Societa' Italiana Resine S.i.r. S.p.a.

Gaudenzio Bianchi

Pierino Radici

Paolo Colombo

Daniele Colombo

Block copolymer of the structure A-B wherein:

Block copolymers

Block copolymer of the structure A-B, wherein: ##STR1## A is a polylactamic block of recurring units: t,0010 WHEREIN PM is a linear polymethylene chain having from 3 to 13 carbon atoms, B is a polyoxymethylene block of recurring units [CH.sub.2 O]. The block copolymer contains at least 2 wt.% of block B and at least 0.05 wt.% of block A. The block copolymer can be used as technopolymer when rich in block B, or in the field of yarns and molded products when rich in block A.

A novel block copolymer HO--D--A--B--D--H, wherein

A stabilized polymeric composition comprising an acetal polymer and as stabilizer a copolymer R--D--A--B--D--R, in which:

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Fagnano Olona (Varese), Italy

Gaudenzio Bianchi