Silicone hydrogel composition and silicone hydrogel contact lenses made from the composition

A silicone hydrogel composition, comprising:

• at least one silicone macromer in the amount of 5 to 50 wt % based on the total weight of the composition, wherein the silicone macromer has a structure of chemical formula (1):
• wherein X is a secondary amino group (—NH—) or an oxygen atom;
• Y is a secondary amino group (—NH—) or an oxygen atom;
• at least one of X and Y is a secondary amino group (—NH—);
• R1 is a hydrogen atom or a methyl group;
• R2 is a C1-C12 alkyl group;
• m is an integer from 2 to 4;
• n is an integer from 2 to 4;
• p is an integer from 0 to 4;
• q is an integer from 2 to 4;
• and k is an integer which makes the number average molecular weight (Mn) of the silicone macromer in the range of 600 to 3000;
• a hydroxy-functionalized silicone-containing monomer in the amount of 5 to 50 wt % based on the total weight of the composition, wherein the hydroxy-functionalized silicone-containing monomer has a structure of chemical formula (2):
• wherein J is a hydrogen atom or a methyl group;
• r is an integer from 2 to 10;
• K1, K2 and K3 are each a methyl group or a trimethylsiloxy (—OSi(CH3)3) in which at least one K1, K2 and K3 is a methyl group or one trimethylsiloxy (—OSi(CH3)3);
• a first hydrophilic monomer in the amount of 30 to 60 wt % based on the total weight of the composition, wherein the first hydrophilic monomer is N-vinyl pyrrolidone, and the silicone macromer, the hydroxy-functionalized silicone-containing monomer or a combination thereof are mutually soluble with N-vinylpyrrolidone;
• and
• at least one crosslinker in the amount of less than 20 wt % based on the total weight of the composition.