Multilayer, transparent film made from polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) for producing packaging composites with UV protection
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-007/02
B32B-015/09
B32B-015/08
B32B-027/08
B32B-027/18
B32B-027/36
출원번호
US-0462337
(2003-06-16)
등록번호
US-7285322
(2007-10-23)
우선권정보
DE-102 27 442(2002-06-20)
발명자
/ 주소
Kliesch,Holger
Kiehne,Thorsten
Janssens,Bart
Schmiedeskamp,Christine
출원인 / 주소
Mitsubishi Polyester Film GmbH
대리인 / 주소
ProPat, L.L.C.
인용정보
피인용 횟수 :
1인용 특허 :
28
초록▼
The invention relates to an at least two-layer polyester film with a total thickness of from 5 to 200 μm which comprises, alongside polyethylene terephthalate, from 2 to 20% by weight--based on the weight of the entire film--of polyethylene naphthalate (PEN), where at least one outer layer comp
The invention relates to an at least two-layer polyester film with a total thickness of from 5 to 200 μm which comprises, alongside polyethylene terephthalate, from 2 to 20% by weight--based on the weight of the entire film--of polyethylene naphthalate (PEN), where at least one outer layer comprises less than 0.1% by weight of PEN (based on the weight of this outer layer).
대표청구항▼
The invention claimed is: 1. An at least two-layered polyester film with a total thickness of from about 5 to about 200 μm which comprises a base layer and at least one polyethylene naphthahtte (PEN)-free outer layer, said film comprising, alongside polyethylene terephthalate, from anout 2 to
The invention claimed is: 1. An at least two-layered polyester film with a total thickness of from about 5 to about 200 μm which comprises a base layer and at least one polyethylene naphthahtte (PEN)-free outer layer, said film comprising, alongside polyethylene terephthalate, from anout 2 to about 20% by weight--based of on the weight of the entire film--of PEN, wherein (i) said base layer comprises PEN and (ii) at least one PEN-free outer layer comprises less than 0.1% by weight of PEN (based on the weight of this outer layer), and the polyethylene naphthalate content in each layer does not exceed 25% by weight, said films having a transmittance at 330 nm of less than 25%, said PEN-free outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable flim that lacks said PEN-free outer layer, wherein said film exhibits an oxygen barrier of less than 110 {cm3/(m2 d bar)}쨌{film thickness [μm]/12 [μm ]}in the absence of an additional barrier layer and said film contains no additional UV absorber. 2. The film as claimed in claim 1, wherein said film has a melting peak at from about 230 to about 270째 C. and diethylene glycol content of less than 3% by weight, said film exhibits an oxygen barrier of less than 100 {cm3/(m2 d bar)}쨌{film thickness [μm]/12 [μm]}in the absence of an additional barrier layer and said film is co-extruded. 3. The film as claimed in claim 1, wherein the concentration of polyetylene napthalate is at least 5% by weight (based on the weight of the entire film), said film exhibits an oxygen barrier of less than 100 {cm3/(m2 d bar)}쨌{film thickness [μm]/12[μm ]} in the absence of an additional barrier layer and said film is co-extruded. 4. The film as claimed in claim 1, which comprises from about 0.5 to about 2.5% by weight of isophthalic acid (IPA) (based on the weight of the entire film), said film exhibiting a 2 to 5% lower oxygen barrier than provided by a comparable film without IPA. 5. The film as claimed in claim 1, which is composed of a polyethylene-naphthalate-containing base layer (B) and of an outer layer (A) with less than 0.1% by weight of PEN. 6. The film as claimed in claim 1, which is composed of a polyethylene-naphthalate-containing base layer (B) and of an outer layer (A) with less than 0.1% by weight of PEN, and of another outer layer (C) on that side of the base layer opposite to (A). 7. The film as claimed in claim 6, wherein the outer layer (C) has an additional functionality. 