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Polyproplene-high trans 1,4-polybutadiene blends
| Details |
Inventors: Bauer, Richard G.;
Assignee: The Goodyear Tire & Rubber Company (Akron, OH)
Primary Examiner: Seccuro, Jr.; Carman J.
Assistant Examiner:
Attorney, Agent or Firm: Hendricks; Bruce J.
The present invention relates to a blend of polypropylene and a trans-1,4-polybutadiene rubber in which the content of trans-1,4 bonds is 65 weight percent or more. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A composition comprising a blend of (a) about 1 to 99 parts by weight of polypropylene and (b) about 99 to 1 parts by weight of trans 1,4-polybutadiene rubber wherein the trans 1,4-polybutadiene rubber has a 75 to 85 weight percent of its butadiene weight units of trans 1,4-isomeric structure, about 12 to 18 weight percent of its units of a vinyl 1,2-structure and 2 to 8 weight percent of its units of a cis-1,4-structure and in its uncured state the trans 1,4-polybutadiene exhibits a first major melting point ranging from about 35.
degree.
C.
to about 45.
degree.
C.
and a second minor melting point ranging from about 55.
degree.
C.
to 65.
degree.
C.
and the first and second melting points are separated by at least 15.
degree.
C.
2.
The composition of claim 1 comprising a blend of from about (a) from about 60 to about 90 parts by weight of polypropylene and (b) about 40 to about 10 parts by weight of a trans 1,4-polybutadiene.
3.
The composition of claim 1 wherein in addition to the polypropylene and trans-1,4-polybutadiene, a compatibilizing agent is used which is selected from the group consisting of peroxides, sulfur compounds and bismaleimides.
4.
The composition of claim 3 wherein the compatibilizing agent is m-phenylenebismaleimide.
Description:
BACKGROUND OF THE INVENTION Thermoplastic blends containing mixtures of dissimilar plastics and dissimilar rubbers are known.
For example, in U.
S.
Pat.
No.
4,338,413, there is described a ternary blend of about 20 to 98 parts by weight of a plastic and about 80 to 2 parts by weight of cured particulate rubber.
The plastic comprises about 10 to 90 parts by weight of crystalline polyolefin polymer and 90 to 10 parts by weight of nylon.
An example of a crystalline polyolefin polymer is polypropylene.
Examples of cured particulate rubber include EPDM, nitrile rubber, natural or synthetic polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber and polyisobutylene rubber.
One undesirable aspect of such blends is that the properties of the blend generally lack any practical utility because of the significant disparity of the individual component polymers
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Adhesives and Rubbers 
