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
1976-12-01
1979-03-20
Cockeram, H.S.
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...
260 304N, 260 312N, 260 314R, 260 328N, 260 336UB, 260 338UB, 528 44, 528 54, 528 55, 528 58, 528 76, 528 80, 528 85, C08G 1810, C08G 1842, C08G 1848, C08G 1882
Patent
active
041455150
ABSTRACT:
Methods of forming liquid, low viscosity, low molecular weight, cross-linkable, stable polyurethane prepolymers which comprise: reacting polyisocyanates, and preferably aliphatic and cycloaliphatic diisocyanates, with polyhydroxy compounds or polyols, and preferably diols, triols, tetrols, and mixtures thereof; the polyols having a molecular weight of from about 62 to about 3000; the polyisocyanates and the polyols being added to the reaction mixture in an NCO/OH ratio in the range of from about 0.7:1 to about 6:1, and preferably from about 1.6:1 to about 4:1; the reaction taking place preferably in an inert, non-reactive organic solvent such as xylene; in the absence of any reaction catalysts, or in the presence of a relatively very low concentration of reaction catalysts of from about 0.00005% by weight to about 0.8% by weight, based on the total weight of the reaction mixture; at a reaction temperature of from about 0.degree. C. to about 70.degree. C., and preferably from about 0.degree. C. to about 40.degree. C., for a reaction time of from about 1/2 hour to about 12 hours; and terminating the reaction short of completion at a percent completion of reaction of from about 2% to about 95%, and preferably from about 30% to about 80%. The resulting liquid, low viscosity, low molecular weight, cross-linkable, stable polyurethane prepolymers are also included in the inventive concept.
REFERENCES:
patent: B471405 (1976-02-01), Barron
patent: 2901467 (1959-08-01), Croco
patent: 3012987 (1961-12-01), Ansul
patent: 3043801 (1962-07-01), Wagner et al.
patent: 3049513 (1962-08-01), Damusis et al.
patent: 3049515 (1962-08-01), Damusis
patent: 3351573 (1967-11-01), Skreckoski
patent: 3436361 (1969-04-01), Wooster
patent: 3549569 (1970-12-01), Farah et al.
patent: 3639355 (1972-02-01), Wooster et al.
patent: 3642703 (1972-02-01), Suzuki et al.
patent: 3705132 (1972-12-01), Cuscurida
Sienko et al. -- Chemistry (2nd Ed.) (McGraw-Hill) (N.Y.) (1961), pp. 237-241.
Saunders et al. -- Polyurethanes (part 1, Chemistry), pp. 152-154 (1962); (part 2, Technology), p. 532 (1964), (Interscience) (N.Y.).
Conger Robert P.
Pogozelski Vincent F.
Cockeram H.S.
Congoleum Corporation
Laughlin Richard T.
LandOfFree
Method of forming storage-stable polyurethane prepolymers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of forming storage-stable polyurethane prepolymers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of forming storage-stable polyurethane prepolymers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-221889