A graft copolymer is provided that is useful as an adhesive composition that is excellent in adhesion strength between polyolefins and between a polyolefin and another member (for example, a metal, a resin, and an inorganic material, such as glass), is excellent in flowabilityat a low temperature and in melting property in a low temperature range, and is excellent in heat resistance after adhesion, i.e., a graft copolymer satisfying the following items (a) to (e):
the graft copolymer having;
(a) a main chain that is derived from one kind or two or more kinds of monomers selected from (I) acrylic acid and a derivative thereof, (II) methacrylic acid and a derivative thereof, (III) a vinyl ester and a derivative thereof, (IV) styrene and a derivative thereof and (V) a vinyl group-containing silane compound, at least one kind of the a monomer having a crosslinkable functional group,
(b) a side chain that is derived from a reactive polyolefin having a meso pentad fraction (mmmm) of from 30 to 80% by mol and having an end unsaturated group in an amount of from 0.5 to 1.0 group per one molecule, the reactive polyolefin being a homopolymer of one kind of an α-olefin having from 3 to 28 carbon atoms, a copolymer of two or more kinds of α-olefins having from 3 to 28 carbon atoms, or a copolymer of 50% by mass or more of at least one of an α-olefin having from 3 to 28 carbon atoms and 50% by mass or less of ethylene,
(c) a graft ratio of from 1 to 150% by mass,
(d) a weight average molecular weight of from 500 to 400,000 measured by GPC, and
(e) a molecular weight distribution (Mw/Mn) of from 1.5 to 4.
本发明提供了一种接枝共聚物,可用作聚烯烃之间以及聚烯烃与另一构件(例如
金属、
树脂和无机材料,如
玻璃)之间粘合强度优异、低温流动性和低温范围内熔融性优异、粘合后耐热性优异的粘合剂组合物,即满足以下(a)至(e)项的接枝共聚物:
接枝共聚物具有
(a) 由一种或两种以上单体衍生的主链,这些单体选自 (I)
丙烯酸及其衍
生物,(II)
甲基丙烯酸及其衍
生物,(III)
乙烯基酯及其衍
生物,(IV)
苯乙烯及其衍
生物和 (V) 含
乙烯基的
硅烷化合物,其中至少一种单体具有可交联的官能团、
(b) 源自反应性聚烯烃的侧链,该反应性聚烯烃的中五分数(mmm)为 30%至 80%(摩尔),且具有末端不饱和基团的量为 0.5 至 1.(b) 反应性聚烯烃是一种具有 3 至 28 个碳原子的α-烯烃的均聚物、两种或两种以上具有 3 至 28 个碳原子的α-烯烃的共聚物,或至少一种具有 3 至 28 个碳原子的α-烯烃与 50% 或更少质量的
乙烯的共聚物、
(c) 接枝率为 1%至 150%(以质量计)、
(d) 经
GPC 测定的重量平均分子量为 500 至 400,000,以及
(e) 分子量分布(Mw/Mn)为 1.5 至 4。