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1. WO1992015644 - FLEXIBLE THERMOPLASTIC COMPOSITIONS COMPRISING NYLON

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[ EN ]

CLAIMS
1. A thermoplastic molding composition comprising:
up to 50 weight percent of a polyamide having a number average molecular weight in the range of 10,000 to 50,000;
characterized by
further consisting of between 1 and 49 weight percent of at least one modified ethylene copolymer comprising at least 2 reactive moieties and comprising units of an C3-C8 α-olefin other than ethylene; between 1 and 49 weight percent of an ionomer of at least one olefinic acid copolymers having units derived from an α-olefin of the formula RCH = CH2 wherein R is hydrogen or an alkyl radical of 1-8 carbon atoms, and a second unit derived from an α,β -ethylenically unsaturated carboxylic acid and where the copolymer is between 10%-100% neutralized by a metal ion selected from Group I - Group VIIIB metals.

2. The composition according to claim 1 wherein the modified ethylene copolymer is an ethylene/propylene copolymer.

3. The compositon according claim 8 wherein the modified ethylene copolymer comprises at least 2 reactive moities selected from carboxyl or carboxylate functionalities.

4. The composition according to claim 1 wherein the ionomer is a terpolymer comprising the α-olefin and the α,β-ethylenically
unsaturated carboxylic acid and a monoethylenically unsaturated monomers.

5. The composition according to claim 1 further
characterized by exhibiting resistance to stress cracking when immersed in a zinc chloride solutions.

6. The composition according to any preceeding claim further characterized as including up to 5 weight percent magnesium oxide.

7. A process for producing the thermoplastic molding composition according to any preceeding claim
characterized in that :
the thermoplastic molding composition is produced by a process wherein the thermoplastic molding composition is formed in a single process step wherein the polyamide, are melt blended with the modified ethylene copolymer and the ionomer in a single blending operation.