US4857600A
Expired / Lapsed
US
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Process for grafting diacid anhydrides
Assignee: Union Carbide Corp
•
Filing: 1988-05-23
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Granted: 1989-08-15
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Expires: 2008-05-23
Abstract
Abstract A process for grafting an anhydride of an unsaturated aliphatic diacid onto a polyolefin comprising: (a) passing molten polyolefin through at least two injection zones connected in series; (b) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin; and (c) passing the grafted polyolefin, in the molten state, into a devolatilization zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized.
Inventors
- 👤 Laurence H. Gross
- 👤 Thorne M. Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:10
CPC Classifications
C; C08; C08F; C08F255/00
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
104 words
A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises: (a) adding and mixing molten polyolefin, one or more aliphatic diacid anhydride compositions, organic peroxide, and inert organic solvent in a first reaction zone, under reaction conditions, to produce a partially grafted polyolefin product; (b) sequentially passing said partially grafted polyolefin product from said first reaction zone through a series of one or more reaction zones; and (c) mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent with said partially grafted product, under reaction conditions, in each successive reaction zone until the desired level of grafting is achieved.
Claim 2
Dependent Claim
104 words
A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises: (a) adding and mixing molten polyolefin, one or more aliphatic diacid anhydride compositions, organic peroxide, and inert organic solvent in a first reaction zone, under reaction conditions, to produce a partially grafted polyolefin product; (b) sequentially passing said partially grafted polyolefin product from said first reaction zone through a series of one or more reaction zones; and (c) mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent with said partially grafted product, under reaction conditions, in each successive reaction zone until the desired level of grafting is achieved.
Claim 3
Dependent Claim
14 words
The process defined in claim 1 wherein the anhydride has 4 to 20carbon atoms.
Claim 4
Dependent Claim
12 words
The process defined in claim 1 wherein the anhydride is maleic anhydride.
Claim 5
Dependent Claim
11 words
The process defined in claim 1 wherein the solvent is acetone.
Claim 6
Dependent Claim
11 words
The process defined in claim 1 wherein the process is continuous.
Claim 7
Dependent Claim
15 words
The process defined in claim 1 wherein the anhydride has 4 to 8 carbon atoms.
Claim 8
Dependent Claim
17 words
The process defined in claim 1 wherein the solution is introduced into the different zones about simultaneously.
Claim 9
Dependent Claim
33 words
The process defined in claim 1 wherein the solution is introduced along the axis of each reaction zone, said axis running from the upstream end to the downstream end of the reaction zone.
Claim 10
Dependent Claim
15 words
The process defined in claim 1 wherein there are about 3 to 10 reaction zones.
Claim 11
Dependent Claim
14 words
The process defined in claim 1 wherein there are 3 to 6 reaction zones.
Claim 12
Dependent Claim
19 words
The process defined in claim 1 wherein the polyolefin is based on a major proportion of ethylene or propylene.
Claim 13
Dependent Claim
80 words
A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises: (a) continuously adding and mixing molten polyolefin, aliphatic diacid anhydride, organic peroxide, and inert organic solvent in a first reaction zone under reaction conditions; (b) continuously passing the grafted reaction product from said first reaction zone into a second reaction zone; and (c) adding and mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent to said grafted reaction product in said second reaction zone.
Claim 14
Dependent Claim
80 words
A process for producing a polyolefin grafted with an unsaturated aliphatic diacid anhydride which comprises: (a) continuously adding and mixing molten polyolefin, aliphatic diacid anhydride, organic peroxide, and inert organic solvent in a first reaction zone under reaction conditions; (b) continuously passing the grafted reaction product from said first reaction zone into a second reaction zone; and (c) adding and mixing additional aliphatic diacid anhydride, organic peroxide, and inert solvent to said grafted reaction product in said second reaction zone.
Claim 15
Dependent Claim
15 words
The process defined in claim 12 wherein the anhydride has 4 to 20 carbon atoms.
Claim 16
Dependent Claim
12 words
The process defined in claim 12 wherein the anhydride is maleic anhydride.
