| 摘要 |
1295829 Aromatic amine-modified aldehyde condensation polymers WEYERHAEUSER CO 29 April 1970 [5 May 1969] 20629/70 Heading C3R An amine-modified condensation polymer is obtained by reaction of an aldehyde condensation polymer with a primary aromatic amine of the formula wherein X 1 is -NH 2 or -CH 2 NH 2 , X 2 is as X 1 or is -OH or -OCH 3 , X 3 is H or as X 2 or is -COOH, -NO 2 , -CH 3 , -NHCOCH 3 , or -A-C 6 H 5 , X4 is H or a C 1-4 alkyl radical, and A is -(CY 1 Y 2 ) z -, -SO 2 -, -NH-, -O-, -S-, -CH=CH- or -S-S-, where Y 1 and Y 2 are each H or a C 1-3 alkyl radical and x is 0, 1 or 2, the product being curable by reaction with a compound that gives rise to methylene or substituted methylene bridges in the polymer. Suitable aldehyde condensation polymers include those from formaldehyde and phenol, urea, melamine, melamine/urea, acetone, resorcinol or phenol/resorcinol. The weight ratio of amine to aldehyde polymer is desirably 0À05-2 : 1. The modified polymer may be mixed with an aldehyde, alone or mixed with a thickener, to give a fast-curing composition. In the examples a "high-ortho" phenol-formaldehyde prepolymer is modified with 3 : 5- diaminobenzoic acid, 4-amino-salicylic acid, o- or m-hydroxyaniline, o-, m- or p-phenylene diamine, 1 : 2 : 4- or 1 : 3 : 5-triaminobenzene, 1 : 3 - diamino - 4 - methoxybenzene, 1 : 3- diamino - 4 - nitro - benzene, 1 : 4 - diamino - 3- nitrobenzene, 2 : 4-diaminotoluene, 2 : 4-diamino - diphenylamine, 2 : 4 - diamino - acetanilide, or m-xylylene-diamine, then acidified with concentrated HCl and cured using formaldehyde in methanol/water thickened with asbestos. In Examples 8-13 the starting resins used are urea-formaldehyde, urea-melamineformaldehyde, phenol-formaldehyde or acetone-formaldehyde, and the amines used are m-hydroxyaniline, diaminoacetanilide or mxylylene-diamine. |
