Abstract: Substituted spiro 2H-1-benzopyran-2,3'-(3H)-naphtho(2,1-b)pyrans particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

Abstract: Substituted spiropyrans particularly suitable for use as precursors to stable pyrylium salts are disclosed.

Abstract: Substituted Spirobi[2H-1-benzopyrans] particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

Abstract: The present invention relates to processes for fixing photo-induced colored derivatives of spiropryans in solvent and solid solutions, and to compositions in which said photo-induced colored derivatives may be fixed, said processes comprising irradiating solvent or solid solutions comprising a spiropryan and an iodonium salt.

Abstract: Substituted spirobi[2H-1-benzopyrans] particularly suitable for use as precursors to stable colored pyrylium salts are disclosed.

Abstract: A process is disclosed for the catalytically-induced preparation of phosphazene polymers. Cyclic halophosphazenes are polymerized in the presence of a catalytically sufficient amount of a compound having the formula M(OR').sub.x where M is an alkali metal or alkaline earth metal, x is equal to the valence of the metal and R' is C.sub.1 to C.sub.10 linear or branched alkyl, C.sub.1 to C.sub.10 substituted linear or branched alkyl, the substituent selected from the group consisting of nitro, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkoxy, C.sub.6 to C.sub.10 aryl and C.sub.6 to C.sub.10 aryloxy, or N.sub.3 P.sub.3 Cl.sub.z (OR').sub.6-z wherein R' is as defined above and z equals 0 to 5.

Abstract: A process is disclosed for the catalytically-induced preparation of phosphazene polymers. Cyclic halophosphazenes are polymerized in the presence of a catalytically sufficient amount of a compound having the formula M(OR').sub.x where M is an alkali metal or alkaline earth metal, x is equal to the valence of the metal and R' is C.sub.1 to C.sub.10 linear or branched alkyl, C.sub.1 to C.sub.10 substituted linear or branched alkyl, the substituent selected from the group consisting of nitro, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkoxy, C.sub.6 to C.sub.10 aryl and C.sub.6 to C.sub.10 aryloxy, or N.sub.3 P.sub.3 Cl.sub.z (OR').sub.6-z wherein R' is as defined above and z equals 0 to 5.

Abstract: A process is disclosed for the catalytically-induced preparation of phosphazene polymers. Cyclic halophosphazenes are polymerized in the presence of a catalytically sufficient amount of a Lewis acid catalyst.

Abstract: Polymers comprising randomly repeating units of the general formula ##STR1## wherein R.sub.1 is linear or branched C.sub.1 -C.sub.10 alkoxy, R.sub.2 is linear or branched C.sub.1 -C.sub.10 alkyl, hydrogen or halogen, and W is C.sub.2 to C.sub.10 alkenyl-substituted aryloxy. These novel polymers are elastomers and may be used to form flexible and semirigid foams and coatings. They display good fire retardance and low smoke levels.

Abstract: A process is disclosed for the catalytically-induced preparation of phosphazene polymers. Cyclic halophosphazenes are polymerized in the presence of a catalytically sufficient amount of a compound having the formula M(OR').sub.x where M is an alkali metal or alkaline earth metal, x is equal to the valence of the metal and R' is C.sub.1 to C.sub.10 linear or branched alkyl, C.sub.1 to C.sub.10 substituted linear or branched alkyl, the substituent selected from the group consisting of nitro, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkoxy, C.sub.6 to C.sub.10 aryl and C.sub.6 to C.sub.10 aryloxy, or N.sub.3 P.sub.3 Cl.sub.z (OR').sub.6-z wherein R' is as defined above and z equals 0 to 5.BACKGROUND OF THE INVENTIONThe present invention relates to a process for the preparation of phosphazene polymers. More specifically, the present invention relates to a method for catalytically producing polyphosphazenes.

Abstract: Polymers comprising randomly repeating units of the general formula ##STR1## wherein R.sub.1 is linear or branched C.sub.1 -C.sub.10 alkoxy, R.sub.2 is linear or branched C.sub.1 -C.sub.10 alkyl, hydrogen or halogen, and W is C.sub.2 to C.sub.10 alkenyl-substituted aryloxy. These novel polymers are elastomers and may be used to form flexible and semirigid foams and coatings. They display good fire retardance and low smoke levels.

Abstract: Poly(aryloxyphosphazene) polymers and foams thereof having di(C.sub.1 -C.sub.10)alkylaminophenoxy groups are described. The polymers consist of the units which occur in a nonregular fashion and are represented by the following general formula: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and are C.sub.1 -C.sub.10 linear or branched alkyl radical. Copolymeric dialkylaminoaryloxy-aryloxyphosphazenes are disclosed represented by units of the general formula: ##STR2## wherein R.sub.1 and R.sub.2 are defined above and R represents hydrogen, halogen, C.sub.1 -C.sub.10 linear or branched alkyl radical, or C.sub.1 -C.sub.4 linear or branched alkoxy radical substituted on any sterically permissible position on the other phenoxy group. The radical NR.sub.1 R.sub.2 is substituted in the meta or para position on the phenoxy radical. The polymers are elastomers, have desirable tensile strengths and may be used to form flexible or semi-rigid films, sheets, and foams.

Abstract: A polyurethane-urea composition is described that is highly resistant to textile fiber-dressings. The composition is a product from the reaction of an ester urethane prepolymer formed from the reaction of a diisocyanate and a hydroxy-terminated polyester of equivalent weight 400-1,000 in which the ratio of isocyanate functionality:hydroxy functionality is from 2.0:1 to 4.0:1; and an excess of water.