Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1992-06-15
1993-12-28
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
25218222, 25218226, 521174, 528 78, C08J 1124
Patent
active
052740048
ABSTRACT:
A process for the recovery of scrap polyurethane polymer in the form of a polyol, and the use of said polyol to prepare a fresh polyurethane polymer. Said process involves thermally treating scrap polyurethane at an elevated temperature with a liquid mixture which consists of an alkanolamine and a metal hydroxide and subsequently reacting the resulting intermediate product with an alkylene oxide comprising propylene oxide to obtain polyol. The recovery process is characterized in that the weight ratio of scrap polyurethane to liquid mixture is from at least 12:1, and the liquid mixture contains the alkanolamine in from about 70 to about 95 weight percent. The recovered polyol can be used to prepare fresh polyurethane foam that exhibits enhanced physical properties at a reduced isocyanate consumption compared to similar foam prepared in the absence of any recovered polyol.
REFERENCES:
patent: 2937151 (1960-05-01), Ten Brocck et al.
patent: 3117940 (1964-01-01), McElroy
patent: 3300417 (1967-01-01), McElroy
patent: 3404103 (1968-10-01), Matsuoaira et al.
patent: 3441616 (1969-04-01), Pizzini et al.
patent: 3632530 (1972-01-01), Kinoshita
patent: 3708440 (1973-01-01), Frulla et al.
patent: 3738946 (1973-06-01), Frulls et al.
patent: 4110266 (1978-08-01), Sheratte
Johnson Rachel
The Dow Chemical Company
Welsh Maurice J.
LandOfFree
Process for conversion of polyurethane polymer to polyol and fre does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for conversion of polyurethane polymer to polyol and fre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for conversion of polyurethane polymer to polyol and fre will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1542985