3896-11-5

Basic information

• Product Name: Bumetrizole
• Synonyms: 2-T-BUTYL-6-(5-CHLORO-2 H-BENZOTRIAZOL-2-YL)-4-METHYLPHENOL;BUMETRIZOLE;LABOTEST-BB LT00138024;TINUVIN 326;ULTRA-VIOLET ABSORBER UV-326;ULTRAVIOLET ABSORBENT UV-326;2-(5-chloro-2h-benzotriazol-2-yl)-6-(1,1-dimethylethyl)-4-methyl-pheno;2-tert-butyl-6-(5-chloro-2h-benzotriazol-2-yl)-4-
• CAS NO: 3896-11-5
• Molecular Formula: C₁₇H₁₈ClN₃O
• Molecular Weight: 315.8
• EINECS: 223-445-4
• Product Categories: Industrial/Fine Chemicals;Polymer Additives;Polymer Science;Stabilizers;Polymer Additives;Polymer Science
• Mol File: 3896-11-5.mol

Chemical Properties

• Melting Point: 144-147 °C(lit.)
• Boiling Point: 460.4 °C at 760 mmHg
• Flash Point: 232.3 °C
• Appearance: powder
• Density: 1.26 g/cm³
• Vapor Pressure: 4.24E-09mmHg at 25°C
• Refractive Index: 1.628
• Storage Temp.: Sealed in dry,Room Temperature
• Solubility: Chloroform (Slightly), Ethyl Acetate (Slightly), Methanol (Slightly)
• PKA: 9.31±0.48(Predicted)
• Water Solubility: 4μg/L at 20℃
• CAS DataBase Reference: Bumetrizole(CAS DataBase Reference)
• NIST Chemistry Reference: Bumetrizole(3896-11-5)
• EPA Substance Registry System: Bumetrizole(3896-11-5)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38-53
• Safety Statements: 26-36-61
• WGK Germany: 1
• Hazardous Substances Data: 3896-11-5(Hazardous Substances Data)

Usage

Uses

Used in the Textile Industry:
Bumetrizole is used as an intermediate reactant for the synthesis of UV light absorbers for polyester fibers. It helps protect the fibers from the damaging effects of UV radiation, thereby enhancing their durability and longevity.
Used in the Cosmetics and Personal Care Industry:
UV-326, or Bumetrizole, is used as a UV light filter in cosmetics and sunscreens. It helps protect the skin from the harmful effects of the sun's UV rays, reducing the risk of sunburn and skin damage.
Used in the Building Materials and Automotive Industry:
Bumetrizole can also be used as a corrosion inhibitor for the protection of building materials and automobiles. It helps prevent the degradation of these materials caused by exposure to sunlight and other environmental factors.
Used in the Plastics Industry:
UV Absorber 326, or Bumetrizole, is especially suited for polyolefins and cold-cured polyesters. It provides light stability to these materials, preventing them from yellowing, cracking, or becoming brittle due to prolonged exposure to sunlight.

Features/Benefits

UV Absorber 326 has a wide range of indirect food approvals in polyolefins. It has a low volatility at high temperatures and high resistance to thermal degradation and can therefore be used without significant loss or decomposition in the polyolefin compounding and molding processes. In the use for the UV protection of polyester resins, TINUVIN 326 does not form colored complexes with the metallic salts used for the curing process of these resins.

Handling & Safety

In accordance with good industrial practice, handle with care and avoid unnecessary personal contact. Avoid continuous or repetitive breathing of dust. Use only with adequate ventilation. Prevent contamination of the environment. Avoid dust formation and ignition sources. For more detailed information please refer to the material safety data sheet.

Originator

Bumetrizole,Onbio Inc.

Manufacturing Process

To a 2000 ml 3-necked, round-bottomed flask equipped with an agitator, reflux condenser, nitrogen inlet and thermometer were charged 140.5 g of 2'- hydroxy-3'-t-butyl-5'-methyl-5-chloro-2-nitroazobenzene, 119 g of isopropanol and 80 g of Amsco mineral spirits. A stream of nitrogen was introduced over the surface of the contents of the flask and the nitrogen atmosphere was then maintained throughout the remainder of the reduction process. 13.7 g of 50% aqueous sodium hydroxide solution and 222 g of water were added and the temperature of the contents of the flask were adjusted to 55°C. The ratio of the moles of alkali to moles of o-nitroazobenzene intermediate used was is 0.848/1. 104 g of zinc dust was added in 5 portions over a 2 hours period with the temperature of the flask being held at 55-60°C with some slight external cooling. The total concentration of iron impurities from all reactants less than 150 ppm based on zinc used. After all the zinc was added, the temperature was raised to 60°C and held at this temperature until a spot test indicated no more o-nitroazobenzene intermediate was present. The temperature was then raised to 65°C and held there for 4 to 5 hours or until TLC analysis indicated that no more of the N-oxy-intermediate was present. 62.6 g of anhydrous sodium sulfate and 35.6 g of water were then added, the batch was heated to 70°C and stirred for 15 min. The material was then allowed to stand and separate into three liquid phases plus unreacted zinc dust. The top two layers containing the desired product were transferred to another flask. The remaining aqueous zinc slurry was washed at 65-70°C with three successive 16 g portions of Amsco mineral spirits: isopropanol 50:50. The combined product layers and wash liquids were then washed once at 70°C with an aqueous hydrochloric acid solution made from 130 g of water and 40 g of 32% hydrochloric acid to remove cleavage amine by-products. A second and third wash followed at 70°C with aqueous hydrochloric acid solutions made each from 65 g of water and 20 g of 32% hydrochloric acid. The last wash was essentially colorless. 14 g of 32% hydrochloric acid and 220 g of isopropanol were added to the solution of the product. The batch was allowed to crystallize slowly. The solid product form was filtered and washed with isopropanol at 0°C to give 110 g of 5-chloro-2-(2-hydroxy-3-t-butyl-5- methylphenyl)-2H-benzotriazole with a melting point of 140-141°C.

Therapeutic Function

Sunscreen agent

Flammability and Explosibility

Notclassified

InChI:InChI=1/C17H18ClN3O/c1-10-7-12(17(2,3)4)16(22)15(8-10)21-19-13-6-5-11(18)9-14(13)20-21/h5-9,22H,1-4H3

Synthetic route

2-<(4-Chloro-2-nitrophenyl)azo>-6-(1,1-dimethylethyl)-4-methylphenol (22617-04-5) → 2-tert-Butyl-6-(6-chloro-1-oxy-benzotriazol-2-yl)-4-methyl-phenol (56750-11-9) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide; thiourea S,S-dioxide In water; isopropyl alcohol for 3h; Heating;	A 0.3% B 98%

C17H18ClN3O2 → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
In isopropyl alcohol at 80 - 82℃; for 4h;	97.8%

2-nitro-4-chloro-2'-hydroxy-3'-tert-butyl-5'-methylazobenzene (22617-04-5) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With borane-ammonia complex In toluene at 50℃; for 5h;	97.4%
Multi-step reaction with 2 steps 1: 77 percent / glucose, 2N NaOH / ethanol / 1 h / Heating 2: 84 percent / Zn, 2N NaOH / ethanol / 1 h / Ambient temperature View Scheme
Multi-step reaction with 2 steps 1: sodium hydroxide; hydrazine hydrate / 5,5-dimethyl-1,3-cyclohexadiene; acetone 2: hydrogen; platinum on activated charcoal / 50 - 75 °C / 3750.38 - 6000.6 Torr / Autoclave View Scheme
With hydrazine hydrate; sodium hydroxide In toluene at 60℃; for 8h; Temperature;
Multi-step reaction with 2 steps 1: 2,3-Dichloro-1,4-naphthoquinone; sodium hydroxide / isopropyl alcohol / 2 h / 40 - 45 °C / Inert atmosphere 2: isopropyl alcohol / 4 h / 80 - 82 °C View Scheme

