公开(公告)号：US06803458B2

公开(公告)日：2004-10-12

申请号：US10239628

申请日：2002-09-20

申请人： Toru Ozaki ,  Hirofumi Sasai ,  Hiroki Taniguchi ,  Michiyo Nakai ,  Shinsuke Suzuki

发明人： Toru Ozaki ,  Hirofumi Sasai ,  Hiroki Taniguchi ,  Michiyo Nakai ,  Shinsuke Suzuki

IPC分类号： C08B306

CPC分类号： C08B3/06

摘要： The present invention provides a cellulose acetate satisfying at least one requirement selected from the following requirements (A), (B) and (C), provided that the case where (B) alone is satisfied is excluded. Requirement (A): Bright spotty matters in sizes of 20 &mgr;m or more are not more than 20 units/mm3. Requirement (B): Blocking constant (K) is not more than 60. Requirement (C): The ratio (G′/G″) of storage modulus (G′) to loss modulus (G″) at a measuring frequency of 0.016 Hz is not more than 0.2.

摘要翻译： 本发明提供满足以下要求（A），（B）和（C）中至少一个要求的乙酸纤维素乙酸酯，只要满足（B）的情况即被排除。要求（A）：亮点 尺寸为20um或更大的物质不超过20单位/ mm 3。要求（B）：阻塞常数（K）不大于60.要求（C）：比例（G'/ G“ 在0.016Hz的测量频率下的储能模量（G'）与损耗模量（G“）不大于0.2。

公开(公告)号：US06683174B1

公开(公告)日：2004-01-27

申请号：US09831454

申请日：2001-05-08

申请人： Toru Ozaki ,  Hiroshi Ogawa ,  Hirofumi Sasai

发明人： Toru Ozaki ,  Hiroshi Ogawa ,  Hirofumi Sasai

IPC分类号： C08B306

CPC分类号： C08B3/06

摘要： The present invention provides a cellulose triacetate which exhibits a satisfactory filtration performance Thus, the present invention provides a cellulose triacetate whose occlusion constant (K) determined by the following method is 70 or less. Method: the cellulose triacetate is dissolved in a solvent mixture of methylene chloride/methanol (9/1 w/w) to form a 16% by weight (as a solid concentration) solution, which is then filtered under a constant pressure at the filtration pressure of 3 kg/cm2 and the temperature of 25° C. using a muslin filter to determine a filtered volume with the lapse of time, from which the slope of a linear curve represented by t/V−t (wherein t is a filtration time (sec) and V is a filtered volume (ml)) is calculated to obtain an occlusion constant (K) where K=slope×2×104.

摘要翻译： 本发明提供一种显示出令人满意的过滤性能的三醋酸纤维素。因此，本发明提供一种三乙酸纤维素，其通过以下方法确定的遮蔽常数（K）为70以下。 方法：将三乙酸纤维素溶解在二氯甲烷/甲醇（9/1w / w）的溶剂混合物中以形成16重量％（作为固体浓度）溶液，然后在恒定压力下过滤 压力为3kg / cm 2，温度为25℃，用棉布过滤器确定过滤体积随时间的推移，由t / Vt表示的线性曲线的斜率（其中t为 计算过滤时间（秒），V为过滤体积（ml）），得到K = slopeex2×10 4的遮蔽常数（K）。