Patent ID: 8415011
Filing Date: 2013-04-09
Classification: A47G,B29C,B29K,B32B,B65D,C08G,C09J,Y10T

Abstract:
1. A breathable, heat-sealable composite film comprising first and second layers of polymeric material wherein: (i) the polymeric material of the first layer comprises a copolyester comprising monomeric units derived from one or more diol(s); one or more dicarboxylic acid(s), wherein at least one of said one or more dicarboxylic acids is an aromatic acid; and one or more poly(alkylene oxide)glycol(s); (ii) the second layer is a heat-sealable polymeric layer; (iii) the composite film has an elongation to break of less than 250%; and (iv) the poly(alkylene oxide) glycol of the first layer constitutes in the range of 10 to 40 mol % of all diol and glycol monomeric units of the first layer; wherein the polymeric material of the first layer comprises greater than 50% of the copolyester by weight, relative to the total amount of polymeric material in the first layer, and wherein the composite film is uniaxially or biaxially oriented.