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:
Feb. 14, 1978
Filed:
Jun. 01, 1977
Ronald L Dieck, Lancaster, PA (US);
Edwin J Quinn, Lancaster, PA (US);
Armstrong Cork Company, Lancaster, PA (US);
Abstract
Polyphosphazene blends and foams thereof are described. The blends comprise of at least one polyphosphazene copolymer having a Young's Modulus of up to about 5.times.10.sup.8 dynes/cm.sup.2 and at least one polyphosphazene homopolymer or copolymer having a Young's Modulus of at least about 5.times.10.sup.8 dynes/cm.sup.2. The copolymers used to prepare the blends comprise randomly repeating units represented by the formulas ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and are hydrogen, a C.sub.1 -C.sub.10 linear or branched alkyl radical, or a C.sub.1 -C.sub.4 linear or branched alkoxy radical substituted on any sterically permissible position on the phenoxy group, with the proviso that when R.sub.2 is alkoxy, R.sub.1 and R.sub.2 are different. The blends of this invention can be formed into sheets or films, or into flexible or semi-rigid foams. The blends are extremely fire retardant and produce low smoke loads, or essentially no smoke, when heated in an open flame.