Rubber composition

Details Rubber composition Rubber composition

2005-08-09

2005-08-09

Mullis, Jeffrey (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...

C525S099000

Reexamination Certificate

active

06927255

ABSTRACT:
A rubber composition comprising (i) an incompatible polymer blend of at least two diene rubbers selected from rubbers containing a conjugated diene and, optionally, an aromatic vinyl monomer and forming two polymer phases (A) and (B), and (ii) 0.1 to 20 parts by weight, based upon 100 parts by weight of the total polymer component including the block copolymer, of a block copolymer having at least two mutually incompatible blocks (a) and (b), wherein the block (a) is compatible with the polymer phase (A) and incompatible with the polymer phase (B) and the block (b) is compatible with the polymer phase (B) and incompatible with the polymer phase (A), and composed of a conjugated diene and, optionally, an aromatic vinyl monomer, and wherein the molecular weights of the polymers forming the polymer phases (A) and (B) satisfy the specified equations (I) and (II) mentioned in the specification.

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Baulek et al., “Natural Rubber and Butadiene Rubber Blend Using Diblock Copolymer of Isoprene- Butadiene as Compatibilizer,”Journal of Applied Polymer Science, vol. 49, pp. 807-814 (1993).
Zanzig et al., “IBR Block Copolymers as Compatibilizers in NR/BR Blends,”Rubber Chemistry and Technology, vol. 66, pp. 538-549 (1993).

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