Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1977-06-20
1979-03-06
Jacobs, Lewis T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
252 1, 260 37N, 260 4575M, 260 4575N, 260 4575P, 260859R, 521124, C08J 900
Patent
active
041430026
ABSTRACT:
Improvements in polymer/polyol compositions which are convertible by reaction with polyisocyanates to polyurethanes which are pigmented to a medium to dark color and which inherently chalk upon exposure to weather and wherein the polymer of the polymer/polyol composition is dispersed in the polyol thereof and is formed from one or more polymerizable ethylenically unsaturated monomers. The improvement provides to said polyurethanes resistance to chalking on exposure to weather and in one embodiment comprises the presence, in the polymer/polyol compositions used to make the polyurethanes, of a metallocene from the class consisting of ferrocene, ferrocene derivatives, cobaltocene and nickelocene in an amount effective to provide chalk resistance. Optionally, the metallocene can be present in the polyisocyanate composition instead of the polymer/polyol composition.
Improved dark colored polyurethanes are made by reacting a mixture comprising (a) a polymer/polyol composition and (b) an organic polyisocyanate in the presence of (c) a catalyst for the reaction of (a) and (b), (d) a metalocene, preferably ferrocene, or a ferrocene polymer and (e) a medium to dark pigment to produce the polyurethane.
REFERENCES:
patent: 3766131 (1973-10-01), Arkles
patent: 3847871 (1974-11-01), Stephens et al.
patent: 3926881 (1975-12-01), Kracklauer
J. Polymer Science; 1961; vol. 54; pp. 651-656.
Macromolecules; 1971; vol. 4; pp. 155-161, 291-297.
J. Paint Technology; 1974; vol. 46; pp. 35-40; and 1967, vol. 39, pp. 569-592.
ACS Div. Org. Coatings and Plastics Chemistry; 1975; vol. 35; pp. 251-254.
Jacobs Lewis T.
Trautlein Eugene C.
Union Carbide Corporation
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