abstract |
The capsule is formed by dipping a core in an aqs. dispersion of a coating substance formed by polymerising a vinylic monomer, the coating subst contg. 10-55% by wt of monomer having a carboxyl gp and/or a mono or dialylaminoalkyl ester gp. Pref. the coating substance contains 10-55% by wt acrylic and/or methacrylic acid or a mono or dialkylamino alkyl ester of acrylic or methacrylic acid, the balance being alkylic esters of acrylic or methacrylic acid. The capsule is not water soluble. Its dissolving time in stomach acids can be controlled. |