Thermoplastic composition based on polyamide, polyketone and novolac resin
A thermoplastic composition based on polyamide and polyketone is described. The thermoplastic composition can have an excellent mechanical strength and dimensional stability. Further, the composition can include a novolac resin and a reinforcing or a bulking filler. The composition can be molded, for example in the form of granules or powder, which is used for manufacturing articles via an injection-molding process.
1. A melt-blended composition comprising
40% to 98% by weight of a polyamide;
1% to 20% by weight of a polyketone; and
1% to 20% by weight of a novolac resin, with respect to the total weight of the composition.
2. The composition as described by claim 1 , wherein the polyamide is selected from the group consisting of: a PA 66, a PA 610, a PA 612, a PA 6.66, a PA 46, a MXD6, a PA 66/6T, a PA 6, a PA 11 and a PA 12.
3. The composition as described by claim 1 , wherein the polyketone is aliphatic.
4. The composition as described by claim 1 , wherein the polyketone is represented by the formula:
(CO—CH 2 —CH 2 ) x —(CO-A) y -
in which A denotes an unsaturated monomer having at least 3 carbon atoms and the x/y ratio is at least 2.
5. The composition as described by claim 1 , wherein the polyketone is a copolymer of ethylene and carbon oxide.
6. The composition as described by claim 1 , wherein the composition comprises a reinforcing or bulking filler and/or an impact modifier.
7. A method of reinforcing mechanical properties of a polyamide, the method comprising melt-blending a novolac resin and a polyketone with the polyamide to form the melt-blended composition according to claim 1 .
8. The composition as described by claim 1 , wherein the polyketone is a copolymer of ethylene, propylene and carbon oxide.
9. The composition as described by claim 1 comprising 40% to 96% by weight of the polyamide.
10. A molded article comprising a melt-blended composition comprising:
40% to 98% by weight of a polyamide;
1% to 20% by weight of a polyketone; and
1% to 20% by weight of a novolac resin, with respect to the total weight of the composition.
11. The molded article as described by claim 10 , wherein the molded article is an injection molded article.
12. The composition according to claim 1 , comprising
88% to 96% by weight of a polyamide;
2% to 6% by weight of a polyketone; and
2% to 6% by weight of a novolac resin, with respect to the total weight of the composition.