Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2000-10-19
2001-12-25
Dawson, Robert (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C428S413000, C428S417000, C428S418000, C523S456000, C523S463000
Reexamination Certificate
active
06333369
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an epoxy-based coating resin composition which facilitates the transcription of the printed letters or photographs developed by sublimation dyes on printing paper to the surface of potteries, glasses, marbles, metals or woods only by thermal treatment and more particularly, to the epoxy-based coating resin composition with 1) long-term storage stability due to the use of a mixture, of diethanolamine and triethanolamine as a hardening accelerator, 2) good depth in the transfer printing, and 3) a releasing property which promotes easier separation of printing paper from its coated surface after transfer-printed.
2. Description of the Related Art
It has been generally known that an epoxy-based resin composition containing a hardening agent is effective to transcribe the printed letters or photographs developed by sublimation dyes on printing paper to a coating layer by thermal treatment[Ger. Pat. No. 2,424,949(1974)]. A mixture of acryl and melamine resin as a coating layer was used to transcribe the printed letters or photographs developed by sublimation dyes on printing paper to aluminum pipes. An epoxy resin was finally coated [Jap. Pat No. 119,006(1979)].
A coating layer was required to transcribe the printed letters or photographs developed by sublimation dyes on printing paper to the surfaces of potteries, glasses, marbles, metals or woods, etc. It provided a rapid decoration with printed letters, patterns or photographs to the surface of potteries, glasses, marbles, metals or woods only by thermal treatment. In order to get a good transfer printing, the printed letters or photographs developed by sublimation dyes on printing paper was used. Then, it is necessary to get uniform thickness of a coating layer to be transfer-printed.
The essential properties of coating resin compositions used in transcribing the printed letters or photographs developed by sublimation dyes on printing paper to the coated surface are required as follows:
1. It must provide a coating layer with good transparency, chemical and water resistance, and good adhesion between original surfaces and its coated ones, etc.
2. It must provide both good flexibility to prevent the coating layer from cracking caused by thermal contraction when dried and the ability to restrain the transcribed letters or photographs from discoloring by ultraviolet lights or air.
3. It must produce a coating layer with initial and durable adhesive strength in the condition that the printed letters or photographs developed by sublimation dyes on printing paper are deeply transfer-printed only by thermal treatment.
4. It must promote easier separation of printing paper from the coated layer printing after the thermal treatment.
5. It must provide long-term storage stability at room temperature on the condition that hardening agents are in a same vessel.
Most of epoxy resins existed in the coating resin composition for transfer printing are bisphenol- or phenol-formaldehyde resin with oxirane rings, wherein their epoxide equivalent weight(EEW) is in the range of 180-3300. If EEW in the epoxy resins is below 220, the viscosity of the resins in a liquid state shows in the range of 2-230 poise, while if EEW exceeds 220, most of the resins are in a solid state.
A coating resin composition used in the transfer printing contains some kinds of hardening agents for its curing, and the resin composition containing the agents is unstable even at room temperature. Nevertheless, it is always necessary to enhance the strength, flexibility and heat resistance of the coating layer. The agents used here are amines, acid anhydrides, imidazoles and ureaformaldehyde resins, etc.
Also, in order to control the thickness of the coating layer, various organic solvents as a diluent are used. The weight ratio of aliphatic component to aromatic one as well as the molecular weight distribution in the resin composition is adjusted to get the flexibility of coating layer.
Tertiary amines[J. Appl. Polym. Sci., 10, 1813 (1770)], esters of boric. acid[Polym. Eng. Sci., 16, 353 (1976)], lewis acids[US. Pat. No. 5,521,011(1996)], organometallic compounds[J. Polym. Sci. C., 23, 765 (1968)], organic acid metallic,: salts[J. Polym. Sci. A-1., 8, 593 (1970)] and imiidazoles[J. Appl. Polym. Sci., 11, 1009 (1967)] are used to promote a hardening reaction.
SUMMARY OF THE INVENTION
A coating resin composition with physical properties above-mentioned has been achieved by this invention. As a result, an epoxy-typed resin composition containing a mixture of triethanolamine and diethanolamine as a hardening agent and various organic solvents as diluent together is prepared: a coating layer obtained from the resin composition is used to transcribe the printed letters or photographs developed by sublimation dyes on printing paper to the surfaces of potteries, glasses, marble, metals or woods only by thermal treatment.
DETAILED DESCRIPTION OF THE INVENTION
A coating resin composition for transfer printing containing an epoxy resin, a hardening agent, a hardening accelerator and various organic solvents, is characterized by using a mixture of triethanolamine and diethanolamine as a hardening accelerator.
Detailed description of the invention is as follows.
The present invention relates to a coating resin composition which is possible to transcribe the printed letters or photographs developed by sublimation dyes on printing paper to the surface of potteries, glasses, marbles, metals or woods only by thermal treatment: the resin composition contains a mixture of diethanolamine and triethanolamine as a hardening accelerator. Thus, it brings about long-term storage stability at room temperature and a releasing property that promotes easier separation of printing paper from its coated layer.
The quantity of an epoxy resin, a hardening agent and the hardening accelerator that is solidified by a hardening reaction of above resin composition is used within 10-50 parts in weight. If it is less than 10 parts in weight, the coating layer is too thin to transcribe. But in the quantity more than 50 parts in weight, it is difficult to get a uniform transfer printing to the coating layer.
An epoxy resin existed in the coating resin composition is one or more selected from glycidylates of bisphenol, phenol, phenol-formaldehyde resin or dicarboxylic acid (e.g. phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid and p-hydroxybenzoic acid). Its molecular weight, epoxy equivalent weight, viscosity, color number, and softening point are selected based on the physical properties of a coating layer above-required. In order to increase the strength of coated layer, an aromatic epoxy resin with high molecular weights is used, while an aliphatic epoxy resin with higher epoxy equivalent weight and relatively low molecular weight is used to get the flexibility of coated layer. The epoxy equivalent weight of epoxy resin used in this invention is in the range of 180-3300.
Amine-typed hardening agents used in this invention are polyamine compounds such as hexamethylene diamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, bis(oxamethylene)triamine, trimethyhexamethylenediamine, diethylaminopropylamine, bezenediamine, isopropyondiamine, bis(4-amino-3-methylcyclohexyl)methane, N-aminoethylpiperidine, m-phenylenediamine, diaminophenylmethane or diaminophenylsulfone, etc.; modified amines are epoxy resin products added to polyamine, ethyleneoxide or propyleneoxide products added to polyamine, cyanoethylated polyamine, N,N′-dimethylpiperidine, 2-(dimethylamineomethyl)phenol and 2,4,6,-tris(dimethylaminomethyl)phenol, etc. Anhydride-typed hardening agents are phthalic anhydride, trimellitic anhydride, pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, ethylene glycol bis(anhydrotrimellitate), glycerol tris(anhydrotrimellitate), maleic anhydride, succinic anhydride, tetrahydrophthalic anhydride, methy
Chung Bong Soo
Kim Jong Hak
Park In-Hwan
Song Bong Keun
Aylward D.
Dawson Robert
Finnegan Henderson Farabow Garrett & Dunner LLP
Korea Research Institute of Chemical Technology
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