| 摘要 |
1,147,941. Acid-modified polyurethane foams. STANDARD OIL CO. 14 April, 1966 [15 April, 1965], No. 16409/66. Addition to 1,137,263. Heading C3R. The foam of Specification 1,137,263 is modified by addition of water in the preparation to produce a flame retardant foam, by reaction in the presence of water of (I) a polyarylisocyanate comprising at least two benzene nuclei with at least one isocyanato group on each nucleus, (II) an aromatic carboxylic compound having at least two groups selected from carboxyl and carboxylic anhydride groups attached to one or more benzene nuclei, and (III) a polyol having a molecular weight not exceeding 2000 and having at least three hydroxy groups per molecule. Preferred proportions are: water, 0À1-10 wt. per cent of the reactants, polyol, 1-75 wt. per cent of (I) plus (II); and carboxyl plus anhydride groups, 0À5-1À5 per NCO group. Suitable reactants are listed. In the examples polymethylenepolyphenyl polyisocyanate is mixed with trimellitic anhydride, and to this is added a polyoxypropylenated pentaerythritol, sucrose, ethylene diamine, alpha-methyl glycoside, or sorbitol or a phosphate-containing polyether, and water, a silicone oil and optionally CCl 3 F. The trimellitic anhydride may also contain some terephthalic acid, pyromellitic dianhydride, trimesic acid or pyromellitic acid. |
