Biodegradable optically active polymers and intermediate oligomers thereof, and process for producing them
AssigneeTakasago International Corporation
InventorsAkio Yamaguchi, Yoji Hori, Takashi Imai, Motoki Suzuki, Susumu Akutagawa
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Abstract
An optically active oligomer obtained by polycondensation of an (R)-3-hydroxyalkanoic acid alkyl ester and at least one of a diol, a diamine and an amino alcohol and an optically active polymer obtained by copolymerization of said oligomer and a monomer selected from diisocyanic acid esters, dicarboxylic acid derivatives, and dichlorosilanes are disclosed. Novel functional polymers with biodegradability and hydrolyzability are produced with industrial advantage.
Claims2
An optically active polymer comprising a 3-hydroxyalkanoic acid ester unit represented by formula (II):
- ##STR9## wherein R.sup.1 represents an alkyl group having from 1 to 5 carbon atoms;
- R.sup.3 represents a branched or straight chain alkylene group having from 2 to 6 carbon atoms, a straight chain alkenylene group having from 4 to 6 carbon atoms, a straight chain alkynylene group having from 4 to 6 carbon atoms, an oxyalkylene group having from 5 to 8 carbon atoms, or a 1,4-phenylenedimethylene group;
- Y.sup.1 and Y.sup.2 each represent an oxygen atom;
- X represents ##STR10## R.sup.4 represents an alkylene group having from 1 to 10 carbon atoms, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted methylenebiphenyl group;
- and m and n each represents zero or an integer of from 1 to 20, provided that m and n do not simultaneously represent zero.
A process for producing an optically active polymer comprising a 3-hydroxyalkanoic acid ester unit represented by formula (II):
- ##STR11## wherein R.sup.1 represents an alkyl group having from 1 to 5 carbon atoms;
- R.sup.3 represents a branched or straight chain alkylene group having from 2 to 6 carbon atoms, a straight chain alkenylene group having from 4 to 6 carbon atoms, a straight chain alkynylene group having from 4 to 6 carbon atoms, an oxyalkylene group having from 5 to 8 carbon atoms, or a 1,4-phenylenedimethylene group;
- Y.sup.1 and Y.sup.2 each represent an oxygen atom;
- X represents ##STR12## R.sup.4 represents an alkylene group having from 1 to 10 carbon atoms, a substituted or unsubstituted phenylene group, a substituted or unsubstituted biphenylene group, or a substituted or unsubstituted methylenebiphenyl group;
- and m and n each represents zero or an integer of from 1 to 20, provided that m and n do not simultaneously represent zero,
- comprising polycondensing an optically active oligomer represented by formula (I):
- ##STR13## wherein R.sup.1, R.sup.3, Y.sup.1 Y2, m and n are as defined above, with a diisocyanic acid ester represented by formula (VIII):
- O.dbd.C.dbd.N--R.sup.4 --N.dbd.C.dbd.O (VIII)
- wherein R.sup.4 is as defined above.
Dependencies are inferred from the claim text.