DK129134C

1,233,638. Coating. FARBENFABRIKEN BAYER A.G. 17 Sept., 1969 [20 Sept., 1968], No. 45866/69. Addition to 1,201,279. Heading B2E. [Also in Division C3] Surfaces of metal, glass, ceramics, cement, wood and plastics are coated with an organopolysiloxane composition comprising (A) an α,#-dihydroxypoly- (diorganosiloxane) and (B) a nitrogen containing organosilicon compound [(RO 3 )SiCHR#] n NQ 3-n in which R is a C 1-4 alkyl radical, R' is a C 1-6 alkyl, cyclohexyl or phenyl radical, Q is C 2-4 alkenyl or alkyl, C 7-10 aralkyl, dimethylaminoalkyl (with C 2-4 alkylene chain), methoxy, ethoxyethyl or propyl. (A) may contain up to 10 molar % of CH 3 SiO3/ 2 units. (B) may be present at 2-25 % by wt. of (A). The composition may contain up to 135% of the wt. of (A) of a filler, e.g. SiO 2 , ZnO or CaCO 3 . There may also be present up to 50% by wt. of (A) of a α,#-bis(trimethylsiloxy)- poly(diorganosiloxane). A dialkyl tin carboxylate may also be present. Examples of (B) are [(C 2 H 5 O) 3 SiCH 2 ] 2 NCH 2 CH =CH 2 ; [(C 2 H 5 O) 3 SiCH 2 ] 2 N(CH 2 ) 3 CH 3 ; [(C 2 H 5 O) 3 SiCH 2 ] 2 NCH 2 CH 2 C 6 H 5 ; and [(C 2 H 5 O) 3 SiCH 2 ] 2 NCH 2 C 6 H 5 . The compositions cure to an elastic solid state on contact with water, e.g. atmospheric moisture at >50‹C.