GB2186004A - Reducing photoyellowing - Google Patents

Reducing photoyellowing Download PDF

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Publication number
GB2186004A
GB2186004A GB08602313A GB8602313A GB2186004A GB 2186004 A GB2186004 A GB 2186004A GB 08602313 A GB08602313 A GB 08602313A GB 8602313 A GB8602313 A GB 8602313A GB 2186004 A GB2186004 A GB 2186004A
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GB
United Kingdom
Prior art keywords
wool
photoyellowing
irradiation
reducing
hours
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08602313A
Other versions
GB8602313D0 (en
Inventor
David Malcolm Lewis
Stuart Kenneth Russell Jones
Professor Robert Step Davidson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wool Development International Ltd
Original Assignee
Wool Development International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wool Development International Ltd filed Critical Wool Development International Ltd
Priority to GB08602313A priority Critical patent/GB2186004A/en
Publication of GB8602313D0 publication Critical patent/GB8602313D0/en
Publication of GB2186004A publication Critical patent/GB2186004A/en
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/12—Aldehydes; Ketones
    • D06M13/127—Mono-aldehydes, e.g. formaldehyde; Monoketones
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Coloring (AREA)

Abstract

A method of reducing photo yellowing in substrates susceptible to photo yellowing, for example cellulosic materials such as wood or paper and textile fibres such as wool, comprises treating the substrate with a solution of zinc sulphoxylate formaldehyde and irradiating the treated material in the wet state with ultraviolet light. The amount of zinc sulphoxylate formaldehyde used is preferably from 0.5% to 10% by weight and the ultraviolet light is preferably of a wave length of 350 nanometers, the irradiation being conducted for 2 to 48 hours.

Description

SPECIFICATION Reduction of photoyellowing This invention relates two a method of reducing photoyellowing particularly, but not exclusively, in textile materials.
Many materials darken or'yellow'when exposed to light. Examples include materials such as wood or cellulose which contain ligneum and textile materials such as wool. Wool is often treated with fluorescent whitening agents two improve its whiteness but this can actually increase its susceptibility to photoyellowing.
Certain compounds, for example thiourea formaldehyde, thioglycholic acid orthiourea dioxide have been shown to exhibit a certain amount of protective effect on fluorescently whitened wool, but the effect is not durable to washing.
The invention seeks to provide a method of reducing photoyellowing improved in the above respects.
According to the present invention there is provided a method of reducing photoyellowing in substrates susceptible to photoyellowing which comprisestreating the substrate with a solution of zinc sulphoxylate formaldehyde and irradiating the treated material in the wet state with ultra-violet light.
The above process has been found to give durable improvements in photoyellowing performance on a variety of substrates in particular on textile materials such as wool. Furthermore the improvement is durable to washing.
Preferably the amount of zinc su I phoxylate formaldehyde is from 0.5 to 10% by weight and a 2% solution has been found to give optimum results. The ultra-violet light is preferably of wave lengths about 350 nanometers and the period of irradiation is from 2 to 48 hours, typically 24 hours.
As well as giving improved effects on textile materials such as wool, the process of the invention is equally applicable to cellulosic materials such as wood, paper, jute and the like. Thus white woods and white paper can be protected against yellowing.
The invention will be illustrated further in the following examples.
Wool samples were treated with a 2% solution of zincsulphoxylateformaidehyde which is available com mercially as'Blankit D' from BASF as an 80% pure product with the remaining 20% being stabilisers. The samples were irradiated at 350 nanometers for 24 hours whilst being maintained in the wet state. After irradiation the wool samples were thoroughly rinsed in running cold waterfortwo minutes and then dried.
The samples were then further exposed to lightto bring about photoyellowing and were assessed foryellowness using the Zeiss RFC3 reflectance spectrophotameterto measure the ASTM yellowness index (Yl). This is calculated using the formula: Yl (%) = 100(X-Y) z where X, Y and Z are reflectancevalues obtained using tristimulusfilters proposed by the CIE (which roughly correspond to amber, blue and green). The higherthe yellowness index the greater the yellowness ofthe fabric; a difference of 1 yellowness index unit is visually discernible.
The results are shown in table 1. The photoyellowing test is carried out in similar manner two thewet irradiation pretreatment. Samples are supported on a glass plate, and half the sample is covered with an aluminium foil while the other half is irradiated in a wet condition using distilled water. Wet irradiation (at 350 nanometersfor24 hours) is preferred to dry irradiation sincethe photoyellowing processes are speeded up.
The change in yellowness index is shown in the column in table 1 markedYI and this table shows that inthe case of fluorescently whitened wools very significant reductions in photoyellowing are achieved by the process of the invention.
Thefluorescently whitened wool employed in table 1 was rated 2-3 on the 'blue scale'for assessing light fastness. The same samples having been treated in accordance with the invention are found to have a light fastness of 4-5 while maintaining the original whiteness. Thus the light fastness ofthefluorescenttreatment is significantly improved with the process ofthe invention.
I Comparíson of the effects ofirradiation in BlankitDsolution upon (il untreated, (iil bleachedand (iiil fluores- cently whitened wool Wool sample y.l Yl aftersubsequent A VI on photo yellowing photo yellowing test i) Untreated wool (notirradiated) 29.9 34.2 4.3 Untreated wool, irradiated in 2% BlankitDsolution 14.6 20.4 5.8 Untreated wool, irradiated in 2% Blankit D solution containing 100g/litre urea 12.6 16.5 3.9 ii) Peroxide Bleached wool* (notirradiated) 14.2 27.8 13.6 Bleached wool, irradiated in 2% Blankit D solution 14.9 27.9 13.0 Bleached wool, Irradiated in 2% Blankit D solution containing 100g/litre urea 11.8 23.1 11.3 iii) Fluorescentlywhitened* wool (Uvitex NFW) (notirradiated) 4.2 28.1 23.9 Fluorescentlywhitened wool irradiated in 2% BlankitDsolution 5.4 13.3 7.9 Fluorescentlywhitened wool, irradiated in 2% Blankit D solution containing 100g/litre urea 7.8 22.2 14.4 * Peroxide bleaching was carried out using the following conditions: 5 gIl Tubatex PC (silicate stabilizer), 28g/l hydrogen peroxide (100 vol.) ph 8 with formic acid. Liquor Ratio 30/1. Run 40'for 5 hours.
*FWA was applied: 6g/l Blankit IN (stabilized hydrosu I phite - N a2S204) 1% o.w.f. citric acid, 1% o.w.f. Uvitex NFW. Raise bath to 80 C, run 1 hour at 80"C. Rinse well.

