Multilayer laminates from blow moldable thermoplastic polyamide and polyvinyl alcohol resins
AssigneeE. I. Du Pont de Nemours and Company
InventorsJames D. Katsaros, Vinodkumar Mehra
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Abstract
Multilayer laminates formed from at least two layers. The first layer being a flexible blow moldable thermoplastic polyamide composition and the second layer being a vinyl alcohol composition. These laminates can withstand high temperatures for extended periods of time, possess low temperature impact strength, and have resistance to permeation of fuel compositions. These laminates are especially suited for fuel tanks for motor vehicles.
Claims17
A multi-layer laminate comprising at least two layers, wherein a first layer is a flexible thermoplastic blow moldable polyamide composition which comprises a substantially homogeneous blend of
- (a) about 40-60 weight percent thermoplastic polyamide,
- (b) about 20-58 weight percent of a first ethylene copolymer selected from the group consisting of copolymers of ethylene and at least one .alpha.,.beta. ethylenically-unsaturated carboxylic acid having 3-8 carbon atoms, and ionomers of said ethylene copolymers,
- (c) about 1-20 weight percent of a second ethylene copolymer having interpolymerized units of ethylene and an .alpha.,.beta. ethylenically-unsaturated aliphatic epoxide, and
- a second layer is a vinyl alcohol composition selected from the group consisting of polyvinyl alcohol and copolymers of vinyl alcohol.
A process for preparing a laminated article comprising the steps of
- i) melting a flexible thermoplastic blow moldable polyamide composition in a first extruder, and concurrently
- ii) melting a vinyl alcohol composition in a second extruder
- iii) transporting the polyamide composition and the vinyl alcohol composition from a feed block into a die;
- iv) exiting the thermoplastic polyamide composition and the vinyl alcohol composition as coextruded layers from a die slot.
Dependencies are inferred from the claim text.