Patent ID: 7932258

Claim:
A pharmaceutical form consisting essentially of an active substance-containing core which is coated with a partially neutralized, anionic (meth)acrylate copolymer consisting of free radical-polymerized units of 25 to 95% by weight of C 1 - to C 4 -alkyl esters of acrylic or methacrylic acid and 5 to 75% by weight of (meth)acrylate monomers having an anionic group, more than 10% of said anionic groups being neutralized by means of a base; wherein said pharmaceutical form releases at least 30% of the contained active substance in 30 minutes at a pH between 2 and 6 at which the active substance is soluble and stable and at which pH a corresponding pharmaceutical form which is coated with the un-neutralized anionic (meth)acrylate copolymer would release less than 10% of the contained active substance in 30 minutes.