C17H20ClN3O2 → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium phosphite; hydrogen; sodium hydroxide at 80℃; under 11251.1 Torr; for 8h; Reagent/catalyst; Pressure; Temperature; Autoclave;	94.3%

C17H18ClN3O2 → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With platinum on activated charcoal; hydrogen at 50 - 75℃; under 3750.38 - 6000.6 Torr; Autoclave;	92.1%

2-Nitro-4-chloro-2'-hydroxy-3'-tert-butyl-5'-methyl-azobenzene → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide; zinc In water at 90℃; for 0.5h;	92%

2-<(4-Chloro-2-nitrophenyl)azo>-6-(1,1-dimethylethyl)-4-methylphenol (22617-04-5) → 2-(2-Amino-4-chloro-phenylazo)-6-tert-butyl-4-methyl-phenol (109969-10-0) + 2-tert-Butyl-6-(6-chloro-1-oxy-benzotriazol-2-yl)-4-methyl-phenol (56750-11-9) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide; thiourea S,S-dioxide In methanol; water for 3h; Product distribution; Heating; other solvents, various molar equivalents of thiourea S,S-dioxide and NaOH;	A 3% B 2% C 91%
With sodium hydroxide; thiourea S,S-dioxide In water; isopropyl alcohol for 3h; Heating;	A 2% B 40% C 54%

2,3-Dichloro-1,4-naphthoquinone (117-80-6) + 2-Nitro-4-chloro-2'-hydroxy-3'-tert-butyl-5'-methyl-azobenzene + D-glucose (50-99-7) → 2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole-N-oxide (94102-12-2) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide In methanol	A n/a B 89.5%

2-tert-Butyl-6-(6-chloro-1-oxy-benzotriazol-2-yl)-4-methyl-phenol (56750-11-9) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide; zinc In ethanol for 1h; Ambient temperature;	84%

2-Nitro-4-chloro-2'-hydroxy-3'-tert-butyl-5'-methyl-azobenzene + Cu-II-acetylacetonate + 2-(2-Hydroxy-5-methylphenyl)benzotriazole (2440-22-4) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
	70%

2-tert-Butyl-4-methylphenol (2409-55-4) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
Multi-step reaction with 3 steps 1: 2.) 1N HCl, sodium lauryl sulfate / 1.) diazotation, 2.) 45 deg C, 6 h 2: 77 percent / glucose, 2N NaOH / ethanol / 1 h / Heating 3: 84 percent / Zn, 2N NaOH / ethanol / 1 h / Ambient temperature View Scheme

4-Chloro-2-nitroaniline (89-63-4) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
Multi-step reaction with 3 steps 1: 2.) 1N HCl, sodium lauryl sulfate / 1.) diazotation, 2.) 45 deg C, 6 h 2: 77 percent / glucose, 2N NaOH / ethanol / 1 h / Heating 3: 84 percent / Zn, 2N NaOH / ethanol / 1 h / Ambient temperature View Scheme

formaldehyd (50-00-0) + 2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole-N-oxide (94102-12-2) + ethanol (64-17-5) + anthracen-9(10H)-one (90-44-8) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With potassium hydroxide In water
With potassium hydroxide In water

2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole-N-oxide (94102-12-2) + 9-fluorenone (486-25-9) → 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5)

Conditions	Yield
With sodium hydroxide; paraformaldehyde In methanol; water
With sodium hydroxide; paraformaldehyde In methanol; water

2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 5-chloro-2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole (22396-48-1)

Conditions	Yield
With aluminium trichloride; nitromethane In toluene for 7h; Heating;	79%
Stage #1: 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole With aluminum (III) chloride In toluene at 80℃; for 0.5h; Stage #2: With water In toluene

Hf(OiPr)4·HOiPr (1070655-38-7) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → [(2-tertbutyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol)2Hf(OiPr)2]

