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:
Sep. 09, 2014
Filed:
Oct. 27, 2010
Santiague Pierre, Liege, BE;
Alain Thielen, Thimister, BE;
Davide Cammarata, Liege, BE;
Cabot Corporation, Boston, MA (US);
Abstract
A masterbatch for pressure pipe applications is disclosed. The masterbatch includes carbon black in a concentration that is in excess of 40 weight percent (wt %) of the masterbatch, and a high-density polyethylene (HDPE) carrier resin in a concentration that is in the range of 40 to 60 wt % of the masterbatch and has a melt flow index above 100 g/10 min at 2.16 kg/190° C. and a weight average molecular weight (Mw) that is less than 100000. The masterbatch may further include one or more additives (e.g., lubricant and/or an anti-oxidant). In some embodiments, microdispersion of carbon black in the masterbatch is rated less than 3 (according to ISO 18553). In one specific case, 98% or more of observed carbon black agglomerates are less than 30 microns. The masterbatch may be included, for example, in a pressure pipe compound where it is diluted with a base polymer.