Coated plastic substrates for coating compositions

Details Coated plastic substrates for coating compositions Coated plastic substrates for coating compositions

1974-07-01

1976-01-27

Willis, Jr., P. E.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427372, B05D 702, C08J 704

Patent

active

039353460

ABSTRACT:
There is provided a coating process, and compositions for practicing the process, wherein organic polymeric substrates, and especially polycarbonates and acrylics, are coated with a coating composition which is curable in a short period of time to provide the substrate with a hard, abrasion-resistant, mar-resistant, chemical resistant and acetone-resistant, strongly adhered coating. The coating composition employs the use of effective cure promoting amounts of a methanol and lower alkyl alcohol-melamine-formaldehyde partial condensate reaction products which are added to organopolysiloxanes made from methyltrialkoxysilane, wherein the organopolysiloxanes are made by a prescribed technique; the alkoxy groups contain one to six carbon atoms and the alkyl alcohol is a C.sub.2 to C.sub.4 alkyl alcohol or mixtures thereof. Most desirably, the organopolysiloxane is made from methyltriethoxysilane and the alkyl alcohol-melamine-formaldehyde partial condensate reaction product is an isobutylated and methylated melamine-formaldehyde. Clear, solid polycarbonate substrates are especially advantageously coated as provided herein to provide a coating with the above features and one which has good optical clarity.

REFERENCES:
patent: 2498485 (1950-02-01), Clawson
patent: 2500842 (1950-03-01), Mackenzie
patent: 2937155 (1960-05-01), Eastes et al.
patent: 2949434 (1960-08-01), Bailey et al.
patent: 3032442 (1962-05-01), Roth
patent: 3425974 (1969-02-01), Semroc
patent: 3432312 (1969-03-01), Feagin et al.
patent: 3433764 (1969-03-01), Walmsley
patent: 3457221 (1969-07-01), Stengle
patent: 3471388 (1969-10-01), Koral

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