Conditions	Yield
In hexane at 30℃; for 12h; Inert atmosphere;	70%

tetra(isopropoxy)hafnium isopropanol (1070655-38-7) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → [(2-tertbutyl-6-(5-chloro-2H-benzotriazol-2-yl)-4-methylphenol)2Hf(OiPr)2]

Conditions	Yield
In hexane at 30℃; for 12h; Inert atmosphere;	70%

copper(II) acetate monohydrate (6046-93-1) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → C34H34Cl2CuN6O2 (1472063-82-3, 1472063-84-5, 1472063-85-6)

Conditions	Yield
In ethanol for 24h; Reflux;	60%

2,2'-iminobis[ethanol] (111-42-2) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 2-(2'-Hydroxy-3'-tert-butyl-5'-(bis(2-hydroxyethyl)aminomethyl)phenyl)-5-chlorobenzotriazole (368867-95-2)

Conditions	Yield
In acetone

(E)-3,3'-(diazene-1,2-diyl)bis(2-methylpropanenitrile) (764-28-3) + 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 2-(2'-Hydroxy-3'-tert-butyl-5'-bromomethylphenyl)-5-chlorobenzotriazole

Conditions	Yield
With azobisisobutyronitrile; nitrogen In tetrachloromethane; bromine
With azobisisobutyronitrile; nitrogen In tetrachloromethane; bromine

2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 2-(5-chloro-2H-benzotriazol-2-yl)-6-chloromethyl-4-methylphenol (1314118-46-1)

Conditions	Yield
Multi-step reaction with 2 steps 1: aluminum (III) chloride / toluene / 0.5 h / 80 °C 2: hydrogenchloride; zinc(II) chloride; acetic acid / 12 h / 90 °C View Scheme

2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 2-(5-chlorobenzotriazol-2-yl)-6-(2-ethylhexyloxymethyl)-4-methylphenol (1314118-47-2)

Conditions	Yield
Multi-step reaction with 3 steps 1: aluminum (III) chloride / toluene / 0.5 h / 80 °C 2: hydrogenchloride; zinc(II) chloride; acetic acid / 12 h / 90 °C 3: sodium carbonate / acetone / 3 h / 80 °C View Scheme

2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → 2-(5-chloro-2H-benzotriazol-2-yl)-4-methyl-6-(3-methylbutoxymethyl)phenol (1314118-48-3)

Conditions	Yield
Multi-step reaction with 3 steps 1: aluminum (III) chloride / toluene / 0.5 h / 80 °C 2: hydrogenchloride; zinc(II) chloride; acetic acid / 12 h / 90 °C 3: sodium carbonate / acetone / 2 h / 80 °C View Scheme

2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-2H-5-chlorobenzotriazole (3896-11-5) → deltametrin (52918-63-5)

Upstream product

• 56750-11-9 2-tert-Butyl-6-(6-chloro-1-oxy-benzotriazol-2-yl)-4-methyl-phenol 
• 2409-55-4 2-tert-Butyl-4-methylphenol 
• 22617-04-5 2-nitro-4-chloro-2'-hydroxy-3'-tert-butyl-5'-methylazobenzene 
• 50-00-0 formaldehyd 
• 94102-12-2 2-(2-hydroxy-3-t-butyl-5-methylphenyl)-5-chlorobenzotriazole-N-oxide 
• 64-17-5 ethanol 
• 90-44-8 anthracen-9(10H)-one 
• 2440-22-4 2-(2-Hydroxy-5-methylphenyl)benzotriazole 
• 117-80-6 2,3-Dichloro-1,4-naphthoquinone 
• 50-99-7 D-glucose 
• 486-25-9 9-fluorenone 
• 89-63-4 4-Chloro-2-nitroaniline 
• 22617-04-5 2-<(4-Chloro-2-nitrophenyl)azo>-6-(1,1-dimethylethyl)-4-methylphenol 

