Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1992-08-21
1993-11-23
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524105, 525282, 525375, C08K 53415
Patent
active
052644723
ABSTRACT:
The present invention relates to a process for the preparation of N-(hydroxyphenyl)maleamic acid and various dimers and oligomers thereof. The process is characterized by heating, in the absence of any solvent, N-(hydroxyphenyl)maleamic acid at a temperature ranging from about 150.degree. to about 250.degree. C. in the presence of an acid catalyst. This unique process avoids the need to recover expensive highly polar solvents. The present invention also relates to use of these maleimide containing compounds in rubber. The use of the blend of hydroxyphenyl maleimide and the various dimers and low molecular weight oligomers impart superior properties to rubber when compared to the use of hydroxyphenyl maleimide alone in rubber.
REFERENCES:
patent: 4433114 (1984-02-01), Coran et al.
patent: 5049618 (1991-09-01), Wideman et al.
P. O. Tawney et al, "Vulcanization with Maleimides", J. Applied Polymer Sci., 8, 352-366 (1964).
Balogh George F.
Keith Denise J.
Schorr Gordon R.
Wideman Lawson G.
Anderson Harold D.
Hendricks Bruce J.
The Goodyear Tire & Rubber Company
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