Process for the preparation of SiOC-linked, linear...

Details Process for the preparation of SiOC-linked, linear... Process for the preparation of SiOC-linked, linear...

2007-12-14

2010-11-02

Zimmer, Marc S (Department: 1796)

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

Synthetic resins

From silicon reactant having at least one...

C528S016000, C528S019000, C528S029000

Reexamination Certificate

active

07825205

ABSTRACT:
The invention relates to a process for the preparation of SiOC-linked, linear polydimethylsiloxane-polyoxyalkylene block copolymers having (AB) repeat units, via reaction by methods known per se of polyetherdiols with a stoichiometric excess of α,ω-dihydropolydimethylsiloxanes, in the presence of one or more compounds of elements of main group 13 and/or of transition group 3 as catalyst, which comprises, after completed reaction of the alcohol component, continuing the reaction until no remaining ≡Si(H) groups are detectable by a gas-volumetric method, and also to the compounds thus prepared, and to their use as surfactant additives for the production of polyurethane ether foams.

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B(C6F5)3-Catalyzed Silation of alcohols: a Mild General Method for Synthesis of Silyl Ethers authored by Blackwell et al. and published in J. Org. Chem. (1999), 64, 4887-4892.

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