Patent ID: 6878387

Claim:
A pharmaceutical formulation comprising (a) a core containing an active principle and 2.5 to 97.5 wt % of at least one salt of an organic acid, based on the core weight, and (b) an outer coating film, which comprises 40 to 100 wt % of at least one (meth)acrylate copolymer (1) which comprises 93 to 98 wt % of radically polymerized C1 to C4 alkyl esters of acrylic or methacrylic acid and 7 to 2 wt % of (meth)acrylate monomers with a quaternary ammonium group in the alkyl radical, and optionally 1 to 60 wt % of at least one (meth)acrylate copolymer (2), different from (meth)acrylate copolymer (1), and which comprises 85 to 100 wt % of radically polymerized C1 to C4 alkyl esters of acrylic or methacrylic acid and up to 15 wt % of (meth)acrylate monomers with basic groups or acid groups in the alkyl radical.