Transparent sealant and its production and use

A transparent sealing compound, in particular for use in a wall penetration of lines or in a splice site of a cable set, the sealing compound comprising a UV-polymerized and UV-crosslinked poly(alkyl acrylate) copolymer having a statistical or random copolymer structure, which is crosslinked such that its elongation amounts to more than 1000% for a material thickness of 1.5 mm according to ISO 527-2/1BA/300, and its shear strength is less than 1000 min according to DIN EN 1943 tested per method A, 625 mm2 contact surface area;

• wherein the poly(alkyl acrylate) copolymer comprises a UV-polymerized and UV-crosslinked composition of a pre-polymerizate having a viscosity of 2.3 Pa-s measured at 23° C. using a Brookfield viscometer, spindle 3;
• and a first portion of one or more photo-initiators that absorb UV light in the range of 200 nm to 400 nm;
• wherein the pre-polymerizate is a reaction product of at least 89.0 wt. % of one or more alkyl acrylate monomers with 4 to 20 carbon atoms in the alkyl chain, wherein at least a portion of the alkyl acrylate monomers are multifunctional acrylate monomers, up to 1.9 wt. % of acrylic acid and/or methacrylic acid, and a second portion of the one or more photo-initiators;
• wherein the sum of the first portion and the second portion of the one or more photo-initiators is in the range of 0.1 wt. % to 1.0 wt %;
• wherein the total amount of the one or more alkyl acrylate monomers, the acrylic acid and/or methacrylic acid, and the one or more photoinitiators present in the poly(alkyl acrylate) copolymer adds up to 100 wt. %.