Claims
- 1. A blend comprising (a) from about 75 to about 90 wt % polyphthalamide comprising at least about 40 mole percent recurring aliphatic diamine terephthalamide units represented by the formula: ##STR3## wherein R comprises at least one aliphatic C.sub.4 -C.sub.14 hydrocarbyl radical, said polyphthalamide having a Tg greater than about 75.degree. C. and a Tm greater than about 270.degree. C.;
- (b) from about 5 to about 25 wt % functionalized rubbery impact modifier;
- (c) from about 5 to about 30 wt % polypropylene; and
- (d) from 0 to about 20 wt % of carboxyl-modified polyolefin.
- 2. The blend of claim 1 wherein said functionalized rubbery impact modifier is selected from the group consisting of functionalized polymers of ethylene and at least one C.sub.3 -C.sub.8 higher alpha-olefin and functionalized block copolymers having blocks of polymerized vinylaromatic monomer units and polymeric rubber blocks comprising units of at least one of ethylene/propylene, ethylene/butylene and ethylene/pentylene.
- 3. The blend of claim 1 wherein the functionalized rubbery impact modifier is selected from the group consisting of maleated ethylene-propylene copolymer, maleated SEBS block polymer and maleated EPDM.
- 4. The blend of claim 1 wherein said polyphthalamide has a Tm in the range of from about 270.degree. C. to about 350.degree. C. and comprises from 40 to 100 mole % aliphatic diamine terephthalamide units represented by the formula: ##STR4## and from 0 to about 60 mole % aliphatic diamine adipamide units represented by the formula: ##STR5## wherein R comprises at least one C.sub.4 -C.sub.14 divalent aliphatic radical;
- 5. The blend of claim 4 wherein the polyphthalamide comprises from about 40 to 95 mole % said aliphatic diamine terephthalamide units, from about 5 to about 60 mole % aliphatic diamine adipamide units and from 0 to about 25 mole % aliphatic diamine isophthalamide units.
- 6. The blend of claim 4 wherein said R is C.sub.6.
- 7. The blend of claim 1 wherein said polyphthalamide has a Tg in the range of from about 80.degree. C. to about 130.degree. C. and a Tm in the range of from about 290.degree. C. to about 330.degree. C.
- 8. The blend of claim 1 comprising polypropylene and carboxyl-modified polyolefin in a weight ratio of from about 3:1 to about 1:3.
- 9. A method for improving the rigidity of impact-modified polyphthalamide blends comprising (a) from about 45 to about 90 wt % polyphthalamide having a Tg greater than about 75.degree. C. and a Tm greater than about 270.degree. C. and containing aliphatic diamine terephthalamide units represented by the formula: ##STR6## wherein R comprises at least one aliphatic C.sub.4 -C.sub.14 hydrocarbyl radical; and (b) from about 5 to about 20 wt % functionalized rubbery impact modifier selected from the group consisting of maleated ethylene-propylene copolymer, maleated SEBS block polymer and maleated EPDM, said method comprising the step of compounding the polyphthalamide with said functionalized rubbery impact modifier and with from about 5 to about 30 wt % polypropylene and from 0 to about 20 wt % of carboxyl-modified polyolefin, based on total resinous components.
- 10. The method of claim 9 wherein said impact modified polyphthalamide is compounded with polypropylene and a carboxyl-modified polyolefin in a weight ratio of from about 3:1 to about 1:3.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a Continuation-in-Part of U.S. application Ser. No. 07/889,814, now U.S. Pat. No. 5,292,805 filed May 29, 1992 and U.S. application Ser. No. 08/021,303, filed Feb. 23, 1993, now abandoned which was a Continuation-in-Part of U.S. application Ser. No. 07/585,879, filed Sep. 20, 1990, now abandoned.
US Referenced Citations (5)
Related Publications (1)
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Number |
Date |
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21303 |
Feb 1993 |
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Continuation in Parts (2)
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Number |
Date |
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Parent |
889814 |
May 1992 |
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Parent |
585879 |
Sep 1990 |
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