PRODUCTS

UV Absorber

UV-3638

Equivalent:	Cyasorb UV-3638 (CYTEC)
Chemical name:	2,2'-(1,4-Phenylene)bis[4H-3,1-benzoxazin-4-one]
CAS NO.:	18600-59-4
Molecular formula:	C22H12N2O4
Molecular weight:	368.34
Chemical structure

Specification
Appearance	:	white to off-white crystalline powder
Assay (HPLC)	:	98.0% min
Melting point	:	310°C min
Loss on drying	:	0.5% max
Ash	:	0.1% max

Description
UV-3638 is a highly efficient benzoxazinone type UV absorber, which is distinguishied by its superiorly low volatility, and its strong & broad range of UV light absorption together with no color contribution & excellent stabilization for polymers. White UV-3638 is designed to meet the demanding high temperature requirements for processing engineering plastics such as Nylon, PC,PET,PBT and PPO. UV-3638 is also highly effective in other poymers such as polyamides, polyacetals, polyolefins fibers, styrenics, elastomers where long term permanet UV light stability is required.

Application
Engineering plastics (Nylone/plycarbonate/PET/PBT/PPO/PPS..etc)
.Because of it's superior heat resistance, so its volatility is extremely low during the processing of engineering plastics at temperatures above 300°C. Also, it offering a very strong & broad UV absorption with no color contribution and exllent stabilzation. so it will allow the recycling or reworking of scrap without significant lowss of the UV light stability. UV-3638 meets the stringent requirement of applications where light transmission and optical properties are critical.

Other polymers
Because of its high absorptivity in the range of 300-360nm, plus its extremely low volatility, assures maximal resistance to UV light degradation even during long term indoor and out door exposure.

UV-3638 can be readily incorporated in the polymers within the dosage range of 0.1-10% by weight through conventional techniquire such as powder, solution, or melt blending(e.g. extrusion compounding). It can be used alone or in a variety of blends and combinations with antioxidants, phosphites and other light stabilizers where often a synergistic performance is observed. Basically, the dosage level for UV-3638 can be expectd to be 1/3 of the exsited benzotriazole type UV absorbers with the nearly same efficency of UV screenning.i

Package
25kg / carton box