Patent US4147740A successfully refreshed from Google Patents.
US4147740A
Expired / Lapsed
US
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Graft modified polyethylene process and product
Assignee: General Electric Co
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Filing: 1976-09-15
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Granted: 1979-04-03
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Expires: 1996-09-15
Abstract
Abstract A graft modified polyethylene process is described which comprises contacting polyethylene with an organic peroxide in the presence of an ethylenically unsaturated polycarboxylic acid or derivative thereof at a temperature of from 140°-210° C. The resulting graft modified polyethylene in combination with polyamides provide polymer blends having improved impact properties.
Inventors
- 👤 Roger T. Swiger
- 👤 Peter C. Juliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
100 words
A process which comprises, mixing polyethylene with from 0.1 to 1.5% by weight, based on the weight of unmodified polyethylene, of an ethylenically unsaturated polycarboxylic acid anhydride modifier, under melt conditions at a temperature within the range of from 140° C. to 210° C. in the presence of an organic peroxide having a half life of at least about 60 seconds within said temperature range whereby substantially all of said modifier is grafted onto the polyethylene backbone to produce a graft modified polyethylene, said graft modified polyethylene having a melt viscosity greater than the melt viscosity of said unmodified polyethylene.
Claim 2
Dependent Claim
100 words
A process which comprises, mixing polyethylene with from 0.1 to 1.5% by weight, based on the weight of unmodified polyethylene, of an ethylenically unsaturated polycarboxylic acid anhydride modifier, under melt conditions at a temperature within the range of from 140° C. to 210° C. in the presence of an organic peroxide having a half life of at least about 60 seconds within said temperature range whereby substantially all of said modifier is grafted onto the polyethylene backbone to produce a graft modified polyethylene, said graft modified polyethylene having a melt viscosity greater than the melt viscosity of said unmodified polyethylene.
Claim 3
Dependent Claim
38 words
A process in accordance with claim 1, where the modifier is an ethylenically unsaturated anhydride of the formula, ##STR10## where R is a monovalent radical selected from the class consisting of hydrogen, halogen or a lower alkyl group.
Claim 4
Dependent Claim
16 words
A process in accordance with claim 1, where the organic peroxide is an aliphatic organic peroxide.
Claim 5
Dependent Claim
14 words
A process in accordance with claim 1, where the organic peroxide is dicumyl peroxide.
Claim 6
Dependent Claim
20 words
A process in accordance with claim 1, where the temperature employed is in the range of between 160° C.-180° C.
Claim 7
Dependent Claim
26 words
A process in accordance with claim 1, where there is employed on a weight basis from 0.05-0.5 parts of organic peroxide per 100 parts of polyethylene.
Claim 8
Dependent Claim
26 words
A graft modified polyethylene, of the claim 1 process having from about 5×10 -4 to about 1×10 -1 active ##STR11## sites per 100 grams of polyethylene.
Claim 9
Dependent Claim
11 words
A graft modified low density polyethylene in accordance with claim 7.
Claim 10
Dependent Claim
11 words
A graft modified high density polyethylene in accordance with claim 7.
Claim 11
Dependent Claim
37 words
A process in accordance with claim 1, wherein said organic peroxide is of the formula: ##STR12## where Y is selected from hydrogen and ##STR13## and where R 1 and R 2 are selected from monovalent hydrocarbon radicals.
Claim 12
Dependent Claim
13 words
A process in accordance with claim 2, wherein the modifier is maleic anhydride.
Claim 13
Dependent Claim
13 words
A process in accordance with claim 3, wherein the modifier is maleic anhydride.
Claim 14
Dependent Claim
13 words
A process in accordance with claim 4, wherein the modifier is maleic anhydride.
Claim 15
Dependent Claim
13 words
A process in accordance with claim 5, wherein the modifier is maleic anhydride.
Claim 16
Dependent Claim
13 words
A process in accordance with claim 6, wherein the modifier is maleic anhydride.
Claim 17
Dependent Claim
13 words
A process in accordance with claim 10, wherein the modifier is maleic anhydride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |