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AssigneeMitsubishi Polyester Film GmbH
InventorsUrsula Murschall, Ulrich Kern, Thorsten Kiehne, Harald Hessberger
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The invention relates to transparent, biaxially oriented and heat-set films having one or more layers and compris, as main constituent, at least one crystallizable thermoplastic, in particular a polyester, and also comprise at least one hydrolysis stabilizer. The hydrolysis stabilizer is preferably a phenolic compound, an oxazoline, and/or a monomeric or polymeric carbodiimide, where appropriate combined with an organic phosphite. It is preferably added in the form of a masterbatch. The film exhibits low longitudinal and transverse shrinkage. On exposure to moisture and heat it shows practically no embrittlement and retains its ultimate tensile strength. The additional functionality is preferably that the film has been made UV-resistant, or flame-retardant, or on one side or on both sides has been coated, or is sealable, and/or has been corona- or flame-treated. The film is generally produced by extrusion or coextrusion, the hydrolysis stabilizer being added in the form of a predried or precrystallized masterbatch.
A transparent, biaxially oriented and heat-set film having one or more layers and comprising, as main constituent, at least one crystallizable thermoplastic, said at least one crystallizable thermoplastic being a polyester or copolyester selected from the group consisting of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), bibenzoyl-modified polyethylene terephthalate (PETBB), bibenzoyl-modified polybutylene terephthalate (PBTBB), wherein in the preparation of said polyester or copolyester use may also be made of isophthalic acid, cis-1,4-cyclohexane-dimethanol (c-CHDM), trans-1,4-cyclohexane-dimethanol (t-CHDM), or a mixture of cis-1,4-cyclohexane-dimethanol and trans-1,4-cyclohexane-dimethanol (c/t-CHDM),
A transparent, biaxially oriented and heat-set film having one or more layers and comprising, as main constituent, at least one crystallizable thermoplastic, said at least one crystallizable thermoplastic being a polyester or copolyester selected from the group consisting of polyethylene terephthlate (PET), polybutylene terephthalate (PBT), bibenzoyl-modified polyethylene terephthalate (PETBB), bibenzoyl-modified polybutylene terephthalate (PBTBB), and bibenzoyl-modified polyethlene napthalate (PENBB), wherein in the preparation of said polyester or copolyester use may also be made of isophthalic acid, cis-1,4-cylcohexane-dimethanol (c-CHDM), trans-1,4-cyclohexane-dimethanol (t-CHDM), or a mixture of cis-1,4-cyclohexane-dimethanol and trans-1,4-cyclohexane-dimethanol (c/t-CHDM), wherein the film comprises as a further hydrolysis a phenolic compound, wherein the hydrolysis stabilizer is a mixture made from 0.1 to 5% by weight of polymeric aromatic carbodiimides and 0.1 to 5% by weight of a blend made from 30 to 90% by weight of an organic phosphite and 70 to 10% by weight of a hydroxyphenyl propionate.
A transparent, biaxially oriented and heat-set film having one or more layers and comprising, as main constituent, at least one crystallizable thermoplastic, wherein the film comprises a hydrolysis stabilizer composition consisting essentially of (i) at least one phenolic compound to retard the hydrolysis of ester bonds and (ii) at least one compound selected from either monomeric carbodIImides, polymeric carbodiimides or oxazolines to restore bonds previously broken by hydrolysis.
A transparent, biaxially oriented and heat-set film having one or more layers and comprising as main constituent, at least one crystallizable thermoplastic, wherein the film comprises a hydrolysis stabilizer composition consisting of (i) at least one phenolic compound to retard the hydrolysis of ester bonds and (ii) at least one compound selected from either monomeric carbodIImides, polymeric carbodiimides or oxazolines to restore bonds previously broken by hydrolysis, wherein maid hydrolysis stabilizer composition is supplied as at least one of either a (i) precrystallized or (ii) predried masterbatch, said film thus further comprising carrier polymer that has been at least one of either (i) precrystallized or (ii) predried.
A transparent, biaxially oriented and heat-set film having one or more layers and comprising, as main constituent, at least one crystallizable thermoplastic, wherein the film comprises a hydrolysis stabilizer composition consisting of (i) at least one phenolic compound to retard the hydrolysis of ester bonds, (ii) at least one organic phosphite to degrade peroxides and (iii) at least one compound selected from either monomeric carbodIImides, polymeric carbodiimides or oxazoline to restore bonds previously broken by hydrolysis.
Dependencies are inferred from the claim text.