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1. EP1806380 - BIAXIALLY ORIENTED POLYESTER FILMS

Office
European Patent Office
Application Number 05770379
Application Date 09.08.2005
Publication Number 1806380
Publication Date 11.07.2007
Publication Kind A4
IPC
C08J 5/18
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H142
5Manufacture of articles or shaped materials containing macromolecular substances
18Manufacture of films or sheets
B32B 27/36
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27Layered products essentially comprising synthetic resin
36comprising polyesters
CPC
B32B 27/36
BPERFORMING OPERATIONS; TRANSPORTING
32LAYERED PRODUCTS
BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27Layered products comprising ; a layer of; synthetic resin
36comprising polyesters
C08J 5/18
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
5Manufacture of articles or shaped materials containing macromolecular substances
18Manufacture of films or sheets
C08J 2367/02
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G
2367Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain
02Polyesters derived from dicarboxylic acids and dihydroxy compounds;
B29K 2995/0081
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2995Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
0037Other properties
0081Tear strength
B29K 2067/003
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2067Use of polyesters ; or derivatives thereof; , as moulding material
003PET, i.e. poylethylene terephthalate
B29K 2067/006
BPERFORMING OPERATIONS; TRANSPORTING
29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR ; MOULDS, ; REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
2067Use of polyesters ; or derivatives thereof; , as moulding material
006PBT, i.e. polybutylene terephthalate
Applicants MITSUBISHI POLYESTER FILM CORP
Inventors SUZUKI TAKASHI
Designated States
Title
(DE) BIAXIAL ORIENTIERTE POLYESTERFOLIE
(EN) BIAXIALLY ORIENTED POLYESTER FILMS
(FR) FILMS DE POLYESTER À ORIENTATION BI-AXIALE
Abstract
(EN) The present invention relates to (1) a biaxially stretched polyester film comprising a polyester layer (layer A) which comprises butylene terephthalate units and has a melting point of not higher than 240°C, said biaxially stretched polyester film satisfying such properties that an edge tear resistance in longitudinal direction is smaller than an edge tear resistance in width direction and the edge tear resistances in each of longitudinal and width directions are not more than 40N; (2) a biaxially stretched polyester film having a crystallization temperature (Tc) of not lower than 125°C and edge tear resistances of not more than 80N in each of longitudinal and width directions; and (3) a biaxially stretched polyester film comprising a polyester layer (layer A) comprising butylene terephthalate units and polyester layers (layer B) which are laminated on the both surfaces of the layer A and has a melting point higher 10°C or more, than the melting point of the layer A, said biaxially stretched polyester film satisfying such properties that edge tear resistances in each of longitudinal and width directions are not more than 80N and the tensile break elongation is not more than 50%. The said biaxially stretched polyester films are excellent in film-forming stability, can be suitably used as packaging materials instead of the presently used packaging materials such as the cellophane, moisture-proof cellophane and K-coat cellophane, can be used even though having a laminate structure of only a base film and a sealant layer, and also can exhibits a good hand cut-off property.
(FR) Film polyester à orientation biaxiale portant une couche (A) de polyester comprenant des unités de butylène téréphtalate et ayant un point de fusion égal ou inférieur à 240°C, ledit film ayant une résistance au déchirement en longueur inférieure à sa résistance au déchirement en largueur et des résistances au déchirement en longueur et en largeur sont chacune égales ou inférieures à 40 N ; film polyester à orientation biaxiale ayant une température de cristallisation (Tc) supérieure ou égale à 125°C et dont les résistances au déchirement en longueur et en largeur sont chacune égales ou inférieures à 80 N ; et film polyester à orientation biaxiale qui est un stratifié obtenu en enserrant la couche (A) entre les deux films (B) formés d’un polyester ayant un point de fusion supérieur à celui du polyester de la couche (A) par au moins 10°C et les unissant, le film ayant des résistances au déchirement en longueur et en largeur égales ou inférieures à 80 N chacun et un allongement à la rupture égal ou inférieur à 50 %. Ces films polyesters à orientation biaxiale ont une excellente stabilité de formation de film et démontrent de si bonnes propriétés de découpage manuel (déchirabilité) qu’un usage pratique n’est possible qu’à l’aide d’un laminage avec couche adhésive uniquement, et sont donc utiles comme substituts de matériaux d’emballage actuels y compris le cellophane, le cellophane étanche et le cellophane K-coat.
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