LENS MATERIAL FOR OCULAR WEAR AND LENS FOR OCULAR WEAR

摘要

PROBLEM TO BE SOLVED: To obtain the subject lens material optically transparent, highly permeable to oxygen and improved in mechanical strength, by using water- nonswellable polyurethane consisting of silicone-containing component repeated units and specially skeletal benzene ring repeated units, and having a three- dimensional network structure at a specific urethane concentration. ;SOLUTION: This material comprises 10-60 wt.% of reated units expressed by formula I (R₁ and R₂ are each a 1-4C hydrocarbon, (d) is 4-30) and (B) 1.5-30 wt.% of repeated units expressed by formula II (X is CH₂, etc.; R₃ and R₄ are each H, etc.; R₅-R₁₂ are each H, etc.; (m) and (n) are each 0-5). The material has a three-dimensional network structure at a urethane binding concentration of 10-30%, and has destruction energy of ≥20 kgcmM and polyurethane which is practically non-swellable in water (water content absorbed is 8 wt.%, based on the total weight of the polyurethane) is used.;COPYRIGHT: (C)1999,JPO