Patent ID: 8101704

Claim:
A continuous process for preparing polymers (A) having end groups of the formula (1) (R 1 ) a (R 2 ) 3-a Si—X—A— (1) comprising continuously reacting by polymer-analogous reaction of linear, branched or crosslinked compounds comprising units of the formula (2) (Y—) n R 4 (2) with compounds of the formula (3) (R 1 ) a (R 2 ) 3-a Si—X—B (3) where X is a divalent alkylene group optionally substituted by fluorine, chlorine, bromine, C 2 -C 6 alkoxyalkyl or cyano groups, has 1-10 carbon atoms, and is optionally interrupted by ether, ester or amine groups or a chemical bond, A is a divalent linking group selected from the group consisting of —(R 3 )N—CO—N(R 3 )—, —(R 3 )N—CO—O—, and —(R 3 )N—CO—S—, wherein B is an —N═C═O group and Y is a group selected from the group consisting of HO—, HS—, H(R 3 )N— and mixtures thereof, or R 1 is an optionally halogen-substituted hydrocarbon radical having 1-10 carbon atoms, R 2 is an alkoxy radical —OR 3 , acetoxy radical —O—CO—R 3 , oxime radical —O—N═C(R 3 ) 2 or amine radical —NH—R 3 , R 3 is hydrogen, a linear, cyclic or branched hydrocarbon radical which is optionally substituted by heteroatoms and has 1-18 carbon atoms, an alkyl radical which is interrupted by nonadjacent oxygen atoms and has 1-18 carbon atoms, an alkoxy radial —OR 5 or an acetoxy radical —O—CO—R 5 , R 4 is a linear, branched or crosslinked polymer radical, R 5 is hydrogen or a linear, cyclic or branched hydrocarbon radical which is optionally substituted by heteroatoms and has 1-18 carbon atoms, a is 0, 1, 2 or 3 and n is an integer of at least 1, wherein polymers (A) are prepared by reacting linear polymers of the formula (2) with isocyanatosilanes of the formula (3) and, in a second synthesis step, compounds of the formula (4) Z-R 7 (4) are added to deactivate silane monomers of the formula (3), where Z is a functional HO—, HS— or H(R 8 )N— group and 3 R 7 , R 8 are as defined for R 5 .