# US 5,708,103 A · Process for producing a polymer of vinylic compounds > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,103 A - Document ID: US5708103A - Status: Granted - Kind: A - Application number: 08/592,628 - Filed: 1996-01-26 - Granted: 1998-01-13 - Earliest claimed: 1995-02-01 - Assignees: Kuraray Co., Ltd. - Inventors: Satoshi Kajiya; Kenji Shachi; Kazushige Ishiura - Web page: https://patentgrep.com/patent/US5708103A ## CPC - C08F 4/14: Boron halides or aluminium halides; Complexes thereof with organic compounds containing oxygen - C08F 297/00: Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS ## Abstract A process for producing a polymer of vinylic compounds comprising polymerizing at least one vinylic compound by using an initiator system comprising a compound containing, in the molecule, at least one group represented by the general formula: --C(--R.sup.1)(R.sup.2)--X (I) where each of R.sup.1 and R.sup.2 represents an alkyl, aryl or aralkyl group, and X represents an acyloxyl, alkoxyl or hydroxyl group or a halogen atom, and a Lewis acid, wherein (1) at least one of pyridine derivative (A) selected from the group consisting of a pyridine derivative (A-1) substituted at 2-position and 6-position with methyl group respectively and a pyridine derivative (A-2) substituted at 2-position with an alkyl group of 2 to 6 carbon atoms and not substituted at 6-position, and (2) an organic Lewis base (B) other than said pyridine derivative (A) are present together in the polymerizing reaction system. ## Claims ### Claim 1 A process for producing a polymer of vinylic compounds in which at least one unsubstituted or halogen-substituted vinylic hydrocarbon compound is polymerized by using an initiator system comprising a compound containing, in the molecule, at least one group represented by the general formula: --C(--R.sup.1) (R.sup.2)--X (I) where each of R.sup.1 and R.sup.2 represents an alkyl, aryl, or aralkyl group, and X represents an acyloxyl, alkoxyl, or hydroxyl group or a halogen atom, and a Lewis acid, wherein (1) at least one pyridine derivative (A) selected from the group consisting of a pyridine derivative (A-1) substituted at 2-position and 6-position with methyl group respectively and a pyridine derivative (A-2) substituted at 2-position with an alkyl group of 2 to 6 carbon atoms and not substituted at 6-position, and (2) an organic Lewis base (B) other than said pyridine derivative (A), are present together in the polymerizing reaction system. ### Claim 2 (depends on 1) A process of claim 1, wherein the pyridine derivative (A) is the pyridine derivative (A-1) substituted at 2-position and 6-position with methyl group respectively. ### Claim 3 (depends on 2) A process of claim 2, wherein the pyridine derivative (A-1) is a compound represented by the general formula: ##STR3## where each of R.sup.3, R.sup.4 and R.sup.5 represents a hydrogen atom or an alkyl group, providing that the sum of the number of carbon atoms contained in R.sup.3, R.sup.4 and R.sup.5 is an integer within a range from 0 to 3. ### Claim 4 A process claim of 3, wherein the pyridine derivative (A-1) is 2,6-dimethylpyridine. ### Claim 5 (depends on 1) A process of claim 1, wherein the organic Lewis base (B) is an organic Lewis base having not more than 10 carbon atoms in the molecule. ### Claim 6 (depends on 1) A process of claim 1, wherein the organic Lewis base (B) is at least one compound selected from the group consisting of pyridines having no substituent at either 2-position or 6-position, amines, carboxylic acid esters, ethers, carboxylic acid amides, ketones, sulfinyl compounds and phosphoric acid amides. ### Claim 7 (depends on 1) A process of claim 1, wherein the mol number of the pyridine derivative (A) is within a range from 0.1 to 100 times the mol number of the group shown by the general formula (I). ### Claim 8 (depends on 1) A process of claim 1, wherein the mol number of the Lewis acid is not less than the sum of the mol number of the group shown by the general formula (I), the pyridine derivative (A) and the organic Lewis base (B) and is within a range from 1 to 100 times the mol number of the group shown by the general formula (I). ### Claim 9 (depends on 1) A process of claim 1, wherein the mol number of the organic Lewis base (B) is within a range from 0.1 to 100 times the mol number of the group shown by the general formula (I). ### Claim 10 (depends on 1) A process of claim 1, wherein a block copolymer is produced by adding plural kinds of unsubstituted or halogen-substituted vinylic hydrocarbon compounds successively to the polymerizing reaction system. ### Claim 11 (depends on 1) A process of claim 1, wherein the resultant reaction mixture is washed with an aqueous liquid after the completion of the polymerizing reaction.