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Title:
METHOD FOR REMOVING HYDROCARBON SOLVENT FROM SOLUTION OF HYDROGENATED BLOCK COPOLYMER IN HYDROCARBON SOLVENT
Document Type and Number:
WIPO Patent Application WO/2001/030859
Kind Code:
A1
Abstract:
A method for removing a solvent from a hydrocarbon solvent solution of a hydrogenated block copolymer (a hydrogenation degree for double bonds of conjugated diene monomer units: 30 % or more) obtained by hydrogenating a block copolymer comprising a polymer block containing a vinyl aromatic monomer unit as a main component and a polymer block containing a conjugated diene monomer unit as another main component (vinyl aromatic monomer unit/ conjugated diene monomer unit, in weight ratio: 5/95 to 95/5), characterized as comprising (1) admixing the hydrocarbon solvent solution of a hydrogenated block copolymer with hot water to produce a dispersion comprising the solution dispersed in the hot water, and (2) introducing the dispersion to a steam stripping vessel by spraying the dispersion toward the surface of the hot water under a condition wherein the vapor pressure P¿1? of the dispersion and the pressure P¿2? of the gas phase satisfy the relationship: P¿1? $m(G) P¿2 ?, to remove the solvent through steam stripping, thereby preparing a porous crumb.

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Inventors:
HAKAMAYA ATSUO (JP)
YAMAKOSHI YASUMASA (JP)
KAMAYA MASAMI (JP)
Application Number:
PCT/JP2000/007607
Publication Date:
May 03, 2001
Filing Date:
October 27, 2000
Export Citation:
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Assignee:
ASAHI CHEMICAL IND (JP)
HAKAMAYA ATSUO (JP)
YAMAKOSHI YASUMASA (JP)
KAMAYA MASAMI (JP)
International Classes:
C08F6/12; C08F8/04; C08F297/04; C08L53/02; (IPC1-7): C08F6/12; C08F297/04; C08F8/04
Foreign References:
US5616652A1997-04-01
JPH02185503A1990-07-19
JPH02182703A1990-07-17
EP0992520A12000-04-12
Other References:
See also references of EP 1153939A4
Attorney, Agent or Firm:
Yoshioka, Masashi (Akasaka Habitation Building 3-5 Akasaka 1-chome Minato-ku, Tokyo, JP)
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