| 摘要 |
<p>1468479 Diels-Alder reaction products UCB 27 Aug 1975 [29 Aug 1974] 35341/75 Headings C2C and C2P [Also in Division C3] The invention comprises Diels-Alder reaction products of (A) at least one dienophile of the formula wherein Z is H, Cl, Cn, CH 3 , phenyl or COOR, where R is H, alkyl, cycloalkyl, aryl, haloalkyl, halocycloalkyl, haloaryl or Y is the radical of a polyol of MW less than 3000 and containing 2 to 6 OH groups, at least two of which are esterified, the polyol optionally containing N, Si or P, n is 1 to 5 and x is 0 or 1 to 4; and (B) at least one linear or cyclic diene of the formula wherein W and X are saturated aliphatic hydrocarbon radicals, or aliphatic hydrocarbon radicals containing at least one double bond, or hydroxyl or carbonyl groups; either of W or X containing a carboxyl group; or W and X together with the -CH=CH-CH=CH- chain form a ring, said ring being optionally substituted with alkyl or cycloalkyl radicals or a carboxyl group. They may be obtained by heating mixtures of the above specified dienes and dienophiles at 80‹ to 140‹ C. for 1 to 20 hours. The reaction may be carried out in the absence of solvents when the reactants are liquid at ambient temperature. However, when the reactants are not liquid at ambient temperature the reaction may be carried out in the presence of solvents which may be removed after the reaction is complete. A Lewis acid may be present as a catalyst and radical polymerization inhibitors may also be present. The dienophile may be modified by pretreatment with either fumaric acid or maleic anhydride. In the latter case, the maleate is partially or totally converted into the fumarate. Also, auxiliary dienophiles may be added during the reaction, preferably towards the end thereof. Remaining free COOH groups of the reaction products may be esterified with hydroxy or epoxy compounds, and remaining free OH groups may be esterified or transesterified with organic acids, anhydrides, esters or acid chlorides, or reacted with a mono- or polyisocyanate or with a dialkyl sulphate. The reaction products are radiocurable and may be incorporated into sealers, adhesives, paints, varnishes and inks which may then be cured.</p> |
