TS-756/TS-754 solid nonsulfur tin stabilizer/lubricant system, intended for vinyl siding capstock formulations, is said to offer excellent light stability
compared with conventional tin mercaptides.
Display Permanence Ratings are based on accelerated light stability
tests conducted at 35 klux with glass-filtered cool white fluorescent illumination with the sample plane air temperature maintained at 24 C and 60% relative humidity.
The coating also provides good weatherability as well as light stability
- even during direct sunlight exposure through the skylight.
The new grade is said to represent a significant advance in light stability
The speaker discussed how polyisocyanates were introduced to improve functionality and how aliphatic polyisocyanates were used to enhance light stability
and weathering forces such as sunlight, temperature and moisture were discussed by Stephen Novak of Q-Panel Lab Products.
The most common uses are Red 122 (used in place of R57 where light stability
is an issue); Blue 16 and Blue 79 (used in place of B15 where reduced levels of copper are important); various HPP yellows (used in solvent inks where chemical resistance is needed); various HPP reds and yellows (used in laminating inks, particularly flooring); and various HPP reds and yellows (used in specialty metal deco, screen and outdoor poster applications where light and humidity resistance are important.
The light stability
of TPUs hinges on raw materials and techniques used in the production process.
Accelerated weathering equipment is typically used to determine if a formulation has the light stability
needed to survive outdoors.
Plasticizers for use in vinyl formulations include phthalates for good compatibility, low temperature flexibility, low volatility, heat and light stability
; epoxidized oils for hear and light stability
, low volatility and permanence; trimellitates for low volatility and preparation of high temperature electrical compounds; adipates for low temperature flexibility; citrates for minimal residual taste or odor with good resistance to water extraction; and polymeries for low volatility and resistance to extraction and for compounds that must resist oil or solvent extraction.
Many OEM computer printer manufacturers, ink jet ink and paper suppliers are rushing to develop a standardized light stability
test protocol that will generate meaningful test data.
The Q-Sun is used to test products and materials for weatherability and light stability