Radiation cure of coating compositions containing diacrylate monomer and hiding pigment
First Claim
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1. A method comprising exposing a coating of an ionizing irradiation curable coating composition comprising:
- a. diacrylate monomer which is 3-acrylyloxy-2,2-dimethylpropyl 3-acrylyloxy-2,2-dimethylpropionate, 1,3-bis(acrylyloxy-2,2-dimethylpropane or mixtures thereof and which constitutes from about 30 percent to 100 percent by weight of the binder of said coating composition;
b. hiding pigment which is titanium dioxide, zinc oxide, lithopone or mixtures thereof wherein the hiding pigment to diacrylate monomer weight ratio of said coating composition is in the range of from about 0.3;
1 to about 3;
1; and
c. from about 0.5 to about 10 percent triphenyl phosphine by weight of said compositionwhile the surface of said coating opposite the substrate upon which it is coated is in contact with a curing atmosphere containing from about 300 to about 1000 parts oxygen by volume per million parts curing atmosphere by volume, to at least about 4 megarads of ionizing irradiation of an energy equivalent to at least 100,000 electron volts to cure said coating to a hard film having a high degree of surface mar resistance.
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Abstract
Coating compositions containing the oxygen sensitive diacrylate monomers 3-acrylyloxy-2,2-dimethylpropyl 3-acrylyloxy-2,2-dimethylpropionate, 1,3-bis(acrylyloxy)-2,2-dimethylpropane or mixtures thereof and further containing hiding pigment are cured by ionizing irradiation in the presence of a curing atmosphere containing from about 300 to about 1000 parts oxygen per million parts curing atmosphere. The resulting cured coating compositions are useful as protective coatings for many substrates.
30 Citations
16 Claims
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1. A method comprising exposing a coating of an ionizing irradiation curable coating composition comprising:
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a. diacrylate monomer which is 3-acrylyloxy-2,2-dimethylpropyl 3-acrylyloxy-2,2-dimethylpropionate, 1,3-bis(acrylyloxy-2,2-dimethylpropane or mixtures thereof and which constitutes from about 30 percent to 100 percent by weight of the binder of said coating composition; b. hiding pigment which is titanium dioxide, zinc oxide, lithopone or mixtures thereof wherein the hiding pigment to diacrylate monomer weight ratio of said coating composition is in the range of from about 0.3;
1 to about 3;
1; andc. from about 0.5 to about 10 percent triphenyl phosphine by weight of said composition while the surface of said coating opposite the substrate upon which it is coated is in contact with a curing atmosphere containing from about 300 to about 1000 parts oxygen by volume per million parts curing atmosphere by volume, to at least about 4 megarads of ionizing irradiation of an energy equivalent to at least 100,000 electron volts to cure said coating to a hard film having a high degree of surface mar resistance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method comprising:
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a. applying to a substrate a coating of an ionizing irradiation curable coating composition comprising; (1) diacrylate monomer which is 3-acrylyloxy-2,2-dimethylpropyl 3-acrylyloxy-2,2-dimethylpropionate, 1,3-bis(acrylyloxy)-2,2-dimethylpropane or mixtures thereof and which constitutes from about 30 percent to 100 percent by weight of the binder of said coating composition, (2) hiding pigment which is titanium dioxide, zinc oxide, lithopone or mixtures thereof wherein the hiding pigment to diacrylate monomer weight ratio of said coating composition is in the range of from about 0.3;
1 to about 3;
1, and(3) from about 0.5 to about 10 percent triphenyl phosphine by weight of said composition; and b. while the surface of said coating opposite said substrate is in contact with a curing atmosphere containing from about 300 to about 1000 parts oxygen by volume per million parts curing atmosphere by volume, exposing said coating to at least about 4 megarads of ionizing irradiation of an energy equivalent to at least 100,000 electron volts to cure said coating to a hard film having a high degree of surface mar resistance. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A coating composition capable of being cured by exposure to ionizing radiation in contact with a curing atmosphere containing from about 300 to about 1,000 parts oxygen by volume per million parts curing atmosphere by volume, said coating composition comprising:
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a. diacrylate monomer which is 3-acrylyloxy-2,2-dimethylpropyl 3-acrylyloxy-2,2-dimethylpropionate, 1,3-bis(acrylyloxy)-2,2-dimethylpropane or mixtures thereof and which constitutes from about 30 percent to 100 percent by weight of the binder of said coating composition; b. hiding pigment which is titanium dioxide, zinc oxide, lithopone or mixtures thereof wherein the hiding pigment to diacrylate monomer weight ratio of said coating composition is in the range of from about 0.3;
1 to about 3;
1; andc. from about 0.5 to about 10 percent triphenyl phosphine by weight of said composition. - View Dependent Claims (14, 15, 16)
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Specification