Patent ID: 8158226
Filing Date: 2012-04-17
Classification: B32B,B65D,Y10T

Abstract:
1. A paper container having a window and being formed of a laminate that comprises at least a paper layer, a gas barrier laminate, and a polypropylene layer, the paper layer having a cutout part for the window, the cutout part being hollow and covered on an inner side and/or an outer side with the gas barrier laminate, and the gas barrier laminate comprising a substrate and a gas barrier layer laminated on at least one surface of the substrate, wherein the gas barrier layer is formed of a composition comprising: a polymer having at least one functional group selected from a carboxyl group and a carboxylic anhydride group, wherein at least 40 mol % of a —COO— group contained in the at least one functional group has been neutralized with a metal ion having a valence of two or more; and a hydrolysis condensation product of at least one compound (L) containing a metal atom to which at least one characteristic group selected from a halogen atom and an alkoxy group has been bonded, wherein the compound (L) comprises: at least one compound (A) represented by the following Chemical Formula (I): where M 1 represents Si, Al, Ti, Zr, Cu, Ca, Sr, Ba, Zn, B, Ga, Y, Ge, Pb, P, Sb, V, Ta, W, La, or Nd, R 1 represents an alkyl group, X 1 represents a halogen atom, Z represents an alkyl group having a substituted functional group reactive with a carboxyl group, m is equal to a valence of M 1 , n is an integer of 0 to (m−1), k is an integer of 0 to (m−1), and 1<n+k<(m−1); and at least one compound (B) represented by the following Chemical Formula (II): where M 2 represents Si, Al, Ti, Zr, Cu, Ca, Sr, Ba, Zn, B, Ga, Y, Ge, Pb, P, Sb, V, Ta, W, La, or Nd, R 2 represents an alkyl group, R 3 represents an alkyl group, an aralkyl group, an aryl group, or an alkenyl group, X 2 represents a halogen atom, p is equal to a valence of M 2 , q is an integer of 0 to p, r is an integer of 0 to p, and 1<q+r<p, and wherein a molar ratio of the compound (A) / the compound (B) is from 0.5/99.5 to 40/60.