Copolymer containing acid building blocks and various types of polyether building blocks

A copolymer comprising:

• i) 3 to 40 mol % of an isoprenolpolyether derivative structural unit α
• ii) 3 to 40 mol % of a vinyloxypolyether derivative structural unit β and
• iii) 35 to 93 mol % of an acid structural unit γ,
• the isoprenolpolyether derivative structural unit α being represented by the following general formula (Ia)
• where
• A are identical or different and are represented by an alkylene group according to CxH2x where x=2, 3, 4 or 5, and
• a are identical or different and are represented by an integer between 4 and 300,
• the vinyloxypolyether derivative structural unit β being represented by the following general formula (Ib)
• where RA are identical or different and are represented by a hydrogen atom, a linear C1-C12 alkyl group or branched C3-C12 alkyl group, C5-C8 cycloalkyl group, phenyl group or C7-C12 arylalkyl group,
• A are identical or different and are represented by an alkylene group according to CxH2x where x=2, 3, 4 or 5, and
• b are identical or different and are represented by an integer from 6 to 450,
• the arithmetic mean of the alkylene groups A of the structural units which belong to the vinyloxypolyether derivative structural unit β being higher by at least the factor 1.5 than the arithmetic mean of the alkylene groups A of the structural units which belong to the isoprenolpolyether derivative structural unit α.