Novel monomers of the general formula ##STR1## where b is 0 or 1, a is 1, 2, 3 or 4, R.sup.2 is a monovalent alkyl radical and R is an organic radical. The novel monomers may be employed to produce novel copolymers useful as hydrogel, soft non-hydrogel and/or rigid gas permeable contact lens materials.
通式为##STR1##的新型单体,其中b为0或1,a为1、2、3或4,R.sup.2为单价的烷基基团,R为有机基团。这些新型单体可用于生产新型共聚物,用作
水凝胶、软性非
水凝胶和/或硬性气体透过性隐形眼镜材料。