Claims
- 1. A polyamide thermoplastic elastomer blend having improved tensile strength and elongation properties comprising (a) 40-90 percent by weight of a EPM or EPDM rubber which has been modified by having grafted thereto an epoxy component having the formula: ##STR3## in which R' is an organic compound having an epoxide functionality and R is selected from the group consisting of hydrogen, an alkyl, aralkyl, cyclic or aromatic group, and (b) 60-10 percent by weight of a polyamide resin in which said rubber is dispersed, said rubber having been cross-linked after dispersion in said polyamide resin by a cross-linking agent selected from the group consisting of peroxides, metal stearates, metal oxides, phenolic resin and sulfur.
- 2. A polyamide thermoplastic elastomer blend according to claim 1, wherein the material grafted onto the EPM or EPDM is glycidyl methacrylate.
- 3. A polyamide thermoplastic elastomer blend according to claim 1 further comprising from 15-50 percent by weight of an unmodified hydrocarbon elastomer dispersed in said polyamide resin prior to the cross-linking of the modified rubber.
- 4. A polyamide thermoplastic elastomer blend according to claim 1 further comprising at least one modifer selected from the group consisting of flame retardants, stabilizers, fillers, plasticizers and oils.
- 5. A polyamide thermoplastic elastomer blend according to claim 1, wherein the polyamide is polycaprolactam.
- 6. A polyamide thermoplastic elastomer blend according to claim 1, wherein the polyamide is poly(undecaneamide).
- 7. A polyamide thermoplastic elastomer blend according to claim 1, wherein dispersion of the EPM or EPDM rubber takes place at a temperature in the range of 190.degree.-300.degree. C.
- 8. A method of producing polyamide elastomer blends having improved tensile strength and elongation properties comprising the steps of dispersing from 40-90 percent by weight of an EPM or EPDM rubber which has been chemically modified by having grafted thereto an epoxy component having the formula: ##STR4## in which R' is an organic compound having an epoxide functionality and R is selected from the group consisting of hydrogen, an alkyl, aralkyl, cyclic or aromatic group, into 60-10 percent by weight of a polyamide resin and cross-linking said rubber after dispersion by means of a cross-linking agent selected from the group consisting of peroxides, metal stearates, metal oxides, phenolic resin and sulfur.
- 9. A method according to claim 8, further comprising dispersing 15-50 percent by weight of an unmodified hydrocarbon elastomer into said polyamide prior to the cross-linking step.
- 10. A method according to claim 8, wherein the material grafted onto the EPM or EPDM is glycidyl methacrylate.
- 11. A method according to claim 8, wherein dispersion of the EPM or EPDM rubber takes place at a temperature in the range of 190.degree.-300.degree. C.
- 12. A method according to claim 8 in which the polyamide thermoplastic elastomer blend is formed by reaction of the components in melt processing equipment.
- 13. A method according to claim 12 in which the components are reacted in melt processing equipment selected from the group consisting of an extruder, brabender plasticorder and banbury mixer.
Parent Case Info
This is a continuation of application Ser. No. 07/625,874, filed on Dec. 11, 1990, now abandoned, which is a divisional of application Ser. No. 07/185,108, filed Apr. 22, 1988, issued as U.S. Pat. No. 5,003,003, on Mar. 26, 1991.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4956501 |
Sunseri et al. |
Sep 1990 |
|
5008342 |
Phadke |
Apr 1991 |
|
5237003 |
Otawa et al. |
Aug 1993 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
185108 |
Apr 1988 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
625874 |
Dec 1990 |
|