Method for preparation of organopentasiloxane
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorTadashi Okawa
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Abstract
A process for the production of organopentasiloxane represented by the general formula: ##STR1## wherein R.sup.1 is an acryloyloxy-containing monovalent organic group or a methacryloyloxy-containing monovalent organic group; R.sup.3 is a monovalent hydrocarbon group; X is a hydrolytic group; and the subscript n is 0, 1, or 2; which is characterized subjecting (A) 1-hydroxy-organotetrasiloxane, or an organosiloxane oligomer mixture comprising it as the main component, which is obtained by hydrolyzing 1-acyloxy-organotetrasiloxane or an oganosiloxane oligomer mixture comprising it as the main component; and (B) hydrolytic silane represented by the general formula R.sup.3.sub.n SiX.sub.(4-n) to a condensation reaction.
Claims30
A process for the production of an organopentasiloxane, comprising the step of (A) condensing a 1-hydroxy-organotetrasiloxane with a hydrolytic silane, wherein:
- the 1-hydroxy-organotetrasiloxane has the general formula:
- ##STR18## wherein R.sup.1 is an acryloyloxy-containing monovalent organic group or a methacryloyloxy-containing monovalent organic group, and
- the hydrolytic silane has the general formula:
- R.sup.3.sub.n SiX.sub.(4-n)
- wherein R.sup.3 is a monovalent hydrocarbon group, X is a hydrolytic group, and the subscript n is 0, 1, or 2.
Dependencies are inferred from the claim text.