UV Absorber PR-25 CAS NO 7443-25-6

UV Absorber PR-25 CAS NO 7443-25-6

Applications
1.It can be used in solventborne coatings etc
2.It is recommended for use in PVC, polyesters, PC, polyamides, styrene plastics, EVA copolymers, and cellulosics;
3.It can be used direct with resins etc
4.It can be used alone etc
5.In 1.2mm PVC injection sheet etc

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Product Details

UV absorber PR-25 CAS NO 7443-25-6

high efficient UV-B absorber for plastics and coatings,non-discloring,

 

It can strognly abosorb UV-B (Low wavelength part of the ultraviolet spectruman;maximum wavelength up to 308nm ).it has higher absorb ratio compared with traditional Hydroxy-substituted benzotriazole and benzophenone type ; it doesn’t cause coloration of polymers which is impossible by traditional absorbers;it has great synergism effect with traditional hindered amine light stabilizers.

 

Product Name:

UV absorber PR-25

 

Chemical name: 

Propanedioic acid, [(4-methoxyphenyl)-methylene]-dimethyl ester;

 

CAS NO.:

7443-25-6

 

Molecular Formula: 

C13H14O5

 

Molecular Weight: 

250.2

 

Structure:

              38.gif

 

 

Synonyms:

Dimethyl (p-methoxybenzylidene)malonate;

Propanedioic acid, ((4-methoxyphenyl)methylene)-, dimethyl ester;

Propanedioic acid, 2-[(4-methoxyphenyl)methylene]-, 1,3-dimethyl ester;

Dimethyl 2-(4-Methoxybenzylidene)Malonate;

dimethyl 2-[(4-methoxyphenyl)methylidene]propanedioate;

Malonic acid, (p-methoxybenzylidene)-, dimethyl ester (8CI);

 

Specifications:

Item

Standard

Appearance

White to off-white crystalline   powders or granular

Melting point

55~59

TGA(10% mass loss,N210/min)

208

Solubility

Soluble in   acetone,MC,EA,toluene,xylene,alcohols etc solvents,insoluble in wa

 

Applications:

1.It can be used in solventborne coatings and general industrial coatings where stabilization requirements remain moderate.it is particularly recommended for UV cured systems and clear coats where colour neutrality is essential;

2.It  is recommended for use in PVC, polyesters, PC, polyamides, styrene plastics, EVA copolymers, and cellulosics;

3.It can be used direct with resins or be prepared in pre-dispersion granular form;or dissolve it in solvents to paint on the surface of products;

4.It  can be used alone or together with other light stabilizers;

5.In 1.2mm PVC injection sheet,the effect with 0.3% UV absorber PR-25 is much better than traditional absorbers HALS 123(CAS NO.:129757-67-1) and HALS 770(CAS NO.:52829-07-9) ;

6.In 1mm PC sheet,the effect with 0.3% UV absorber PR-25 is much better than other traditional UV absorbers UV absorber UV-234(CAS NO.: 70321-86-7) and UV absorber UV-1164(CAS NO.:2725-22-6);

7.Great synergism effect:When i is used together with HALS 123(CAS NO.:129757-67-1),the effect is much better than using absorber PR-25 or  HALS 123(CAS NO.:129757-67-1) alone

8.Recommended dosage: 0.3%

9.It just can be used in industry field

 

Package:

25kgs/drum or as customer’s request;

 

Storage:

Stock in dry,cool,well-ventilated shady place.keep package tightly closed not in use or during transportation

 

Transportation:

It  is not a dangerous goods according to transportation regulation;

 

Shelf life:

2 years from manufacture date in sealed original package under suitable storage condition

 

Lead time: 

prompt


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