Claim 17
Dependent Claim
11 words
The process defined in claim 12 wherein the solvent is acetone.
Claim 18
Dependent Claim
11 words
The process defined in claim 12 wherein the process is continuous.
Claim 19
Dependent Claim
15 words
The process defined in claim 12 wherein the anhydride has 4 to 8 carbon atoms.
Claim 20
Dependent Claim
17 words
The process defined in claim 12 wherein the solution is introduced into the different zones about simultaneously.
Claim 21
Dependent Claim
33 words
The process defined in claim 12 wherein the solution is introduced along the axis of each reaction zone, said axis running from the upstream end to the downstream end of the reaction zone.
Claim 22
Dependent Claim
19 words
The process defined in claim 12 wherein the polyolefin is based on a major proportion of ethylene or propylene.
Claim 23
Dependent Claim
80 words
A process for grafting an anhydride of an unsaturated aliphatic diacid onto a polyolefin comprising: (a) passing molten polyolefin through at least two injection zones connected in series; and (b) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin.
Claim 24
Dependent Claim
80 words
A process for grafting an anhydride of an unsaturated aliphatic diacid onto a polyolefin comprising: (a) passing molten polyolefin through at least two injection zones connected in series; and (b) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin.
Claim 25
Dependent Claim
23 words
The process defined in claim 21 including the following additional step: (d) removing essentially all unreacted volatile impurities from the final grafted product.
Claim 26
Dependent Claim
40 words
The process defined in claim 21 including the following additional step: (c) passing the grafted polyolefin, in the molten state, into a devolatilization zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized.
Claim 27
Dependent Claim
15 words
The process defined in claim 22 wherein the anhydride has 4 to 20 carbon atoms.
Claim 28
Dependent Claim
12 words
The process defined in claim 24 wherein the anhydride is maleic anhydride.
Claim 29
Dependent Claim
11 words
The process defined in claim 22 wherein the solvent is acetone.
Claim 30
Dependent Claim
11 words
The process defined in claim 22 wherein the process is continuous.
Claim 31
Dependent Claim
17 words
The process defined in claim 22 wherein the solution is introduced into the different zones about simultaneously.
Claim 32
Dependent Claim
33 words
The process defined in claim 22 wherein the solution is introduced along the axis of the injection zone, said axis running from the upstream end to the downstream end of the injection zone.
Claim 33
Dependent Claim
15 words
The process defined in claim 22 wherein there are about 3 to 10 injection zones.
Claim 34
Dependent Claim
19 words
The process defined in claim 22 wherein the polyolefin is based on a major proportion of ethylene or propylene.
Claim 35
Dependent Claim
136 words
A continuous process for grafting an anhydride of an unsaturated aliphatic diacid having 4 to 20 carbon atoms onto a polyolefin comprising the following steps: (i) introducing the polyolefin into an inlet zone, and melting and mixing same in said zone; (ii) passing the molten polyolefin through at least two injection zones connected in series; (iii) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin; and (iv) passing the grafted polyolefin, in the molten state, into an outlet zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized.
Claim 36
Dependent Claim
136 words
A continuous process for grafting an anhydride of an unsaturated aliphatic diacid having 4 to 20 carbon atoms onto a polyolefin comprising the following steps: (i) introducing the polyolefin into an inlet zone, and melting and mixing same in said zone; (ii) passing the molten polyolefin through at least two injection zones connected in series; (iii) injecting, under grafting conditions, a portion of a solution comprising the anhydride, an organic peroxide catalyst, and an inert organic solvent into the molten polyolefin as it passes through each injection zone, and mixing same in each injection zone until the portion is at least partially grafted onto the polyolefin; and (iv) passing the grafted polyolefin, in the molten state, into an outlet zone, and mixing same in said zone, under devolatilization conditions, until the grafted polyolefin is essentially devolatilized.
Claim 37
Dependent Claim
30 words
The process defined in claim 32 wherein each zone is of sufficient length from upstream end to downstream end to effect melting, reacting, or devolatilization, as the case may be.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |