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. 18, 2018
Filed:
Jun. 09, 2016
Perstorp Ab, Perstorp, SE;
Mikael Wernersson, Södertälje, SE;
Linh Mong Ngo, Helsingborg, SE;
PERSTORP AB, Perstorp, SE;
Abstract
Disclosed is a process for production of a spiroglycol by subjecting pentaerythritol to reaction in water with hydroxypivaldehyde in presence of a catalytically active amount of at least one acid catalyst and seed particles, wherein pentaerythritol, water, at least one acid catalyst and spiroglycol seed particles are charged to a reaction vessel, equipped with heating/cooling and agitation, and under stirring heated to a predetermined reaction temperature followed by progressive addition of hydroxypivaldehyde. The spiroglycol seed particles are present in an amount of 0.5-1.0% by weight, calculated on pentaerythritol, water, acid catalyst and hydroxypivaldehyde, and the hydroxypivaldehyde is charged at a rate determined over time by monitoring growth and/or formation of yielded spiroglycol particles.