Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1997-10-30
2000-12-05
Truong, Duc
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 76, 528 85, 521159, 521160, 521174, 521176, C08G 1832, C08G 1848
Patent
active
061568643
ABSTRACT:
Propylene oxide is added to an active hydrogen compound in the presence of an alkali metal hydroxide catalyst in an amount of from 0.05 to 0.5 mole per mole of the active hydrogen compound at a reaction temperature of from 60 to 98.degree. C. at a reaction pressure less than or equal to 4 kg/cm.sup.2 to prepare a polyoxyalkylene polyol which has a hydroxyl value of from 10 to 35 mg KOH/g, a monool content less than or equal to 15 mol %, a Head-to-Tail bond selectivity greater than or equal to 96 percent, and low viscosity. A polymer polyol is prepared by polymerizing an ethylenically unsaturated monomer in the polyoxyalkylene polyol. A flexible polyurethane foam is prepared by reacting the polyoxyalkylene polyol or the polymer polyol with an organic polyisocyanate compound in the presence of a foaming agent, a catalyst, a surfactant, a crosslinking agent and other additives. The thus-obtained polyurethane foams have less closed cells and are more excellent in properties such as hardness, humid aged compression set and impact resiliency.
REFERENCES:
patent: 3393243 (1968-07-01), Cuscurida
patent: 3829505 (1974-08-01), Herold
patent: 3953393 (1976-04-01), Ramlow et al.
patent: 4463107 (1984-07-01), Simroth et al.
patent: 5093380 (1992-03-01), Takeyasu et al.
patent: 5674920 (1997-10-01), Obata et al.
Aldrich Catalogue 1996--p. 313.
Izukawa Tsukuru
Kunihiro Tamotsu
Nishikawa Ariko
Ohkubo Kazuhiko
Sakaki Yoshitsugu
Mitsui Chemicals Inc.
Truong Duc
LandOfFree
Preparation of flexible polyurethane foams does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preparation of flexible polyurethane foams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preparation of flexible polyurethane foams will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-962646