Plastic and nonmetallic article shaping or treating: processes – Miscellaneous
Reexamination Certificate
2006-07-04
2006-07-04
Egwim, Kelechi C. (Department: 1713)
Plastic and nonmetallic article shaping or treating: processes
Miscellaneous
C524S557000
Reexamination Certificate
active
07070731
ABSTRACT:
The present invention provides a new dispersion stabilizer that satisfies, at a high level, the performances required for a dispersion stabilizer used for suspension polymerization. A method of producing a dispersion stabilizer that is useable for suspension polymerization of a vinyl compound and contains a vinyl alcohol polymer (A) includes producing the vinyl alcohol polymer (A) by heat-treating a vinyl alcohol polymer (B) at a temperature of 90 to 180° C. for 0.5 to 20 hours in an atmosphere in which an oxygen concentration is 8000 ppm or lower. The vinyl alcohol polymer (B) has a saponification degree of at least 60 mol % and contains a residual acetic acid group whose block character is in the range of 0.3 to 0.6.
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Katayama Masako
Kato Masaki
Nakano Yoko
Sho, legal representative Yoshiko
Sho, legal representative Yukiko
Egwim Kelechi C.
Kuraray Co. Ltd.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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