SYNTHESIS OF STEREOSPECIFIC AND ATACTIC POLY(LACTIC ACID)S
Isotactic poly ((R)-lactic acid) or isotactic poly (S)-lactic arerespectively prepared from (R,R)-lactide and (S,S)-lactide using a catalyst which has a zinc center or a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating...
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| creator | COATES, GEOFFREY, W CHAMBERLAIN, BRADLEY, M CHENG, MING |
| description | Isotactic poly ((R)-lactic acid) or isotactic poly (S)-lactic arerespectively prepared from (R,R)-lactide and (S,S)-lactide using a catalyst which has a zinc center or a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group. Heterotactic poly(lactic acid) is prepared from rac-lactide using a catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group; heterotactic poly(lactic acid) is a novel composition. The catalyst with a magnesium center is a novel catalyst. Syndiotactic poly(lactic acid) is prepared from meso-lactide using a syndiotactic poly(lactic acid) effecting catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group diiminate substituted with isopropyl substituted pheny and the ligand which is not a propagating group and the preferred catalyst contains as the propagating group is isopropoxide. Atactic poly(lactic acid) of polydispersity ranging from 1.15 to 1.40 is prepared in less than 10 minutes by polymerizing rac-lactide in the presence of C>14< alcohol and a catalyst with a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group.
La présente invention concerne la préparation de l'acide poly((R)- lactique) isostatique ou de l'acide poly (S)- lactique isostatique à partir de (R,R)-lactide et (S,S)-lactide avec un catalyseur présentant un centre zinc ou un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation. L'acide poly(lactique) hétérotactique est préparé à partir de rac-lactide en utilisant un catalyseur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; l'acide poly(lactique) hétérotactique étant une nouvelle composition. Le catalyseur comportant un centre magnésium est un nouveau catalyseur. L'acide poly(lactique) syndiotactique est préparé à partir de meso-lactide en utilisant un catalyseur effecteur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; le catalyseur préféré contenant comme ligand qui n'est pas un groupe de propagation du diiminate substitué par un phényle substitué par un isopropyle, le groupe de prolifération étant de l'isopropoxyde. L'acide polylactique de polyd |
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La présente invention concerne la préparation de l'acide poly((R)- lactique) isostatique ou de l'acide poly (S)- lactique isostatique à partir de (R,R)-lactide et (S,S)-lactide avec un catalyseur présentant un centre zinc ou un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation. L'acide poly(lactique) hétérotactique est préparé à partir de rac-lactide en utilisant un catalyseur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; l'acide poly(lactique) hétérotactique étant une nouvelle composition. Le catalyseur comportant un centre magnésium est un nouveau catalyseur. L'acide poly(lactique) syndiotactique est préparé à partir de meso-lactide en utilisant un catalyseur effecteur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; le catalyseur préféré contenant comme ligand qui n'est pas un groupe de propagation du diiminate substitué par un phényle substitué par un isopropyle, le groupe de prolifération étant de l'isopropoxyde. L'acide polylactique de polydispersité compris entre 1,15 et 1,40 est préparé en moins de 10 minutes en polymérisant rac-lactide en présence de C>1<-C>4< alcool et d'un catalyseur avec un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation.</description><edition>7</edition><language>eng ; fre</language><subject>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY ; CHEMISTRY ; COMPOSITIONS BASED THEREON ; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS ; METALLURGY ; ORGANIC MACROMOLECULAR COMPOUNDS ; PERFORMING OPERATIONS ; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL ; THEIR PREPARATION OR CHEMICAL WORKING-UP ; THEIR RELEVANT APPARATUS ; TRANSPORTING</subject><creationdate>2001</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20010517&DB=EPODOC&CC=WO&NR=0134555A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20010517&DB=EPODOC&CC=WO&NR=0134555A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>COATES, GEOFFREY, W</creatorcontrib><creatorcontrib>CHAMBERLAIN, BRADLEY, M</creatorcontrib><creatorcontrib>CHENG, MING</creatorcontrib><title>SYNTHESIS OF STEREOSPECIFIC AND ATACTIC POLY(LACTIC ACID)S</title><description>Isotactic poly ((R)-lactic acid) or isotactic poly (S)-lactic arerespectively prepared from (R,R)-lactide and (S,S)-lactide using a catalyst which has a zinc center or a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group. Heterotactic poly(lactic acid) is prepared from rac-lactide using a catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group; heterotactic poly(lactic acid) is a novel composition. The catalyst with a magnesium center is a novel catalyst. Syndiotactic poly(lactic acid) is prepared from meso-lactide using a syndiotactic poly(lactic acid) effecting catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group diiminate substituted with isopropyl substituted pheny and the ligand which is not a propagating group and the preferred catalyst contains as the propagating group is isopropoxide. Atactic poly(lactic acid) of polydispersity ranging from 1.15 to 1.40 is prepared in less than 10 minutes by polymerizing rac-lactide in the presence of C>1<-C>4< alcohol and a catalyst with a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group.
