| 摘要 |
<p>The prod. (A) of a graft reaction between (1) an unsatd. polyoxyalkylene adduct of formula (I) and (2) at least one ester of formula (II) in the presence of free-radical initiator. Component (II) includes enough fumarate diester to cause grafting of more than 75% of (II) to (I). - H(-polyoxyalkylene chain)t-R (I) T1-O-CO(-CuH2u-2)-CO-O-T2 (II) In the formulae R = unsatd. organic radical; t = a number (pref. 1-8); u = 2 or 3; T1 and R2 = opt. unsatd., straight or branched hydrocarbyl. - A foam prod. made by reacting (1) polyurethane or polyisocyanurate polymer-forming reactants; (2) blowing agent and (3) as surfactant, produce (A). When (1) is a polyisocyanurate precursor, (I) is end-capped to reduce the hydroxy no. below 50. - Pref. in (I) the cpds. have mol. wt. over 1000, esp. it is derived from one or more of ethylene, propylene and butylene oxides. Partic., ethoxylated castor oil is used. In (II), T1 and T2 = 8-18C (un)satd. hydrocarbyl, esp. dioleyl, dioctyl or (best)ditridecyl fumarates, esp. making up 95-100% of component (II). - Pref. (II) is 5-40 (10-30) wt.% of the reaction mixt. with the initiator 1-30 (1-25) wt.%. Opt. a metal catalyst is included at 0.001-0.06 g/g initiator. Suitable reagents for end-capping are carboxylic acids, or their reactive derivs..</p> |
