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. 30, 2010
Filed:
Jul. 25, 2007
Donald Ellington, Evansville, IN (US);
Yantao Zhu, Evansville, IN (US);
Donald Ellington, Evansville, IN (US);
Yantao Zhu, Evansville, IN (US);
Abstract
The melt strength and hence the processing window of blends of polycarbonate and PBT can be enhanced without degradation in the surface appearance of the article produced when relatively minor amounts of certain selected polymers are added to the blend. For example, a composition that has a thermoforming processing window of at least 15° C. for an article having a weight that is more than 100 grams, may contain 15 to 80% by weight of a polycarbonate resin; 10 to 80% by weight of polybutylene terephthalate, and 1 to 15% by weight of a semicrystalline melt strength enhancer. The melt strength enhancer is polyethylene terephthalate (PET), polycyclohexane-dimethyl terephthalate (PCT), polycyclohexanedimethyl terephthalate glycol (PCT-G), and (poly)ethylene co 1,4 cyclohexanedimethylene terephthlate (PET-G), or a combination thereof.