EASY-TO-TEAR WRAPPING TAPE

摘要

An easily-tearable adhesive-free tape roll comprises a film of a copolymer of an alpha-olefin and an alpha, beta-unsaturated 3-8C carboxylic acid whereby the carboxylic acid groups of the copolymer are ionized to 10-90% by neutralization with alkali metal compounds. An easily-tearable adhesive-free tape roll comprises a film (I) of a copolymer of: (a) an alpha-olefin of formula (1); (b) an alpha, beta-unsaturated 3-8C carboxylic acid and; (c) optionally a further monoethylenically unsaturated monomer whereby the carboxylic acid groups of the copolymer are ionized to 10-90 % by neutralization with alkali metal compounds. R-CH=CH2 (1) R = H or 1-10C alkyl Independent claims are included for: (1) an easily tearable tape roll (II) comprising a film (I) and an adhesive layer and; (2) a process for the production of the tape roll (II) whereby the tape roll is rolled to form rods, heated to increase the unrolling strength followed by cutting to rolls whereby the unrolling strength of the resulting material is increased by at least 50% at 300 mm/min or the tape roll is treated by a flame or corona discharge or a polar coextrusion layer is applied followed by rolling such that the unrolling strength of the resulting material is increased by at least 50% at 300 mm/min or the tape roll is cut by a process that results in crude cut edges that allow easy tearing by hand whereby the extension at break of the cut tape rolls is at least 30% less than being out by a sharp edge; the tape roll is cut on an automatic trimmer with a defined speed of knife advance and the tape rolls are wound on a card core of 30-40 mm internal diameter.