Process for producing compositions crosslinkable to elastomers

A process for producing moisture curable compositions crosslinkable to elastomers, comprising:

• in a first step, providing a mixture comprising
• (1) at least one organopolysiloxane having at least two hydroxyl groups,
• (2) at least one alkoxysilane of the formula
• RSi(OR1)3 (I),
• and/or partial hydrolysates thereof,
• where R is a monovalent hydrocarbyl radical having 1 to 18 carbon atoms, and
• R1 is identical or different and is a monovalent hydrocarbyl radical having 1 to 8 carbon atoms, and
• (3) organosilicon compounds having at least one radical containing basic nitrogen and bonded via carbon to silicon,
• in a second step, adding to the mixture of the first step
• (4) at least one ketoximosilane of the formula
• R2Si(ON═CR32)3 (II)
• and/or their partial hydrolysates,
• where R2 is a monovalent hydrocarbyl radical having 1 to 18 carbon atoms, and
• R3 is identical or different and is a monovalent hydrocarbyl radical having 1 to 5 carbon atoms, in amounts of at most 1 wt %, based on the total weight of the composition,
• and optionally adding further alkoxysilanes (2) and/or their partial hydrolysates and optionally further organosilicon compounds (3) in the second step or optionally in a third step subsequent to the second step, and adding and mixing
• (5) condensation catalysts,
• optionally
• (6) fillers,
• optionally
• (7) adhesion promoters,
• optionally
• (8) plasticizers,
• optionally
• (9) stabilizers, and
• optionally
• (10) additives different from components (1)-(9), wherein in the third step, further alkoxysilanes (2) of the formula (I) and/or their partial hydrolysates and further organosilicon compounds (3) are added to the reaction mixture from the second step.