US4594386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide grafted EPM blend
Assignee: DSM Copolymer Inc
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Filing: 1983-09-30
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Granted: 1986-06-10
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Expires: 2003-09-30
Abstract
Abstract Impact strength and toughness of polyamide resins are improved by blending resin with up to 50 percent by weight maleic anhydride grafted EPM rubber of low molecular weight and exposing the mixture to elevated temperature during blending.
Inventors
- 👤 Errol J. Olivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:23
CPC Classifications
C; C08; C08L; C08L51/00; C08L51/06; C08L77/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
172 words
A polyamide blend having improved impact strength and toughness consisting essentially of 50-98 parts by weight of the polyamide resin blended with 2-50 parts by weight of grafted and reversibly crosslinked ethylene and propylene copolymer rubber, the base rubber of which is a liquid or semi-liquid of low molecular weight having an RSV within the range of 0.4-3.0% and in which the material grafted onto the EPM is an anhydride having the general formula: ##STR2## or corresponding or derivative thereof having the general formula ##STR3## in which R is an alkylene group having from 1 to 4 carbon atoms, Y is selected from the group consisting of hydrogen, halogen or an organic group having from 1-12 carbon atoms and X is a hydroxyl or ester forming group but in which at least one X is hydroxyl, and in which the crosslinks will be easily disruptable in use whereby the grafted and crosslinked low molecular weight rubber comprises a solid high molecular weight material which converts to a low molecular weight in use.
Claim 2
Dependent Claim
172 words
A polyamide blend having improved impact strength and toughness consisting essentially of 50-98 parts by weight of the polyamide resin blended with 2-50 parts by weight of grafted and reversibly crosslinked ethylene and propylene copolymer rubber, the base rubber of which is a liquid or semi-liquid of low molecular weight having an RSV within the range of 0.4-3.0% and in which the material grafted onto the EPM is an anhydride having the general formula: ##STR2## or corresponding or derivative thereof having the general formula ##STR3## in which R is an alkylene group having from 1 to 4 carbon atoms, Y is selected from the group consisting of hydrogen, halogen or an organic group having from 1-12 carbon atoms and X is a hydroxyl or ester forming group but in which at least one X is hydroxyl, and in which the crosslinks will be easily disruptable in use whereby the grafted and crosslinked low molecular weight rubber comprises a solid high molecular weight material which converts to a low molecular weight in use.
Claim 3
Dependent Claim
30 words
A polyamide blend as claimed in claim 1, in which the propylene is present in the EPM in the ratios of 95-10 moles of ethylene to 5-90 moles of propylene.
Claim 4
Dependent Claim
19 words
A polyamide blend as claimed in claim 1, in which the material grafted onto the EPM is maleic anhydride.
Claim 5
Dependent Claim
24 words
A polyamide blend as claimed in claim 1, in which the material grafted onto the EPM is a maleic acid or mono ester thereof.
Claim 6
Dependent Claim
27 words
A polyamide blend as claimed in claim 1, in which the amount of graft is within the range of 0.5-4.0% of the weight of the rubber cement.
Claim 7
Dependent Claim
24 words
A polyamide blend as claimed in claim 1, in which the amount of graft is within the range of 0.2-5% of the rubber cement.
Claim 8
Dependent Claim
20 words
A polyamide blend as claimed in claim 1, in which the EPM has an RSV within the range of 0.7-2.5.
Claim 9
Dependent Claim
24 words
A polyamide blend as claimed in claim 1, in which the crosslinks are disruptable when heated to a temperature above 125° C. during blending.
Claim 10
Dependent Claim
14 words
A polyamide blend as claimed in claim 1, in which the polyamide is polycaprolactam.
Claim 11
Dependent Claim
14 words
A polyamide blend as claimed in claim 1, in which the polyamide is poly(undecaneamide).
Claim 12
Dependent Claim
59 words
The method of producing a polyamide blend clamied in claim 1, in which the polyamide is blended with the grafted and reversibly crosslinked copolymer rubber at a temperature above 150° F. whereby crosslinks are disrupted to provide a blend component of low molecular weight and high melt flow to optimize mixing and dispersions of blended rubber with the polyamide.
Claim 13
Dependent Claim
15 words
The method as claimed in claim 11, in which the polyamide is a polycaprolactam resin.
Claim 14
Dependent Claim
15 words
The method as claimed in claim 11, in which the polyamide is a poly(undecaneamide) resin.
Claim 15
Dependent Claim
22 words
The method as claimed in claim 11, in which the polyamide and grafted copolymer rubber are blended by co-extrusion at elevated temperature.
Claim 16
Dependent Claim
33 words
The method as claimed claim 11, in which the components are blended in the ratio of 1-50 parts by weight of the grafted EPM rubber to 99-50 parts by weight of the polyamide.
References Cited (Backward Citations)
US3274289A
Cited
US3484403A
Cited
US3676400A
Cited
US3862265A
Cited
US4031062A
Cited
GB1403797A
Cited
DE2420942A1
Cited
US4017557A
Cited
US4174358A
Cited
US4174358B1
Cited
US4026967A
Cited
US4161452A
Cited
JPS559661A
Cited
US4251644A
Cited
EP0029566A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |