Process for the preparation of branched polyorganosiloxanes

Details Process for the preparation of branched polyorganosiloxanes Process for the preparation of branched polyorganosiloxanes

2008-08-07

2010-11-09

Gulakowski, Randy (Department: 1796)

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

Synthetic resins

From silicon reactant having at least one...

C528S029000, C528S031000

Reexamination Certificate

active

07829647

ABSTRACT:
The invention relates to a process for the preparation of branched siloxanes containing R—SiO3/2units, where R=organic radical, wherein straight-chain polysiloxanes containing silane hydrogen in the polymer chain are reacted in the presence of ammonium or metal carboxylates as a catalyst in the absence of hydroxy-functional organic compounds, and to siloxanes thus prepared and the use thereof in the preparation of polyurethane foams and antifoam formulations.

REFERENCES:
patent: 3372133 (1968-03-01), Krantz
patent: 3398177 (1968-08-01), Franklin
patent: 4202831 (1980-05-01), Schlak et al.
patent: 6284908 (2001-09-01), Loy et al.
patent: 7053166 (2006-05-01), Brehm et al.
patent: 2004/0138399 (2004-07-01), MacKinnon et al.
patent: 2006/0241268 (2006-10-01), Ochs
patent: 2006/0241269 (2006-10-01), Ochs
patent: 1 460 098 (2004-09-01), None
Walter Noll “Chemie Und Technologie der Silicone” 1968, pp. 163-208 plus cover page.
Walter Noll “Chemistry and Technology of Silicones” 1968, pp. 1-42 plus cover page.

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