Abstract: A method for producing chlorosilanes, which are useful in a wide range of industrial field as an intermediate for organosilicon products such as silicone rubbers, silicone oils, silicone resins, etc. as well as a raw material for the production of organic chemicals such as medicines, agricultural chemicals, dyestuffs, etc., represented by the general formula, ##STR1## wherein R.sub.1 and R.sub.4, which may be the same or different, represent an alkyl group having from 1 to 5 carbon atoms, a chloromethyl group, an ethynyl group or a halogen atom; R.sub.2 and R.sub.3, which may be the same or different, represent an alkyl group having from 1 to 3 carbon atoms; R.sub.5 and R.sub.6, which may be the same or different, represent an alkyl group having from 1 to 2 carbon atoms; and R.sub.7 represents an alkyl group having from 1 to 18 carbon atoms, which comprises reacting a disiloxane represented by the general formula, ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.

Abstract: An aminophosphonic acid chelate resin, prepared by reacting an amino resin having amine-reactive groups (A) with an amino compound having one or more primary and/or secondary amino groups (B) to produce an aminated resin and subsequently reacting thus produced aminated resin with an alkylphosphonation agent (C), shows excellent adsorption ability of metal ions having low atomic weights such as calcium ions, magnesium ions, etc., when applied to a solution having high salt concentration.

Abstract: A chelate resin produced by reacting (A) a resin having one or more primary and/or secondary amino groups in the molecule with (B) a polyfunctional compound having at least two reactive groups with amine and (C) an amino compound having one or more primary and/or secondary amino groups, or with a reaction product of said (B) polyfunctional compound and said (C) amino compound, shows excellent heavy metal collecting ability without being influenced by other coexisting ions.