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:
Apr. 23, 1991
Filed:
Dec. 23, 1988
Christian Colombier, Lyon, FR;
Jean-Pierre Cuer, Francheville le Haut, FR;
Atochem, Puteaux, FR;
Abstract
A process for the preparation of novel polysiloxazane compositions which comprises reacting at least one halosilane having the formula (R.sub.1).sub.a (R.sub.2).sub.b Si(Y).sub.4-(a+b) with at least one hydrazine having the formula NHR.sub.3 -NHR.sub.4 and water, wherein R.sub.1 and R.sub.2 are a hydrogen atom or a methyl, ethyl, vinyl or phenyl radical; R.sub.3 and R.sub.4 are hydrogen atoms, Y is a halogen atom and (a+b) is an integer between 0 and 3 and preferably 2. Polysiloxazane polymer compositions formed with polysiloxazanes prepared by the process described above comprise units of formula: ##STR1## combined with units of formula: ##STR2## and, if desired, units of formula: ##STR3## and, if desired, with units of formula: ##STR4## wherein radicals R.sub.1, R.sub.2, R.sub.3 and R.sub.4, which may be identical or different, may denote a hydrogen atom, a saturated or unsaturated aliphatic hydrocarbon radical or a mono- or polycyclic aryl, alkylaryl or arylalkyl radical, and wherein these radicals have a total molecular mass greater than 350.