This company is referenced (as an agent) on the website of the MINOSHOJI company. Pages in english and japanese provided in refs. The second kanji is most probably miswritten or simply not well readable and therefore has been confused with the one for "KAWA" (river), instead is the one for "SHUU" which doesn't have the KUN pronounciation, they both must be read ON (so NAN- not Minami !).
Bye

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Note added at 3 hrs (2006-05-24 12:45:12 GMT)
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Full address :-)

株式会社 南州化成 宮崎県 都城市 平江町19-6
TEL(0986)25-1918
FAX(0986)25-7468

NANSHUU KASEI CO., LTD. 19-6 Hiraecho Miyakonojyo, Miyazaki
TEL81-986-25-1918
FAX81-986-25-7468

您现在的位置： 首页 > 世界买家 > NANKAWA KASEI CO LTD. NANKAWA KASEI CO LTD. 国家(地区)：, 日本. 雇员人数：, 5人. 成立时间：, 1948. 年进口额：, USD 1789000 ...
data.mofcom.gov.cn/pls/wdat/ b_query.b_detail_company?p_corpid=641751 - 4k

The company itself doesn't seem to have an English Website.

http://www.google.com/search?q="南川化成"

The formuala for translation the part after "Minakawa" is "Kasei Co. Ltd." (With some variations -- Some do without "Kasei", and some attach "Kaisei" to the name which goes before it).

Here're some examples to illustrate -- the copyrights statements appear at the lower right corner of the Websties.

Hope this helps.

FYI:

http://www.aronkasei.co.jp/
Copyright 2003 ARONKASEI CO.,LTD.

http://www.fkkasei.co.jp/
COPYRIGHT 2006 FUJIKURAKASEI CO.,LTD. ALL RIGHTS RESERVED.

http://www.nihonkasei.co.jp/
Nihon Kasei Co., Ltd.

http://www.nkchemical.co.jp/ver_03/japanese/index_j.html
Nippon Kasei Co., Ltd.

More of such:
http://www.google.com/search?hl=en&q="化成（株）"&lr=lang_ja

Minikawa:
日本全国地域情報 Town Information in Japan - {Minakawa, 南川, 皆川 ... - [ Translate this page ]{Minakawa, 南川, 皆川, Minagawa}. [ Index | English | Editor's Note ] ... Reference(similarity) / mina // naka // 伊南川 // 川 // 南 / ... 滋賀県立大学、 工学部、機械システム工学科、連続体力学研究分野の南川講師のホームページ。 ...
www.towninfo.jp/c/urls/word/m/i/nakawa-jp.html - 24k - Supplemental Result - Cached - Similar pages

http://www.google.com/search?hl=en&lr=&q=Minakawa, 南川

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Note added at 4 hrs (2006-05-24 14:07:38 GMT)
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correction: Minakawa