Process for producing cationic dye-dyeable polyester fiber with high strength and polyester resin composition used therefor
AssigneeKao Corporation
InventorsAkito Itoi, Isao Nishi, Yasuo Ishii, Toshio Sato
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Abstract
A cationic dye-dyeable polyester resin composition comprising a cationic dye-dyeable polyester resin and a melt viscosity depressant. Addition of the melt viscosity depressant to the cationic dye-dyeable polyester resin reduces the melt viscosity of the resin without decreasing the intrinsic viscosity thereby making the resin melt-spinnable. A cationic dye-dyeable polyester fiber with high strength can be obtained from the polyester resin composition.
Claims4
A cationic dye-dyeable polyester resin composition comprising:
- (A) a cationic dye-dyeable polyester resin comprising (a) a bifunctional carboxylic acid component mainly comprised of terephthalic acid or an ester-forming derivative thereof, (b) an alkylene glycol or an ester-forming derivative thereof, and (c) 0.1 to 10 mol% based on the total amount of said polyester resin of a sulfonic acid salt represented by Formula (I):
- ##STR17## wherein A represents an aromatic or aliphatic group;
- X.sub.1 represents an ester-forming functional group;
- X.sub.2 represents a hydrogen atom or an ester-forming functional group which may be the same as or different from X.sub.1 ;
- M.sup.n+ represents an alkali metal cation, an alkaline earth metal cation, or an onium;
- and n represents 1 or 2;
- and
- (B) 0.5 to 10 parts by weight per 100 parts by weight of said polyester resin of at least one compound selected from the group consisting of
- a compound represented by Formula (II):
- ##STR18## wherein B.sub.1 and B.sub.2 each represent an alkyl group or arylalkyl group having from 6 to 18 carbon atoms;
- X represents ##STR19## --C--, --S--, --SO.sub.2 --, or --O--, wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having not more than 4 carbon atoms;
- and p represents 0 or 1,
- a compound represented by Formula (III):
- ##STR20## wherein X and p are as defined above;
- and R.sub.3 and R.sub.4 each represent an alkyl group;
- and q and m each represent O or an integer of from 1 to 4, with the sum of q and m ranging from 1 to 4;
- provided that the total carbon atom number of (R.sub.3).sub.q and (R.sub.4).sub.m is from 12 to 54.
A process for producing a cationic dye-dyeable polyester fiber comprising adding 0.5 to 10 parts by weight of at least one compound selected from the group consisting of a compound represented by Formula (II):
- ##STR21## wherein B.sub.1 and B.sub.2 each represent an alkyl group or arylalkyl group having from 6 to 18 carbon atoms;
- X represents ##STR22## --C--, --S--, --SO.sub.2 --, or --O--, wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or an alkyl group having not more than 4 carbon atoms;
- and p represents 0 or 1,
- a compound represented by Formula (III):
- ##STR23## wherein X and p are as defined above;
- and R.sub.3 and R.sub.4 each represent an alkyl group;
- and q and m each represent 0 or an integer of from 1 to 4, with the sum of q and m ranging from 1 to 4;
- provided that the total carbon atom number of (R.sub.3).sub.q and (R.sub.4).sub.m is from 12 to 54,
- to 100 parts by weight of a cationic dye-dyeable polyester resin comprising (a) a bifunctional carboxylic acid component mainly comprised of terephthalic acid or an ester-forming derivative thereof, (b) an alkylene glycol or an ester-forming derivative thereof, and (c) 0.1 to 10 mol% based on the total amount of said polyester resins of a sulfonic acid salt represented by Formula (I):
- ##STR24## wherein A represents an aromatic or aliphatic group;
- X.sub.1 represents an ester-forming functional group;
- X.sub.2 represents a hydrogen atom or an ester-forming functional group which may be the same as or different from X.sub.1 ;
- M.sup.n+ represents an alkali metal cation, an alkaline earth metal cation, or an onium;
- and n represents 1 or 2,
- and melt-spinning the resulting cationic dye-dyeable polyester resin composition.
Dependencies are inferred from the claim text.