4 Sub> R 5 Sub> -SiO的芳基取代的硅氧烷单元,端基嵌段包含式R 1 Sub> R 2 Sub> R 3 Sub> SiO .5 Sub>的硅氧烷单元和式二烷基硅氧烷单元R 6 Sub> R 7 Sub> -SiO。 R 1 Sub>和R 2 Sub>是烷基,芳基或取代的烷基或取代的芳基,并且R 3 Sub>是烯基。 R 4 Sub>和R 5 Sub>是苯基或单低级烷基取代的苯基。 R 6 Sub>和R 7 Sub>是甲基或乙基。该聚合物的聚合度为100至2000,优选为约250。该聚合物还包含三甲基甲硅烷基处理的二氧化硅作为增强剂,其相对于100份聚合物的重量比为约15至45份。交联后,该聚合物的光学折射率为至少1.44,A型硬度计硬度至少为35,抗张强度至少为500 psi,撕裂强度至少为20 pli。前述性质使得交联聚合物特别适合于形成人工晶状体。
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