Patent ID: 6017598
Filing Date: 2000-01-25
Classification: A61J,A61M,B29C,B29L,B32B,B65D,C08L,Y10S,Y10T

Abstract:
A method of sealing a multilayer polymer film including two or more layers, which, at a first sealing temperature, forms a peelable bond and, at a second higher sealing temperature, forms a permanent bond, wherein the sealing layer has a matrix phase polymer system, wherein the matrix polymer is a polyethylene homopolymer, a polyethylene copolymer, a polypropylene homopolymer, or a polypropylene copolymer and the phase polymer is a styrene ethylene/butylene styrene triblock polymer with a styrene ethylene/butylene diblock component, a styrene ethylene/propylene styrene triblock polymer, a styrene butadiene styrene triblock polymer, and/or a styrene isoprene styrene triblock polymer, which method comprises forming a seam which can be separated by a force in the range of 5 to 20 N/mm.sup.2 by sealing the film at a temperature in the range of from 123.degree. C. to 128.degree. C.