Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2000-03-22
2001-02-06
Seidleck, James J. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S343000, C525S347000, C525S351000, C525S374000, C525S375000, C524S262000, C524S086000, C524S188000, C556S427000, C523S213000
Reexamination Certificate
active
06184306
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a compound which is useful in silica-filled rubber compositions and the processing of a sulfur curable rubber composition containing silica.
BACKGROUND OF THE INVENTION
Sulfur containing organosilicon compounds are useful as reactive coupling agents between rubber and silica fillers providing for improved physical properties. They are also useful as adhesion primers for glass, metals and other substrates.
U.S. Pat. Nos. 3,842,111, 3,873,489 and 3,978,103 disclose the preparation of various sulfur containing organosilicon compounds. These organosilicon compounds are prepared by reacting
(a) 2 moles of a compound of the formula
Z-Alk-hal
where hal is a chlorine, bromine or iodine; Z is
where R
1
is an alkyl of 1 to 4 carbon atoms or phenyl and R
2
is alkoxy of 1 to 8 carbon atoms; or cycloalkoxy of 5 to 8 carbon atoms; or alkylmercapto with 1 to 8 carbon atoms; Alk is a divalent aliphatic hydrocarbon or unsaturated hydrocarbon or a cyclic hydrocarbon containing 1 to 18 carbon atoms; with
(b) 1 mole of a compound of the formula
Me
2
S
n
where Me is ammonium or a metal atom and n is a whole number from 2 to 6.
U.S. Pat. No. 4,820,751 and Japanese Patent Application 124400-1984 disclose the use of an asymmetrical siloxy compound in a silica-filled rubber. Representative asymmetrical siloxy compounds contain a benzothizole moiety or thiocarbamyl moiety.
SUMMARY OF THE INVENTION
The present invention relates to asymmetrical siloxy compounds of the formula:
REFERENCES:
patent: 5037872 (1991-08-01), Schwarze et al.
patent: 5916973 (1999-06-01), Zimmer et al.
patent: 0447066 (1991-02-01), None
patent: 0794187 (1997-09-01), None
patent: 0794221 (1997-09-01), None
Agostini Giorgio
Cohen Martin Paul
Edme Materne Thierry Florent
Visel Friedrich
Asinovsky Olga
Hendricks Bruce J
Seidleck James J.
The Goodyear Tire & Rubber Company
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