Gun Ei Chemical Industry Co., Ltd.

Kurita Water Industries Ltd.

Michiyasu Yamazaki

Satoshi Wada

Yukio Abe

Chigusa Taguchi

Yuta Arimoto

Takeshi Tsuihiji

Yuko Okusa

Katsumi Matsumoto

Provided are a pitch-formation suppressor and the like which can be widely applied independently of the substance that causes a pitch and of the situation to generate a pitch in a paper manufacturing process, and which can effectively suppress and prevent the troubles due to the pitch, such as foreign spots and defects in a paper, breakage of a paper, and lowering of workability. This pitch-formation suppressor comprises an alkaline solution in which a phenol resin and/or a modified phenol resin is dissolved, or an acid solution in which a phenol resin and/or a modified phenol resin is dissolved.

Method for suppressing pitch formation

An object of the present invention is to provide a material which resolves the drawbacks associated with polyimide polymers, and yet retains the advantages offered by conventional polyimide polymers. An amino group containing phenol derivative of the present invention is represented by a general formula (1) show below, and the present invention also provides a polyimide precursor produced using such an amino group containing phenol derivative.(wherein, R, Rand R, which may be the same or different, each represent an alkyl group of 1 to 9 carbon atoms, an alkoxy group of 1 to 10 carbon atoms, a COOR group (in which R represents an alkyl group of 1 to 6 carbon atoms) or a hydrogen atom; Rand R, which may be the same or different, each represent an alkyl group of 1 to 9 carbon atoms or a hydrogen atom; X represents &#x2014;O&#x2014;, &#x2014;S&#x2014;, &#x2014;SO&#x2014;, &#x2014;C(CH)&#x2014;, &#x2014;CH&#x2014;, &#x2014;C(CH)(CH)&#x2014;, or &#x2014;C(CF)&#x2014;; and n represents an integer of 1 or greater).

Amino group containing phenol derivative

Amino group containing phenol

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Takasaki, Japan

Michiyasu Yamazaki