Abstract: The present invention relates to a method for thermal crosslinking of adhesives and also to products produced with these adhesives. An object of the invention is to provide a method for thermal crosslinking of adhesives where the crosslinking is covalent and (initiated by a chemical or physical stimulus) reversible. As and when required, the crosslinking method can also be configured to result in a covalent, irreversible network.
Abstract: The present invention relates to a method of producing a polymerizable phosphate containing at least one selected from polymerizable phosphates represented by formula (II), (III) or (IV) by a batch reaction, including a step of adding a compound represented by formula (I) into a mixture of a polymerizable phosphate reaction product containing at least one selected from polymerizable phosphates represented by formula (II), (III) or (IV), obtained by a pre-batch reaction, and phosphoric acid anhydride to react them: wherein R1 represents H or a C1-4 alkyl group, R2 represents a C2-6 alkylene group and n denotes an integer from 1 to 3.
Abstract: Phosphonamide compounds and methods of forming those compounds are provided. The inventive methods comprise forming a template opened-ring phosphonamide compound and optionally subjecting the template to a ring-closing metathesis reaction in the presence of a ring-closing catalyst (e.g., a Grubbs catalyst) to yield a heterocyclic phosphonamide. Advantageously, the template structures can be provided with a wide array of functional groups (e.g., amino acid side chains, peptides) chosen to provide particular properties to the compound.
Abstract: Process for preparing alkanephosphonic anhydrides of the formula (I) ##STR1## where R is straight-chain or branched unsubstituted C.sub.1 -C.sub.6 -alkyl and n.gtoreq.3, which comprises pyrolytically eliminating water from an alkanephosphonic acid of the formula (II) or a pyroalkanephosphonic acid of the formula (III) ##STR2## where R is straight-chain or branched C.sub.1 -C.sub.6 -alkyl, without addition of solvent and removing the water from the reaction mixture by means of an inert gas stream.
November 2, 1995
Date of Patent:
January 20, 1998
Carl Christoph Mollenkopf, Ernst Ingo Leupold, Gunter Roscher
Abstract: Process for preparing phosphonic anhydrides of the formula (I) ##STR1## in which R is (C.sub.1 -C.sub.10)-alkyl which is unsubstituted or substituted by alkyl groups, alkoxy groups, fluorine, chlorine or bromine atoms, nitro groups, cyano groups, trifluoromethyl groups, phenyl groups, it being possible for the phenyl radical in turn to carry alkyl groups, alkoxy groups, fluorine, chlorine, bromine atoms, nitro groups, cyano groups or alkoxycarbonyl groups, and n.gtoreq.3, by reacting a phosphonic acid of the formula (II) ##STR2## in which R has the meaning given, with diketene, if appropriate at elevated temperature.
Abstract: Process for the preparation of pure propanephosphonic anhydride, which comprises distilling crude, impure propanephosphonic anhydride having an average degree of polymerization of 20 to 200 and containing less than 0.5% by weight of water by heating to 230 to 300.degree. C. under a pressure of 0.1 to 100 mbar, pure propanephosphonic anhydride having an average degree of polymerization of 20 to 60 being obtained.