Solid elastometric block copolymers

Details Solid elastometric block copolymers Solid elastometric block copolymers

1995-05-18

1996-06-25

Warzel, Mark L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525250, 525271, C08F29702

Patent

active

055300685

ABSTRACT:
There are disclosed novel, solid, elastomeric block copolymers with improved resistance to cold flow wherein either 1) the terminal blocks are each a polymer (I polymer) of at least one conjugated diene I, e.g., isoprene, which contains at least five carbon atoms with at least one of each pair of double-bonded carbon atoms in the polymerized diene I units being additionally single-bonded to two carbon atoms; at least one middle or interior block is a hydrogenated polybutadiene (B polymer); and at least one middle or interior block is an essentially straight chain polyethylene (E polymer) resulting from the hydrogenation of a polybutadiene composed of at least 80% of 1,4- units; or 2) the terminal blocks are random IB copolymers of at least one diene I as previously defined and hydrogenated butadiene, and at least one middle or interior block is a straight chain polyethylene (E polymer) as previously defined. The hydrogenated butadiene units in the B polymer or random IB polymer blocks are composed of no more than about 65% of 1,4- units and at least about 35% of 1,2- units.
The foregoing block copolymers may be prepared by selectively hydrogenating substantially all the butadiene units of a precursor block copolymer wherein the precursor blocks of the straight chain polyethylene blocks units are polybutadiene blocks in which at least about 80% of the butadiene units are 1,4- units. A sufficient number of I units in the I polymer blocks or random IB copolymer blocks retain their unsaturation on selective hydrogenation to enable the vulcanization of the block copolymer.

REFERENCES:
patent: 4879349 (1989-11-01), Hoxmeier et al.
patent: 5147939 (1992-09-01), Hellermann et al.
patent: 5229464 (1993-07-01), Erickson et al.
Falk, Journal of Polymer Science: Part A-1, vol. 9, 2617-2623 (1971).
Falk, Die Angewandte Chemie 21 (1972) 17-23 (No. 236).
Mohajer et al., Polymer 1982, vol. 23, Sep., 1523-1535.

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