La présente invention concerne la préparation de l'acide poly((R)- lactique) isostatique ou de l'acide poly (S)- lactique isostatique à partir de (R,R)-lactide et (S,S)-lactide avec un catalyseur présentant un centre zinc ou un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation. L'acide poly(lactique) hétérotactique est préparé à partir de rac-lactide en utilisant un catalyseur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; l'acide poly(lactique) hétérotactique étant une nouvelle composition. Le catalyseur comportant un centre magnésium est un nouveau catalyseur. L'acide poly(lactique) syndiotactique est préparé à partir de meso-lactide en utilisant un catalyseur effecteur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; le catalyseur préféré contenant comme ligand qui n'est pas un groupe de propagation du diiminate substitué par un phényle substitué par un isopropyle, le groupe de prolifération étant de l'isopropoxyde. L'acide polylactique de polydispersité compris entre 1,15 et 1,40 est préparé en moins de 10 minutes en polymérisant rac-lactide en présence de C>1<-C>4< alcool et d'un catalyseur avec un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation.</description><subject>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY</subject><subject>CHEMISTRY</subject><subject>COMPOSITIONS BASED THEREON</subject><subject>MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS</subject><subject>METALLURGY</subject><subject>ORGANIC MACROMOLECULAR COMPOUNDS</subject><subject>PERFORMING OPERATIONS</subject><subject>PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL</subject><subject>THEIR PREPARATION OR CHEMICAL WORKING-UP</subject><subject>THEIR RELEVANT APPARATUS</subject><subject>TRANSPORTING</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2001</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLAKjvQL8XAN9gxW8HdTCA5xDXL1Dw5wdfZ083RWcPRzUXAMcXQOAbID_H0iNXwgbEdnTxfNYB4G1rTEnOJUXijNzaDg5hri7KGbWpAfn1pckJicmpdaEh_ub2BobGJqaupoaEyEEgBd7yiF</recordid><startdate>20010517</startdate><enddate>20010517</enddate><creator>COATES, GEOFFREY, W</creator><creator>CHAMBERLAIN, BRADLEY, M</creator><creator>CHENG, MING</creator><scope>EVB</scope></search><sort><creationdate>20010517</creationdate><title>SYNTHESIS OF STEREOSPECIFIC AND ATACTIC POLY(LACTIC ACID)S</title><author>COATES, GEOFFREY, W ; CHAMBERLAIN, BRADLEY, M ; CHENG, MING</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_WO0134555A13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng ; fre</language><creationdate>2001</creationdate><topic>CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY</topic><topic>CHEMISTRY</topic><topic>COMPOSITIONS BASED THEREON</topic><topic>MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS</topic><topic>METALLURGY</topic><topic>ORGANIC MACROMOLECULAR COMPOUNDS</topic><topic>PERFORMING OPERATIONS</topic><topic>PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL</topic><topic>THEIR PREPARATION OR CHEMICAL WORKING-UP</topic><topic>THEIR RELEVANT APPARATUS</topic><topic>TRANSPORTING</topic><toplevel>online_resources</toplevel><creatorcontrib>COATES, GEOFFREY, W</creatorcontrib><creatorcontrib>CHAMBERLAIN, BRADLEY, M</creatorcontrib><creatorcontrib>CHENG, MING</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>COATES, GEOFFREY, W</au><au>CHAMBERLAIN, BRADLEY, M</au><au>CHENG, MING</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>SYNTHESIS OF STEREOSPECIFIC AND ATACTIC POLY(LACTIC ACID)S</title><date>2001-05-17</date><risdate>2001</risdate><abstract>Isotactic poly ((R)-lactic acid) or isotactic poly (S)-lactic arerespectively prepared from (R,R)-lactide and (S,S)-lactide using a catalyst which has a zinc center or a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group. Heterotactic poly(lactic acid) is prepared from rac-lactide using a catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group; heterotactic poly(lactic acid) is a novel composition. The catalyst with a magnesium center is a novel catalyst. Syndiotactic poly(lactic acid) is prepared from meso-lactide using a syndiotactic poly(lactic acid) effecting catalyst which has a zinc center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group diiminate substituted with isopropyl substituted pheny and the ligand which is not a propagating group and the preferred catalyst contains as the propagating group is isopropoxide. Atactic poly(lactic acid) of polydispersity ranging from 1.15 to 1.40 is prepared in less than 10 minutes by polymerizing rac-lactide in the presence of C>1<-C>4< alcohol and a catalyst with a magnesium center and two ligands where one of the ligands is a propagating group and the other of the ligands is not a propagating group.
La présente invention concerne la préparation de l'acide poly((R)- lactique) isostatique ou de l'acide poly (S)- lactique isostatique à partir de (R,R)-lactide et (S,S)-lactide avec un catalyseur présentant un centre zinc ou un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation. L'acide poly(lactique) hétérotactique est préparé à partir de rac-lactide en utilisant un catalyseur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; l'acide poly(lactique) hétérotactique étant une nouvelle composition. Le catalyseur comportant un centre magnésium est un nouveau catalyseur. L'acide poly(lactique) syndiotactique est préparé à partir de meso-lactide en utilisant un catalyseur effecteur comportant un centre zinc et deux ligands dont l'un seulement est un groupe de propagation; le catalyseur préféré contenant comme ligand qui n'est pas un groupe de propagation du diiminate substitué par un phényle substitué par un isopropyle, le groupe de prolifération étant de l'isopropoxyde. L'acide polylactique de polydispersité compris entre 1,15 et 1,40 est préparé en moins de 10 minutes en polymérisant rac-lactide en présence de C>1<-C>4< alcool et d'un catalyseur avec un centre magnésium et deux ligands dont l'un seulement est un groupe de propagation.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING |
| title | SYNTHESIS OF STEREOSPECIFIC AND ATACTIC POLY(LACTIC ACID)S |
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