The present invention addresses the problem of providing a block copolymer which is useful as a surface treatment agent for cell culture substrates, said surface treatment agent enabling cell separation in a short period of time. The above-mentioned problem is solved by a block copolymer that comprises the following blocks (A), (B) and (C). (A) a temperature-responsive polymer block that has a lower critical solution temperature (LCST) within the range of from 0°C to 50°C with respect to water (B) a hydrophilic polymer block that does not have an LCST within the range of from 0°C to 50°C, while having an HLB value (as determined by a Griffin method) within the range of from 9 (inclusive) to 20 (exclusive) (C) a hydrophobic polymer block that does not have an LCST within the range of from 0°C to 50°C, while having an HLB value (as determined by a Griffin method) within the range of from 0 (inclusive) to 9 (exclusive)
                            本发明要解决的问题是提供一种嵌段共聚物,它可用作
细胞培养基质的表面处理剂,所述表面处理剂可在短时间内实现细胞分离。解决上述问题的是一种嵌段共聚物,它由以下嵌段(A)、(B)和(C)组成。(A) 具有温度响应性的聚合物嵌段,其相对于
水的较低临界溶液温度(LCST)在 0°C 至 50°C 范围内 (B) 亲
水性聚合物嵌段,其相对于
水的较低临界溶液温度(LCST)不在 0°C 至 50°C 范围内、(C) 疏
水性聚合物嵌段,其低临界溶液温度(LCST)不在 0℃至 50℃之 间,同时其 HLB 值(由格里芬方法确定)在 0(含)至 9(不含)之 间。