Claims (10)

1. A method of reducing photo yellowing in substrates susceptible to photo yellowing which comprises treating the substrate with a solution of zinc sulphoxylate formaldehyde and irradiating the treated material in the wet state with ultra violet light.
2. A method as claimed in claim 1 in which the substrate is a textile material.
3. A method as claimed in claim 2 in which the textile is a keratinousfibre.
4. A method as claimed in claim 3 in which the keratious fibre iswool.
5. A method as claimed in any one of claims 1 to 4 in which the amount of zincsulphoxylateformaldehyde isfrom0.5%to 1 O% by weight
6. A method as claimed in claim 5 in which the amount of zine sulphoxylateformaldehyde is about2%.
7. A method as claimed in any of claims 1 to 6 in which the ultra violet light is of a wave length of about350 nanometers.
8. A method as claimed in any of claims 1 to 7 in which the period of irradiation is from 2 to 48 hours.
9. A method as claimed in claim 8 in which the period of irradiation is about 24 hours.
10. A method of reducing photo yellowing in substrates susceptible to photo yellowing as substantially hereinbefore described with reference to and as illustrated in the foregoing examples.
GB08602313A 1986-01-30 1986-01-30 Reducing photoyellowing Withdrawn GB2186004A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08602313A GB2186004A (en) 1986-01-30 1986-01-30 Reducing photoyellowing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08602313A GB2186004A (en) 1986-01-30 1986-01-30 Reducing photoyellowing

Publications (2)

Publication Number Publication Date
GB8602313D0 GB8602313D0 (en) 1986-03-05
GB2186004A true GB2186004A (en) 1987-08-05

Family

ID=10592243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08602313A Withdrawn GB2186004A (en) 1986-01-30 1986-01-30 Reducing photoyellowing

Country Status (1)

Country Link
GB (1) GB2186004A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005357A1 (en) * 1994-08-08 1996-02-22 Wool Research Organisation Of New Zealand (Inc) A method of preventing photobleaching of wool and/or other natural fibres

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB807455A (en) * 1955-11-16 1959-01-14 Dow Chemical Co Method for stabilizing polyvinyl pyrrolidone and compositions thereby obtained

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB807455A (en) * 1955-11-16 1959-01-14 Dow Chemical Co Method for stabilizing polyvinyl pyrrolidone and compositions thereby obtained

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996005357A1 (en) * 1994-08-08 1996-02-22 Wool Research Organisation Of New Zealand (Inc) A method of preventing photobleaching of wool and/or other natural fibres
AU684991B2 (en) * 1994-08-08 1998-01-08 Wool Research Organisation Of New Zealand Inc. A method of preventing photobleaching of wool and/or other natural fibres

Also Published As

Publication number Publication date
GB8602313D0 (en) 1986-03-05

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