Organopolysiloxane resin, production method thereof, and curable organopolysiloxane resin composition using the same

摘要

Provided are an organopolysiloxane resin having a number average molecular weight of at least 500 and a silanol group content of at least 5 weight %, and comprising units of formula R.sup.1 SiO.sub.3/2, wherein R.sup.1 is a hydrogen atom or a monovalent substituted or unsubstituted hydrocarbon group having 1 to 18 carbon atoms, in a proportion of 30 to 100 mole %, the units of formula R.sup.1 SiO.sub.3/2 including 30-80 mole % of one silanol group-containing units of formula R. sup.1 Si(OH)O. sub. 2/2 ; a production method of the aforesaid organopolysiloxane resin; and a curable organopolysiloxane resin composition comprising the aforesaid organopolysiloxane resin.