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US 12,378,410 B2Granted
Polyamide composition and a tubular or pipe multilayer structure comprising the same
AssigneeBASF SE
InventorsMohammad Meysami, Gijsbrecht Jacobus Maria Habraken, Stephen J. Hanley
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Abstract
Described herein is a polyamide composition and a tubular or pipe multilayer structure including the same.
Claims15
A polyamide composition, comprising:
- (a) a polyamide copolymer obtained by reacting
- (i) ε-caprolactam, and
- (ii) a mixture of hexamethylenediamine with a diacid comprising at least 9 carbon atoms,
- wherein the weight ratio between (i) and (ii) is in between 1.0:1.0 to 3.0:1.0,
- (b) at least one polyamide which is different from (a),
- (c) at least one impact modifier having a glass transition temperature below 0° C., and
- (d) additives
- wherein the impact modifier is selected from (i) ethylene-methacrylic acid copolymer, (ii) ethylene polymers and copolymers grafted with an epoxy compound, and (iii) olefin or acrylic acid or anhydride terpolymers.
5 more elements
A tubular or pipe multilayer structure, comprising an innermost layer, a middle layer and an outermost layer, wherein the innermost layer and the outermost layer, independent of one another, comprises
- (a) a polyamide copolymer obtained by reacting
- (i) ε-caprolactam, and
- (ii) a mixture of hexamethylenediamine with a diacid comprising at least 9 carbon atoms, wherein the weight ratio between (i) and (ii) is in between 1.0:1.0 to 3.0:1.0,
- wherein the middle layer comprises
- (b) at least one polyamide which is different from (a), and
- wherein at least one impact modifier (c) having a glass transition temperature below 0° C. and additives (d) are present in at least one of the innermost layers, the middle layer and the outermost layer.
3 more elements
Dependencies are inferred from the claim text.