Patent EA-000164-B1 (EA)
Title: Composition of wear resistant image printing on latex surfaces, method of image printing and articles thereof
Inventor: MATTESKY HENRY
IPC: C09D11/02
Filed: 1996-01-05
Abstract: 1. A formulation containing natural rubber, solvent therefor and pigment, for printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, characterized therein that said formulation comprises as components: a) a clear coat comprising: natural rubber and a solvent therefor, b) a premixed portion comprising: an aromatic hydrocarbon solvent and aryldiisocyanate c) pigment, said components being mixed prior to printing the image on said surface. 2. The formulation of Claim 1 wherein the clear coat solvent is selected from the group consisting of aromatically unsaturated solvents, terpenes and terpenoids. 3. The formulation of Claims 1 -3 wherein the approximate weight of aryldiisocyanate is between 0.5 and 3 times that of the rubber in the ink. 4. The formulation of Claim 1-3 wherein a) the clear coat comprises natural rubber 1-10 parts by weight and an aromatic hydrocarbon solvent: 45-55 parts by weight, b) the premixed portion comprises: an aromatic hydrocarbon solvent 2-1 5 parts by weight and the agent is an aryl diisocyanate: 1 - 30 parts by weight; and c) the pigment comprises 0.3-5.0 parts by weight. 5. The formulation of Claim 4 wherein the aryldiisocyanate is selected from the group consisting of toluenesocyanates, methylenediphenyldiisocyanates.- and polymeric methylenediphenyldiisocyanates. 6. The formulation of Claims 1-5 wherein the viscosity of the ink at time of printing is in the range of about 800 to about 3000 cps at 20 degree C 7. A formulation containing natural rubber, solvent therefor and pigment, for printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, characterized therein that said formulation comprises as separate components: a) a base coat comprising natural rubber, and a solvent for rubber and b) an ink comprising natural or synthetic rubber; a solvent for rubber and pigment; provided in at least one of the components (a) and (b) aryldiisocyanate is present. 8. The formulation of Claims 7, wherein the approximate weight of aryl diisocyanate is between 0.5 and 3 times that of the sum of the rubber in the base coat and in the ink. 9. The formulation of Claims 7-8 wherein a) the base coat comprises natural rubber: 5-15 parts by weight, a solvent for rubber: 80-120 parts by weight, aryl diisocyanate, as integrating agent: 0- 45 parts by weight; and b) the ink comprises natural or synthetic rubber 1-10 parts by weight; a solvent for rubber 30-80 parts by weight; pigment: 0.3-5.0 parts by weight; and aryl diisocyanate, as integrating agent: 0- 30 parts by weight; 10. The formulation of Claims 7-9 wherein the solvent for rubber is at least one member of the group consisting of an aromatic hydrocarbon, a terpene, a terpenoid or a ketone boiling above 120 degree C. 11. The formulation of Claims 7-10 wherein, the aryldiisocyanate is selected from the group consisting of toluenediisocyanate -, methylene diphenyl diisocyanates and polymeric methylene diphenyl diisocyanates and mixtures thereof. 12. The formulation of Claims 7-12 wherein a) the base coat comprises, as the solvent for rubber therein, an aromatic hydrocarbon solvent: 60-90 parts by weight, a terpene or terpenoid solvent:0-60 parts by weight; and b) the ink comprises, as the solvent for rubber therein an aromatic hydrocarbon solvent: 30-50 parts by weight and a terpene or terpenoid solvent:0-30 parts by weight. 13. The formulation of Claims 7-12 wherein a) the base coat comprises natural rubber: 5-15 parts by weight; an aromatic hydrocarbon solvent: 80-120 parts by weight; and aryldiisocyanate: 1-45 parts by weight and b) the ink comprises synthetic rubber: 1-10 parts by weight; an aromatic hydrocarbon solvent: 30-80 parts by weight; and pigment: 0.3-5 parts by weight. 14. The formulation of Claims 7-12 wherein a) the base coat comprises natural rubber: 5-15 parts by weight; and an aromatic hydrocarbon solvent: 80-120 parts by weight and b) the ink comprises synthetic rubber: 1-10 parts by weight; an aromatic hydrocarbon solvent: 30-60 parts by weight, pigment: 0.3-5.0 parts by weight: and aryldiisocyanate: 1- 30 parts by weight. 15. The formulation of Claims 7-12 wherein a) the base coat comprises natural rubber: 5-15 parts by weight; an aromatic hydrocarbon solvent: 80-120 parts by weight and aryldiisocyanate: 1-45 parts by weight and b) the ink comprises synthetic rubber:!- 10 parts by weight; an aromatic hydrocarbon solvent: 15-60 parts by weight; a terpene or terpenoid solvent 5-40 parts by weight; and pigment: 0.3-5.0 parts by weight. 16. The formulation of Claims 7-12 wherein a) the base coat comprises natural rubber: 5-15 parts by weight and an aromatic hydrocarbon solvent: 80-90 parts by weight and b) the ink comprises synthetic rubber: 1-10 parts by weight; an aromatic hydrocarbon solvent: 15-60 parts by weight; a terpene or terpenoid solvent 5-40 parts by weight; pigment: 0.3-5.0 parts by weight, and aryldiisocyanate: 1- 30 parts by weight. 17. The formulation of Claims 1-16 wherein the aromatic solvent is methyl naphthalene. 18. A method of printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, with a formulation containing natural rubber, solvent therefor and pigment, characterized by preparing an ink by mixing the formulation of any of Claims 1-6 at ambient temperature. 19. The method of printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, with a formulation containing natural rubber, solvent therefor and pigment, characterized by preparing an ink by mixing the formulation of Claim 2 at ambient temperature. 20. The method of printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, with a formulation containing natural rubber, solvent therefor and pigment, characterized by preparing an ink by mixing the formulation of Claim 5 at ambient temperature and printing the image on said surface with said ink within 10 hours of combining the components of the mixture. 21. The method of printing an image on a latex rubber surface which is resistant to abrasion and chemical attack, with a two part formulation of a base coat comprising natural rubber and solvent therefor and an ink comprising rubber, a solvent therefor and pigment, characterized by applying to said surface a base coat coating of any of Claims 7-17 and printing the image onto said base coat with an ink of any of Claims 7-17. 22. The method of Claim 21 wherein the viscosity of the ink at time of printing is in the range of about 800 to about 3000 cps at 20 degree C. 23. The method of Claims 21-22 wherein the surface is a natural latex rubber surface. 24. The method of Claim 21-23 which comprises allowing said base coat to become tacky before printing with the ink. 25. The method of Claims 21-24 which comprises allowing said base coat to become dry before printing with the ink. 26. The method of Claims 21-25 comprising the additional step of heating the printed surface. 27. The method of Claim 26 wherein the heating is carried out in a time and in a temperature range of from 95 to 130 degree C for 10 to 20 minutes. 28. The method of Claim 26 wherein the heating is carried out in a time and in a temperature range of from 190 to 230 degree C for 3 to 8 seconds. 29. The method of Claims 21-28 additionally comprising permitting the printed surface to cure at ambient conditions for from 5-60 days. 30. A rubber latex object having a design printed thereon by the method of Claim 18. 31. A rubber latex object having a design printed thereon by the method of Claim 21. 32. A rubber latex object glove in accordance with Claim 30. 33. A rubber latex glove in accordance with Claim 31 34. A natural rubber latex glove having a design printed thereon by the method of Claim 22.