Commission Implementing Decision (EU) 2026/1424 of 30 June 2026 on the non-approval of poly(dimethyloctadecyl[3-(trihydroxysilyl)propyl]ammonium chloride) generated from dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride as an existing active substance for use in biocidal products of product-types 2, 7 and 9 in accordance with Regulation (EU) No 528/2012 of the European Parliament and of the Council