Heat transfer label
View Patent ↗A heat transfer label comprising a support portion and a transfer portion for transfer of the transfer portion from the support portion to an article. The article may be untreated polyethylene, polypropylene, PET, or acrylonitrile. Heat is applied to the support portion while the transfer portion is placed into contact with the untreated polyethylene, polypropylene, or acrylonitrile article. The transfer portion comprises an adhesive layer comprising a vinyl acetate resin, a tackifying petroleum hydrocarbon resin, and a microcrystalline wax.
1. A heat transfer label comprising:
(a) a support portion;
(b) a transfer portion over said support portion for transfer of the transfer portion from the support portion to an article that has not undergone an oxidizing treatment upon application of heat to the support portion while the transfer portion is placed into contact with the article, said transfer portion including at least
an ink layer; and
an adhesive layer comprising a vinyl acetate resin, a tackifying petroleum hydrocarbon resin, and a microcrystalline wax;
wherein said ink layer is disposed between said adhesive layer and said support portion.
2. The heat transfer label of claim 1 , wherein said vinyl acetate resin is an ethylene vinyl acetate resin further comprising a 39-42% vinyl acetate resin which is soluble in organic solvents and has a bulk density of about 30 lb/ft 3 , a ring and ball softening point of about 200° C., and a melt index of 48-66 grams per 10 minutes.
3. The heat transfer label of claim 2 , wherein said vinyl acetate resin is 70% of said adhesive layer, said tackifying petroleum hydrocarbon resin is 25% of said adhesive layer, and said micrycrystalline wax is 5% of said adhesive layer.
4. The heat transfer label of claim 1 , wherein said vinyl acetate resin is an ethylene vinyl acetate resin having a vinyl acetate content of between 18 and 42 percent.
5. The heat transfer label of claim 4 , wherein said tackifying petroleum hydrocarbon resin has a Tg range of between 30° C. and 85° C.
6. The heat transfer label of claim 1 , wherein said tackifying petroleum hydrocarbon resin has a Tg range of between 30° C. and 85° C.
7. The heat transfer label of claim 1 , wherein said microcrystalline wax further includes a melting point of 150-180° F., a hardness of greater than 10 dmm at 77° F., and is 30-60% normal paraffins.
8. The heat transfer label of claim 1 , wherein said transfer portion further comprises a protective lacquer layer.
9. The heat transfer label of claim 8 , wherein said protective lacquer layer further comprises a hard polyester or acrylic resin being a copolyester resin having a high tensile strength of 8000 psi, a low elongation of 7%, a 79 D scale Shore Durometer hardness, and a 156° C. ring and ball melt flow point.
10. The heat transfer label of claim 8 , wherein said transfer portion further comprises a release agent and at least one of a hard polyester resin and an acrylic resin.
11. The heat transfer label of claim 10 , wherein said release agent is a surfactant or a wax.
12. The heat transfer label of claim 11 , wherein said release agent is selected from the group consisting of dioctyl sodium sulfosuccinate in mineral seal oil, ethoxylated alcohol, and carnauba wax.
13. The heat transfer label of claim 12 , wherein said release agent is carnauba wax.
14. The heat transfer label of claim 8 , wherein said ink layer is proximal to said protective lacquer layer.
15. The heat transfer label of claim 14 , said ink layer comprising a resin chosen from a polyamide, a polyester, a vinyl, and an acrylic.
16. The heat transfer label of claim 15 , wherein said ink layer comprises a polyamide resin, and said polyamide resin is a clear alcohol soluble polyamide resin based on dimerized vegetable acid and aliphatic polyamines and having a Brookfield viscosity at 160° C. of 4-7 poise, a softening point of 105-115° C. and a Gardner color (maximum) of 7.
17. The heat transfer label of claim 1 , further comprising a release Layer interposed between said support portion and said transfer portion, the release Layer chosen from a wax release layer having wax in an amount of 6 to 8 pounds per 3,000 ft 2 of said support portion, or a non-wax release layer including a wax skim coat in the amount of 0.25 to 1.00 pound per ream.
18. The heat transfer label of claim 1 , wherein said support portion includes a sheet of paper.
19. The heat transfer label of claim 18 , wherein said support portion comprises one-sided clay-coated paper.