IL24184A - Process for dyeing shaped articles of polyvinyl chloride - Google Patents

Description

shaped of polyvinyl chloride The present invention relates a process dyeing polyvinyl chloride of a syndiotactic index and more particularly relates to a process for dyeing tubes or other extruded bodies of polyvinyl chloride of a high syndiotactic Index The term chloride of a high syndiotactic as used in this description and in the relates to polyvinyl chloride homopolymers prepared at a temperature from with an intrinsic iscosity higher and with a syndiotactic index higher than o to copolymers or polymers mixtures of such characteristics containing at least by weight of vinyl units in the polymer The syndiotactic index is defined by the absorption ratio by the bands 655 and 692 as described by page I chloride with a high syndiotactic has only small affinity with dyes and do not easily absorb aqueous Consequently it very difficult to obtain satisfactory especially when the polymers are in the form of strongly orientated present invention consists in a process for dyeing polyvinyl chloride of a high syndiotactic as herein in which said polyvinyl chloride is dyed with a dye dissolved or dispersed in water either at a temperature higher than and at a pressure higher than or at least the boiling temperature in the presence of a swelling The term as used herein is understood to embrace not only ooloured in themselves and which have also an affinity textile as vat dyes which can be applied either as a dispersion in the reduced form or in the unreduced the dispersed insoluble or of sulphuric esters of the type used for cellulose but also substances must turned the uffs on the textile materials such as substances used in the polyvinyl chloride with a be dyed in the form of films tubes or similar formed or may be dyed in the form of unwoven o Suitable dyes are for the dispersed dyes the Foron or the dyes already the polyvinyl chloride dyeing according to the invention can be carried out also in the presence to a Suitable swelling agents these known per for aromatic include phenols and amines as aniline and aniline ca acids salicylic acid and methacrylio acid example and alcohols example ketones acetophenone and nitrlles 24184 2 4 and swelling agents such phosphate and Some of these compounds are known under the commercial names of of of or of The swelling may conveniently be dissolved or dispersed in water or i an aqueous medium and this solution or dispersion is used a liquid for a preliminary preferably at a high temperature for example at Xf the swelling agen can be incorporated in the The swelling in are advantageously dissolved instance by means of a salt of fatty alcohol sulphate of a long The invention will be more particularly described with reference to the following which show how excellent results may be obtained in the dyeing of shaped articles of polyvinyl chloride with a hig very dark which have a great and fastness to of staple fibres of with a high s index were introduced into dyeing apparatus which was kept pressure and had a holding capacity of about 20 staples were scoured at for with solution containin of a detergent example ltrawo 1099 of and of sodium and were the washed with An aqueous solution containing of a dispersing agent of 30 of a Foron blue dye of Sandoz was then added to the a the pressure of the dyeing apparatus was maintained at about the bath temperature was raised to over ers of an o The temperature was then kept at 120 G 90 and the apparatus thereafte the staple fibres were washed with cold and treated with an antistatic of with respeot to the for 20 minutes The apparatus was then The coloured staple fibre thus obtained was and dried at about in The staple fibres had a deep blue colour and the following 5 sunlight fastness to cleaning 4 fastness to ness was determined according to the by using the Sunlight fastness was determined according to the standards by the scal of blue The fastness to and to the washing in 4184 2 6 water at was detenained according to the To bath made up 2 of dispersing agent of as 30 scarlet dye in a finely subdivided were added of staple fibres of polyvinyl chloride a high previously scoured as in temperature was brought up to over threequarters of an this temperature maintained fo 90 bath was finally the staple was washed in and an antistatic was added ΝΔ of were then oentrifuged and dried The fibre had a deep scarlet oolour and the ollowing crookfastness 5 sunlight fastness fastness to dry cleanin 4 fastness to water washing at insufficientOCRQuality

Claims (1)

1. 7 process dyeing shaped articles of polyvinyl chloride of a high index as herein i polyvinyl chloride is dyed with a dye dissolved or in water either at temperature higher than and at a pressure higher than or a the boiling temperature in presence of a A process according to 1 in which the polyvinyl chloride polymers of a high are the form of films or A process according to Claim 1 in which the vinyl chloride polymers with a high syndiotactic index are in the form of woven or unwoven fabrics or garmenta made such A process as claimed in an one preceding claim i which the swelling agent is a swelling agent of the type for aromatic A prooess as claimed any one preceding claim in which the polyvinyl chloride polymer is contacted with the swelling dissolved or dispersed in water or an aqueous medium prior to boilin the dye solution or A prooess as claimed in Claim which the preliminary contacting with the swelling agent is effected at A process as claimed in any one of Claims 1 to 4 8 A process as claimed in Claim 1 and substantially as herein described with reference to either Shaped articles of polyvinyl chloride either as film or or as woven or fabric made o garments made suc dyed by the process as claimed in any one preoeding the Applicants insufficientOCRQuality