8. A process for producing a film as claimed in claim 1, where the melts corresponding to the individual layers of the film are coextruded through a flat-film die, the resultant prefilm is drawn off for solidification on one or more rolls, the perfilm is then biaxially stretched, and the biaxially stretched film is heat-set. 9. A packaging composite made from a film as claimed in claim 1 and from another film. 10. The packaging composite as claimed in claim 9, wherein the other film is a polyester film, polyamide film, polyethylene film, or polypropylene film. 11. An at least two-layered polyester film according to claim 1 said film comprising from 8 to about 20% by weight--based on the weight of the entire film--of PEN and exhibiting an oxygen barrier of less than 100 {cm3/(m2 d bar)}쨌{film thickness [μm]/12 [μm]}in the absence of an additional barrier layer. 12. An at least two-layered polyester film with a total thickness of from about 5 to about 200 μm which comprises, alongside polyethylene terephthalate, from about 5 to about 20% by weight--based on the weight of the entire film--of polyethylene naphthalate (PEN), wherein at least on PEN-free outer layer comprises less than 0.1% by weight of PEN (based on the weight of this outer layer), and the polyethylene naphthalate content in each layer does not exceed 25% by weight, said films having a transmittance at 330 nm of less than 25%, which is composed of a polyethylene-naphthalate-containing base layer (B) and two outer layers (A) and (A), or (A) and (A'), each with less than 0.1% by weight of PEN, said PEN-free outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable film that lacks said PEN-free outer layer, wherein said PEN-free outer layer reduces said blue fluorescence in the absence of an additional UV absorber. 13. Method of absorbing UV radiation in a multilayer pakaging composite, which method comprises incorporating an at least two-layered polyester film with a total thickness of from about 5 to about 200 μm within said composite, said film including at least one outer layer and base layer, wherein at least one of said outer layers is a polyethylene naphthalate (PEN)-free layer comprising less than 0.1% by weight of polyethylene naphthalate and said base layer comprising from 5 to 25% by weight of polyethylene naphthalate, said film having a transmittance at 330 nm of less than 25% and said PEN-free outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable film that lacks said PEN-free outer layer, wherein said PEN-free outer layer reduces said blue fluorescence in the absence of an additional UV absorber. 14. An at least two-layered polyester film comprising a first and second layer, said first layer an outermost surface of said film, said first layer, a polyethylene naphthalate (PEN)-free layer, comprising less than 1.0% by weight of polyethylene, based on the weight of the layer, said second layer comprising from 3 to 8% by weight of polyethylene naphthalate, based on the weight of the layer, said film having a thickness ranging from 50 to 200 microns and exhibiting a transmittance at 330 nm of less than 25%, said PEN-free outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable film that lacks said PEN-free outer layer in the absence of an additional UV absorber. 15. An at least two-layered polyester film comprising a first and second layer, said first layer forming an outermost surface of said film, said first layer, a polyethylene naphthalate (PEN)-free layer, comprising less than 0.1% by weight of polyethylene naphthalate, based on the weight of the layer, said second layer comprising from 5 to 16% by weight of polyethylene naphthalate, based on the weight of the layer, said film having a thickness ranging from 8 to 24 microns and exhibiting a transmittance at 330 nm of less than 25% in the absence of an additional UV absorber, said PEN-free outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable film that lacks said PEN-free outer layer. 16. An at least two-layered polyester film comprising a first and second layer, said first layer forming an outermost surface of said film, said first layer, a polyethylene naphthalate (PEN)-free layer, comprising less than 0.1% by weight of polyethylene naphthalare, said second layer comprising from 5 to 25% by weight of polyethylene naphthalate along with polyester comprising from 0.5 to 2.5% by weight isophthalic acid, said film exhibiting a trasmittance at 330 nm of less than 25% in the absence of an additional UV absorber, said PEN-free Outer layer reducing the blue fluorescence exhibited by said film in ultraviolet light in comparison to a comparable film that lacks said PEN-free outer layer.
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