PARTLY NEUTRALIZED ANIONIC (METH)ACRYLATE COPOLYMER

摘要

The invention relates to a partly neutralised anionic (meth)acrylate copolymer consisting of radically polymerised units containing 25-95 % by weight (meth)acrylic acid C1 to C4 alkylesters and 5-75 % by weight (meth)acrylate monomer with an anionic group, wherein 0.1 to 25 % contained anionic groups are neutralised by a base. Said invention is characterised in that said base is embodied in the form of an cationic organic base whose molecular weight is greater than 150. A medical form containing said partly neutralised anionic (meth)acrylate copolymer and the use of said partly neutralised anionic (meth)acrylate copolymer for producing a medical form rapidly releasing an active substance having a determined pH value are also disclosed.