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US 5,849,414 AGranted
Production of scratch-resistant polycarbonate moulded parts
AssigneeBayer Aktiengesellschaft
InventorsPeter Bier, Dieter Freitag, Gerhard Schottner
Life of this patent
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Abstract
Method for coating the surface of polycarbonate moulded parts, with a polycarbonate based on a diphenol of formula (Ia) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, X and m are defined herein, and a material (b), which has been obtained by hydrolytic polycondensation of an aluminum compound of an organofunctional silane and an oxide component.
Claims12
A method for coating polycarbonate moulded parts, the method comprising the steps of:
- a) applying a material obtained by hydrolytic polycondensation of an aluminum compound of an organofunctional silane and an oxide compound, in a thickness of from 2 to 200 .mu.m, to a surface of a moulded body comprising a polycarbonate containing diphenol-units in which 2 to 100 mol-% of the diphenol-units correspond to a dihydroxydiphenylcycloalkane of formula (Ia);
- ##STR9## where R.sup.1 and R.sup.2, independently of one another, represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl, or C.sub.7 -C.sub.12 aralkyl,
- m is 4 or 5,
- R.sup.3 and R.sup.4, independently of one another, are individually selectable for each X and represent hydrogen or C.sub.1 -C6 alkyl, and
- X represents carbon,
- with the proviso chat on at least one atom X, R.sup.3 and R.sup.4 simultaneously represent alkyl, and
- b) curing the material at a temperature of between 135.degree. and 180.degree. C.
4 more elements
A polycarbonate moulded body comprising:
- a) a thermoplastic, aromatic polycarbonate having a molecular weight M.sub.w of at least 10,000 and containing bifunctional carbonate structural units in which 2 to 100 mol-% of the bifunctional carbonate structural units correspond to a compound of formula (I):
- ##STR11## (I), where R.sup.1 and R.sup.2, independently of one another, represent hydrogen, halogen, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl, or C.sub.7 -C.sub.12 aralkyl,
- m is 4 or 5,
- R.sup.3 and R.sup.4, independently of one another, are individually selectable for each X and represent hydrogen or C.sub.1 -C.sub.6 alkyl, and
- X represents carbon,
- with the proviso that on at least one atom X, R.sup.3 and R .sup.4 simultaneously represent alkyl, and
- b) a layer having a thickness of from 2 to 200 .mu.m, the layer being obtained by hydrolytic polycondensation of an aluminum compound of an oganofunctional silane and an oxide compound.
4 more elements
Dependencies are inferred from the claim text.