Title:
ジフェニルメタン系ポリイソシアネートの製造法
Document Type and Number:
Japanese Patent JP4938007
Kind Code:
B2
Abstract:
Process for preparing mixtures comprising diphenylmethane diisocyantes and polyphenylpolymethylene polyisocyanates having a higher HunterLab color (L) number by staged reaction of the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one solvent whereby in a first stage the corresponding carbamoyl chlorides and amine hydrochlorides are formed and whereby in a subsequent stage the residual carbamoyl chlorides are dissociated into the corresponding polyisocyanates and hydrogen chloride and amine hydrochlorides are phosgenated to form ultimately the corresponding polyisocyanates in which some amine hydrochlorides remain unreacted at the point where residual excess phosgene is removed from the reaction mixture.
Inventors:
Smith, richard sea
Kerr, Robert H
Kerr, Robert H
Application Number:
JP2008514695A
Publication Date:
May 23, 2012
Filing Date:
May 23, 2006
Export Citation:
Assignee:
Huntsman International LLC
International Classes:
C07C263/10; C07C265/14
Domestic Patent References:
| JP2003522725A | ||||
| JP59141553A | ||||
| JP9100263A | ||||
| JP2003503383A |
Other References:
社団法人 日本化学会編,化学工学便覧,2001年 4月25日,改訂六版,233-243頁
Attorney, Agent or Firm:
Shinjiro Ono
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Mitsutoshi Nakamura
Yasushi Kobayashi
Akio Chiba
Hiroyuki Tomita
Mitsutoshi Nakamura