Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Patent
1994-05-12
1996-12-17
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
528 1, 528488, 528489, 528491, 528502, 524376, 524498, 5245755, C08C 114, C08C 115, C08C 104
Patent
active
055854591
ABSTRACT:
A process for producing raw rubber from a deproteinized natural rubber is disclosed, which comprises coagulating rubber particles in the deproteinized natural rubber latex by: (1) adding a nonionic surfactant having a cloud point of from 20.degree. to 100.degree. C. and a molecular weight of 300 or more to the deproteinized natural rubber latex and heating the latex to a temperature not lower than the cloud point of the nonionic surfactant; or (2) adding a coagulation assistant selected from the group consisting of: (a) an anionic surfactant, (b) an amphoteric surfactant, (c) a nonionic surfactant, (d) a nonionic or amphoteric oligomer or polymer, and (e) an anionic oligomer or polymer, to the deproteinized natural rubber latex; and then recovering the coagulated rubber particles. According to the process of the present invention, raw rubber containing substantially no metal ion can be produced with a high efficiency.
REFERENCES:
patent: 2061276 (1936-11-01), Ingmanson
patent: 2097481 (1937-11-01), Wallerstein
patent: 2399156 (1946-04-01), Stamberger et al.
patent: 3761455 (1973-09-01), Tanaka et al.
patent: 4379095 (1983-04-01), Oldack
patent: 4455265 (1984-06-01), Haldeman
Hayashi Masaharu
Hioki Yuichi
Ichikawa Naoya
Sakaki Toshiaki
Tanaka Yasuyuki
Asinovsky Olga
Kao Corporation
Michl Paul R.
Sumitomo Rubber Industries Ltd.
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