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    Composition comprising polyester-polyisocyanate reaction product and polysulfide polymer
    6.
    发明授权
    Composition comprising polyester-polyisocyanate reaction product and polysulfide polymer 失效
    组合物包含聚酯 - 多异氰酸酯反应产物和多硫化物聚合物

    公开(公告)号：US2929794A

    公开(公告)日：1960-03-22

    申请号：US45576654

    申请日：1954-09-13

    Applicant: LOCKHEED AIRCRAFT CORP

    Inventor： ELI SIMON ,  THOMAS FRANK W

    IPC: C08G18/10 ,  C08G18/30 ,  C08G18/64 ,  C08L75/04 ,  C08L81/00 ,  C09J175/04

    CPC classification number: C08L75/04 ,  C08G18/10 ,  C08G18/302 ,  C08G18/6453 ,  C08L81/00 ,  C08L2666/14 ,  C09J175/04 ,  C08G18/64

    Abstract: Resinous products suitable for coating and sealing purposes are prepared by reacting a diisocyanate or diisothiocyanate with a diol, reacting the product with water and with a bifunctional carboxylic acid or a liquid polyester to form an intermediate polymer and finally cross-linking the intermediate polymer with a compound containing at least three groups reactive with the isocyanate radical. The molar quantity of diisocyanate is in excess of the sum of the molar quantities of all the other reactants used in making the intermediate polymer. The products air cure in thin sections. The products may be mixed with a polysulphides polymer and the curing of the resulting composition assisted by a mixed catalyst system. The polyesters employed are preferably derived at least in part from 1-3 butylene glycol and sebacic acid and have acid numbers from 20 to 150. Ten examples of suitable polyesters are given. The diol employed is preferably a mixture of a low molecular weight glycol with a polyglycol of molecular weight 400-10,000. The bifunctional acid may be a dicarboxylic acid, a hydroxy acid or an amino-acid. The cross-linking agent may contain hydroxy, carboxy, amino or mercaptan groups as groups reactive with the isocyanate radical. Fourteen examples are given of intermediate polymers using a bifunctional acid in the formulation and eleven of intermediate polymers using polyester resins. Time and temperature charts are given for the production of the two types of product (including the introduction of the cross-linking agent). The products may be compounded with the usual additives such as solvents (ketones, esters, ethers and halogenated hydrocarbons), fillers and pigments (talc, mica, asbestos, rayon flock, graphite, carbon black, iron oxide, chromates, silica, chromium powder, organic pigments), plasticisers (dioctyl phthalate, polyglycol diesters, dibutyl sebacate, tricresylphosphate, esteramides, silicones, di-2-ethyl hexyl adipate, chlorinated diphenyl). The polysulphide resins which may be used in admixture with the diisocyanate polymers have molecular weights from 500-4000 and a low degree of cross-linking. The catalyst mixture for the compositions containing a polysulphide resin preferably include an amine (including hydrazine) for the diisocyanate polymer and a peroxide for the polysulphide. The polysulphide catalyst may be zinc, cadmium or mercury oxide. Accelerators such as other amines, metal soaps, metal dimers or quinone dioxime may be included. Sixteen examples of compositions containing polysulphide resins are given with the polysulphide comprising up to about 85 per cent by weight of the composition. Uses.-As films formed by the usual techniques; as coatings and impregnants applied by the usual techniques to metal, wood, cloth, glass, paper or plastics, e.g. acrylic or styrene plastics; in combination with polysulphide resins as sealing and caulking materials, gaskets for oil and grease and as window glazing material.

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