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:
Nov. 24, 1987
Filed:
Feb. 28, 1986
William L Hergenrother, Akron, OH (US);
Arthur W Greenstreet, Clinton, OH (US);
The Firestone Tire & Rubber Company, Akron, OH (US);
Abstract
A process for the rapid bulk polymerization of polybutadiene/nylon-6 block copolymers comprises the steps of preparing a mixture comprising from about 100 to about 50 parts by weight of a low molecular weight polybutadiene terminated by an isocyanate or isothiocyanate and end-capped with caprolactam providing a stable imide type terminated polymer, with from about 0 to about 50 parts by weight of a dry non-cold flowing rubber neutralized with caprolactam, charging the polymer mixture without hydrolyzing the end-capped polybutadiene to a reaction vessel with caprolactam and polymerizing the caprolactam at a temperature sufficient to flash off any solvents introduced during the step of preparing to form a block copolymer with the end-capped polybutadiene. The process of the present invention is also applicable to the rapid polymerization of other block copolymers formed from anionically polymerized cold flowing rubbers terminated by a compound selected from the group consisting of isocyanates and isothiocyanates and end-capped with an amide containing compound providing a stable imide type terminated rubber and mixed with a non-cold flowing rubber terminated with an amide containing compound which mixture is then charged to a reaction vessel without hydrolyzation with a monomer having an active hydrogen other than a monomer utilized to form a polymer present in the polymer mixture and polymerizing the monomer at a temperature sufficient to flash off any solvents introduced during the step of preparing.