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US 5,686,641 AGranted
Method for the preparation of organopentasiloxanes
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorTadashi Okawa
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Abstract
A method for the preparation of very pure organopentasiloxane having the hydrogen atom or an aliphatically unsaturated monovalent hydrocarbon group bonded to the silicon atom at one molecular chain terminal and having a hydrolyzable group or groups bonded to the silicon atom at the other molecular chain terminal.
Claims5
A method for preparing an organopentasiloxane having the general formula (IV):
- ##STR29## the method comprising the steps of:
- A) hydrolyzing a compound selected from the group consisting of a 1-acyloxy-organotetrasiloxane having the with general formula (I):
- ##STR30## and first organosiloxane oligomer mixtures having a main component having the general formula (I) to produce a compound selected from the group consisting of 1-hydroxy-organotetrasiloxanes having the general formula (II):
- ##STR31## and second organosiloxane oligomer mixtures having a main component is (II);
- and
- B) condensing the compound produced in step (A) with a hydrolyzable silane having the general formula (III):
- R.sup.3.sub.n SiX.sub.(4-m) (III)
- wherein wherein R.sup.1 is a hydrogen atom or an aliphatically unsaturated monovalent hydrocarbon group, R.sup.2 is a monovalent hydrocarbon group, R.sup.3 is a monovalent hydrocarbon group, X is a hydrolyzable group, and n=0, 1, or 2.
5 more elements
Dependencies are inferred from the claim text.