A process for synthesis of a polymeric polyalcohol substantially and preferably built up form polyester units and composed of a monomeric or polymeric initiator molecule to which at least one dentritic branch (dendron) consisting of a number of branching generations is added. The branching generations comprise a polymericor monomeric branching chain extender having three reactive functions of which two are hydroxyl groups. The two hydroxyl groups of the ranching chain extender is acetal protected by reaction between said two hydroxyl groups and an acetal-forming carbonyl compound, preferably an aldehyde. The acetal protected branching chain extender is then employed for addition to the initiator molecule of a first branching generation followed by an optional deprotection of the hydroxyl groups by decomposition of acetals and for addition in repeated steps of further branching generations. Additions of branching generations individually employ an acetal protected branching chain extender synthesized from the same or a different branching chain extender and/or acetal-forming carbonyl compound and addition of a branching generation is optionally followed by addition of a spacing generation.
一种合成聚醇的方法,该聚醇基本上由聚酯单元构成,且优选地由单体或聚合物引发分子组成,其中至少添加了一个包含多个分支代数的树状支链(树状体)。这些分支代数包括具有三个反应功能的聚合物或单体分支链扩展剂,其中两个是羟基基团。分支链扩展剂的两个羟基基团通过与
缩醛化合物(优选为醛)反应而被乙缩保护。然后,乙缩保护的分支链扩展剂被用于添加到第一分支代的引发分子中,随后是通过分解
缩醛去保护羟基基团的可选步骤,并通过进一步的分支代数重复添加步骤来添加。单独添加分支代数的添加使用从相同或不同的分支链扩展剂和/或
缩醛形成化合物合成的乙缩保护的分支链扩展剂,并且分支代的添加可选地后跟间隔代的添加。