Claims
- 1. A flexible polyamide-containing polymer composition, having a melt viscosity of from about 1,000 to about 1,400 Pa.multidot.s at 270.degree. C. and under a load of 122.6 N, said composition prepared from a mixture consisting of:
- (A) 50 to 75 parts by weight of polyamide 6, polyamide 6,6, polyamide 12 or mixtures of these polyamides;
- (B) 15 to 30 parts by weight of a polyolefin having a density of from about 0.921 to about 0.96 g/cm.sup.3 onto which an unsaturated carboxylic acid or an unsaturated carboxylic acid derivative has been grafted, the degree of grafting being between about 0.01 and about 1 weight percent with respect to the total weight of grafted and ungrafted polyolefin;
- (C) 10 to 20 parts by weight of a grafted polyolefin elastomer comprising ethylene and propylene units; and,
- (D) sufficient additives selected from the group including stabilizers, anti-friction agents and fillers, so that the sum of the parts by weight of components (A) to (D) of said mixture is 100,
- said mixture being extruded at from about 150 to about 300 rpm to produce a flexible polyamide-containing polymer composition.
- 2. The polyamide-containing polymer composition according to claim 1, having a melt viscosity of about 1,000 to about 1,200 Pa.multidot.s.
- 3. The polyamide-containing polymer composition according to claim 1, wherein component (D) comprises an anti-friction agent selected from the group consisting of stearates and polyethylene waxes or mixtures thereof.
- 4. The polyamide-containing polymer composition according to claim 1, wherein component (D) comprises an anti-friction agent in a quantity of from about 0.5 to about 1.5 weight percent compared to the total weight of the composition.
- 5. The polyamide-containing polymer composition according to claim 4, wherein component (D) comprises from about 0.5 to about 1.0 weight percent of at least one stearate from the group consisting of zinc stearate, aluminum stearate, steroyl stearate, and from 0 to about 0.5 weight percent of a polyethylene wax.
- 6. The polyamide-containing polymer composition according to claim 1, wherein the degree of grafting of component (B) is from about 0.025 to about 0.5 weight percent, with respect to the polyolefin percentage.
- 7. The polyamide-containing polymer composition according to claim 1, comprising 60 to 65 parts by weight of component (A), 20 to 35 parts by weight of component (B) and 15 to 20 parts by weight of component (C).
- 8. The polyamide-containing polymer composition according to claim 1, wherein the polyamide component (A) has a relative viscosity of from about to about 5.5 dl/g, measured as a 1% solution in 98% sulfuric acid at 23.degree. C.
- 9. The polyamide-containing polymer composition according to claim 1, wherein the polyolefin of component (B) has a density of from about 0.94 to about 0.95 g/cm.sup.3 prior to grafting.
- 10. The polyamide-containing polymer composition according to claim 1, wherein the polyolefin of component (B) is polyethylene.
- 11. The polyamide-containing polymer composition according to claim 10, wherein prior to grafting, the polyethylene has a melt index of from about 1 to about 20 g/10 min at 190.degree. C. and under a load of 21.6 kg.
- 12. The polyamide-containing polymer composition according to claim 11, wherein an unsaturated carboxylic acid or a carboxylic acid derivative is grafted onto from about 40 to about 100 weight percent of the polyethylene.
- 13. The polyamide-containing polymer composition according to claim 1, wherein the unsaturated carboxylic acid derivative is maleic acid anhydride and is employed in quantities of about 0.01 to about 1.0 weight percent, with respect to the weight percentage of polyolefin.
- 14. The polyamide-containing polymer composition according to claim 1, wherein the grafted polyolefin elastomer component (C) comprises ethylene, propylene and butene-1 units.
- 15. A shaped object that can be produced by means of injection molding, extruding, coextruding, blow molding or reshaping, wherein the shaped object comprises the polyamide-containing polymer composition according to claim 1.
- 16. The shaped object according to claim 15, wherein the shaped object is a blow molded bag which constitutes the inner layer of a container comprising an outer layer and an inner layer with a propellant disposed therebetween, as well as a valve.
- 17. The shaped object according to claim 16, wherein the outer layer of said container is made of metal.
- 18. The shaped object according to claim 16, wherein the propellant comprises at least one alkane having three to five carbon atoms.
- 19. The polyamide-containing polymer composition according to claim 1, the composition being produced by mixing components (A), (B), (C) and (D) prior to extrusion.
- 20. The polyamide-containing polymer composition according to claim 1, the composition being produced by mixing components (A), (B) and (D), extruding said mixed components to form an extrudate, and subsequently mixing component (C) into said extrudate.
Priority Claims (2)
Number |
Date |
Country |
Kind |
43 09 535.6 |
Mar 1993 |
DEX |
|
44 07 712.2 |
Mar 1994 |
DEX |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims the priority of applications Nos. P 43 09 535.6, filed Mar. 24, 1993, and P 44 07 712.2, filed Mar. 8, 1994, in Germany, the contents of both of which are incorporated herein by reference.
US Referenced Citations (4)
Foreign Referenced Citations (13)
Number |
Date |
Country |
0 261 748 |
Mar 1988 |
EPX |
0 315 451 |
May 1989 |
EPX |
0 337 153 |
Oct 1989 |
EPX |
0 346 148 |
Dec 1989 |
EPX |
0 346 149 |
Dec 1989 |
EPX |
0 397 531 |
Nov 1990 |
EPX |
0 519 248 |
Dec 1992 |
EPX |
27 22 270 |
Dec 1977 |
DEX |
40 29964 |
Apr 1991 |
DEX |
40 10958 |
Oct 1991 |
DEX |
41 31 908 |
Apr 1993 |
DEX |
57-200448 |
Dec 1982 |
JPX |
2 226 035 |
Jun 1990 |
GBX |
Non-Patent Literature Citations (3)
Entry |
European Search Report (Apr. 19, 1995). |
Kirk-Othmer Encyclopedia of Chemical Technology, Fourth Edition, vol. 8, pp. 978-980. |
Quhadi, T., et al. "Low gas permeable thermoplastic elastomers," Popular Plastics & Packaging, vol. 38, pp. 51-53 (1993). |