Heterotelechelic block copolymers and process for producing the same

A heterotelechelic block copolymer which is represented by formula by formula (I) below:

• ##STR50## wherein R.sup.1 and R.sup.2, combined with each other, denote C.sub.1-10 alkoxy, aryloxy or aryl-C.sub.1-3 alkloxy, or R.sup.1 and R.sup.2 independently denote ethylenedioxy (--O--CH(R')--CH.sub.2 --O--:
• therein R'denotes hydrogen atom or C.sub.1-6 alkyl) which may be substituted with C.sub.1-6 alky, or, combined with each other, denote oxy (.dbd.O),
• L denotes ##STR51## or .paren open-st.CH.sub.2 .paren close-st..sub.r wherein R.sup.3 and R.sup.4 independently denote hydrogen atom, C.sub.1-10 alkyl aryl or aryl-C.sub.1-3 alkyl, and r denotes an integer of 2-5,
• m denotes an integer of 2-10,000,
• n denotes an integer of 2-10,000,
• p denotes an integer of 1-5,
• q denotes an integer of 0-20,
• Z denotes, when q is 0 (zero), hydrogen atom, alkali metal, acetyl, acryloyl, methacryloyl, cinnamoyl, p-toluenesulfonyl, 2-mercaptopropionyl or 2-aminopropionyl, or allyl or vinylbenzyl, while, when q is an integer of 1-20, denoting C.sub.1-6 alkoxycarbonyl, carboxymercapto or amino.