Patent ID: 6616998
Filing Date: 2003-09-09
Classification: B32B,C08L,Y10T

Abstract:
A heat sealable packaging film producing a peelable seal formed from a blend, the blend comprising:(A) about 99 to about 75 weight percent of a copolyester comprising: i. diacid residues of at least about 50 mole percent terephthalic acid, naphthalenedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, or mixtures thereof; and ii. diol residues of about 90 to about 35 mole percent ethylene glycol and about 10 to about 65 mole percent of at least one of diethylene glycol or 1,4-cyclohexanedimethanol; and (B) about 1 to about 25 weight percent of an impact modifying polymer selected from copolymers and terpolymers having the respective general formulas E/Y and E/X/Y wherein: X represents residues derived from wherein R1 is alkyl of up to about 8 carbon atoms and R2 is hydrogen, methyl, or ethyl, and X constitutes about 1 to about 30 weight percent of terpolymer E/X/Y; Y represents residues derived from glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether or 3,4-epoxy-1-butene, and Y constitutes about 0.5 to about 10 weight percent of copolymer E/Y and terpolymer E/X/Y; and E represents ethylene residues that constitute the remainder of the copolymer or terpolymer; wherein copolyester component A is based on 100 mole percent diacid residues and 100 mole percent diol residues and the weight percentages are based on the total weight of components A and B.