Cold pressure fixable toner containing crystalline co-polyester-co-poly (alkylsiloxane)

A block copolymer comprises a crystalline polyester block, and an amorphous poly (alkyl siloxane) block, said block copolymer shows a baroplastisches behavior. The block copolymer is used in an kaltdruckfixierbaren toner. A method for manufacturing a block copolymer comprising a crystalline polyester block and an amorphous poly-alkyl siloxane block, includes heating a mixture of a diacid, a diol and a carbinol-terminated poly (alkylsiloxane).