Multicomponent resin composition variable in light transmittance with temperature
US4731417A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1986 |
| Grant date | Mar 15, 1988 |
| Priority date | — |
| Expiry date | Mar 7, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L57/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a multicomponent resin composition which is essentially a blend of three polymers, each of which may be a copolymer, and undergoes a change in light transmittance and color with temperature. The first and second polymers are chosen in combination such that a blend thereof exhibits a phase diagram in which a lower critical solution temperature appears, and the third polymer is one which has mutual solubility, at least partially, with either or both of the first and second polymers. For example, polymethyl methacrylate and a copolymer of vinylidene fluoride and hexafluoroacetone, as the first and second polymers, and polyvinyl acetate are blended together. The phase separation temperature or coloring temperature of the multicomponent resin composition depends on the amount of the third polymer, and opacifying and coloring of the resin composition caused by heating become irreversible by cooling when the amount of the third polymer is sufficient. The multicomponent resin composition is useful as a thermal-mode information storage material and also as a light shield material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.