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:
Jan. 25, 1983
Filed:
Apr. 09, 1981
Andrea A DeGuia, North Plainfield, NJ (US);
Celanese Corporation, New York, NY (US);
Abstract
The present invention provides a non-burning, non-dripping polyester blend composition in which transesterification is suppressed, as indicated by, e.g., improved heat deflection temperature. The composition comprises (a) approximately 35 to 85 percent by weight of a blend of polyethylene terephthalate and polybutylene terephthalate wherein the polyethylene terephthalate comprises approximately 10 to 25 percent by weight of the blend; (b) approximately 5 to 60 percent by weight of a reinforcing agent; (c) approximately 4 to 15 percent by weight of at least one halogen-containing organic flame retardant compound; and (d) approximately 2 to 10 percent by weight of the amorphous non-abrasive reaction product of antimony trioxide, or a compound of antimony which generates antimony trioxide, and a substrate comprising a hydrous compound of silicon in a weight ratio within the range of approximately 1:1 to 1:4, on an antimony trioxide:substrate basis. The composition may further comprise approximately 0.1 to 8 percent by weight of a thermoplastic phenoxy resin and/or approximately 0.5 to 2.5 percent by weight of a polytetrafluoroethylene resin. The amorphous non-abrasive reaction product is preferably the reaction product of antimony trioxide and talc, preferably in a 25:75 or 45:55 weight ratio. A process for suppressing transesterification in glass reinforced, non-burning, non-dripping polyester blend compositions is also disclosed.