Method for producing an opaque coating

Claim 2

A PROCESS FOR CONTINUOUS PRODUCTION OF AN OPAQUE COATING ON A SUBSTRATE WHICH COMPRISES: A. DISPERSING AN ORGANIC LIQUID COMPRISING AT LEAST 85% BY VOLUME PARAFFINIC HYDROCARBONS AND HAVING A BOILING POINT OF AT LEAST ABOUT 300*F IN A LACQUER COMPRISING AS ESSENTIAL INGREDIENTS AT LEAST ONE CROSS-LINKABLE RESIN COMPRISING CELLULOSE ACETATE PROPRIONATE OR CELLULOSE ACETATE BUTYRATE HAVING AN HYDROXYL CONTENT OF AT LEAST ABOUT 4%, A CROSS-LINKING AGENT COMPATIBLE WITH SAID RESIN, AND AN ACID CATALYST ADAPTED FOR PROMOTING CROSSLINKING OF SAID RESIN WITH SAID CROSS-LINKING AGENT, SAID BOILING POINT BEING HIGHER THAN THE BOILING POINT OF SAID SOLVENT, THEREBY FORMING A SUBSTANTIALLY CLEAR COATING COMPOSITION COMPRISING A DISPERSION OF DROPLETS OF SAID ORGANIC LIQUID; B. APPLYING SAID COATING COMPOSITION TO SAID SUBSTRATE; AND C. HEATING SAID COATING COMPOSITION APPLIED TO SAID SUBSTRATE SUFFICIENTLY TO FIRST DRIVE OFF SAID SOLVENT AND PARTIALLY CURE SAID LACQUER ON SAID SUBSTRATE AND THEREAFTER DRIVE OFF SAID ORGANIC LIQUID, WITH REACTION BETWEEN SAID RESIN AND SAID CROSS-LINKING AGENT, THEREBY REPLACING SAID DROPLETS WITH VOIDS WITHOUT ANY SUBSTANTIAL PRECIPITATION OF SAID LACQUER, SAID VOIDS SCATTERING LIGHT SUFFICIENTLY TO FORM AN OPAQUE COATING WITHOUT REQUIRING THE USE OF DYES OR PIGMENTS.

Claim 3

The process of claim 1 wherein said coating is heated to a temperature of from about 250*-750*F.

Claim 4

The process of claim 1 wherein said heating is applied for a period of from about 1-60 seconds to cure said resin and provide said light-scattering voids.

Claim 5

The process of claim 1 wherein the hydroxyl content of said cross-linkable agent is from 4-7% and said cross-linking agent is a condensation polymer of a compound selected from the group consisting of a urea compound, thiourea, cyanamide, guanidine, and melamine, reacted with a lower aliphatic aldehyde or a lower aliphatic aldehyde and alcohol.

Claim 6

A PROCESS FOR CONTINUOUS PRODUCTION OF AN OPAQUE COATING ON A COIL SUBSTRATE WHICH COMPRISES: A. UNWINDING THE COIL; B. DISPERSING AN ORGANIC LIQUID COMPRISING AT LEAST 85% BY VOLUME PARAFFINIC HYDROCARBONS AND HAVING A BOILING POINT OF AT LEAST ABOUT 300*F IN A LACQUER COMPRISING AS ESSENTIAL INGREDIENTS AT LEAST ONE CROSS-LINKABLE RESIN COMPRISING CELLULOSE ACETATE PROPIONATE OR CELLULOSE ACETATE BUTYRATE HAVING AN HYDROXYL CONTENT OF AT LEAST ABOUT 4% A CROSS-LINKING AGENT COMPATIBLE WITH SAID RESIN, A SOLVENT FOR SAID RESIN AND SAID CROSS-LINKING AGENT, AND AN ACID CATALYST ADAPTED FOR PROMOTING CROSS-LINKING OF SAID RESIN WITH SAID CROSS-LINKING AGENT SAID BOILING POINT BEING HIGHER THAN THE BOILING POINT OF SAID SOLVENT THEREBY FORMING A SUBSTANTIALLY CLEAR COATING COMPOSITION COMPRISING A DISPERSION OF DROPLETS OF SAID ORGANIC LIQUID; C. COATING SAID UNWOUND SUBSTRATE WITH THE CLEAR COATING COMPOSITION OF STEP (B); D. HEATING CURING SAID CLEAR COATING COMPOSITION BY HEATING SAID COATING COMPOSITION APPLIED TO SAID SUBSTRATE SUFFICIENTLY TO FIRST DRIVE OFF SAID SOLVENT AND PARTIALLY CURE SAID LACQUER ON SAID SUBSTRATE AND THEREAFTER DRIVE OFF SAID ORGANIC LIQUID, WITH REACTION BETWEEN SAID RESIN AND SAID CROSS-LINKING AGENT, THEREBY REPLACING SAID DROPLETS WITH VOIDS WITHOUT ANY SUBSTANTIAL PRECIPITATION OF SAID LACQUER, SAID VOIDS SCATTERING LIGHT SUFFICIENTLY TO FORM AN OPAQUE COATING WITHOUT REQUIRING THE USE OF DYES OR PIGMENTS; AND E. REWINDING SAID SUBSTRATE INTO A COIL.

Claim 7

A PROCESS FOR CONTINUOUS PRODUCTION OF AN OPAQUE COATING ON A COIL SUBSTRATE WHICH COMPRISES: A. UNWINDING THE COIL; B. DISPERSING AN ORGANIC LIQUID COMPRISING AT LEAST 85% BY VOLUME PARAFFINIC HYDROCARBONS AND HAVING A BOILING POINT OF AT LEAST ABOUT 300*F IN A LACQUER COMPRISING AS ESSENTIAL INGREDIENTS AT LEAST ONE CROSS-LINKABLE RESIN COMPRISING CELLULOSE ACETATE PROPIONATE OR CELLULOSE ACETATE BUTYRATE HAVING AN HYDROXYL CONTENT OF AT LEAST ABOUT 4% A CROSS-LINKING AGENT COMPATIBLE WITH SAID RESIN, A SOLVENT FOR SAID RESIN AND SAID CROSS-LINKING AGENT, AND AN ACID CATALYST ADAPTED FOR PROMOTING CROSS-LINKING OF SAID RESIN WITH SAID CROSS-LINKING AGENT SAID BOILING POINT BEING HIGHER THAN THE BOILING POINT OF SAID SOLVENT THEREBY FORMING A SUBSTANTIALLY CLEAR COATING COMPOSITION COMPRISING A DISPERSION OF DROPLETS OF SAID ORGANIC LIQUID; C. COATING SAID UNWOUND SUBSTRATE WITH THE CLEAR COATING COMPOSITION OF STEP (B); D. HEATING CURING SAID CLEAR COATING COMPOSITION BY HEATING SAID COATING COMPOSITION APPLIED TO SAID SUBSTRATE SUFFICIENTLY TO FIRST DRIVE OFF SAID SOLVENT AND PARTIALLY CURE SAID LACQUER ON SAID SUBSTRATE AND THEREAFTER DRIVE OFF SAID ORGANIC LIQUID, WITH REACTION BETWEEN SAID RESIN AND SAID CROSS-LINKING AGENT, THEREBY REPLACING SAID DROPLETS WITH VOIDS WITHOUT ANY SUBSTANTIAL PRECIPITATION OF SAID LACQUER, SAID VOIDS SCATTERING LIGHT SUFFICIENTLY TO FORM AN OPAQUE COATING WITHOUT REQUIRING THE USE OF DYES OR PIGMENTS; AND E. REWINDING SAID SUBSTRATE INTO A COIL.