Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
2008-11-25
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...
C525S474000, C528S401000
Reexamination Certificate
active
07829649
ABSTRACT:
A perfluoropolyether-polyorganosiloxane block copolymer represented by the following formula (1), the block copolymer having a number average molecular weight, reduced to polystyrene, of from 2,000 to 20,000,in-line-formulae description="In-line Formulae" end="lead"?W2-Q-Rf-Q-(W1-Q-Rf-Q)g-W2 (1)in-line-formulae description="In-line Formulae" end="tail"?wherein Rf is a perfluoropolyether block, W1 is a polyorganosiloxane block having at least one group represented by the following formula (2)wherein X is a hydrolyzable group, R1is a C1-4alkyl group or a phenyl group, y is an integer of from 1 to 5, and a is 2 or 3,Q is a C2-12divalent connecting group which may contain an oxygen atom and/or nitrogen atom,W2 is an organosiloxane residue having a group represented by the aforesaid formula (1), and g is an integer of from 1 to 11.
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Koike Noriyuki
Yamaguchi Koichi
Yamane Yuji
Birch & Stewart Kolasch & Birch, LLP
Gulakowski Randy
Nelson Lindsay
Shin-Etsu Chemical Co. , Ltd.
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