Absorbent sanitary products

Claim 1

An absorbent sanitary product, comprising: a film having a water vapor permeability of at least 500 g/m 2 /day at 23°C., 100-50% relative humidity and wind velocity 0.3 m/s, a liquid-permeable layer, and a liquid-absorbing bibulous layer; said film comprising a copolyether ester which consists of a plurality of recurrent intralinear ester groups having long-chain ester units and ester groups having short-chain ester units, which are randomly joined head-to-tail through ester bonds; said ester groups having long-chain ester units corresponding to the formula: ##STR3## and said ester groups having short-chain ester units corresponding to the formula: ##STR4## wherein: G is a bivalent radical remaining after removal of terminal hydroxyl groups from at least one long-chain glycol having a molecular weight greater than 800 and an average atomic ratio of carbon to oxygen of 2.0, R is a bivalent radical remaining after removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight less than 300, and D is a bivalent radical remaining after removal of hydroxyl groups from at least one low-molecular-weight diol having a molecular weight less than 250; at least 75 mole % of said dicarboxylic acid consisting of terephthalic acid or ester-forming equivalents thereof and at least 75 mole % of said low-molecular-weight diol consisting of 1,4-butanediol or ester-forming equivalents thereof, and a sum of the mole percentages of the dicarboxylic acid which is not terephthalic acid or an ester-forming equivalent thereof, and of the low-molecular-weight diol which is not 1,4-butanediol or an ester-forming equivalent thereof is at most 25; 1,2- 1,3-epoxypropane, 1,2-epoxybutane, 45to 95 weight % of the copolyether ester being made up of short-chain ester units; the liquid permeability of said film being a maximum of 0.02 g/cm 2 /h at 23°C. and 0.07 bar; the percentage by weight of the long-chain ester units in the copolyether ester being 5-55%, and the average carbon to oxygen ratio of the long-chain glycols being 2.0 to 3.7 and the molecular weight thereof being 800-6000 with the proviso that if the average atomic ratio of carbon to oxygen of the long-chain glycols is 2.0 to 2.4, the percentage by weight of the long-chain ester units is 5-35; the copolyether ester film being manufactured by at least one process selected from the group consisting of flat-sheet extrusion from polymer chips and extrusion blow molding from polymer chips, said polymer chips exhibiting a water absorption in 23°C. water of at most 15 weight %, referred to the dry weight of the chips.