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US 2003/0144449 A1Published application
Preparation of linear organosiloxane polymers
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsHiroshi Nakayama, Masao Maruyama, Hiromi Nakabayashi, Masaaki Furuya, Tetsuo Nakanishi
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Abstract
By reacting two types of organosiloxane compounds in the presence of an alkaline compound and under conditions that do not substantially promote equilibration reaction, a linear organosiloxane polymer having a single peak molecular weight distribution is simply and economically produced with minimized formation of cyclics.
Claims3
A process for preparing a linear organosiloxane polymer, comprising the step of
- reacting a compound of the following formula (1) with a compound of the following formula (2) in the presence of an alkaline compound and under conditions that do not substantially promote equilibration reaction, thereby producing a linear organosiloxane polymer having a single peak molecular weight distribution with minimized formation of cyclics,
- formula (1):
- 4
- wherein R1 is each independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, R2 is each independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, and n is an integer of 0 to 500,
- formula (2):
- 5
- wherein R2 is as defined above, R3 is each independently a substituted or unsubstituted monovalent hydrocarbon group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or a hydroxyl group, and m is an integer of 10 to 3,000.
4 more elements
Dependencies are inferred from the claim text.