Flexible, polyamide-based compositions suitable for extrusion blow moulding
AssigneeElf Atochem S.A.
InventorsAlain Bouilloux, Laurent Teze
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Abstract
The invention relates to compositions comprising a matrix of an alloy of (a) polyamide and (b) polymer having polyamide blocks and polyether blocks, dispersed in which matrix is a crosslinked phase (c), the said compositions having a melt strength of more than 1.5 and a flexural modulus at 23° C. (in accordance with ISO 178-93) of less than 700 MPa and preferably between 50 and 250 MPa. Such a composition is useful for manufacturing extrusion blow-moulded parts, especially for cars. It also relates to articles additionally comprising a part made of polyamide and polyolefin or of a mixture of polyamide and polyolefin.
Claims3
Compositions comprising:
- a matrix of an alloy of (a) polyamide and (b) polymer having polyamide blocks and polyether blocks, dispersed in the matrix is a crosslinked phase (c);
- wherein (c) is the product of reaction to a functionalized polymer (C1) which (C1) is either a copolymer of ethylene and an unsaturated epoxide or a polyolefin grafted with an unsaturated epoxide with an at least difunctional product (C2) which is either (i) a copolymer of ethylene and an unsaturated carboxylic acid or anhydride, or (ii) a polyolefin grafted with an unsaturated carboxylic acid or an unsaturated carboxylic anhydride;
- wherein the anhydride functions are partly hydrolyzed or are a mixture of a polymer with acid functions and of a polymer with anhydride functions;
- and
- wherein the compositions having a melt strength of greater than 1.5 and a flexural modulus at 23° C., in accordance with ISO 1798-93, of less than 700 MPa.
Compositions comprising a matrix of an alloy of:
- (a) a polyamide of PA 6 and
- (b) a copolymer having polyamide of PA 6 blocks and polyether of PTMG blocks;
- dispersed in the matrix is a crosslinked phase (c) of a copolymer (C1) of ethylene, an alkyl (meth)acrylate and glycidyl (meth)acrylate with a copolymer (C2) of ethylene, an alkyl (meth)acrylate and maleic anhydride;
- wherein the compositions having a melt strength of between 1.7 and 2 and a flexural modulus at 23° C., in accordance with ISO 1798-93, of less than 700 MPa.
Dependencies are inferred from the claim text.