Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-04-16
1997-09-02
Zemel, Irina S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 98, 525940, C08F29704
Patent
active
056632398
ABSTRACT:
Solid star-branched block copolymers wherein each branch comprises at least two (2) alternating blocks bonded to each other, the free end of each branch being a block of at least one polymerized hydrocarbon conjugated diene (I), e.g. isoprene, containing at least 5 carbon atoms, with at least one carbon atom of each pair of residual double-bonded carbon atoms of polymerized diene (I) units being additionally single-bonded to two carbon atoms, or a copolymer of a least one diene (I) and at least one aryl-substituted olefin, e.g. styrene, the blocks adjacent to said polymerized diene (I) containing blocks constituting at least 50 wt. % of said copolymer and being a polymer of at least one hydrocarbon conjugated diene (B), e.g., 1,3-butadiene, which is different from diene (I) and contains at least four (4) carbons atoms, with each residual double-bonded carbon atom of polymerized conjugated diene (B) units being additionally bonded to a hydrogen atom. After the polymerization is completed, the block copolymer may be selectively hydrogenated, so that each (B) polymer block is hydrogenated to such an extent that it contains substantially none of the original ethylenic unsaturation, while each of the (I) polymer or copolymer blocks retains a sufficient amount of its original ethylenic unsaturation to cure (or vulcanize) the copolymer.
REFERENCES:
patent: 3577357 (1971-05-01), Winkler
patent: 3823109 (1974-07-01), Middlebrook
patent: 3985826 (1976-10-01), Futamura
patent: 4116917 (1978-09-01), Eckert
patent: 4134928 (1979-01-01), Moczygemba
patent: 4162241 (1979-07-01), Canter et al.
patent: 4413098 (1983-11-01), Hattori et al.
patent: 4628072 (1986-12-01), Shiraki et al.
patent: 4657970 (1987-04-01), Shiraki et al.
patent: 4849481 (1989-07-01), Rhodes et al.
patent: 4879349 (1989-11-01), Hoxmeier
patent: 4898914 (1990-02-01), Gergen et al.
patent: 4996266 (1991-02-01), Bronn et al.
patent: 5159022 (1992-10-01), Ikematu et al.
Falk, Journal of Polymer Science: Part A-1, vol. 9, 2617-2623 (1971).
Falk et al., Die Angewandte Makromelekulare Chemie 21 (1972), 17-23 (No. 286).
Mohajer et al., "Hydrogenated linear block copolymers of butadiene and isoprene: effects of variation of composition and sequence architecture on properties," Polymer, 1982, vol. 23, Sep., 1523-1535.
Coolbaugh Thomas S.
Liu Wan-Li
Loveless Frederick C.
Matthews Demetreos N.
Cuomo Lori F.
Mobil Oil Corporation
Santini Dennis P.
Zemel Irina S.
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