发明名称 |
ISOCYANATE COMPOSITIONS AND CELLULOSE PRODUCTS IMPREGNATED WITH THE COMPOSITIONS |
摘要 |
<p>The invention is directed to a composition of matter useful as a paper impregnant, to the method of its use, and to the products produced by the method. Poly (diphenylmethane diisocyanate) or PMDI has been used in the past as a paper impreg-nant with or without propylene carbonate as a diluent. These products have generally required pressing under high pressures and at elevated temperatures. It has now been found that triacetin and/or triethyl citrate in usages up to about 20% of PMDI give superior performance in impregnated products. The modified PMDI will cure at essentially ambient conditions in times as short as 1-2 days to insoluble polyureas with low residual amounts of isocyanates and reaction byproducts such as 4,4'-diaminodiphenylmethane. The treated papers can be used in applications of which skins for sandwich panels and high strength corrugated board would be exemplary.</p> |
申请公布号 |
CA2174585(A1) |
申请公布日期 |
1996.12.07 |
申请号 |
CA19962174585 |
申请日期 |
1996.04.19 |
申请人 |
WEYERHAEUSER COMPANY |
发明人 |
PARK, DAVID W.;HUNTER, FRANK R. |
分类号 |
B65D65/42;C08G18/16;C08G18/30;C08G18/64;C08K5/10;(IPC1-7):D21H17/08 |
主分类号 |
B65D65/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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