| 摘要 |
<p>1,160,476. Foamed unsaturated polyesters. FARBENFABRIKEN BAYER A.G. 21 July, 1967 [21 July, 1966], No. 33664/67. Headings C3C and C3P. Foamed materials are prepared by foaming a copolymerizable mixture comprising an unsaturated polyester which is a polycondensation product of an ethylene 1,2-dicarboxylic acid or an anhydride thereof and a polyhydric alcohol, and a monomeric polymerizable vinyl, vinylidene or allyl compound, by adding to the copolymerizable mixture (a) a polymerization catalyst system comprising an organic peroxide as catalyst and an accelerator adapted to reduce the temperature of the activity of the catalyst to ambient temperature, (b) a carbonic acid ester anhydride which decomposes with splitting off of carbon dioxide; and (c) a compound of a di- or polyvalent metal of the second or fourth main or auxiliary groups or of the third, fifth, sixth or seventh auxiliary groups or the Periodic System, including the rare earths and the metals copper, iron and cobalt, in amounts of 0À01 to 50% by weight referred to the amount of carbonic acid ester anhydride present, the metal compound being soluble in the copolymerizable mixture and reducing the decomposition temperature of the carbonic-acid ester anhydride of (b) to ambient temperature. The term " carbonic acid ester anhydride " means an anhydride of a monoester of carbonic acid, and includes anhydrides of carbonic acid monoesters with each other as well as mixed anhydrides formed from one or more molecules of a carbonic acid monoester and one or more molecules of another acid. The specified groups of the Periodic System consist of the following elements: Be, Mg, Ca, Sr, Ba, Ra, Ge, Sn, Pb, Zn, Cd, Hg, Ti, Zr, Hf, Sc, Y, La, Ac, V, Nb, Ta, Cr, Mo, W, Mn, Tc and Re. In examples are used: polyesters prepared from maleic anhydride, phthalic anhydride, 1,3-butane-diol, diglycol, castor oil, reaction product of toluylene - 2,4 diisocyanate, and toluylene - 2,6- diisocyanate with trimethylolpropane; styrene; hydroquinone, toluhydroquinone; polysiloxanehydroxyalkylene copolymer, sodium salt of sulphonated castor oil in distilled water; benzoyl peroxide, cyclohexanone peroxide; dimethyl-p-toluidine, dimethyl aniline; dimethyl formamide; expanded clay and many carbonic acid ester anhydrides (b) and metal compounds (c).</p> |
