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| Vegetable oil extended polyurethane systems |
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Starch composite reinforced rubber composition and tire with at least one component thereof
| Details |
Inventors: Corvasce, Filomeno Gennaro; Linster, Tom Dominique; Thielen, Georges;
Assignee: The Goodyear Tire & Rubber Company (Akron, OH)
Primary Examiner: Mulcahy; Peter D.
Assistant Examiner:
Attorney, Agent or Firm: Young, Jr.; Henry C.
The present invention relates to a rubber composition containing a starch/plasticizer composite and to pneumatic tires having at least one component comprised of such rubber composition. Such tire component can be, for example, its circumferential tread or other component of the tire. The starch/plasticizer composite can be a composite of starch and plasticizer such as, for example, poly(ethylenevinyl alcohol) and/or cellulose acetate or any suitable plasticizer which results in such starch/plasticizer composite having a melting point below that of the starch alone, and particularly below about 160.degree. C., and to thereby enable the starch to be more processable with conventional elastomer composition processing equipment. In the practice of this invention, a rubber composition comprises at least one elastomer, a starch/plasticizer composite, optionally at least one coupler and, optionally, at least one of carbon black and silica reinforcement alone or in conjunction with another reinforcing or non-reinforcing filler. |
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DETAILED DESCRIPTION What is claimed is: 1.
A rubber composition is provided which comprises (A) 100 parts by weight of at least one diene-based elastomer, (B) about 0.
1 to about 120 phr of at least one reinforcing filler for said elastomer(s) comprised of at least one starch/synthetic plasticizer composite and (C) a coupler for said starch composite, where said coupler has a moiety reactive with hydroxyl groups contained on the surface of said starch composite and another moiety interactive with the said elastomer; wherein said starch is composed of amylose units and amylopectin units in a ratio of about 15/85 to about 35/65, and has a softening point according to ASTM No.
D1228 in a range of about 180.
degree.
C.
to about 220.
degree.
C.
provided, however, that said starch/plasticizer composite has a softening point in a range of about 110 to about 160.
degree.
C.
according to ASTM No.
D1228.
2.
The rubber composition of claim 1 containing about 25 to about 90 phr of said reinforcing filler (B) where said reinforcing filler is composed of (i) about 5 to about 70 phr of said starch/plasticizer composite and about 20 to about 85 phr of reinforcing carbon black.
3.
The rubber composition of claim 1 containing about 25 to about 90 phr of said reinforcing filler (B) where said reinforcing filler is composed of (i) about 5 to about 70 phr of said starch/plasticizer composite and (ii) about 20 to about 85 phr of precipitated silica and carbon black, wherein the weight ratio of silica and carbon black is in a range of about 0.
1 to about 10/1, and a said coupler (C) as a coupler for (1) both of said starch/plasticizer composite and said silica to (2) said elastomer(s) by having a moiety reactive with one or more hydroxyl groups on said composite and with said silica and another moiety reactive with said elastomer(s).
4.
The rubber composition of claim 1 containing about 25 to about 90 phr of said reinforcing filler (B) composed of (i) about 5 to about 70 phr of said starch/plasticizer composite, (ii) zero to about 85 phr of carbon black and/or precipitated silica, wherein the weight ratio of silica to carbon black, if silica is used, is in a range of about 0
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Adhesives and Rubbers 
