Polymer made from maleic acid, allyl ether, and vinyl acetate and the preparation and use of said polymer

摘要

The invention relates to comb polymers made from maleic acid or derivatives thereof, allyl ethers, and vinyl acetate, and the preparation thereof by free-radical polymerization at a reaction temperature of 10° C. to 50° C. The invention relates further to the use of such comb polymers to improve the workability of hydraulically setting compositions.

主权项

1. A polymer P comprising:
m mol % of at least one structural unit A of the formula (I); n mol % of at least one structural unit B of the formula (II); o mol % of at least one structural unit C of the formula (III);and optionally
p mol % of at least one further structural unit D; where R1 and R2 in this respect independently of one another each stand for COO−M or COOR4, R3 stands for H or CH3, R4 stands for R5 stands for an alkylene group having 1 to 6 C atoms, R6 stands for H, an alkyl group, or an alkylaryl group; wherein substituent A independently of one another stands for a C2 to C4 alkylene group, the subscript q represents a value of 2 to 300, and the subscript r represents a value of 0 to 1; wherein M=cation, preferably H+, an alkali metal ion, alkaline earth metal ion, a bivalent or trivalent metal ion, NH4+, or an organic ammonium; wherein m, n, o, p independently of one another are numbers, whereby the sum m+n+o+p=100, and m>0, n>0, o>0 and p≧0; and wherein m=20-85 n=10-35 o=12.5-50 p=0-20.