JP2000072882A5

JP2000072882A5 -

Info

Publication number: JP2000072882A5
Application number: JP1998243711A
Authority: JP
Filing date: 1998-08-28
Publication date: 2005-05-12

Description

【００１０】
【課題を解決するための手段】
本発明は、重合体中のゴム含量が５０重量％〜８５重量％であるジエン系グラフト重合体ラテックスであって、このジエン系グラフト重合体１００重量部に対してヒンダードフェノール系安定剤０．１〜２重量部、およびチオエーテル系安定剤０．３〜６重量部を含むラテックスを噴霧乾燥して粉体化するに際して、噴霧乾燥に用いる噴霧乾燥機の連続運転時間が、式（１）で求められるｔ（時間）を超えないことを特徴とする粉末状ジエン系グラフト重合体の製造方法に関する。
ｔ＝７．８×１０ ^−２０ ×ｅｘｐ｛２１５４０／（２７３＋Ｔ−２０）｝×Ｐ×Ｓ
・・・（式１）
（ここで、ｔ：連続運転可能時間（時間）、Ｔ：噴霧乾燥機熱風入口温度（℃）、Ｐ：ヒンダードフェノール系安定剤量（重量部）、但し０．１≦Ｐ≦２、Ｓ：
チオエーテル系安定剤量（重量部）、但し０．３≦Ｓ≦６である。） [0010]
[Means for Solving the Problems]
The present invention provides a diene-based graft polymer latex having a rubber content of 50% by weight to 85% by weight in the polymer, wherein 100 parts by weight of the diene-based graft polymer is hindered phenol stabilizer 0. When spray drying a powder containing 1 to 2 parts by weight and 0.3 to 6 parts by weight of a thioether stabilizer, the continuous operation time of the spray dryer used for spray drying is represented by Formula (1) The present invention relates to a process for producing a powdery diene-based graft polymer characterized by not exceeding the required t (hour).
t = 7.8 × 10 ⁻²⁰ × exp {21540 / (273 + T−20)} × P × S
... (Equation 1)
(Where, t: continuous operation possible time (hour), T: spray dryer hot air inlet temperature (° C.), P: amount of hindered phenolic stabilizer (parts by weight), provided that 0.1 ≦ P ≦ 2, S :
The amount (parts by weight) of thioether stabilizer, provided that 0.3 ≦ S ≦ 6. )

本発明における噴霧乾燥は、ラテックスを微小粒滴状に噴霧し、これに熱風を当てて乾燥するものであり、その際噴霧乾燥機の連続運転時間を、式（１）で求められるｔ（時間）を超えない範囲で連続運転する。
ｔ＝７．８×１０^−２０×ｅｘｐ｛２１５４０／（２７３＋Ｔ−２０）｝×Ｐ×Ｓ
・・・（式１）
ここで、ｔは連続運転可能時間（時間）、Ｔは噴霧乾燥機熱風入口温度（℃）、Ｐはヒンダードフェノール系安定剤量（重量部；ジエン系グラフト重合体１００重量部に対して）、Ｓはチオエーテル系安定剤量（重量部；ジエン系グラフト重合体１００重量部に対して）を表す。尚、Ｐ、Ｓは、それぞれ０．１≦Ｐ≦２、０．３≦Ｓ≦６の範囲である。 The spray drying in the present invention is to spray the latex in the form of fine particles and to apply hot air to the latex for drying, in which case the continuous operation time of the spray dryer can be determined by the equation (1). ) for continuous operation in a range that does not exceed.
t = 7.8 × 10 ⁻²⁰ × exp {21540 / (273 + T−20)} × P × S
... (Equation 1)
Here, t is a continuous operation time (hour), T is a spray dryer hot air inlet temperature (° C.), and P is a hindered phenol stabilizer amount (part by weight; based on 100 parts by weight of a diene graft polymer) And S represent the amount of thioether-based stabilizer (part by weight; based on 100 parts by weight of diene-based graft polymer). P and S are in the ranges of 0.1 ≦ P ≦ 2 and 0.3 ≦ S ≦ 6, respectively.

Claims

A diene based graft polymer latex having a rubber content of 50% by weight to 85% by weight in the polymer, wherein 0.1 to 2 parts by weight of a hindered phenol based stabilizer is contained with respect to 100 parts by weight of the diene based graft polymer In spray-drying and pulverizing a latex containing 0.3 parts by weight of thioether stabilizer and 0.3 to 6 parts by weight of a thioether-based stabilizer, the continuous running time of the spray dryer used for spray drying can be obtained by the formula (1). A method for producing a powdery diene-based graft polymer characterized in that the time does not exceed
t = 7.8 × 10 ⁻²⁰ × exp {21540 / (273 + T−20)} × P × S
... (Equation 1)
(Where, t: continuous operation possible time (hour), T: spray dryer hot air inlet temperature (° C.), P: amount of hindered phenolic stabilizer (parts by weight), provided that 0.1 ≦ P ≦ 2, S :
The amount (parts by weight) of thioether stabilizer, provided that 0.3 ≦ S ≦ 6. )

The method for producing a powdery diene-based graft polymer according to claim 1, wherein a hot air inlet temperature of a spray dryer used for spray drying is 200 ° C or less.

After the spray dryer used for spray drying in which the t (time) time continuous operation does not exceed, washed dryer inside prior to the next sequential operation, claim, characterized in that the removal of retentate 1 or 2 The manufacturing method of the diene-type graft polymer as described in 4.

4. The diene-based graft polymer according to any one of claims 1 to 3 , further comprising an inorganic filler or a hard resin added to the diene-based graft polymer latex to be spray-dried, followed by spray-drying. Production method.