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:
Jul. 17, 2018
Filed:
Feb. 21, 2014
Silgan Holdings Inc., Stamford, CT (US);
Juergen Kintscher, Hannover, DE;
Silgan Holdings Inc., Stamford, CT (US);
Abstract
The invention concerns a novel chain-terminated polymeric composition, comprising hydroxyl-terminated polyesters and a method for preparing the composition and the use of the chain-terminated polymeric composition as a plasticizer. They play a predominant role in the field of metal vacuum closures (Twist-Off and Press-On-Twist-Off closures). Selection criteria regarding the suitability of plasticizers in food contact applications are properties such as low plasticizer volatility, low plastisol viscosity, PVC compatibility, softness and resilience of the gasket as well as non-toxicity and high plasticizer migration resistance. The invention concerns the chemical equation of FIG.for obtaining the suggested chain-terminated polymeric composition, wherein x, y, and z are the stoichiometric ratios of dibasic carboxylic acid (DCA), glycerol or polyglycerol (GPG), and monobasic carboxylic acid (MCA). k is the number of methylene groups in the dibasic carboxylic acid, (k+2) is the number of carbon atoms therein, m is the degree of polymerization of polyglycerol used, (m+2) describes the hydroxyl functionality thereof, I is the number of methylene groups in the monobasic carboxylic acid, (l+2) is the number of carbon atoms in the monobasic carboxylic acid, and n is the degree of polymerization of the polyester formed by glycerol or polyglycerol and the dibasic carboxylic acid.