Patent ID: 6919112

Claim:
A biaxially stretched and thermoset, tubular, seamless, single-layer or a biaxially stretched and thermoset, tubular, seamless, multiple-layer sausage casing having a residual shrinkage in the range of from 5 to 20% at 80° C., wherein the shrinkage is measured before stuffing, in which the layer or, in the case of multiple-layer casings, at least one of the layers comprises a block copolymer containing “hard” aliphatic polyamide blocks having a glass-transition temperature of from 20 to 80° C. and “soft” aliphatic polyether blocks having a glass-transition temperature of from −100 to −20° C., which block copolymer corresponds to the following formula —[X a —(CO—[CH 2 ] x —NH) o —Y—X a —(A—O) p —A]— where Y is —CO—, —CO—[CH 2 ] z —CO— or —CO—C 6 H 4 —CO—, where C 6 H 4 is meta- or para-phenylene, or is —CO—N([CH 2 ] x−1 —CH 3 )—CO—, —CO—N([CH 2 ] x−1 —CH 3 )—CO—[CH 2 ] z —CO—N([CH 2 ] x−1 —CH 3 )—CO— or —CO—N([CH 2 ] x−1 —CH 3 )—CO—C 6 H 4 —CO—N([CH 2 ] x−1 —CH 3 )—CO—, where C 6 H 4 is para or meta phenylene, o is an integer from 10 to 150 and p is an integer from 4 to 100 and X a is —O—, A is an alkanediyl radical of the formula —CH 2 —CH 2 —(=ethane-1,2-diyl), —CH 2 —CH(CH 3 )—(=propane-1,2-diyl) or —(CH 2 ) 4 —(=butane-1,4-diyl), x is an integer from 5 to 11, and z is an integer from 4 to 10.