Biaxially oriented hydrolysis-stable polyester film comprising epoxidized fatty acid derivatives and a chain extender, and process for production thereof and use thereof
AssigneeMitsubishi Polyester Film GmbH
InventorsHolger Kliesch, Bodo Kuhmann, Thomas Hackl, Dagmar Klein, Ingo Fischer, Annegrete Bursch
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Abstract
The invention relates to biaxially oriented polyester films which contain 0.25-20% by weight (based on the weight of the film) of a hydrolysis stabilizer based on epoxidized fatty acid esters and/or epoxidized fatty acid glycerides, and a chain extender. Such films find use in outdoor applications, as a ribbon cable, as a backside laminate of solar modules and in electrical insulation applications.
Claims16
A biaxially oriented polyester film comprising (i) polyester, (ii) 0.25-6% by weight, based on the weight of the film, of hydrolysis stabilizer based on epoxidized fatty acid esters and/or epoxidized fatty acid glycerides, and (ii) a chain extender having a polymer of formula 5
- where
- R9-R13 are each independently H or a C1-C12-alkyl radical,
- R14 is a C1-C12-alkyl group,
- x and y are each independently selected from 0 to 100,
- x+y is greater than 0 and
- z is from 2 to 100;
- wherein the sum of the hydrolysis stabilizer and the chain extender ranges from at least 1% by weight to less than 12% by weight, based on the weight of the film;
- and wherein more than 80% by weight of the epoxidized fatty acid glycerides are mixtures of glyceryl esters of the formula 1:
- CH2OR1—CHOR2—CH2OR3
- where the R1, R2 and R3 radicals are each independently defined as follows
- where RE=CH3 or H and
- m=1-40
- n=0-10
- o=0-4
- and where the sequence of the individual methylene (CH2)— (1), epoxy (CHOCH)— (2) and (CHCH3)— (3) groups is independently selected,
- and where R1,2,3 radicals where m=0 are present in glyceryl ester mixtures to an extent of less than 30% by weight, based on the total weight of the glyceryl esters,
- and where at least one said glyceryl ester includes at least one epoxidized fatty acid moiety;
- and wherein the film exhibits a modulus of elasticity in both directions of greater then 3000 N/mm2;
- and wherein the film has standard viscosity (SV) of more than 500 after 96 hours in an autoclave with steam saturation at 110° C.;
- and wherein the hydrolysis stabilizer is a mixture of epoxidized fatty acid esters and epoxidized fatty acid glycerides and the proportion of the fatty acid glycerides described by formula 1 in the overall hydrolysis stabilizer content is >50% by weight.
A biaxially oriented polyester film comprising (i) a polyester, (ii) a hydrolysis stabilizer based on epoxidized fatty acid esters and/or epoxidized fatty acid glycerides, and (iii) from 0.1 to less than 1.2% by weight of a chain extender, based on the weight of the film;
- wherein the sum of the hydrolysis stabilizer and the chain extender ranges from at least 1% by weight to less than 12% by weight, based on the weight on the weight of the film;
- and wherein the chain extender consist of a polymer of the formula 5
- where
- R9-R13 are each independently H or a C1-C12-alkyl radical,
- R14 is a C1-C12-alkyl group,
- x and y are each independently selected from 0 to 100,
- x+y is greater than 0 and
- z is from 2 to 100;
- and wherein the film exhibits a modulus of elasticity in both directions of greater than 4000 N/mm2 and said film has a hydrolysis rate that is not higher than sad film without said chain extender;
- and wherein the film includes more than 80% by weight of the epoxidized fatty acid glycerides that are mixtures of glyceryl esters of the formula 1:
- CH2OR1—CHOR2—CH2OR3
- where the R1, R2 and R3 radicals are each independently defined as follows
- where
- RE=CH3 or H and
- m=1-40
- n=0-10
- o=0-4
- and where the sequence of the individual methylene (CH2)— (1), epoxy (CHOCH)— (2) and (CHCH3)— (3) groups is independently selected,
- and where R1,2,3 radicals where m=0 are present in glyceryl ester mixtures are present to an extent of less than 30% by weight, based on the total weight of the glyceryl esters,
- said epoxidized fatty acid glycerides of the formula 1 are present in an amount greater than 50% by weight within the hydrolysis stabilizer,
- and where at least one said glyceryl ester includes at least one epoxidized fatty acid moiety;
- and wherein said film has an SV of more than 500 after 96 hours in an autoclave with steam saturation at 110° C.
Dependencies are inferred from the claim text.