Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1995-06-06
1996-12-03
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
229100, 229939, 427391, 427392, 427393, 427428, 428264, 428274, 428378, 428393, 428396, 428533, 428534, 428535, 4285371, 4285375, 527103, 527301, 524 35, 524311, 524312, 524589, 524773, 524871, C08K 510, C08K 5101, C08K 511, B65D 2500, B65D 2534, B65D 500, C08G 1802, B32B 2906
Patent
active
055809227
ABSTRACT:
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 impregnant 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.
REFERENCES:
patent: 5008359 (1991-04-01), Hunter
patent: 5041517 (1991-08-01), Vu et al.
patent: 5104086 (1992-08-01), Hunter et al.
patent: 5130205 (1992-07-01), Vu et al.
patent: 5220760 (1993-06-01), Dimakis
patent: 5280097 (1994-01-01), Hunter et al.
patent: 5292391 (1994-03-01), Wallick
patent: 5332458 (1994-07-01), Wallick
patent: 5345738 (1994-09-01), Dimakis
patent: 5352709 (1994-10-01), Tarrant et al.
Hunter Frank R.
Park David W.
Seidleck James J.
Sergent Rabon
Weyerhaeuser Company
LandOfFree
Cellulose products treated with isocyanate compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Cellulose products treated with isocyanate compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cellulose products treated with isocyanate compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-786185