Water retention agents for gypsum plaster and method for their manufacture.

摘要

1. Water-retention agents comprising at least one alkyl acrylate based polymer, characterised in that in view of their use for plasters they comprise an aqueous solution of at least one polymer selected from homopolymers and copolymers containing from 60 to 100% of at least one alkyl acrylate, the alkyl radical having from 1 to 8 carbon atoms, and from 0 to 40% of at least one vinyl ester, the said polymer being hydrolysed to the extent of 40 to 80%.