Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1977-11-09
1980-12-16
Henderson, C. A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
210688, 252180, 525352, 526288, C08F 834, C02B 142
Patent
active
042398657
ABSTRACT:
A new polyvinyl(dialkylthiocarbamoylthio)acetate resin expressed by the formula ##STR1## (wherein R.sub.1 and R.sub.2 each represent hydrogen atom or an alkyl group of C.sub.1 -C.sub.5) is provided.
Said resin has a superior heavy metals-removing performance and is insoluble in organic solvents and hence very useful as an agent for removing heavy metals.
Said resin is prepared by reacting a tetraalkylthiuramdisulfide expressed by a formula ##STR2## (wherein R.sub.3, R.sub.4, R.sub.5 and R.sub.6 each represent hydrogen atom or an alkyl group of C.sub.1 -C.sub.5) with a vinyl acetate polymer on heating in a solvent.
Said resin is used as an agent for removing heavy metals, alone or in admixture with an auxiliary agent such as active carbon.
REFERENCES:
patent: 2274616 (1942-02-01), Raynolds
patent: 2388169 (1945-10-01), McAlevy
Hayashi Masaki
Kaku Kanji
Nakamura Takao
Ohishi Shigeo
Tarao Ryohkichi
Chisso Corporation
Henderson C. A.
Philpitt Fred
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