Polyamides having improved anti-delamination
View Patent ↗The present invention generally relates to polyamide compositions having improved anti-delamination. More specifically, the present invention relates to novel polyamide compositions demonstrating improved anti-delamination, which can have at least one low purity polyamide.
1. A polyamide composition haying improved anti-delamination comprising:
(a) about 2 to about 20 wt. % of at least one post-consumer recycled polyamide haying a polyamide content of about 60 to less than 80 wt. %;
(b) about 65 to about 95 wt. % of at least one post-consumer recycled polyamide having a polyamide content of 80 to less than 95 wt. %;
(c) olefinic content having a heat of melting of from about 1 J/g to about 3.2 J/g;
(d) about 3 to about 15 wt. % of at least one functionalized polyolefin;
wherein the weight percentages are based on a total weight of the polyamide composition; and
wherein said polyamide composition, when molded into a part, exhibits no delamination using a cut and peel delamination test.
2. The polyamide composition of claim 1 , wherein the low purity polyamide comprises about 60 to less than 80 wt. % of polyamide 6, polyamide 66, or mixtures thereof.
3. The polyamide composition of claim 1 , wherein the post-consumer recycled polyamide (b) comprises 80 to less than 95 wt. % of polyamide 6, polyamide 66, or mixtures thereof.
4. The polyamide composition of claim 1 , wherein the olefin content has a heat of melting of from about 1 J/g to 2.9 J/g or less.
5. The polyamide composition of claim 1 wherein the at least one functionalized polyolefin (d) is selected from a grafted propylene homopolymer, a grafted ethylene/1-octene copolymer, a grafted ethylene/propylene copolymer, a grafted ethylene/butene copolymer, a grafted ethylene/propylene/diene terpolymer (EPDM), or mixtures thereof.
6. The polyamide composition of claim 5 , wherein the functionalized polyolefin is grafted with maleic anhydride.
7. The polyamide composition of claim 1 , wherein the olefinic content is 10 wt. % or less.
8. The polyarnide composition of claim 1 , wherein the olefinic content is about 9 wt. % or less.
9. The polyamide composition of claim 1 , wherein the olefinic content is about 3 to less than 9 wt. %.
10. The polyamide composition of claim 1 comprising about 2 to about 18 wt. % of post-consumer recycled polyamide (a).
11. The polyamide composition of claim 1 comprising about 70 to about 90 wt. % of post-consumer recycled polyamide (b).
12. The polyamide composition of claim 5 comprising about 5 to about 12 wt. % of the functionalized polyolefin.
13. A process for producing a polyamide composition according to claim 1 with improved anti-delamination, the process comprising:
adding 20 wt. % or less of (a) at least one post-consumer recycled polyamide having a polyamide content of about 60 to less than 80 wt. % to at least 65 wt. % of (b) at least one post-consumer recycled polyamide having a polyamide content of 80 to less than 95%; and from about 3 to about 15 wt. % of (c) a functionalized polyolefin, wherein the polyamide composition has an olefinic content with a heat of melting of from about 1 J/g to about 3.2 J/g, determined by measuring the heat of melting by differential scanning calorimetry (DSC), and the weight percentages of (a), (b), and (c) are based on a total weight of the polyamide composition.
14. The process of claim 13 , wherein the post-consumer recycled polyamide (a) is melt blended with the post-consumer recycled polyamide (b).
15. The process of claim 13 , wherein the polyamide composition is extruded or injection molded to form at least one article.
16. The polyamide composition of claim 1 further comprising about 10 to about 45 wt. % of at least one glass filler, carbon fiber filler, or mixtures thereof.
17. A polyamide composition having improved anti-delamination comprising:
(a) about 65 to about 95 wt. % of at least one post-consumer recycled polyamide having a polyamide content of 80 to less than 95 wt. %; and
(b) an olefinic content having a heat of melting of from about 1 J/g to about 2.9 J/g;
(c) about 3 to about 15 wt. % of at least one functionalized polyolefin;
wherein the weight percentages are based on a total weight of the polyamide composition; and
wherein said polyamide composition, when molded into a part, exhibits no delamination using a cut and peel delamination test.
18. The polyamide composition of claim 17 further comprising about 10 to about 45 wt. % of at least one glass filler, carbon fiber filler, or mixtures thereof.