Film-forming polymers

A film-forming polymer functionalized with 1,2-dicarboxylic acid monoester groups, comprising an acid-labile, hydrolysis-stable polymer unit (A) of structure:

• a thermally stable polymer unit (B) of structure:
• a second thermally polymer unit (C) of structure
• and a polymer unit (D) bearing reactive groups and having a structure
• in which the amount of (A) is from 1 to 99 mol %, the amount of (B) is from 1 to 99 mol %, the amount of (C) is from 0 to 50 mol %, and the amount of (D) is from 0 to 50 mol %, provided that the amounts of (A), (B), (C), and (D) total 100 mol %;
• and in which
• n=0, 1, 2 or 3,
• R1 is a hydrocarbon radical which is bonded via a tertiary C atom to the O atom and having a total of 4 to 10 C atoms, or a 2-tetrahydrofuranyl or 2-tetrahydropyranyl radical, R2, R3 and R4—independently of one another—are C1- to C6- alkyl or C1- to C6- alkoxy, C6- to C18- aryl or C6- to C18- aryloxy or aralkyl having a C6- to C18- aryl group and a C1- to C4- alkylene radical,
• R5 is H or C1- to C6- alkyl,
• R6, R7, R8 and R9—independently of one another—are H, C1- to C6- alkyl, C6- to C18- aryl, halogen, CN, methoxyphenyl or a radical of structure
• where
• R15 is H, C1- to C6- alkyl, C6- to C18- aryl, CH2═CH—, CH2═CH—CH2—, or CH2═CH—CO—;
• R10 is H, C1- to C6- alkyl, C2- to C6- alkenyl, C6- to C18- aryl, halogen or halogen-substituted C1- to C6- alkyl;
• R11 and R12—independently of one another—are linear C1- to C18- alkyl;
• R13 and R14—independently of one another—are linear C1- to C18- alkyl or tert-butyl;
• X is Si or Sn, and
• Y is O or NH.