Claims
- 1. A method for improving the surface properties of articles molded from a pigmented polycarbonate in molds having radical contours and fine interstices, the improvement comprising blending 0.01 to 3% by weight of silica having a particle size between about 1 and 50 millimicrons into a polycarbonate resin containing sufficient pigment to opacify said polycarbonate resin when molded into an article.
- 2. The process of claim 1 wherein said polycarbonate resin is characterized by the repeating structural formula: ##STR3##
- 3. The process of claim 1 wherein said opacifying pigment is TiO.sub.2.
- 4. The process of claim 3 wherein said TiO.sub.2 is present at a level of 2 to 8 g/lb. of polycarbonate.
- 5. The process of claim 4 wherein said TiO.sub.2 is present at a level of 3 g/lb. of polycarbonate.
- 6. THe process of claim 1 wherein said silica is present at a level of 0.1 to 0.5% by weight based on the weight of the polycarbonate resin.
- 7. The process of claim 1 wherein said silica is produced by the flame hydrolysis of SiCl.sub.4.
- 8. A molded pigmented polycarbonate article produced by the process of claim 1.
Parent Case Info
This is a continuation of application Ser. No. 623,694 filed Oct. 20, 1975, and now abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
623694 |
Oct 1975 |
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