Modifizierte Polyester

摘要

1,127,925. Sulphonated block copolyesters. IMPERIAL CHEMICAL INDUSTRIES Ltd. 26 Nov., 1965 [7 Dec., 1964], No. 49715/64. Heading C3R. [Also in Division D1] A copolyester containing at least 5 wt. per cent of sulphur in the form of sulphonic acid or sulphonate salt groups consists of alternating blocks A and B, where blocks A derive from sulphur-free dicarboxylic acids and glycols, and blocks B consist of essentially linear chains containing sulphonated dicarboxylic acid and glycol residues; it is prepared by melt blending a homopolymer providing blocks A with an unsaturated homopolymer, to give a copolyester containing 20-50 wt. per cent of blocks A and 80-50 wt. per cent of blocks B, and sulphonating the product with SO 2 , sulphurous acid or a metal sulphite. The copolymer may be used for treating shaped articles, e.g. fabrics, composed of a synthetic crystalline polyester having units identical with those of the blocks A of the copolyester of the invention. The blocks A may suitably be polyethylene terephthalate, optionally containing minor amounts of residues of adipic, sebacic, isophthalic, or sulphoisophthalic acids or diethylene glycol or p-oxybenzoic acid, or they may be polytetramethylene terephthalate, polydimethylenecyclohexane terephthalate, polyethylene naphthalene-2: 6- dicarboxylate, polyethylene diphenoxyethane- 4: 41-dicarboxylate or polyethylene oxybenzoate. Suitable unsaturated polyesters may be prepared from maleic, fumaric, itaconic, citraconic or aconitic acids and ethylene, tetramethylene or diethylene glycols. The sulphonation is preferably carried out using aqueous sulphurous acid or metal sulphite, e.g. sodium metabisulphite, at 50-120‹ C., to give an aqueous dispersion of the product. This dispersion may then be applied directly, e.g. by padding, to the shaped article, which is then dried and heated above 60‹ C., or the dispersion may be applied by dyeing processes. The unsaturated block copolymer may be applied to the article before the sulphonation step. To the dispersion for treating shaped articles may be added conventional optical brighteners and antistatic agents. In Examples polyethylene terephthalate is melt blended with polyethylene maleate or citraconate or itaconate then treated with sodium hydrogen sulphite or sodium metabisulphite or (in Example 27) benzyltrimethylammonium sulphite, before or after the blend is applied in aqueous dispersion to a polyethylene terephthalate taffeta or (in Example 3) a polyethylene terephthalate/cotton fabric. At the melt stage there may be added (in Examples 10-17) 2: 4 - dimethyl - 6 - α - methylcyclohexyl-phenol antioxidant, (in Example 26) 2: 5- di - t. - butyl - benzoxazol - 2 - yl - thiophene optical brightener, or (in Example 27) N-stearyldiethanolamine antistatic agent. To the fabric-treating composition may be added antistatic agents and diphenyl (Examples 20-21) or optical brighteners and o-phenyl phenol (Examples 22-25).