Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-01-08
1990-10-02
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253328, 5253329, 5253331, 525383, 525388, C08F 806
Patent
active
049608347
ABSTRACT:
Syndiotactic 1,2-polybutadiene can be blended with various rubbers in order to improve the properties thereof. For instance, syndiotactic 1,2-polybutadiene can be blended with rubbers utilized in making tire treads in order to improve the heat build-up and wear characteristics of tires. The interaction and adhesion between syndiotactic 1,2-polybutadiene and rubbers can be improved by carboxylating the syndiotactic 1,2-polybutadiene. The presence of carboxylic acid groups on the syndiotactic 1,2-polybutadiene also greatly improves interaction with fillers commonly utilized in rubber compounding, such as carbon black. This invention discloses a process whereby syndiotactic 1,2-polybutadiene can be easily and inexpensively carboxylated. This invention more specifically discloses a method for preparing carboxylated syndiotactic 1,2-polybutadiene which comprises: (1) reacting syndiotactic 1,2-polybutadiene with hydrogen and carbon monoxide in an organic medium to produce formyl syndiotactic 1,2-polybutadiene, wherein the syndiotactic 1,2-polybutadiene is in the form of small particles having a particle size of less than about 250 microns which are suspended in the organic medium; and (2) reacting the formyl syndiotactic 1,2-polybutadiene with oxygen to produce the carboxylated syndiotactic 1,2-polybutadiene.
REFERENCES:
patent: 3928282 (1975-12-01), Lohr, Jr. et al.
patent: 4513121 (1985-04-01), Hansson et al.
patent: 4704427 (1987-11-01), Kitahara et al.
"Chemical Modification of Diene Polymers Via Homogeneous Hydrogenation and Hydroformylation", 27 Polymer Preprints, No. 2, pp. 95-96 (1986).
Lipman Bernard
Rockhill Alvin T.
The Goodyear Tire & Rubber Company
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