Colon Capsule with Textured Structural Coating for Improved Colon Motility

A trimodal polyethylene consisting essentially of three polymeric weight fractions A,B,C, wherein the low molecular weight fraction A is a homopolymer and the medium and the high molecular weight fractions B and C, respectively, are copolymers of ethylene and 1-butene as the comonomer,

• the polyethylene consists essentially of 50 to 60% (w/w) of homopolymer A, 22 to 26% (w/w) of copolymer B, 18 to 24% (w/w) of copolymer C, and 0 to 5% (w/w) of non-polymeric additives and/or polymeric lubricants selected from the group consisting of:
• (i) colorants, (ii) antioxidants;
• (iii) stabilizers;
• (iv) inorganic or carbonic acids or acid anhydrides;
• (v) non-polymeric lubricants;
• (vi) a fluoropolymer lubricant;
• and (vii) polybutene-1, based on the total weight of the polymer, and wherein the polyethylene is obtained by stepwise polymerization in the presence of a solid Ziegler-Natta catalyst component, where the solid catalyst is the product of a process comprising (a) reacting magnesium diethoxide with titanium tetrachloride carried out in a hydrocarbon at a temperature of 50-100° C., (b) subjecting the reaction mixture obtained in (a) to a heat treatment at a temperature of 110° C. to 200° C. for a time ranging from 3 to 25 hours (c) isolating and washing with a hydrocarbon the solid obtained in (b), said solid catalyst component having a Cl/Ti molar ratio higher than 2.5,
• wherein the polyethylene has a density of 0.954 to 0.960 g/cm3, a melt index (HLMI) according to ASTM D-1238, at 190° C. and 21.6 kg, of 2.9 to 4.2 g/10 min and a swell ration of 151 to 182%, and
• the polyethylene is produced by polymerization with a Ziegler-Natta catalyst.