[EN] MATERIALS AND OLIGOMERS IN LOW VOC COATINGS<br/>[FR] SUBSTANCES ET OLIGOMÈRES DANS DES REVÊTEMENTS À FAIBLE TENEUR EN COV
申请人:BASF CORP
公开号:WO2009025703A1
公开(公告)日:2009-02-26
A coating composition comprises a thermosetting binder, comprising a crosslinker, a first, hard material having functionality reactive with the crosslinker, and a second, soft material having functionality reactive with the crosslinker. The first, hard material is a polymer, oligomer or compound, the first material having a glass transition temperature of at least 40 C, a number average molecular weight of 2000 or less, and an equivalent weight of 150 to 600 grams per equivalent of functionality reactive with the crosslinker. The second, soft material is a compound that is an amorphous mixture of four or more isomers, near isomers, and/or homologous structures and has from two to four functional groups that form thermally irreversible linkages with the crosslinker under cure conditions, wherein each functional group is separated from each other functional group by at least four atoms. The first, hard material may also have an equivalent weight of about 220 to about 850 grams per equivalent of functionality reactive with the crosslinker or with at least one of the plurality of crosslinkers under cure conditions and be a material, which, if reacted alone with the crosslinker or with the at least one of the plurality of crosslinkers, would form a film having a Tukon hardness of 16 or more, the second, soft material may also have an equivalent weight of 200 to 2000 grams per equivalent of functionality reactive with the crosslinker or with at least one of the plurality of crosslinkers under cure conditions and be a material, which, if reacted alone with the crosslinker or with the at least one of the plurality of crosslinkers, would form a film having a Tukon hardness of less than 4, while the coating composition forms a cured film havingn a Tukon hardness of from about 7 to about 12.
涂料组合物包含一种热固性粘合剂,该粘合剂包含交联剂、第一种硬材料和第二种软材料。第一种硬材料具有与交联剂反应的功能性,第二种软材料也具有与交联剂反应的功能性。
第一种硬材料是由聚合物、低聚物或化合物构成的,其玻璃转变温度至少为40°C,数均分子量不超过2000,并且基于与交联剂反应的功能性,其等效重量介于150至600克每等效之间。第二种软材料是一种化合物,它是四个或更多异构体、近似异构体和/或同系物的无定形混合物,并且具有两个至四个可形成热不可逆交联键的功能性基团,在固化条件下,每个功能性基团之间至少间隔四个原子。
第一种硬材料的等效重量也可能在约220至约850克每等效之间,且当其单独与交联剂反应时,会形成具有Tukon硬度不小于16的薄膜。第二种软材料的等效重量也可能在200至2000克每等效之间,且当其单独与交联剂反应时,会形成具有Tukon硬度小于4的薄膜。而涂料组合物则形成固化后具有Tukon硬度约7至约12的薄膜。