Oxygen-permeable hard contact lens prodn.

摘要

O2-Permeable hard contact lens is prepd. from a copolymer contg. (a) an organosilane or organosiloxane cpd. contg. in one mol., at least one acrylate or methacrylate gp. having formula CH2=CR1-COO-(-CH2CHOHCH2O-)k-(CH2)l- (I) (where R1 is H or Me; k is 0 or 1 and l is 1 or 3) and no more than 16 Si atoms, and (b) a fluoroalkyl acrylate or methacrylate having formula CH2=CR1-COO-(-CH2CHOHCH2-)m-(CnH2n-)-Rf (II) (where m is 0 or 1; n is 0 or integer 1-3 and Rf is linear or branched fluoroalkyl contg. 2-21 F atoms). In addn. to improve O2-permeability, the lenses have improved impact-strength, hardness, rigidity and dimensional stability resulting in constant optical properties.