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. 16, 1999
Filed:
Apr. 11, 1997
Applicant:
Inventors:
James L Dever, Copley Township, OH (US);
James C Gill, Macedonia, OH (US);
Assignee:
Ferro Corporation, Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C08F / ;
U.S. Cl.
CPC ...
252609 ; 524464 ; 524469 ; 525355 ; 525357 ; 525356 ;
Abstract
The present invention provides a new flame-retardant additive comprising brominated syndiotactic polystyrene. The additive has a melting temperature in excess of about 325.degree. C. and it displays a noncrystalline order. The additive also has less than 1500 ppm halogen located on the backbone of the syndiotactic polystyrene as measured in HBr equivalents. The additive provides for better color and improved thermal stability as compared to the use of conventional brominated polystyrene.