Normal pressure cation dyeable polyester, textile product made from the same, and process for production of the same

Abstract

The present invention provides one kind of normal pressure dyeable polyester and its preparation process, and the polyester may be used in producing fiber product with stable quality and high light resistance no matter water color shade is. The present invention features that the polyester has main repetition units of ethylene terephthalate, and contains metal sulfonate containing isophthalic acid component in 2.0-3.0 mol% of the acid components, polyalkylene glycol of average molecular weight 150-600 in 1.5-4.0 wt% of polyester, diglycol in 4.5-6.5 mol% of the diol components and terminal carboxyl group concentration of 20-30 equivalent / ton.

Description

technical field [0001] The present invention relates to normal pressure cationic dyeable polyester which is dyeable to cationic dyes under normal pressure and its continuous production method. Background technique [0002] Since polyethylene terephthalate fibers can only be dyed with disperse dyes and azo dyes originally, there is a problem that it is difficult to obtain bright and deep hues. Various polyester resin materials have been proposed as a solution to this problem. [0003] For example, Patent Document 1 proposes a cationic dye-dyeable polyester obtained by copolymerizing 2 to 3 mol % of a sulfonic acid metal salt group-containing isophthalic acid component and polyester. [0004] In Patent Document 2, the following technical scheme is proposed: if it is copolymerized with polyethylene glycol with a molecular weight of 200 or more, due to the easy-to-stain effect, polyethylene glycol can exhibit a plasticizing effect, The thickening effect caused by the sulfonate...

AI Technical Summary

Problems solved by technology

However, due to the thickening effect due to the presence of sulfonate groups in this case, the degree of polymerization of the polymer does not increase but only the melt viscosity increases, the pressure increase speed of the spinning filter is fast, and the thread breakage occurs. Too many problems, spinning operability significantly decreased, etc.

[0015] However, if the polyethylene glycol copolyester described in Patent Document 2 is used, although the thickening effect caused by the sulfonate group can be weakened and the degree of polymerization of the polyester can be improved, there is a problem of poor light resistance.

[0016] And if adopt the polyester of patent document 3~5, although can carry out dyeing under normal pressure, and also improved light fastness,,,,, so exist the difference between the polyester of different batches because usually adopting batch mode to manufacture. Increased variation in physical properties, significant deterioration in spinning operability, and lower quality of the obtained fiber

[0017] However, the normal pressure cationic dyeable polyester described in Patent Document 6 has uniform physical properties, but the light fastness to dark colors is still not satisfactory.

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