Liquid-crystalline polyorganosiloxanes containing (meth) acrylox

Details Liquid-crystalline polyorganosiloxanes containing (meth) acrylox Liquid-crystalline polyorganosiloxanes containing (meth) acrylox

1989-08-31

1993-05-18

Stoll, Robert L.

Compositions

Liquid crystal compositions

2522996, 25229967, 2522997, 528 26, 528 30, 528 31, 528 32, 556466, 556478, C09K 1952, C08G 7704, C08G 7712, C07F 704

Patent

active

052118770

ABSTRACT:
The present invention relates to liquid-crystalline compounds and to a process for preparing liquid-crystalline polyorganosiloxanes having methacryloxy and/or acryloxy groups by the reaction of organosiloxanes having hydrogen atoms bonded directly to silicon atoms and/or organosilanes which can be condensed to form organosiloxanes having hydrogen atoms bonded directly to silicon atoms, with alkenes and/or alkynes having mesogenic groups, which comprises reacting in a first step the organosiloxanes with an alkene and/or alkyne having at least one non-enolic hydroxyl group protected by a protective group, and in a second step the protective group is removed and the hydroxyl group which is now free is esterified with (meth)acrylic acid, esters, anhydrides and/or halides thereof and thereafter optionally condensing the organosilanes to organosiloxanes.

REFERENCES:
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patent: 4774028 (1988-09-01), Imai et al.
patent: 4908228 (1990-03-01), Lo
patent: 4920184 (1990-04-01), Schafer et al.
patent: 4981607 (1991-01-01), Okawa et al.

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