Patent US2987501A successfully refreshed from Google Patents.
US2987501A
Expired / Lapsed
US
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Process for making graft copolymers of polyethylene and polypropylene
Assignee: Dow Chemical Co
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Filing: 1958-11-05
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Granted: 1961-06-06
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Expires: 1978-11-05
Abstract
No abstract record available.
Inventors
- 👤 James K Rieke
- 👤 Moore Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:32
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/023; Y; Y10; Y10S; Y10S8/00; Y10S8/09; Y10S8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR MAKING A GRAFT COPOLYMER WHICH COMPRISES REACTING A NORMALLY SOLID POLYMERIZED OLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND POLYPROPYLENE WITH A NITROGEN OXIDE SELECTED FROM THE GROUP CONSISTING OF NITROGEN DIOXIDE OF THE FORMULA NO2, DINITROGEN TETROXIDE OF THE FORMULA N2O4 AND MIXTURES THEREOF, AT TEMPERATURES BETWEEN 20* AND 100* C., WHEREBY REACTIVE SITES ARE PRODUCED ON THE POLYMER MOLECULE, THEN REACTING THE SO-TREATED POLYMER WITH A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, LOWER ALKYL ESTERS OF METHACRYLIC ACID AND LOWER ALKYL ESTERS OF ACRYLIC ACID WHICH ESTERS CONTAIN FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP, BY BRINGING THE NITROGEN OXIDE TREATED POLYOLEFIN INTO CONTACT WITH THE LIQUID MONOMER AT TEMPERATURES BETWEEN 50* AND THE BOILING POINT OF THE MONOMER AT 760 MILLIMETERS ABSOLUTE PRESSURE.
Claim 2
Dependent Claim
135 words
A PROCESS FOR MAKING A GRAFT COPOLYMER WHICH COMPRISES REACTING A NORMALLY SOLID POLYMERIZED OLEFIN SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE AND POLYPROPYLENE WITH A NITROGEN OXIDE SELECTED FROM THE GROUP CONSISTING OF NITROGEN DIOXIDE OF THE FORMULA NO2, DINITROGEN TETROXIDE OF THE FORMULA N2O4 AND MIXTURES THEREOF, AT TEMPERATURES BETWEEN 20* AND 100* C., WHEREBY REACTIVE SITES ARE PRODUCED ON THE POLYMER MOLECULE, THEN REACTING THE SO-TREATED POLYMER WITH A MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, LOWER ALKYL ESTERS OF METHACRYLIC ACID AND LOWER ALKYL ESTERS OF ACRYLIC ACID WHICH ESTERS CONTAIN FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP, BY BRINGING THE NITROGEN OXIDE TREATED POLYOLEFIN INTO CONTACT WITH THE LIQUID MONOMER AT TEMPERATURES BETWEEN 50* AND THE BOILING POINT OF THE MONOMER AT 760 MILLIMETERS ABSOLUTE PRESSURE.
References Cited (Backward Citations)
US2837496A
Cited
FR1161824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |