Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1984-05-23
1985-07-02
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
252182, 264 51, 2643281, 2643286, 2643288, 521159, 521163, 528 64, 528 76, 528 83, C08G 1814
Patent
active
045269050
ABSTRACT:
Dialkyl diamines for use with polyols and polyisocyanates in cast elastomer and reaction injection molding polyurethane processes. The dialkyl diamines are prepared by nitration and reduction of dialkylbenzenes or alkylation of meta-phenylenediamine. The chain extenders have the following structure: ##STR1## where R.sub.1 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl and R.sub.2 is C.sub.2 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl.
Contrary to the teachings of the prior art the novel diamines have surprisingly good reaction times to form polyurethanes with excellent physical properties. Furthermore, little or no mold release is required in RIM and other processes using the chain extenders of the invention.
REFERENCES:
patent: 2683730 (1954-07-01), Seeger et al.
patent: 3362979 (1968-01-01), Bentley
patent: 3428610 (1969-02-01), Klebert
patent: 4218543 (1980-08-01), Weber et al.
patent: 4314962 (1982-02-01), Wollensak et al.
patent: 4420570 (1983-12-01), Dominguez
Polyurethanes, Chemistry and Technology, Saunders & Frisch, Interscience Publishers, 1964, pp. 116-117 & 231-233.
Journal of Organic Chemistry, vol. 46, Beak et al., p. 2368, (1981).
Filbey Allen H.
Lucast Donald H.
Shubkin Ronald L.
Wollensak John C.
Ethyl Corporation
Hunt John F.
Johnson Donald L.
Sieberth John F.
Welsh Maurice J.
LandOfFree
Polyurethanes from dialkyl diaminobenzenes and processes therefo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyurethanes from dialkyl diaminobenzenes and processes therefo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyurethanes from dialkyl diaminobenzenes and processes therefo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-381817