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US 4,248,992 AGranted
Gaunidyl-containing organosilicon compounds
AssigneeShin-Etsu Chemical Co., Ltd.
InventorToshio Takago
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AssigneeShin-Etsu Chemical Co., Ltd.
InventorToshio Takago
Estimating the term…
The invention provides a novel class of organosilicon compounds having in a molecule at least one monovalent guanidyl group represented by the general formula ##STR1## in which R is a hydrogen atom or a monovalent hydrocarbon group. Typical examples of the organosilicon compounds are 2-[3-(trimethoxysilyl)propyl]-1,1,3,3-tetramethylguanidine and 2-[3-(methyldimethoxysilyl)propyl]-1,1,3,3-tetramethylguanidine as well as the organopolysiloxanes as the hydrolysis-condensation products of these guanidyl-containing organosilanes. The guanidyl-containing organosilicon compounds are readily synthesized by the dehydrohalogenation reaction between an organosilicon compound having in a molecule at least one halogen-substituted monovalent hydrocarbon group and a guanidine compound in the presence of an acid acceptor. The guanidyl-containing organosilicon compounds are useful in preventing growth of microbial organisms, e.g. molds, on the surface of articles made of various rubbers and plastics, especially, silicone rubbers.
A shaped article of a rubber or plastic comprising from 0.05 to 3% by weight of an organosilicon compound having in a molecule at least one monovalent guanidyl group represented by the general formula ##STR20## wherein R is a hydrogen atom or monovalent hydrocarbon group, said guanidyl group being bonded to the silicon atom of the organosilicon compound by a divalent hydrocarbon group.
A method for preventing growth of microbial organisms on the surface of a shaped article of a rubber or plastic which comprises adding from 0.05 to 3% by weight of an organosilicon compound having in a molecule at least one guanidyl group represented by the general formula ##STR21## wherein R is a hydrogen atom or a monovalent hydrocarbon group, said guanidyl group being bonded to the silicon atom of the organosilicon compound by a divalent hydrocarbon group, to the rubber or plastic before the rubber or plastic is shaped.
A method for the preparation of an organosilicon compound having in a molecule at least one guanidyl group represented by the general formula ##STR22## wherein R is a hydrogen atom or a monovalent hydrocarbon group, said guanidyl group being bonded to the silicon atom of the organosilicon compound by a divalent hydrocarbon group, which comprises reacting an organosilicon compound having in a molecule at least one halogen-substituted monovalent hydrocarbon group with a guanidine compound represented by the general formula
Dependencies are inferred from the claim text.