UV-stabilized polymeric structure
A UV protection technology, applied to synthetic resin layered products, other chemical processes, and other household appliances, can solve problems such as damage, reduced impact resistance, and inability of UV absorbing compounds
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0043] This example illustrates one embodiment of the UV-stabilized structures of the present invention. The polycarbonate of 2,2,4,4-tetramethyl-1,3-cyclobutanediol is made into an intrinsic viscosity (IV) of 0.6 dL / g (in phenol: 1,1,2,2-tetra Ethyl chloride is 0.25% by weight in 60:40). The polycarbonate was dissolved in methylene chloride and a sufficient amount of bis[2-hydroxy-5-tert-octyl-3-(benzotriazol-2-yl)phenyl]methane (available from Fairmont, Newark, NJ) was added. Chemical Company under the name Mixxim BB-100) such that the dimeric benzotriazole constitutes 3% by weight of the combined weight of polycarbonate and UV absorbing compound. The solution was evaporated and the resulting material was granulated. The particles were dissolved in trifluorotoluene at a concentration of 5% by weight, and then the solution was used to copolymerize polyethylene terephthalate modified with 31% by mole of 1,4-cyclohexanediol A film with a thickness of 3 mm was coated on a thin ...
Embodiment 2
[0045] This example illustrates that a copolymer coated only with 2,2,4,4-tetramethyl-1,3-cyclobutanediol based polycarbonate fails to maintain its color and physical properties in the absence of a UV absorbing compound . The same structure as in Example 1 was prepared except that no UV absorbing compound was used. During the first 384-hour exposure interval, the b of the sheet * The value increases rapidly as the exposure time increases, exceeding the initial value by 5b * unit. In addition, the final results of the test showed that the haze was much higher than that of the original sheet, and the results of the impact strength test in the plane direction showed that the material became very brittle.
Embodiment 3
[0047] This example illustrates another embodiment of the invention. The 2,2,4,4-tetramethyl-1,3-cyclobutanediol-based polycarbonate prepared in Example 1 and the compound containing dibenzotriazole were compressed into 2 mil (50 micron ) to 5 mil (125 micron) thick film. These films were subsequently extrusion laminated to the copolyester of Example 1. Extrusion of the copolyester was accomplished with all heated zones of the extruder barrel (2.5 inch diameter screw), die adapter and die set at 240°C. Cut out the test sheet and put it into the UVCON machine for exposure. After 1536 hours of exposure in the UVCON machine, the initial b * value and the final b * The values are 0.99 and -0.16 (average of four different samples), respectively. Since in this low color range the change is not dramatic enough to be noticed by the observer, this slight reduction is acceptable. The initial haze was 2.08% and the final haze was 2.38% (average of four different samples). The su...
PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More