Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-03-13
1995-11-28
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 64, 525 67, 525 69, 525 72, 525 74, 525 92A, 525 92B, 525 92E, 525 92F, 525 92L, 525 93, 525 95, 525 98, 525 99, C08L 5100, C08L 5300
Patent
active
054709148
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.
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Coolbaugh Thomas S.
Loveless Frederick C.
Matthews Demetreos N.
Keen Malcolm D.
McKillop Alexander J.
Michl Paul R.
Mobil Oil Corporation
Warzel Mark L.
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