公开(公告)号：JPS62265383A

公开(公告)日：1987-11-18

申请号：JP10768086

申请日：1986-05-13

Applicant: BRIDGESTONE CORP

Inventor： HASEGAWA HAJIME ,  KATO MASAMI

IPC: C08J9/02 ,  C08G18/00 ,  C08J9/12 ,  C09K3/10

Abstract: PURPOSE:To obtain a polyurethane foam sealant which is of open-cell type and has excellent waterproofness, by adding a hydrophobic hydrocarbon resin to a specified polyhydroxyl compound and a polyisocyanate compound. CONSTITUTION:A polyurethane foam which contains as its principal constituents a polyhydroxyl compound mentioned below and a polyisocyanate compound and is obtained by adding a hydrophobic hydrocarbon resin thereto. As the polyhydroxyl compound, a mixture of a high-molecular weight polyether polyol having a hydroxyl number of 100 or less with a low-molecular weight polyhydroxyl compound having a hydroxyl number of 560 or more and 2-4 hydroxyl groups in a molecule is used. Examples of hydrophobic resins to be used include: petroleum oils, such as paraffin, wax, asphalt, and a petroleum resin obtained by polymerizing the 4-9C fraction, the by-product from naphtha cracking; animal oils; and vegetable oils.