Method of applying mar resistant coatings to transparent bodies of super strong plastics
Abstract
Abstract TRANSPARENT BODIES, PARTICULARLY OPHTHALMIC LENSES, HAVING CORES OF SUPER STRONG PLASTIC, OUTER SURFACE LAYERS OF ABRASIONS RESISTANT THERMOSETTING RESINS SUCH AS THE ALLYL AND METHACRYLIC ESTERS AND AN INTERMEDIATE LAYER OF A POLYAMIDE. THE CORES ARE OF BISPHENOL-A POLYCARBONATE, OR OF A CLEAR, HETEROGENEOUS BLEND KNOWN AS ABS, WHICH IS A POLYBLEND OF THREE RESINS. THE SURFACE LAYER IS POLYMERIZED IN SITU. THE POLYAMIDE IS SELECTED FROM AMONG THOSE SOLUBLE IN ALCOHOL OR A MIXTURE OF ALCOHOL AND HYDROCARBONS. IT SERVES BOTH AS AN ADHESIVE TO BOND THE SURFACE LAYERS SECURELY TO THE CORES AND AS A BARRIER AGENT TO PROTECT THE CORES FROM CHEMICAL ATTACK BY THE MONOMER OF THE SURFACE LAYER MATERIAL. THE SURFACE LAYER IS PREFERABLY CURED IN A MOLD WHICH DEFINES THE SHAPE AND SURFACE FINISH OF THE COMPLETED BODY. D R A W I N G
Inventors
- 👤 C Sheld
Bibliographic Details
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