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:
Mar. 25, 1980
Filed:
Nov. 09, 1978
Robert J Knopf, Saint Albans, WV (US);
Kenneth L Hoy, Saint Albans, WV (US);
Union Carbide Corporation, New York, NY (US);
Abstract
Polymers which comprise polymer chains along which the proportion of mer units provided by a first heterocyclic monomer gradually increases in a given chain length as the proportion of mer units provided by a second heterocyclic monomer gradually decreases along said chain length. In one form, the portions of the polymers adjacent one end of the given chain lengths have about 100% of mer units provided by the first monomer and about 0% of mer units provided by the second monomer and the portions adjacent the other end of the given chain lengths have about 0% of mer units provided by the first monomer and about 100% of mer units provided by the second monomer. Additional forms of polymers are disclosed. Process for producing such polymers comprising introducing at least one primarily polymerizable feed composition comprising at least one of the monomers described above from at least one primary feed source to a polymerization zone, the primary polymerizable feed composition continually varying in compositional content of the monomers therein during said continuous introduction; simultaneously adding to primary feed source at least one different secondary polymerizable feed composition comprising at least one different monomer as described above from at least one secondary feed source so as to continually change the compositional content of the polymerizable monomers in the primary polymerizable feed composition in the primary feed source; and continuously polymerizing the primary polymerizable feed composition introduced to the polymerization zone until desired polymerization has been achieved. The method of this invention is particularly useful in controlling the ratio of primary to secondary hydroxyl terminal groups in the product.