US Patent 7476718 Process for producing polyoxymethylene
Patent 7476718 was granted and assigned to E.I. Du Pont De Nemours And Company on January, 2009 by the United States Patent and Trademark Office.
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Patent abstract
A process for the polymerization of formaldehyde, comprising contacting formaldehyde in a hydrocarbon solution with an aliphatic anhydride and a quaternary ammonium salt polymerization initiator of the formula:R1R2R3R4N+X−where R1 is an aliphatic or olefinic hydrocarbon group containing about 18 to about 25 carbon atoms; R2, R3, and R4 are each methyl, ethyl, and/or propyl, such that the total number of carbon atoms in R2, R3, and R4 combined is between 3 and 7; and X− is an organic anion.
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US Patent 07476718 Process for producing polyoxymethylene US Patent 7476718 Process for producing polyoxymethylene
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Patent Number
0747671800
Patent Number
747671800
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Infobox
Is a
Current Assignee
Patent Jurisdiction
Patent Number
074767180
Date of Patent
January 13, 2009
0Patent Application Number
111506790
Date Filed
June 10, 2005
0Official Website
Patent Primary Examiner
Edits on 26 Sep, 2022
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Infobox
Is a
Current Assignee
Patent Jurisdiction
Patent Number
074767180
Date of Patent
January 13, 2009
0Patent Application Number
111506790
Date Filed
June 10, 2005
0Official Website
Patent Primary Examiner
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US Patent 07476718 Process for producing polyoxymethylene
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07476718
Date of patent
January 13, 2009
Patent application number
11150679
Date Filed
June 10, 2005
Patent primary examiner
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