Process for preparing polysiloxazane compositions and the produc

Details Process for preparing polysiloxazane compositions and the produc Process for preparing polysiloxazane compositions and the produc

1988-12-23

1991-04-23

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

501 92, 501 97, C08G 7704

Patent

active

050101587

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.

REFERENCES:
patent: 3853567 (1974-12-01), Verbeek
patent: 4612383 (1986-09-01), Laine et al.
patent: 4788309 (1988-11-01), Laine et al.

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