Multi-layer composite for reusable multi-layer packs
First Claim
1. A multi-layer composite containing at least one copolyamide protective layer and at least one copolyamide barrier layer laminated therewith, said protective layer being between said barrier layer and a source of moisture, said protective layer comprising a partially aromatic, amorphous protective copolyamide composed of at least one monomer taken from each of the following classes:
- (1) 2 to 40 molar parts of (a) at least one long-chain aliphatic monomer having 9 to 40 carbon atoms, (b) at least one lactam having 9 to 12 carbon atoms, (c) at least one ω
-aminocarboxylic acid having 9 to 12 carbon atoms, and (d) at least one dodecane diamine and at least one dodecane diacid in substantially equimolar ratios,(2) at least one cycloaliphatic diamine having 6 to 26 carbon atoms, and(3) at least one substituted or unsubstituted aromatic dicarboxylic acid having 8 to 20 carbon atoms,wherein (1), (2) and (3) total 100 molar parts, and (2), and (3) are present in substantially equimolar amounts;
a barrier layer consisting essentially of at least one partially aromatic barrier copolyamide consisting essentially of at least one monomer taken from each of the following classes;
(4) at least one short-chain aliphatic diamine having 4 to 8 carbon atoms which may be replaced by up to 49% by weight of at least one additional diamine selected from the group consisting of cycloaliphatic diamines having 6 to 26 carbon atoms, and/or by up to 40 molar % of at least one araliphatic diamine having 6 to 26 carbon atoms, and(5) at least one substituted or unsubstituted aromatic dicarboxylic acid having 8 to 20 carbon atoms, of which 0 to 20 molar parts may be replaced by at least one aliphatic dicarboxylic acid having 4 to 8 carbon atoms,wherein (4) and (5) total 100 molar parts, and are present in substantially equimolar amounts.
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Accused Products
Abstract
A multi-layer composite made of at least one copolyamide protective layer, and at least one copolyamide barrier layer, with the protective layer placed such that it is between the barrier layer and a source of moisture. The protective copolyamide layer is composed of a partially aromatic, amorphous copolyamide of a specified composition, and the barrier layer is composed of a partially aromatic barrier copolyamide of a specified composition. This multi-layer composite is especially useful in reusable packaging systems, such as beverage bottles or containers of any kind.
26 Citations
23 Claims
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1. A multi-layer composite containing at least one copolyamide protective layer and at least one copolyamide barrier layer laminated therewith, said protective layer being between said barrier layer and a source of moisture, said protective layer comprising a partially aromatic, amorphous protective copolyamide composed of at least one monomer taken from each of the following classes:
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(1) 2 to 40 molar parts of (a) at least one long-chain aliphatic monomer having 9 to 40 carbon atoms, (b) at least one lactam having 9 to 12 carbon atoms, (c) at least one ω
-aminocarboxylic acid having 9 to 12 carbon atoms, and (d) at least one dodecane diamine and at least one dodecane diacid in substantially equimolar ratios,(2) at least one cycloaliphatic diamine having 6 to 26 carbon atoms, and (3) at least one substituted or unsubstituted aromatic dicarboxylic acid having 8 to 20 carbon atoms, wherein (1), (2) and (3) total 100 molar parts, and (2), and (3) are present in substantially equimolar amounts;
a barrier layer consisting essentially of at least one partially aromatic barrier copolyamide consisting essentially of at least one monomer taken from each of the following classes;(4) at least one short-chain aliphatic diamine having 4 to 8 carbon atoms which may be replaced by up to 49% by weight of at least one additional diamine selected from the group consisting of cycloaliphatic diamines having 6 to 26 carbon atoms, and/or by up to 40 molar % of at least one araliphatic diamine having 6 to 26 carbon atoms, and (5) at least one substituted or unsubstituted aromatic dicarboxylic acid having 8 to 20 carbon atoms, of which 0 to 20 molar parts may be replaced by at least one aliphatic dicarboxylic acid having 4 to 8 carbon atoms, wherein (4) and (5) total 100 molar parts, and are present in substantially equimolar amounts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification