A novel polymer comprising a reaction product obtained by reacting an
organosilane compound with a boron compound. The polymer comprises a
reaction product obtained by reacting (a) an aminated silane compound
represented by the formula R.sub.4-n--Si--(OR').sub.n (wherein R
represents an aminated organic group; R' represents methyl, ethyl, or
propyl; and n is an integer of 1-3) with (b) at least one boron compound
selected from the group consisting of H.sub.3BO.sub.3 and B.sub.2O.sub.3,
the amount of the ingredient (b) being 0.02 mol or larger per mol of the
ingredient (a).