Claims
- 1. A transparent receptor substrate suited for electrostatic reprography, which comprises a transparent composite polyester base (S) having a toner-receptive primer coating (P) on at least one of the face surfaces thereof, said composite polyester base comprising (a) a thick layer (A) of semicrystalline polyester and (b) a thin layer (B) of an identical or different polyester adhered to one face surface of said thick layer (A), and optionally a thin layer (B) of identical or different polyester adhered to another face surface of said thick layer (A), said at least one primer coating (P) comprising an acrylic polymer having a glass transition temperature ranging from 10.degree. C. to 50.degree. C., a free --COOH carboxylic functional group content less than 50 millimoles per 100 grams of said acrylic polymer and a thickness no greater than 0.3 .mu.m, wherein said thick layer (A) comprises no filler particles and said at least one primer coating (P) adheres to a face surface of at least one thin layer (B).
- 2. The transparent receptor substrate as defined by claim 1, the polyester layers (A) and (B) comprising crystalline film-forming polyesters.
- 3. The transparent receptor substrate as defined by claim 2, said film-forming polyesters comprising a polyterephthalate or polynaphthalenedicarboxylate of an alkylenediol.
- 4. The transparent receptor substrate as defined by claim 3, said film-forming polyesters comprising a polyterephthalate of ethylene glycol or of 1,4-butanediol.
- 5. The transparent receptor substrate as defined by claim 1, said acrylic polymer comprising recurring structural units derived from acrylic acid, methacrylic acid, an alkyl acrylate, an alkyl methacrylate, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, N-methylolacrylamide, N-methoxymethacrylamide, styrene, butadiene or vinyl esters, at least a fraction of said recurring structural units deriving from an alkyl acrylate and/or an alkyl methacrylate.
- 6. The transparent receptor substrate as defined by claim 3, said acrylic polymer comprising recurring structural units derived from methyl acrylate, ethyl acrylate, a propyl acrylate and/or a butyl acrylate and/or recurring structural units derived from methyl methacrylate, ethyl methacrylate, a propyl methacrylate and/or a butyl methacrylate.
- 7. The transparent receptor substrate as defined by claim 1, wherein the molar amount of free --COOH carboxylic functional groups in said acrylic polymer is no greater than 30 millimoles per 100 grams thereof.
- 8. The transparent receptor substrate as defined by claim 1, said acrylic polymer having a glass transition temperature ranging from 15.degree. C. to 30.degree. C.
- 9. The transparent receptor substrate as defined by claim 1, said at least one primer coating (P) comprising up to 25% by weight of a compound containing quaternary ammonium groups.
- 10. The transparent receptor substrate as defined by claim 9, said quaternary ammonium compound having the following general formula (I), or is a polymerizate thereof: ##STR7## in which R.sub.1 is an acyloxyalkyl or acylaminoalky radical containing a saturated acyl group or containing a carbon--carbon ethylenic double bond, an alkoxyalkyl radical, an aryloxyalkyl radical, an alkylaryloxyalkyl radical, an alkenyloxyalkyl radical or an alkenylaryloxyalkyl radical; R.sub.2, R.sub.3 and R.sub.4. which may be identical or different, are each an alkyl radical having from 1 to 6 carbon atoms or a polyoxyethylene radical ##STR8## or ##STR9## wherein n is a number ranging from 1 to 12; and X is an anion selected from among the halides, sulfate, sulfonate, the alkyl sulfonates, the arylsulfonates, the arylalkyl sulfonates, carbonate, the alkyl carbonates, nitrate, phosphate, the alkyl phosphates, or mixtures thereof.
- 11. The transparent receptor substrate as defined by claim 10, said quaternary ammonium compound comprising stearamidopropyldimethyl-.beta.-hydroxyethyl-ammonium nitrate.
- 12. The transparent receptor substrate as defined by claim 9, said quaternary ammonium compound comprising a monomer having one of the following general formulae (II) and (III), or is a polymerizate thereof: ##STR10## in which R.sub.5, R.sub.6 and R.sub.7, which may be identical or different, are each a hydrogen atom, a methyl radical or an ethyl radical; R.sub.8, R.sub.9 and R.sub.10, which may be identical or different, are each an alkyl radical having from 1 to 4 carbon atoms, or a polyoxyethylene radical ##STR11## or ##STR12## wherein m is a number ranging from 1 to 8; R.sub.11 is a divalent radical; and X is an anion selected from among the halides, sulfate, sulfonate, the alkyl sulfonates, the arylsulfonates, the arylalkylsulfonates, carbonate, the is alkyl carbonates, nitrate, phosphate, the alkyl phosphates, or mixtures thereof.
- 13. The transparent receptor substrate as defined by claim 1, said at least one primer coating (P) having a thickness eP ranging from 0.02 .mu.m to 0.2 .mu.m.
- 14. The transparent receptor substrate as defined by claim 13, said thickness eP ranging from 0.02 .mu.m to 0.15 .mu.m.
- 15. The transparent receptor substrate as defined by claim 1, said thin layer (B) comprising particulate filler material, and said composite polyester base (S) exhibiting a degree of haze no greater than 7%.
- 16. The transparent receptor substrate as defined by claim 1, said thick layer (A) having a thickness tA ranging from 50 .mu.m to 150 .mu.m and said thin layer (B) having a thickness tB no greater than 3 .mu.m.
- 17. The transparent receptor substrate as defined by claim 16, said thin layer (B) having a thickness tB ranging from 0.5 .mu.m to 1.5 .mu.m.
- 18. The transparent receptor substrate as defined by claim 1, said composite polyester base (S) exhibiting a degree of haze no greater than 7%, a shrinkage ratio in the lengthwise and transverse directions no greater than 1% at 150.degree. C. and a total roughness Rz no greater than 0.6 .mu.m.
- 19. The transparent receptor substrate as defined by claim 1, said thick layer (A) and said thin layer (B) being at least monoaxially oriented.
- 20. The transparent receptor substrate as defined by claim 1, said thick layer (A) and said thin layer (B) being at least biaxially oriented.
- 21. The transparent receptor substrate as defined by claim 1, comprising a sheet material.
- 22. The transparent receptor substrate as defined by claim 1, comprising a continuous film.
- 23. The transparent receptor substrate as defined by claim 1, having a toner pattern of adhered to said at least one primer coating (P).
- 24. The transparent receptor substrate as defined by claim 1, said composite polyester base (S) comprising a coextrudate.
- 25. A process for the preparation of the transparent receptor substrate as defined by claim 1, comprising coextruding said thick layer (A) and said thin layer (B) into said composite polyester base (S), and then depositing said primer coating (P) onto at least one face surface thereof.
- 26. The process as defined by claim 25, comprising at least biaxially orienting said composite polyester base (S) prior to depositing said at least one primer coating (P) thereon.
Priority Claims (1)
Number |
Date |
Country |
Kind |
94 11808 |
Sep 1994 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/55,529, filed on Sep. 28, 1995, now abandoned.
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4370379 |
Kato et al. |
Jan 1983 |
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Continuations (1)
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Number |
Date |
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Parent |
535529 |
Sep 1995 |
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