Patent ID: 7262245

Claim:
A sealing composition of low density and increased tensile strength comprising a sulfur-containing polymer, the sealing composition having a cured density of no more than 1.3 g/cm 3 determined according to ISO 2781 and a cured tensile strength of at least 1.9 N/mm 2 according to ISO 37, whereby the sealing composition has been prepared from a base composition containing at least two base polymers that are polysulfides, wherein the base composition comprises a) at least one sulfur-containing long-chain liner polymer with a chain length in the range approximately of 1500 to 5000 g/mol and b1) at least one sulfur-containing short-chain branched polymer with a chain length in the range approximately of 500 to 2000 g/mol which has a content of trifuntional molecules or b2) at least one polyfunctional crosslinker with a number of functional groups n is greater than or equal to 3 or a combination of b1) and b2), wherein the scaling composition does not include an epoxidated polysulfide.