Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2006-07-04
2006-07-04
Mulcahy, Peter D. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C524S052000, C524S506000, C524S571000
Reexamination Certificate
active
07071251
ABSTRACT:
The invention relates to a tire having at least one component (e.g. tread) of a rubber composition comprised of a styrene/butadiene elastomer composite comprised of a styrene/butadiene elastomer and a functionalized styrene/butadiene elastomer containing an internal silicon atom therein as a part of the elastomer, and at least one pendent silanol group and/or siloxy group from said silicon atom. Said elastomer composite is comprised of a significant polymodal (e.g. bimodal) molecular weight distribution between said styrene/butadiene elastomer and said functionalized styrene/butadiene elastomer. Said rubber composition contains synthetic, precipitated silica aggregates having hydroxyl groups on their surface which may be pre-treated (hydrophobated) to reduce hydroxyl groups contained on their surface prior to blending with said styrene/butadiene composite. Said rubber composition may contain a dispersion therein of a silica/plasticizer composite. Said rubber composition may be prepared by blending two bis(3-triethoxysilylpropyl) polysulfide coupling agents therewith, namely blending such polysulfide having an average of from 2 to 2.5 connecting sulfur atoms in its polysulfidic bridge in a non-productive mixing stage in the absence of addition of free sulfur and subsequently blending such polysulfide having an average of from 3.5 to 4 connecting sulfur atoms in its polysulfidic bridge in a productive mixing stage in combination with addition of free sulfur.
REFERENCES:
patent: 5403374 (1995-04-01), Kitagawa et al.
patent: 5672639 (1997-09-01), Corvasce et al.
patent: 6013718 (2000-01-01), Cabioch et al.
patent: 6071995 (2000-06-01), Labauze
EPO Search Report.
Thielen Georges Marcel Victor
Weydert Marc
Mulcahy Peter D.
The Goodyear Tire & Rubber Company
Young, Jr. Henry C.
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