Downstream Products

• 23939-33-5 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-2H-benzotriazole 
• 22396-48-1 5-chloro-2-(2-hydroxy-5-methylphenyl)-2H-benzotriazole 
• 368867-95-2 2-(2'-Hydroxy-3'-tert-butyl-5'-(bis(2-hydroxyethyl)aminomethyl)phenyl)-5-chlorobenzotriazole 
• 1314118-46-1 2-(5-chloro-2H-benzotriazol-2-yl)-6-chloromethyl-4-methylphenol 
• 1314118-47-2 2-(5-chlorobenzotriazol-2-yl)-6-(2-ethylhexyloxymethyl)-4-methylphenol 
• 1314118-48-3 2-(5-chloro-2H-benzotriazol-2-yl)-4-methyl-6-(3-methylbutoxymethyl)phenol 
• 52918-63-5 deltametrin 

Relevant articles and documents

Preparation method of benzotriazole ultraviolet light absorber

The invention relates to a preparation method of a benzotriazole ultraviolet absorbent. The method comprises the following steps: under the action of a magnesium oxide supported metal catalyst, carrying out transfer hydrogenation reaction on an azo intermediate shown in a formula I and a hydrogen donor to obtain a target product shown in a formula III. The method provided by the invention is small in catalyst dosage, the raw material conversion rate can reach 100%, and the target product selectivity is 90% or above.

Method to prepare benzotriazole ultraviolet-absorbing agent via catalytic hydrogen process

The invention relates to a method to prepare a benzotriazole ultraviolet-absorbing agent via a catalytic hydrogen transfer process. The method includes: before hydrogen transfer reaction, refining thereaction material an azobenzene compound, fully removing impurities that disturb the hydrogen transfer reaction to obtain purity of 99% and above, and performing hydrogen transfer reaction. The refining of the material ensures smoothness for the subsequent hydrogen transfer reaction, and the benzotriazole ultraviolet-absorbing agent of high yield and high purity can be obtained; in addition, themethod has significantly reduced usage of quinone catalysts, is green and low in cost and is suitable for industrial production routes.

Preparation method of ultraviolet absorbent containing chlorobenzotriazole

The invention relates to a preparation method of an ultraviolet absorbent containing chlorobenzotriazole. Azobenzene, sodium hydroxide and toluene are stirred and mixed, the temperature is controlled to 60-80 DEG C, water and hydrazine are dropwise added at a constant speed, heat preservation reaction is performed after the completion of dropping, hydrochloric acid is added to perform neutralization to reach the pH of 6-7 after completion of hydrazine reduction, washing is performed, and an oil phase, namely nitrogen oxide, is obtained; the nitrogen oxide solution, alkali, a framework nickel catalyst and a catalyst promoter sodium phosphite are put into an autoclave, and hydrogen is led to perform constant-pressure constant-temperature reaction after nitrogen displacement; after reaction is completed, reaction liquid filtration and washing are performed, an organic phase evaporated solvent is obtained, and recrystallization, filtration and drying are conducted on the methanol and toluene mixed solvent to obtain the ultraviolet absorbent containing chlorobenzotriazole. Compared with an existing synthetic method, the preparation method has the advantages of being good in reaction selectivity, inhibiting a dechlorination phenomenon in the hydrogenation process, producing few by-products and the like and meanwhile does not produce wastewater containing zinc and aluminum, subsequent processing is simple, and the 'three wastes' problem produced in the secondary reduction process is solved.

Preparation method of benzotriazole light stabilizer

The invention discloses a preparation method of a benzotriazole ultraviolet light stabilizer. The method comprises the following steps: adding an azo dye intermediate represented by formula I to hydrazine hydrate, carrying out reduction to form an intermediate nitrogen oxide represented by formula II, and reducing the intermediate nitrogen oxide represented by formula II with hydrogen to prepare the benzotriazole ultraviolet light stabilizer represented by formula III, wherein the formula I, the formula II and the formula III are respectively shown in the description, and R in the formulas is C(CH3)3 or CH3. The preparation method allows wastewater generated in the invention to be environmentally-friendly.

