Liquid monofunctional 1,3-dioxolane copolymers

1,3-Dioxolane copolymers, comprising:

• wherein the 1,3-Dioxolane copolymers have a general formula I
• wherein x1+x2 has values of 10 to 2000;
• wherein R1 and R2 are hydrogen radicals or C1 to C18 alkyl radical, wherein in each case at least one radical R1 or R2 in the units [O—CH2—O—CHR1—CHR2-]y1 and [0-CHR1—CHR2O—CH2-]y2 is a C1 to C18 alkyl radical;
• wherein y1+y2 has values of 3*(x1+x2+y1+y2)/100 to 50*(x1+x2+y1+y2)/100;
• wherein R3 is an aliphatically saturated or unsaturated hydrocarbon radical which is unsubstituted or substituted by halogen atoms, amino groups, C1-6 alkyl, C1-6 alkoxy or silyl groups and has 1 to 100 carbon atoms, in which one or more mutually non-adjacent —CH2 units may be replaced by —O—, —S—, C═O, —O—C(O)— or —NR4— groups and in which one or more mutually non-adjacent ═CH units may be replaced by —N═ groups;
• and
• wherein R4 is a hydrogen radical or C1 to C18 alkyl radical.

A process for producing 1,3-dioxolane copolymers, comprising:

• providing 1,3-dioxolane copolymers having the general formula I
• wherein x1+x2 has values of 10 to 2000,
• wherein R1 and R2 are hydrogen radicals or C1 to C18 alkyl radical, where in each case at least one radical R1 or R2 in the units [O—CH2—O—CHR1—CHR2-]y1 and [O—CHR1—CHR2O—CH2-]y2 is a C1 to C18 alkyl radical,
• wherein y1+y2 has values of 3*(x1+x2+y1+y2)/100 to 50*(x1+x2+y1+y2)/100,
• wherein R3 is an aliphatically saturated or unsaturated hydrocarbon radical which is unsubstituted or substituted by halogen atoms, amino groups, C1-6 alkyl, C1-6 alkoxy or silyl groups and has 1 to 100 carbon atoms, in which one or more mutually non-adjacent —CH2 units may be replaced by —O—, —S—, C═O, —O—C(O)— or —NR4— groups and in which one or more mutually non-adjacent=CH units may be replaced by —N═ groups, and
• wherein R4 is a hydrogen radical or C1 to C18 alkyl radical;
• and
• copolymerizing the 1,3-dioxolane copolymers with an alkyl-substituted 1,3-dioxolane of the general formula II
• in the presence of a Lewis or Brønsted acid and an alcohol of the general formula R3OH, where the molar ratio of Lewis or Brønsted acid to alcohol of the general formula R3OH is less than 1.