US4753997A
Expired / Lapsed
US
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Process for grafting maleic anhydride or styrene-maleic anhydride onto polyolefins
Assignee: Standard Oil Co
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Filing: 1985-11-27
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Granted: 1988-06-28
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Expires: 2005-11-27
Abstract
Abstract A method of grafting maleic anhydride or maleic anhydride/styrene onto a polyolefin, in particular polypropylene comprising mixing maleic anhydride or maleic anhydride-styrene/styrene homologue with the polyolefin in the presence of a catalyst having the formula: ##STR1## wherein X=S, O or N; R 1 and R 2 =an alkyl group, for example C 1 -C 14 or higher; R=H or ##STR2## wherein R 3 , R 4 and R 5 equal H, an alkyl group, (CH 2 ) n COOH, or mixtures thereof; and n=1 to about 6.
Inventors
- 👤 Wen B. Shyu
- 👤 David A. Woodhead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:32
CPC Classifications
C; C08; C08F; C08F255/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
114 words
A method of grafting maleic anhydride onto a polyolefin to provide a graft polymer containing from about 0.2 to 10 weight percent maleic substitution comprising (1) mixing together maleic anhydride, a free radical initiator comprising an organic peroxide, a polyolefin and a catalyst having the following formula: ##STR6## wherein X=S, O or N; R 1 and R 2 =an alkyl group; R=H or ##STR7## wherein R 3 , R 4 and R 5 equal H, an alkyl group, (CH 2 ) n COOH, or mixtures thereof; and n=1 to about 6, and (2) heating said mixture to an elevated temperature for a time sufficient to enable said maleic anhydride to react with said polyolefin.
Claim 2
Independent Claim
114 words
A method of grafting maleic anhydride onto a polyolefin to provide a graft polymer containing from about 0.2 to 10 weight percent maleic substitution comprising (1) mixing together maleic anhydride, a free radical initiator comprising an organic peroxide, a polyolefin and a catalyst having the following formula: ##STR6## wherein X=S, O or N; R 1 and R 2 =an alkyl group; R=H or ##STR7## wherein R 3 , R 4 and R 5 equal H, an alkyl group, (CH 2 ) n COOH, or mixtures thereof; and n=1 to about 6, and (2) heating said mixture to an elevated temperature for a time sufficient to enable said maleic anhydride to react with said polyolefin.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said catalyst comprises a N,N-dialkylethanolamine.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said N,N-dialkylethanolamine is selected from the group consisting of N,N-diisopropylethanolamine and N,N-dimethylethanolamine.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said catlayst comprises an N,N-dialkylaminoethyl acrylate or methacrylate.
Claim 6
Dependent Claim
10 words
The process of claim 3 wherein said polyolefin is polypropylene.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein said polypropylene is used in its molten form.
Claim 8
Dependent Claim
14 words
The process of claim 5 wherein said polypropylene is used in its particulate form.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein a low boiling point polar solvent is added to the mixture.
Claim 10
Dependent Claim
11 words
The method of claim 3 wherein said polyolefin is a copolymer.
Claim 11
Dependent Claim
116 words
The process of grafting a styrene/styrene homologue-maleic anhydride complex onto a polyolefin to provide a graft polymer containing 0.2 to 10 weight percent maleic substitution comprising (1) mixing styrene/styrene homologue-maleic anhydride, polyolefin, a free radical initiator comprising an organic peroxide and a catalyst having the following formula: ##STR8## wherein X=S, O or N; R 1 and R 2 =an alkyl group; R=H or ##STR9## wherein R 3 , R 4 and R 5 equal H, an alkyl group, (CH 2 ) n COOH, or mixtures thereof; and n=1 to about 6, and (2) heating said mixture to an elevated temperature for a time sufficient to enable said styrene/styrene homologue-maleic anhydride complex to react with said polyolefin.
Claim 12
Dependent Claim
116 words
The process of grafting a styrene/styrene homologue-maleic anhydride complex onto a polyolefin to provide a graft polymer containing 0.2 to 10 weight percent maleic substitution comprising (1) mixing styrene/styrene homologue-maleic anhydride, polyolefin, a free radical initiator comprising an organic peroxide and a catalyst having the following formula: ##STR8## wherein X=S, O or N; R 1 and R 2 =an alkyl group; R=H or ##STR9## wherein R 3 , R 4 and R 5 equal H, an alkyl group, (CH 2 ) n COOH, or mixtures thereof; and n=1 to about 6, and (2) heating said mixture to an elevated temperature for a time sufficient to enable said styrene/styrene homologue-maleic anhydride complex to react with said polyolefin.
Claim 13
Dependent Claim
11 words
The method of claim 10 wherein said catalyst comprises a N,N-dialkylethanolamine.
Claim 14
Dependent Claim
18 words
The process of claim 11 wherein said N,N-dialkylethanolamine is selected from the group consisting of N,N-diisopropylethanolamine and N,N-dimethylethanolamine.
Claim 15
Dependent Claim
14 words
The method of claim 10 wherein said catalyst comprises an N,N-dialkylaminoethyl acrylate or methacrylate.
Claim 16
Dependent Claim
10 words
The process of claim 12 wherein said polyolefin is polypropylene.
Claim 17
Dependent Claim
14 words
The process of claim 14 wherein said polypropylene is used in its particulate form.
Claim 18
Dependent Claim
23 words
The process of claim 12 further comprising dissolving said maleic anhydride in said styrene/styrene homologue prior to mixing with said polypropylene and catalyst.
Claim 19
Dependent Claim
14 words
The process of claim 16 wherein said polypropylene is used in its particulate form.
Claim 20
Dependent Claim
19 words
The process of claim 10 wherein said styrene/styrene homologue to maleic anhydride ratio in said mixture is about 1:1.
Claim 21
Dependent Claim
11 words
The process of claim 10 wherein said polyolefin is a copolymer.
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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) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |