Title:
PROCESS FOR PRODUCING RIGID POLYURETHANE SLAB FOAM, RIGID POLYURETHANE SLAB FOAM, AND HEAT-INSULATING MATERIAL FOR PIPING
Document Type and Number:
WIPO Patent Application WO/2008/035458
Kind Code:
A1
Abstract:
[PROBLEMS] To provide a process for producing a rigid polyurethane slab foam which
does not scorch inside, has a low thermal conductivity, retains excellent flame
retardancy over long, and has excellent dimensional stability. [MEANS FOR SOLVING
PROBLEMS] A foam-forming composition comprising [A] a modified polyisocyanate
which is obtained by modifying at least part of a polymeric MDI having an MDI content
of 30-80 mass% with a modifier comprising a polyester polyol having a hydroxy
value of 150-300 mg-KOH/g and which has an NCO content of 24.0-28.0%, [B] a polyol
ingredient comprising at least 50 mass% at least one member selected among (B1)
a polyether polyol made with toluenediamine as an initiator, (B2) a polyether
polyol made with sorbitol as an initiator, and (B3) a polyether polyol made with
sucrose as an initiator, and [C] a blowing agent comprising water is reacted to
cause it to freely foam, with the top kept open.
Inventors:
INOHARA HIDEKI (JP)
Application Number:
PCT/JP2007/000998
Publication Date:
March 27, 2008
Filing Date:
September 13, 2007
Export Citation:
Assignee:
NIPPON POLYURETHANE KOGYO KK (JP)
INOHARA HIDEKI (JP)
INOHARA HIDEKI (JP)
International Classes:
C08G18/10; C08G101/00
Domestic Patent References:
| WO1998029958A1 | 1998-07-09 |
Foreign References:
| JP2001002749A | 2001-01-09 |
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