Preparation of 2-aryl-2H-benzotriazoles by zinc-mediated reductive cyclization of o-nitrophenylazophenols in aqueous media without the use of organic solvents

Zinc powder-mediated reductive cyclization of o-nitrophenylazophenols in alkaline solution affords the corresponding 2-aryl-2H-benzotriazoles in high yields under mild reaction conditions. No organic solvents are used in the reaction and only minimal amounts in the work-up.

METHOD FOR PREPARING 2-(2-HYRDROXYPHENYL)-2H-BENZOTRIAZOLE

This invention provides a method for preparing 2-(2-hydroxyphenyl)-2H-benzotriazole of formula (I) below, consisting of steps of a) performing a first reduction in which hydrazine hydrate is added to a compound of formula (II) below with or without a phase transition catalyst in the presence of solvents which include a nonpolar solvent, water, and an alkaline compound, thereby preparing a compound of formula (III) below, and b) performing a second reduction in which water is added to the compound of formula (III) prepared in step a), and then zinc powder and sulfuric acid are added thereto with or without the phase transition catalyst, wherein, X is halogen or hydrogen, R is hydrogen, C1-C12 alkyl, C5-C8 cycloalkyl, phenyl, or phenyl-C1-C4 alkyl; and R' is C1-C12 alkyl, C5-C8 cycloalkyl, phenyl, or phenyl-C1-C4 alkyl

4-Formyl amino-n-methylpiperidine derivatives, the use thereof as stabilisers and organic material stabilised therewith

The present invention relates to 4-formylamino-N-methylpiperidine derivatives of the formula (I) where the variables are as defined in the Description, to a process for preparing these piperidine derivatives, to the use of these piperidine derivatives of the invention, or prepared according to the invention, for stabilizing organic material, in particular for stabilizing plastics or coating materials, and also to the use of these piperidine derivatives of the invention, or prepared according to the invention, as light stabilizers or stabilizers for wood surfaces. The present invention further relates to stabilized organic material which comprises these piperidine derivatives of the invention or prepared according to the invention.

2-(2′-hydroxyphenyl)benzotriazoles used as U.V. stabilizers

2-(2′-hydroxyphenyl)benzotriazoles having general formula (I). The above 2-(2′-hydroxyphenyl)benzotriazoles are useful as light stabilizers for organic polymers.

2-(2′-hydroxyphenyl) benzotriazoles containing a 2,4-imidazolidinedione group and process for their preparation

2-(2′-hydroxyphenyl)benzotriazoles having general formula (I). The above 2-(2′-hydroyzphenyl)benzotriazoles having general formula (I) are useful as heat, oxygen and light stabilizers for organic polymers. In particular they are useful as UV stabilizers for organic polymers.

Liposomogenic UV absorbers

PCT No. PCT/EP96/00959 Sec. 371 Date Sep. 15, 1997 Sec. 102(e) Date Sep. 15, 1997 PCT Filed Mar. 7, 1996 PCT Pub. No. WO96/29302 PCT Pub. Date Sep. 26, 1996There are described liposomogenic UV absorbers, comprising a hydrophilic head group (=Z), a spacer (=W), a UV chromophore (Q) having an absorption in the range from 285 to 400 nm and at least one hydrophobic tail group (=A) of the formula (1), in which A1 and A2, independently of one another, are a hydrophobic radical, Q is a UV chromophore, W is an organic radical, Z1 and Z2, independently of one another, are a hydrophilic radical, n1 and n2, independently of one another, are a number from 0 to 4, n1=n2=0 not being additionally included, p is 1 or 2, q is a number from 0 to 3, r1 is 1 or 2, r2 is 0 or 1, and s1 is a number from 1 to 3. The liposomogenic UV absorbers according to the invention are preferably used as sunscreen agents in cosmetic preparations. They are capable of self-organization into bimolecular layers, and can thereby penetrate into the stratum corneum to a high extent and behave there in an extremely wash-resistant manner.