The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2011
Filed:
May. 04, 2004
Amit K. Sharma, Burlington, NJ (US);
Claude K. Martin, East Windsor, NJ (US);
Aziz Boukhelifa, North Brunswick, NJ (US);
Ning Chen, Plainsboro, NJ (US);
Amit K. Sharma, Burlington, NJ (US);
Claude K. Martin, East Windsor, NJ (US);
Aziz Boukhelifa, North Brunswick, NJ (US);
Ning Chen, Plainsboro, NJ (US);
Rhodia Inc., Cranbury, NJ (US);
Abstract
A method for making a polyether monomer having at least one unsaturated site per molecule and having a desired number of alkoxyl repeating units includes the steps of reacting an active hydrogen-containing monomer having at least one unsaturated site per molecule with an alkyl oxide in the presence of an alkoxylation catalyst and a polymerization inhibitor at a temperature from about 30° C. to less than 45° C. to produce a polyether monomer. In one embodiment, from about 5 to about 1000 parts by weight of a phenothiazine polymerization inhibitor per one million parts by weight of the active hydrogen-containing monomer phenothiazine compound is used as the polymerization inhibitor.