Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-06-21
1978-05-23
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 457P, 260 457PH, 260890, 260956, 260963, 260967, C08K 552, C08L 700, C08L 4700
Patent
active
040909891
ABSTRACT:
Ozone resistance of vulcanized chloroprene homopolymers and copolymers, chlorinated isobutylene/isoprene copolymers, and blends of any of the above with up to equal weight of styrene/butadiene copolymer or natural rubber is improved by incorporating into the polymer or polymer blend prior to vulcanization about 0.5-5 parts per 100 parts by weight of polymer or polymer blend of one or more of bis(5-norbornene-2-methyl) phosphite, tris(5-norbornene-2-methyl) phosphite, and tris(5-norbornene-2-methyl) phosphate. These esters also improve the flex resistance of chloroprene copolymers with sulfur and their blends with styrene-butadiene copolymers or natural rubber. In addition to improving ozone and flex resistance of the above polymers and polymer blends, these esters do not cause staining or discoloration of the vulcanized polymers.
REFERENCES:
patent: 2767206 (1956-10-01), Whetstone
patent: 2853471 (1958-09-01), Beadell
patent: 3172871 (1965-03-01), Malz et al.
patent: 3562210 (1971-02-01), Cassar et al.
patent: 3563947 (1971-02-01), Gruber
patent: 3784651 (1974-01-01), Inamoto et al.
Czaja Donald E.
E. I. Du Pont de Nemours and Company
Fletcher H. H.
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