Claims
- 1. Label stock comprising a flexible plastic film backing and a thin adhesive layer, said plastic film backing having a thickness of 25-150 micrometers and comprising a polymer of the urethane oligomer ##STR5## wherein Z is an end-capping addition-polymerizable moiety comprising acrylyl methacrylyl, allyl or vic-epoxy groups,
- Y is the divalent residue of an organic diisocyanate, Y(NCO).sub.2, Y being an alkylene group with 4 to 13 carbon atoms, a cycloalkylene group or an arylene group,
- X is the residue of oligomeric alcohol, X(OH).sub.n, selected from polyester polyols, polyether polyols, polyacrylate polyols, polyolefin polyols, and polysiloxane polyols and having a number average molecular weight of 500 to 5000 and a glass transition temperature below 250.degree. K., and
- n has an average value of 1 to 4.
- 2. Label stock as defined in claim 1 wherein said urethane oligomer has the formula ##STR6## where X, Y and n are as defined in claim 1 except that n has an average value of 2 to 4, a is an integer having a value of 2 to 6 and R is hydrogen or methyl.
- 3. Label stock as defined in claim 1 wherein said urethane oligomer is a polyesterurethane acrylate or methacrylate.
- 4. Label stock as defined in claim 1 wherein said urethane oligomer is a polycaprolactoneurethane acrylate.
- 5. Label stock as defined in claim 1 wherein said urethane oligomer is a polysiloxaneurethane acrylate or methacrylate.
- 6. Label stock as defined in claim 1 wherein said urethane oligomer is a polyacrylateurethane acrylate or methacrylate.
- 7. Label stock as defined in claim 1 wherein said adhesive is a pressure-sensitive adhesive.
- 8. Label stock as defined in claim 1 wherein Y is ##STR7##
- 9. Label stock as defined in claim 1, having nitrocellulose-based flexographic ink applied to the untreated exposed face of the flexible plastic film backing, the applied ink having good resistance to abrasion.
- 10. Label stock as defined in claim 1 wherein a reactive diluent has been reacted with said oligomer.
- 11. Label stock as defined in claim 10 wherein said reactive diluent was a crosslinking reactive diluent.
- 12. Label stock as defined in claim 11 wherein the crosslinked reactive diluent was a multifunctional acrylate.
- 13. Method of making label stock comprising the steps of (1) polymerizing the urethane oligomer ##STR8## wherein Z is an end-capping addition-polymerizable moiety comprising acrylyl, methacrylyl, allyl or vic-epoxy groups,
- Y is the divalent residue of an organic diisocyanate, Y(NCO).sub.2, Y being an alkylene group with 4 to 13 carbon atoms, a cycloalkylene group or an arylene group,
- X is the residue of oligomeric alcohol, X(OH).sub.n, selected from polyester polyols, polyether polyols, polyacrylate polyols, polyolefin polyols, and polysiloxane polyols and having a number average molecular weight of 500 to 5000 and a glass transition temperature below 250.degree. K., and
- n has an average value of 1 to 4, to provide a flexible plastic film having a thickness of 25-150 micrometers, and
- (2) adhering a thin adhesive layer to the plastic film.
- 14. Method as defined in claim 13 wherein step (1) involves the sub-steps of
- (a) combining the urethane oligomer and a photo initiator into a syrup of a coatable viscosity,
- (b) coating the syrup onto a substrate, and
- (c) irradiating the coating with ultraviolet light to polymerize the urethane oligomer.
- 15. Method as defined in claim 14 wherein sub-step (a) of step (1) includes the addition of a reactive diluent.
- 16. Method as defined in claim 15 wherein the reactive diluent is a crosslinking reactive diluent.
- 17. Method as defined in claim 16 wherein the crosslinking reactive diluent is a multifunctional acrylate or methacrylate.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of applicants' copending application Ser. No. 957,238 filed Nov. 2, 1978, now abandoned.
US Referenced Citations (11)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
957238 |
Nov 1978 |
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