Method of providing a polycarbonate article with a uniform and durable organopolysiloxane coating
First Claim
1. A method of producing a polycarbonate article having improved mar, abrasion, scratch and chemical solvent resistance comprising the steps of:
- (i) applying onto a polycarbonate substrate a primer emulsion composition containing, in percent by weight, (a) from about 1 to about 10 percent of a thermosettable acrylic polymer, (b) from about 20 to about 45% of a hydroxy ether, and (c) from about 45 to about 79 percent of water;
(ii) evaporating off a substantial portion of said water and hydroxy ether from said primer emulsion composition to form a substantially solid layer comprised of thermosettable acrylic polymer;
(iii) thermally curing said thermosettable acrylic polymer to form a thermoset acrylic primer layer;
(iv) applying onto said cured primer layer a top coat composition comprised of a further curable organopolysiloxane;
(v) evaporating off a substantial portion of any solvents present in said top coat composition thereby forming a layer comprised of further curable organopolysiloxane; and
(vi) curing said further curable organopolysiloxane thereby forming a cured organopolysiloxane top coat.
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Abstract
A process for providing a uniform, durable and tenaciously adhered scratch, mar, abrasion and chemical solvent resistant organopolysiloxane coating on a polycarbonate substrate. The process includes (i) applying a priming composition comprising an emulsion of a thermosettable acrylic polymer and a hydroxy ether to a polycarbonate substrate; (ii) curing the thermosettable acrylic polymer thereby forming a thermoset acrylic primer layer on said substrate; (iii) applying a top coat composition containing a further curable organopolysiloxane onto said primed substrate; and (iv) curing said further curable organopolysiloxane.
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Citations
14 Claims
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1. A method of producing a polycarbonate article having improved mar, abrasion, scratch and chemical solvent resistance comprising the steps of:
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(i) applying onto a polycarbonate substrate a primer emulsion composition containing, in percent by weight, (a) from about 1 to about 10 percent of a thermosettable acrylic polymer, (b) from about 20 to about 45% of a hydroxy ether, and (c) from about 45 to about 79 percent of water; (ii) evaporating off a substantial portion of said water and hydroxy ether from said primer emulsion composition to form a substantially solid layer comprised of thermosettable acrylic polymer; (iii) thermally curing said thermosettable acrylic polymer to form a thermoset acrylic primer layer; (iv) applying onto said cured primer layer a top coat composition comprised of a further curable organopolysiloxane; (v) evaporating off a substantial portion of any solvents present in said top coat composition thereby forming a layer comprised of further curable organopolysiloxane; and (vi) curing said further curable organopolysiloxane thereby forming a cured organopolysiloxane top coat. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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3. The method of claim 2 wherein said hydroxy ether is butoxy ethanol.
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4. The method of claim 1 wherein said further curable organopolysiloxane is the hydrolysis and partial condensation product of an alkyl trialkoxysilane.
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5. The method of claim 4 wherein said alkyl trialkoxysilane is methyl trialkoxysilane.
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6. The method of claim 1 wherein said polycarbonate article is a sheet.
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7. The method of claim 6 wherein said sheet is transparent.
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8. A method for providing a uniform and durably adhered mar, scratch, abrasion and chemical solvent resistant organopolysiloxane coating on a polycarbonate article which comprises:
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(i) applying onto the surface of a polycarbonate substrate a primer emulsion composition containing, in percent by weight, (a) from about 1 to about 10 percent of a thermosettable acrylic polymer, (b) from about 20 to about 45 percent of a hydroxy ether, and (c) from about 45 to about 79 percent of water; (ii) evaporating off a substantial portion of said water and hydroxy ether from said primer emulsion composition to form a layer comprised of a thermosettable acrylic; (iii) thermally curing said thermosettable acrylic to form a thermoset acrylic primer layer; (iv) applying onto said cured primer layer a top coat composition containing a further curable organopolysiloxane; (v) evaporating off a substantial portion of any solvents present in said top coat composition thereby forming a layer comprised of further curable organopolysiloxane; and (vi) further curing said organopolysiloxane thereby forming a cured organopolysiloxane coating. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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10. The method of claim 9 wherein said hydroxy ether is butoxy ethanol.
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11. The method of claim 8 wherein said further curable organopolysiloxane is the hydrolysis and partial condensation product of an alkyl trialkoxy silane.
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12. The method of claim 11 wherein said alkyl trialkoxy silane is methyl trialkoxy silane.
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13. The method of claim 8 wherein said polycarbonate article is a sheet.
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14. The method of claim 13 wherein said sheet is transparent.
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Specification